IRS Audits & Data
IRS Corporate Audit Rate in 2026: The Real Numbers by Company Size, From the IRS Data Book
The short answer: the IRS corporate audit rate depends on size. For tax year 2021 the IRS Data Book shows 0.4% of corporate returns examined: 0.2% under $250,000 in assets, 1.1% at $10 million to $50 million, 35.9% over $20 billion. Its goal for corporations over $250 million: 22.6% in tax year 2026.
This guide covers the IRS corporate audit rate by asset size from the IRS's own Data Book, what the IRS closed in fiscal 2025, why the $10 million line changes everything, what triggers a small-corporation exam, whether the 2025 workforce cuts changed the odds, and what to do if an audit letter arrives.
Maybe you still run the small S corporation you built before retirement, or you just filed your company's first 1120 and a friend warned you that incorporating "puts a target on your back." You searched for the IRS corporate audit rate because you want a real number, not a rumor. Here it is: for a company your size, the odds are lower than almost anyone guesses, and the handful of things that raise them are specific and avoidable.
The image below shows how these audit rates compare at a glance, from the smallest 1120 filers to the corporations the IRS examines almost continuously, and it is worth a look before you worry about your own return.
⏱ Is there a clock? If you are only researching odds, no. If an audit letter has already arrived, the date printed on it controls everything: an exam report generally gives you 30 days from the date of the letter to protest to Appeals, and a Notice of Deficiency gives you 90 days from the date on the notice, not the date you receive it, to petition Tax Court (150 days if the notice is addressed to you outside the U.S., under IRC §6213). The IRS says that deadline cannot be extended.
The IRS corporate audit rate in 2026, by the numbers
The IRS examined 0.4% of corporate income tax returns for tax year 2021, the most recent year outside the normal three-year assessment statute, according to Table 3-1 of the FY2025 IRS Data Book. That table is the only official source for corporate audit rates, and it is worth reading carefully, because the headline number hides a hundredfold spread. Corporations with under $250,000 in assets were examined at 0.2%. Corporations with $20 billion or more were examined at 35.9%. For tax year 2019, the last fully pre-pandemic year, the spread was 0.2% against 49.2%.
The IRS reports these rates with a lag. The shaded recent years in its table keep rising as exams open inside the three-year window, so the 0.1% it shows for tax year 2023 is a floor, not a final number. Tax year 2021 is the fairest "current" rate because it is the newest year the IRS can no longer add exams to.
| Corporation size (total assets) | Tax year 2019 | Tax year 2021 | Who examines it |
|---|---|---|---|
| No balance sheet | 0.3% | 0.2% | Small Business/Self-Employed |
| $1 to $250,000 | 0.2% | 0.2% | Small Business/Self-Employed |
| $250,000 to $1 million | 0.5% | 0.5% | Small Business/Self-Employed |
| $1 million to $5 million | 0.5% | 0.5% | Small Business/Self-Employed |
| $5 million to $10 million | 0.9% | 0.6% | Small Business/Self-Employed |
| $10 million to $50 million | 1.7% | 1.1% | Large Business & International |
| $50 million to $100 million | 3.5% | 2.6% | Large Business & International |
| $100 million to $250 million | 4.1% | 3.5% | Large Business & International |
| $250 million to $500 million | 2.4% | 1.1% | Large Business & International |
| $500 million to $1 billion | 5.3% | 2.3% | Large Business & International |
| $1 billion to $5 billion | 10.3% | 5.7% | Large Business & International |
| $5 billion to $20 billion | 27.9% | 18.5% | Large Business & International |
| $20 billion or more | 49.2% | 35.9% | Large Business & International |
| All corporations except 1120-S | 0.5% | 0.4% | |
| S corporations (1120-S) | 0.1% | 0.1% | Small Business/Self-Employed |
| Partnerships (1065) | 0.1% | 0.1% | SB/SE or LB&I by size |
Two targets sit on top of those numbers. In May 2024 the IRS announced it would "nearly triple audit rates on large corporations with assets over $250 million to 22.6% in tax year 2026," up from 8.8% in 2019, raise coverage of partnerships over $10 million from 0.1% to 1%, and "not increase audit rates for small businesses and taxpayers making under $400,000." Then 2025 happened: the Treasury Inspector General's January 2026 snapshot found the IRS workforce down 28% net in a year, with roughly a third of revenue agents gone. The seasoned agents who run complex corporate exams were the hardest positions to lose. Whether the announced targets survive is an open question, but the automated selection systems that flag small-business returns kept running without interruption.
