Tax data downloads
Every data study we publish comes with the numbers behind it. This page collects those files in one place so you can check our math, build your own chart, or cite the figures in your own work. Each file is a plain CSV that opens in Excel, Google Sheets or any statistics tool.
The figures come from public sources, mostly the IRS Data Book, IRS Statistics of Income tables and the California Franchise Tax Board. Each study names its exact source table and the date we read it, and the article linked under each file explains how we built the numbers and what they do and do not show. Where an agency revises a table, we update the file and say so in the article.
You are welcome to use these files. If you publish something built on them, a link back to the study is appreciated. Questions about a figure go to the team through the contact page.
California FTB Top 500 Delinquent Taxpayer List, Analyzed
Download ftb-top-delinquent-taxpayers-2026-by-county.csv (CSV, 40 rows). Columns: county, entries, individuals, businesses, total balance usd.
Written up in: California FTB Top 500 Delinquent Taxpayer List, Analyzed.
IRS Penalties Assessed and Abated by Year, 2021-2025
Download irs-civil-penalties-assessed-abated-by-year-2021-2025.csv (CSV, 5 rows). Columns: fiscal year, all penalties assessed number, all penalties assessed usd, all penalties abated number, all penalties abated usd, individual assessed number, individual assessed usd, individual abated number and 11 more.
Written up in: IRS Penalties Assessed and Abated by Year, 2021-2025.
IRS Installment Agreements by Year: 2021-2025 Data
Download irs-installment-agreements-by-year-2021-2025.csv (CSV, 5 rows). Columns: fiscal year, beginning inventory, new agreements, taxpayers full paid, ending inventory, amount collected usd.
Written up in: IRS Installment Agreements by Year: 2021-2025 Data.
Federal Tax Liens, Levies and Seizures by Year 2020-2025
Download irs-liens-levies-seizures-by-year-2020-2025.csv (CSV, 6 rows). Columns: fiscal year, notices of federal tax lien filed, notices of levy requested on third parties, seizures.
Written up in: Federal Tax Liens, Levies and Seizures by Year 2020-2025.
IRS Math Error Notices by Year: 2021-2025 Volumes
Download irs-math-error-notices-by-year-2021-2025.csv (CSV, 5 rows). Columns: fiscal year, notices current tax year returns, notices prior year returns, notices total, errors current tax year returns, errors prior year returns, errors total, current tax year and 2 more.
Written up in: IRS Math Error Notices by Year: 2021-2025 Volumes.
20 Most-Asked IRS Notice Questions (Forum Data, 2026)
Download irs-notice-questions-forum-2026.csv (CSV, 39 rows). Columns: item, type, posts matching title only, posts matching title and text, share of posts pct title and text.
Written up in: 20 Most-Asked IRS Notice Questions (Forum Data, 2026).
IRS Notice Searches by Month: 5 Years of Google Trends
Download irs-notice-search-seasonality-2021-2026.csv (CSV, 61 rows). Columns: month, IRS notice, IRS letter, CP14, CP2000, CP504, 5071C, 4883C and 5 more.
Written up in: IRS Notice Searches by Month: 5 Years of Google Trends.
Offer in Compromise Acceptance Rate by Year, 2021-2025
Download irs-offer-in-compromise-by-year-2021-2025.csv (CSV, 5 rows). Columns: fiscal year, offers received, offers accepted, acceptance rate pct, amount accepted usd, average accepted offer usd.
Written up in: Offer in Compromise Acceptance Rate by Year, 2021-2025.
Notice of Federal Tax Lien Filings Statistics 2026
Download socal-federal-tax-liens-2016-2025.csv (CSV, 163 rows). Columns: table, county, period, measure, value, source.
Written up in: Notice of Federal Tax Lien Filings Statistics 2026; Federal Tax Liens in Southern California: 10-Year Data.
Looking for the rules behind the numbers rather than the numbers themselves? Start with how tax relief works or the IRS notice master list.