Key Takeaways
- The overall IRS audit rate remains well under 0.5%, but it rises sharply with income - roughly 0.6% at $500K-$1M up to around 4% above $10 million in 2026.
- IRS staffing cuts (examination staff down ~22% since 2024, the billionaire-audit unit down 38%) mean actual audits of high earners are running well below the agency's own targets.
- Correspondence audits (a mailed request for documentation) are up about 34% and are by far the most likely audit format today, not in-person exams.
- The unreimbursed employee business expense deduction is now permanently eliminated for most W-2 employees under the OBBBA, not just temporarily suspended.
- New OBBBA deductions for tips and overtime are untested by IRS matching systems in 2026 - expect some correspondence audits tied to documentation gaps on these claims.
- Audits generally reach back 3 years, but extend to 6 years for a substantial income understatement and have no time limit for fraud or unfiled returns.
Most taxpayers, myself included, share the same dread of getting audited. In reality, the odds aren’t that high for most filers, and recent IRS staffing cuts have pushed them even lower — though not evenly across income levels.
The IRS audits well under 0.5% of the more than 150 million returns filed each year. That average hides a wide range: audit rates climb sharply the higher your income goes, and the agency has openly said it wants to keep rates for anyone earning under $400,000 at 2018 levels.
The 2026 Numbers: Fewer Audits, Especially at the Top
Here’s where it gets interesting. The IRS previously announced plans to sharply increase audits of high earners and large partnerships using funding from the Inflation Reduction Act. That hasn’t played out the way it was planned.
IRS examination staffing has dropped by roughly 22% since 2024, and the division responsible for auditing billionaires lost about 38% of its staff, per Kiplinger’s reporting on the cuts. New audits of filers earning $10 million or more came in at nearly half of what the IRS had targeted for the year, and new partnership audits landed at about half of target too.
The practical result: audit rates by income bracket for 2026 look roughly like this — 0.6% for filers earning $500,000 to $1 million, 1.1% for $1 million to $5 million, 3.1% for $5 million to $10 million, and around 4% for those above $10 million. All of these are lower than the IRS’s own stated goals, a direct consequence of a smaller workforce.
What’s grown instead is the correspondence audit — the mailed request for documentation rather than an in-person exam. Correspondence audits are up roughly 34% as the IRS leans on the cheaper, more automated review method to cover for reduced staff. If you get audited today, a letter is by far the more likely outcome than a face-to-face meeting.
None of this means the underlying reasons returns get pulled have changed. It just means the IRS is being more selective about which flagged returns get real attention.
Common Reasons Returns Are Pulled for Review
- New items compared to your last few years of filing. A return that looks meaningfully different from your recent history — a new business, a big new deduction, a large swing in income — draws a second look.
- Refundable credit discrepancies. Mismatches on credits like the Child Tax Credit and Kiddie Tax”) or Earned Income Tax Credit“) are a longstanding trigger. Worth watching for 2026 specifically: the new OBBBA deductions for tips and overtime pay are untested territory for the IRS’s automated matching systems, and errors on first-time claims are common.
- Filing before your W-2 arrives. Using your last pay stub instead of the actual W-2 is a frequent source of math errors that flags a return.
- Education credit claims that don’t match what your school reported on Form 1098-T.
- Identity verification issues tied to prior fraud flags on your account.
- Adding or dropping dependents from one year to the next without an obvious life event (new baby, custody change) to explain it.
- An offset for prior-year debt that won’t show up on the refund offset line — call the Treasury Offset Program at 800-304-3107 if you suspect this.
- A missing Form 1095-A for marketplace health insurance, when the IRS has a record you had coverage.
Types of IRS Audits
Despite what you see in movies, most IRS audits don’t involve agents in suits going through your filing cabinet. The large majority are correspondence audits — a letter asking for documentation on a specific item, not a meeting.
You can generally tell if a past return was audited by looking for Code 420 on your IRS transcript.
What Actually Triggers a Closer Look
Every return gets a score from the IRS’s Discriminant Function (DIF) system, based on how it compares to a large sample of similar returns. A taxpayer earning $100,000 who claims a charitable deduction well above what’s typical for that income level gets a higher score, and a higher chance of review.
That system is built to catch unusual deductions, not underreported income, so the IRS separately runs targeted projects aimed at cash-heavy businesses — restaurants, salons, and similar — where income is harder to verify against third-party reporting. Anyone paid on a 1099 is easier to check, since the IRS already has a matching record from whoever paid them.