If you are comparing your business odds against your personal return, the pattern is the same on the individual side. Overall individual coverage for tax year 2021 was 0.3%, and it climbs steeply with income, as our breakdown of the IRS audit rate by income shows. The partnership side has its own regime, covered in our IRS partnership audit rate guide.
“Selection for an audit does not always suggest there's a problem. The IRS uses several different selection methods: Random selection and computer screening - sometimes returns are selected based solely on a statistical formula.”
— IRS audits (IRS.gov)
What corporate audits did the IRS close in fiscal 2025?
The IRS closed 7,495 corporate income tax examinations in fiscal year 2025 and recommended $12.0 billion in additional tax from them, according to Table 3-2 of the Data Book. That is 1.5% of the 497,621 audits the agency closed that year and 45% of the $26.8 billion it recommended across all of them. Almost all of the corporate dollars came from the top: the 281 closed exams of corporations with $20 billion or more in assets produced $8.6 billion.
| Corporation size (total assets) | Exams closed | Recommended additional tax |
|---|---|---|
| No balance sheet | 915 | $195 million |
| $1 to $250,000 | 1,411 | $82 million |
| $250,000 to $1 million | 1,010 | $65 million |
| $1 million to $5 million | 572 | $56 million |
| $5 million to $10 million | 263 | $24 million |
| $10 million to $50 million | 841 | $891 million |
| $50 million to $250 million | 991 | $84 million |
| $250 million to $5 billion | 811 | $607 million |
| $5 billion to $20 billion | 316 | $1.33 billion |
| $20 billion or more | 281 | $8.59 billion |
| All corporations except 1120-S | 7,495 | $11.99 billion |
Read the small-corporation rows for what they are. The IRS closed 1,411 exams of corporations with under $250,000 in assets and recommended an average of about $58,000 of additional tax each. Those are not random spot checks. They are returns an algorithm scored as worth a revenue agent's time, which brings us to how selection works.
Why does company size decide your audit odds?
The IRS splits corporate exams between two divisions at a hard line: $10 million in assets. Below it, your return sits with the Small Business/Self-Employed division alongside tens of millions of other filers. Above it, the Large Business and International division (LB&I) takes over with teams built for complex, multi-year field exams, and the Data Book shows coverage jumping from 0.6% just below the line to 1.1% just above it, then compounding with every size band.
The economics drive everything. A single $20 billion-plus exam recovered an average of more than $30 million in fiscal 2025; a small 1120 exam recovered a few tens of thousands. When headcount is scarce, and after 2025 it is scarcer than at any point in decades, the IRS spends its human hours upmarket and lets computers police the rest.
That is why "the rest" matters to you. Small-corporation returns are scored by the Discriminant Inventory Function (DIF) system, which compares every line of your return against statistical norms for businesses like yours. High-scoring returns get pulled for human review. The IRS's own audit page says selection is sometimes "based solely on a statistical formula." Nobody at the IRS decided to look at you. An algorithm did, which means your real audit risk is not the published rate. It is how far your return sits from normal.
What triggers a small-corporation audit?
Most corporate audit selections come from math, not suspicion. Mismatched information returns and statistical outliers account for the bulk of small-business exams, and the IRS adds a second route: returns that "involve issues or transactions with other taxpayers" already under audit. The specific patterns that raise a small corporation's score include:
- Gross receipts below your paper trail. The IRS matches your 1120 or 1120-S against 1099-K and 1099-NEC filings under your EIN. Reporting less than the forms show is the closest thing to an automatic flag. The scale of that matching program is in our CP2000 underreporter statistics.
- Officer compensation at the extremes. An S corp owner taking a token salary while pulling large distributions (avoiding payroll tax), or a C corp paying an outsized salary to strip out profit. Both are classic exam issues.
- Recurring losses. A corporation that loses money year after year while the owner keeps living invites the question of where the money comes from.
