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Tax facts & stats

6 sourced facts about taxes, each with the context behind the number. 4 more are in today's round and appear here after it closes.

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The basics

What share of individual federal tax returns were filed electronically in fiscal 2025?

Answer93.7%

Only about 10.3 million of the 162.8 million individual returns were still filed on paper.

Source: IRS Data Book, FY2025 (Publication 55B) (2025) irs.gov

Which state's taxpayers paid the most total federal tax (before refunds) in fiscal 2025?

AnswerCalifornia

California led, followed by Texas and New York, largely reflecting population and income.

Source: IRS Data Book, FY2025 (Publication 55B) (2025) irs.gov

Going deeper

Expert level

Which OECD country collected the least tax relative to GDP in 2024?

AnswerMexico (18.3%)

Mexico's ratio was less than half of top-ranked Denmark's 45.2%.

Source: OECD, Revenue Statistics 2025 (2024) oecd.org

About how many tax return audits did the IRS close in fiscal 2025?

Answer497,621

Those audits resulted in $26.8 billion in recommended additional tax — out of hundreds of millions of returns filed.

Source: IRS, SOI Tax Stats – IRS Data Book, FY2025 (2025) irs.gov

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