The stakes for the IRS are bigger than they used to be. The agency’s latest tax gap estimate puts the gross gap — taxes owed but not paid on time — at about $696 billion for tax year 2022, with roughly $606 billion of that never recovered even after enforcement and late payments. Underreported income is the largest single piece of that gap, which is exactly why cash-heavy and 1099-based income keep getting extra attention.
Deductions That Still Draw Scrutiny
Take your legitimate deductions, but keep the receipts to back them up if asked. A few categories the IRS pays particular attention to:
Home-office deduction. Still commonly claimed, still commonly scrutinized, since relatively few filers who claim it actually meet the strict “regular and exclusive use” test.
Income from offshore accounts. The IRS continues to prioritize foreign account disclosure matching, cross-checking foreign bank data against what filers report.
Wage income paired with a Schedule C loss. A full-time W-2 earner who also reports a losing side business — especially something that could look like a hobby (a small farm, a horse-breeding operation) — tends to get a second look.
Net operating loss carrybacks. Businesses claiming a carryback often need to substantiate the loss more thoroughly than in a typical year.
Capital gains exclusion on a home sale. With home values up significantly in many markets, more filers are bumping into the $250,000 (single) / $500,000 (married filing jointly) gain exclusion limits. Keep records of home improvements — they raise your basis and reduce your taxable gain, but only if you can document them.
One category that used to be a classic audit magnet no longer applies to most people: unreimbursed employee business expenses. This was already suspended for regular W-2 employees from 2018 through 2025 under the Tax Cuts and Jobs Act, and the One Big Beautiful Bill Act made that suspension permanent starting in 2026. Today it only applies to Armed Forces reservists, qualified performing artists, fee-basis government officials, and employees with impairment-related work expenses — plus a separate, modified above-the-line deduction of up to $350 for educators’ out-of-pocket classroom expenses. If you’re a regular employee, this deduction simply isn’t available to you anymore, audit risk or not.
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If the IRS Comes Calling
Never ignore an IRS letter, and respond before the deadline printed on it. If a professional or firm prepared your return, loop them in immediately — they can usually respond directly to the IRS on your behalf.
If you filed yourself, gather the documentation requested and respond completely the first time; incomplete responses are what turn a simple correspondence audit into a drawn-out one. Most tax software also offers audit protection add-ons, worth considering if you’re claiming anything unusual this year.
A face-to-face audit is rare, but if you’re called in for one, bring a CPA or tax attorney, especially if a paid preparer did your original return.
How Far Back Can My Return Be Audited?
The standard rule is three years from your filing deadline. But there are real exceptions worth knowing:
- Six years if you understated your gross income by more than 25% — this also covers significant basis overstatements.
- No limit at all if the IRS finds fraud, or if you never filed a return in the first place — the clock simply never starts.
- Six years if you failed to report more than $5,000 of income from a specified foreign financial asset.
Separately, the IRS generally has 10 years to collect a tax debt once it’s assessed — a longer and different clock than the audit window itself.
Looking Ahead: 2027 Filing Season
Two things worth watching. First, whether IRS audit rates for high earners start closing the gap with the agency’s stated targets, or whether continued staffing constraints keep pushing actual enforcement further below plan — FY26 is already tracking behind FY25, which itself missed targets.
Second, 2026 returns claiming the new OBBBA tips and overtime deductions will be the first real test of how the IRS’s matching systems handle them. I’d expect some correspondence audits tied specifically to documentation gaps on those claims as the IRS works out its verification process, and I’ll update this page once there’s real data on how that’s playing out.
Common Issues to Watch Out For
- Assuming a low overall audit rate means you’re safe. The overall rate is low, but it climbs fast once you’re claiming unusual deductions relative to your income, regardless of how much you earn.
- Filing before your final W-2 arrives. This remains one of the most avoidable triggers — the numbers on your last pay stub rarely match your W-2 exactly.
- Ignoring a correspondence audit letter. These are simple to resolve if you respond promptly and completely; they get complicated fast if you don’t.
- Not keeping receipts for large or unusual deductions. The deduction itself isn’t the problem — an unsubstantiated deduction is.
- Claiming the unreimbursed employee expense deduction as a regular W-2 employee. It’s gone for 2026 unless you fall into one of the narrow exception categories above.