- Related-party transactions. Shareholder loans with no notes or repayment, rent paid to yourself at odd rates, family on payroll with no duties.
- Balance sheets that do not reconcile. Schedule L figures that jump between years without explanation are a quiet but potent scoring factor.
- Heavy cash. Restaurants, salons, contractors, and other cash-intensive operations face structurally higher scrutiny, because the exam can reconstruct income from deposits and lifestyle rather than from your books.
If any of those describe your last return, the fix is documentation, not restructuring. Our IRS audit document checklist lists what an examiner asks for first.
Did the 2025 IRS layoffs lower corporate audit rates?
The workforce reduction was real and it hit examiners hardest. TIGTA counts 31,273 departures between January 2025 and January 2026, about 30% of the workforce, or 28% net of roughly 2,000 rehires, and it reports that approximately 33% of revenue agents and 32% of tax examiners left. Complex corporate field exams almost certainly declined with them. Experienced revenue agents take years to train, and the enforcement plan that promised 22.6% large-corporate coverage was written for an agency that no longer exists in that form.
Here is the part that matters for a small corporation: your audit risk was never driven by people. Document matching, DIF scoring, automated underreporter notices, and computer-generated exam letters run regardless of headcount. And the three-year assessment statute means a return filed today can be selected in 2027 or 2028, by whatever IRS exists then. Filing aggressively because the agency looks weakened is a bet with a multi-year tail. We walk through why in IRS layoffs: will I still get audited, and the agency-wide enforcement numbers are in our FY2025 audit and enforcement statistics.
What happens if you ignore a corporate audit letter?
An ignored audit does not go away. It defaults, and a defaulted audit means the IRS's numbers become your bill. The sequence runs in a fixed order, and each stage closes a door the previous one held open:
- Opening letter. The IRS says it notifies you of an audit by mail. The letter names the years and issues and prints a response or appointment date. Silence here does not pause anything.
- Exam report (the 30-day letter). With no response, the agent disallows the questioned items, often all of them, and proposes the tax, usually with the 20% accuracy-related penalty attached. You generally have 30 days from the date of the letter to protest to the IRS Independent Office of Appeals for free.
- Notice of Deficiency. Miss the protest window and the statutory notice arrives. The 90-day letter and Tax Court petition window is your last chance to dispute the tax before paying it, and the IRS says it cannot extend that deadline.
- Assessment and the first bill. No petition means the tax is assessed. Corporations get a CP161 balance-due notice; pass-through owners see the adjustment billed on their personal account. Failure-to-pay penalties and daily-compounding interest start here.
- Collection escalates. Unpaid bills move to an intent-to-levy notice (CP504B), then a final notice (CP297 or LT11) that offers a Collection Due Process hearing on Form 12153. After that, the IRS can levy bank accounts and receivables, and if the bill sits on your personal account, garnish wages or take 15% of Social Security benefits through the Federal Payment Levy Program.
Notice what the sequence costs: at stage 2 the dispute is free, at stage 3 it requires a court filing, and by stage 5 the argument is over and only payment terms remain.
Holding an audit letter or an exam report you disagree with?
The response date printed on it is the clock, and appeal rights expire with it. Send us the letter and an experienced tax professional will map exactly where you stand and what your strongest move is. Free, confidential, no pressure.
| Stage / notice | Response window | What you lose if it passes |
|---|---|---|
| Opening audit letter | Date printed on the letter | The chance to shape the exam; silence means every questioned item defaults against you |
| Exam report (30-day letter) | Generally 30 days from the date of the letter | Free review by the IRS Independent Office of Appeals without going to court |
| Notice of Deficiency (CP3219A) | 90 days (150 outside the U.S.); the IRS says it cannot be extended | The right to dispute the tax in Tax Court before paying it |
| Assessment + CP161 (or a personal balance-due notice for pass-through owners) | Pay-by date printed on the notice | Penalty-free payoff; failure-to-pay penalties and compounding interest accrue from here |
| CP504B (intent to levy) | Date printed on the notice | State tax refunds become levyable under IRC §6331(d); a federal tax lien can be filed |
| CP297 / LT11 (final notice) | 30 days to request a CDP hearing (IRC §6330) | Collection Due Process rights (Form 12153); after this, levies can issue |
Your options if the audit ends in a bill
An audit assessment is resolved the same way any IRS balance is. But the order matters, because appeal and abatement rights expire while payment options do not. Here is the full menu, with who qualifies:
| Option | Who qualifies | Cost and notes |
|---|---|---|
| Appeal (protest the 30-day letter) | Anyone, before assessment, within the window on the exam report | Free; a small case request on Form 12203 works when the proposed tax and penalty are $25,000 or less per period, though not for S corporations or partnerships. Appeals settles many cases on the hazards of litigation |
| Audit reconsideration | After assessment, if you have information the exam never considered | Free; no deadline, but collection continues while it is reviewed |
| Pay in full | Anyone | Stops the 0.5%-per-month failure-to-pay penalty and interest immediately |
| Guaranteed installment agreement | Individuals owing $10,000 or less (common when a pass-through adjustment lands on your 1040) | Paid within 3 years; approval is automatic if you are filing-compliant. Interest and penalties continue |
| Simple Payment Plan | Individuals owing $50,000 or less; businesses owing $25,000 or less with payroll taxes or $50,000 without | Up to 10 years for most taxpayers, no financial statement; $29 online with direct debit, $107 by phone. See the payment plan fee guide |
| Business payment plan over the limits | Operating corporations with larger balances | Financial statements required and often a revenue officer; our business IRS payment plan guide covers it |
| Penalty relief | Clean 3-year compliance history (first time penalty abatement) or reasonable cause | Free to request; removes penalties, not tax. The IRS is phasing in an Automatic Exemption from Penalty that applies during original return processing for eligible returns processed after it starts in summer 2026; 2025 returns processed before that still need a first-time abatement request. The 20% accuracy-related penalty is outside that program and is fought at Appeals |
| Currently Not Collectible | Income covers only necessary living expenses; common on fixed incomes | Free; pauses collection but the debt and interest remain |
| Offer in Compromise | Only when assets plus future income cannot cover the balance; rare for operating businesses | Application fee, waived with low-income certification; the IRS accepted 5,464 of the 38,797 offers it received in fiscal 2025. Never a quick fix |
The assessment statutes behind exam selection live in our hub on how far back the IRS can audit: generally 3 years, up to 6 for a substantial error, and no limit for fraud or unfiled returns. One exam-specific wrinkle: agents near the statute deadline often ask you to sign Form 872 extending it. Whether to sign is a real strategic decision. Refusing can force a rushed assessment; agreeing gives the IRS more runway.
A worked example: a $7,400 audit adjustment on a retiree's S corporation
Say you are retired, drawing Social Security, and you still run a small S corporation for part-time consulting. A correspondence exam disallows $29,600 of deductions (home office, vehicle, and travel with thin documentation), and at your roughly 25% combined marginal rate, the pass-through adjustment adds $7,400 in tax to your personal return. This is a hypothetical, but the math is how these cases run:
- The penalty question comes first. If the 20% accuracy related penalty applies, that is another $1,480, for $8,880 before interest. Documentation showing a reasonable basis for the deductions can knock the penalty out entirely at Appeals, which is why the 30-day window is worth more than any payment plan.
- If the tax stands and you cannot pay at once: $8,880 is under the $10,000 guaranteed installment agreement line. Spread over the maximum 36 months, that is about $247 a month before interest, call it roughly $260 once accrual is added. Estimate your own figures with our Penalty & Interest Calculator.
- If Social Security is most of your income: the IRS's own expense standards may show you cannot pay $260 a month without hardship. Currently Not Collectible status exists for exactly this. It also blocks the 15% Federal Payment Levy Program bite that unresolved balances can eventually trigger on benefit checks, which we cover under the CP91 Social Security levy notice.
Notice the ordering: fight the penalty first (a $1,480 swing), then pick the payment structure. Reversing that order forfeits money for nothing.
How to respond to a corporate audit letter, step by step
- Verify the letter is real. The IRS says it notifies you of an audit by mail, never by phone or email first. Confirm the exam exists through your IRS business or individual online account before sending anyone anything.
- Calendar the response date. The date printed on the letter controls every right you have from here. Write it down, then work backward, because gathering records always takes longer than expected.
- Pull only what was asked for. Organize records by the specific issues and years listed in the letter. Never volunteer extra years, extra accounts, or extra explanations. You can expand an audit by accident.
- Decide on the statute before signing anything. If the agent asks you to sign Form 872 extending the assessment deadline, get advice first. Extending can buy goodwill or give the IRS more time, and the right answer depends on your facts.
- Respond in writing by the deadline. Send organized documentation with a short cover letter, keep copies of everything, and use certified mail. If you disagree with an exam report, file a protest within the 30-day window instead of letting it default.
When can you handle this yourself, and when does help change the outcome?
Many corporate audits are self-manageable. If yours is a single-issue correspondence exam, your records are clean, and the questioned amount is small, an organized response by the printed date usually closes it. The same goes for a proposed adjustment you agree with and can pay, or a straightforward payment plan on a balance under the Simple Payment Plan limits. None of that requires paying anyone. Our guide to what to expect in an IRS mail audit walks through the correspondence version.
Experienced help earns its cost in specific situations: a field exam at your place of business (where agents interview you and tour the operation), multiple years or multiple entities under exam at once, a cash-intensive business facing income reconstruction, any hint of criminal exposure underneath the civil exam, disputed penalties worth four figures or more, and every deadline-driven stage, the 30-day protest and the 90-day Tax Court window, where a missed date is unrecoverable. In those cases, representation is about controlling scope, sequencing the penalty fight before the payment talk, and never letting a right expire by accident.
If a field audit or a multi-year exam is what you are facing, it costs nothing to have an experienced tax professional at Clarity Tax Relief look at the letter first. Request a free review or call (888) 825-7779.
Terms in corporate audit statistics and letters, decoded
- Percentage covered: the Data Book's audit rate. Returns examined (closed plus in process) divided by returns filed for that tax year. It rises for recent years as exams open.
- DIF score: the computer score the IRS assigns every return, measuring how far it deviates from statistical norms. High scores drive most small-business exam selections.
- LB&I: the Large Business and International division, which examines corporations with $10 million or more in assets. Smaller companies fall under the Small Business/Self-Employed division.
- 30-day letter: the exam report proposing changes. The 30 days is your window to protest to the IRS Independent Office of Appeals for free.
- Notice of Deficiency: the "90-day letter" (CP3219A) that legally proposes the tax. Petitioning Tax Court within 90 days is the only way to dispute it before paying.
- Form 872: the consent that extends the IRS's assessment deadline; agents request it when an exam runs close to the 3-year statute.
- CAP: the Compliance Assurance Process, a pre-filing program where the largest corporations resolve issues with the IRS before the return is filed.
IRS corporate audit rate questions, answered
What is the current IRS corporate audit rate?
For most corporations, well under 1%. The FY2025 IRS Data Book shows 0.4% of corporate income tax returns (excluding S corporations) for tax year 2021 were examined, and 0.2% of corporations with under $250,000 in assets. The exception is size: 18.5% of corporations with $5 billion to $20 billion in assets and 35.9% of those over $20 billion were examined for the same year. The IRS set a 22.6% target for corporations over $250 million for tax year 2026.
What percentage of small businesses get audited?
A fraction of 1% in a typical recent year, whatever the entity. The Data Book shows 0.1% of S corporation returns and 0.1% of partnership returns for tax year 2021 were examined, and 0.2% of C corporations with under $250,000 in assets. Sole proprietors filing Schedule C are counted on the individual side, where overall coverage was 0.3%. Low odds are not zero odds: returns with mismatched 1099s, recurring losses, or outlier deductions are selected far more often than the averages suggest.
Are S corporations audited more than C corporations?
No. S corporations have been among the least-audited return types, with the Data Book showing 0.1% coverage for tax year 2021 against 0.4% for other corporations. The catch is that S corporation adjustments flow through to shareholders, so an 1120-S exam usually ends as a bill on your personal 1040. The IRS also watches specific S corp issues closely, especially owners who take an unreasonably low salary to avoid payroll tax.
Did the 2025 IRS layoffs reduce corporate audit rates?
They almost certainly reduced complex field exams. The Treasury Inspector General reports the IRS workforce fell 28% net between January 2025 and January 2026, with about 33% of revenue agents gone, and the IRS closed 7,495 corporate exams in fiscal 2025. But small-corporation audits lean on automation: document matching, DIF scoring, and computer-generated notices never stopped. Filing aggressively because you expect the IRS to be too short-staffed to notice is a bet against software, not people, and the assessment statute gives the IRS years to catch up.
How far back can the IRS audit a corporation?
Generally three years from the date the return was filed. The IRS says it may add years if it identifies a substantial error, and that it usually does not go back more than six. There is no time limit at all for a fraudulent return or a year with no return filed. During an exam, agents often ask you to sign Form 872 to extend the statute. Get advice before signing, because that decision changes your position.
What triggers an IRS audit of a small corporation?
Most selections are math, not humans. The IRS says some returns are selected based solely on a statistical formula and others because they involve transactions with taxpayers already under audit. The patterns that raise a small corporation's score include gross receipts that do not match 1099-K and 1099 filings, officer compensation at the extremes (too low on an S corp, suspiciously high on a C corp), recurring losses, related-party loans that look like disguised distributions, and Schedule L balance sheets that do not reconcile from one year to the next.
Will a corporate audit affect my personal taxes?
If the company is an S corporation or partnership, almost always. Adjustments pass through to the owners' individual returns, so the final bill lands on your 1040. A C corporation's tax is its own, but exams frequently spill over into the owner's return through officer compensation, constructive dividends, or personal use of company assets. Expect the agent to look at both returns when one owner controls the company.
What happens if a corporate audit ends with tax due?
You get an exam report first, with generally 30 days from the date of the letter to accept it or protest to the IRS Independent Office of Appeals, a free review that resolves many cases. If you do not respond, a Notice of Deficiency starts a 90-day window to petition Tax Court before the tax is assessed, and the IRS says that deadline cannot be extended. After assessment, collection notices begin, and your options shift to payment plans, penalty relief, hardship status, or, in narrow cases, an Offer in Compromise.
Does incorporating lower my audit risk?
The published numbers say small corporations and S corporations are examined less often than individuals as a whole, so the odds do tend to drop. But incorporating solely to dodge audits is a bad trade: you take on payroll filings, reasonable-salary rules, and corporate formalities that create their own exam issues if handled sloppily. Choose your entity for business reasons and keep clean records. That combination lowers risk more than any structure.
Your next 24 hours
- Check what you are holding. If an IRS letter arrived, find the letter number in the top corner and the response date printed on it. Those two facts determine everything. If you are only researching, pull your last three corporate returns and note anything an algorithm would flag: recurring losses, big year-over-year swings, round-number deductions.
- Gather the paper. The audited-year return (or your most recent one), business bank statements, and the records behind your largest deduction categories. Organized records are the difference between a closed exam and an expanded one.
- Get a free case review. If a letter has a date on it, that printed deadline is the real clock. If not, the only thing accruing is risk on a return you can still tighten up. Either way, an experienced tax professional can tell you in one call whether you have a problem. Start with the 2-minute form or call (888) 825-7779.
Primary sources: the audit rates above are from Table 3-1 and the fiscal 2025 closures from Table 3-2 of the IRS Data Book (the Table 3-1 download has every year back to 2010); the 22.6% target is in IRS release IR-2024-130; the workforce figures are from TIGTA's January 2026 workforce snapshot; selection methods and the lookback period are on the IRS's audits page; and payment options for any resulting balance are at IRS.gov/payments. If an exam or collection action is causing hardship the IRS will not address, the independent Taxpayer Advocate Service can intervene.
This guide is general information, not tax or legal advice for your specific situation. Eligibility for IRS programs depends on individual facts and circumstances; no outcome is guaranteed.
Read the transcript
Host: So you've either got an IRS letter on the table with your company's name on it, or you just filed your first 1120 and somebody told you incorporating puts a target on your back. Either way, you want a real number. B, what's the real number?
Tax specialist: Depends almost entirely on size, and the spread is huge. Small C corporations, assets under ten million dollars, have been examined at well under one percent in recent years. Same story for S corps filing the 1120-S. Well under one percent, historically.
Host: And the big ones?
Tax specialist: The IRS announced a 22.6 percent audit-rate target for corporations with assets over two hundred fifty million, for tax year 2026. That came out of their 2024 enforcement plan.
Host: 22.6 versus under one percent. That's — hold on, that's like a hundred times.
Tax specialist: Roughly a hundredfold, yeah. And that gap is the single most important fact here. The IRS puts its people where the dollars are.
Host: Okay, so what's the ten million dollar line about? You said assets under ten million.
Tax specialist: It's a jurisdiction line. Below ten million in assets, your return sits with the Small Business/Self-Employed division. Above it, LB&I takes over, Large Business and International, and those are field exams, teams, multiple years. Below the line, exams are usually narrow, single-issue, and often handled by mail.
Host: Now, I want to ask about 2025, because people heard the IRS lost a lot of staff.
Tax specialist: Roughly twenty-seven percent of the workforce. And experienced revenue agents, the ones who run complex corporate exams, those are among the hardest jobs to replace. So the honest read is that complex field exams almost certainly declined. Whether that 22.6 percent target survives is an open question.
Host: Then the small guy's off the hook, right?
Tax specialist: No. And this is the part people miss. Your audit risk was never driven by people. Document matching, automated underreporter notices, computer-generated exam letters — all of that kept running without interruption.
Host: Say more about how a small return actually gets picked.
Tax specialist: There's a score called DIF — Discriminant Inventory Function. Every return gets one. It compares each line against statistical norms for businesses like yours, and the high scorers get pulled for a human to look at. Nobody at the IRS decided to look at you. An algorithm did. Which means the published rate isn't your real risk. Your real risk is how far your return sits from normal.
Host: So what pushes you away from normal? Give me the list.
Tax specialist: Gross receipts below your paper trail — the IRS matches your 1120 or 1120-S against 1099-K and 1099-NEC filings under your EIN. Reporting less than the forms show is about the surest way to get flagged. Then officer compensation at the extremes: an S corp owner taking a token salary while pulling big distributions, or a C corp paying an outsized salary to strip out profit. Recurring losses year after year while the owner keeps living. Related-party stuff — shareholder loans with no note, rent paid to yourself at odd rates, family on payroll with no duties. Balance sheets that don't reconcile, Schedule L figures jumping between years with no explanation. And cash-heavy operations get structurally more scrutiny at every size.
Host: Wait, back up on Schedule L. That's a quiet one?
Tax specialist: Quiet but potent. Nobody thinks of the balance sheet as an audit trigger. The scoring system does.
Host: Alright. Let's talk about the person holding a letter, because that's who's most anxious. What happens if they just... don't answer it?
Tax specialist: It doesn't go away. It defaults. And a defaulted audit means the IRS's numbers become your bill. The sequence runs in a fixed order and every stage closes a door the one before it held open.
Host: Walk me through the doors.
Tax specialist: Opening letter — Letter 566 or 2205-A. Names the years and issues, prints a date. Silence doesn't pause anything. Then the exam report, Letter 915 or 950, sometimes called the thirty-day letter. If you never responded, the agent disallows the questioned items, often all of them, proposes the tax, usually with a twenty percent accuracy-related penalty attached. That's your window to protest to IRS Appeals, and that review costs nothing.
Host: Thirty days on the 915 or 950. Got it. Then?
Tax specialist: Notice of Deficiency. The ninety-day letter — CP3219A or Letter 531. Ninety days from the date printed on the notice, not the date you pull it out of the mailbox. A hundred fifty if it's addressed to you outside the U.S. That's a statutory clock. It can't be extended.
Host: Ninety from the date on the notice. That distinction has burned people.
Tax specialist: It has. After that, no petition means the tax gets assessed. Corporations see a CP161. If you're a pass-through owner, the adjustment lands on your personal account, often a CP22E. Failure-to-pay penalties and daily compounding interest start there. Then collection escalates — CP504B for businesses, intent to levy, and then a final notice, CP297 or LT11, which starts a thirty-day Collection Due Process clock. Form 12153 requests that hearing before levies can issue.
Host: Form 12153. And after those thirty days?
Tax specialist: Levies can go out. Bank accounts, receivables. And if the balance is sitting on your personal account, wages, or up to fifteen percent of Social Security benefits through the Federal Payment Levy Program.
Host: Okay, hm. So the cost of waiting isn't money, it's —
Tax specialist: It's rights. At the exam report stage the dispute is free. At the Notice of Deficiency stage it takes a court filing. By the final notice, the argument about the tax is over and you're only negotiating payment terms.
Host: The article runs a hypothetical I want you to do, because the ordering surprised me.
Tax specialist: Sure. Retired person, drawing Social Security, still runs a small S corporation for part-time consulting. Correspondence exam disallows twenty-nine thousand six hundred dollars of deductions — home office, vehicle, travel, all thin on documentation. At roughly a twenty-five percent combined marginal rate, that's seventy-four hundred dollars of tax flowing through to the personal 1040.
Host: Plus the penalty.
Tax specialist: If the twenty percent accuracy-related penalty applies, another fourteen eighty. Total eighty-eight eighty before interest. So the penalty question comes first — documentation showing a reasonable basis for those deductions is what you'd put in front of Appeals inside that window. That's a fourteen-hundred-dollar swing you can't chase later.
Host: And then payment.
Tax specialist: Then payment. Eighty-eight eighty is under the ten thousand dollar line for what the IRS calls the Guaranteed Installment Agreement — that's the program's actual statutory name, IRC 6159(c). Individuals owing ten thousand or less, paid within three years, no financial disclosure if you're current on filings. Over thirty-six months that's about two hundred forty-seven a month before interest, call it two sixty with accrual. Interest and penalties keep running either way. There's also the streamlined agreement for individuals at fifty thousand or less, up to seventy-two months, set up online.
Host: And if two sixty a month isn't there? If it's mostly Social Security?
Tax specialist: Then Currently Not Collectible is the mechanism built for that — the IRS's own expense standards decide whether necessary living expenses eat your income. It pauses collection; the debt and the interest stay. It also blocks that fifteen percent bite on benefit checks while it's in place. Penalty abatement is a separate request — first-time abatement if you've got a clean three-year compliance history, or reasonable cause. That removes penalties, not tax. Offer in Compromise exists but it's narrow, it's for when assets plus future income genuinely can't cover the balance, and it's rare for an operating business. Two hundred five dollar fee, waived with low-income certification. Never a quick fix.
Host: One more — the agent asks you to sign Form 872. Extend the statute. Yes or no?
Tax specialist: Genuine strategic decision, and I won't pretend there's a default answer. Refusing can force a rushed assessment. Agreeing gives the IRS more runway. Get advice before you sign. Baseline is three years from filing, six if more than twenty-five percent of gross income was omitted, and no limit at all for fraud or an unfiled year.
Host: Say the hard part plainly. When is this a do-it-yourself thing?
Tax specialist: Single-issue correspondence exam, clean records, small amount — an organized response by the printed date is often all it takes, and you shouldn't pay anyone for that. Where help changes things is a field exam at your place of business, multiple years or entities at once, a cash-intensive business facing income reconstruction, any hint of criminal exposure under the civil exam, disputed penalties in the four figures, and every deadline-driven stage. Because a missed thirty-day or ninety-day date is unrecoverable. Nobody can un-miss it.
Host: So the next twenty-four hours.
Tax specialist: If you're holding a letter: find the letter number in the top corner and the response date. Those two facts determine everything. Verify it's real through your IRS online account before you send anyone anything. Then pull only what was asked for — the specific issues and years named. Don't volunteer extra years or extra accounts, you can widen an audit by accident. Respond in writing, certified mail, keep copies.
Host: And if there's no letter?
Tax specialist: Then nothing's ticking. Pull your last three returns and look at them the way an algorithm would — recurring losses, big year-over-year swings, round-number deductions, officer comp. That's a return you can still tighten up.
Host: And if you want a second set of eyes, send us the letter. An Enrolled Agent here will map where you sit in that sequence and what your window is — free, confidential. 888-825-7779.
Tax specialist: The date on the letter is the clock. Everything else is negotiable; that isn't.