Top 12 common IRS audit triggers: A guide for US expats
For US expatriates, navigating the tax waters can be even more daunting than for stateside citizens.
Understanding the common IRS audit triggers is essential in steering clear of tax woes.
We have carefully compiled a list of 12 red flags that could prompt the IRS to take a closer look at your tax return.
“In this world, nothing can be said to be certain, except death and taxes.” – Benjamin Franklin
As an American expat, filing your taxes accurately is paramount. Not only do you need to consider US tax laws, but often those of your country of residence as well.
Let's explore the IRS audit triggers to keep you in the clear.
1. Failing to report worldwide income
As an American citizen or green card holder, you are required to report your worldwide income, even if you reside outside the United States.
US citizens and resident aliens generally must report worldwide income (earned and unearned) and may still need to file even if credits/exclusions reduce US tax to zero. Tools like the Foreign Earned Income Exclusion (FEIE) and the Foreign Tax Credit (FTC) can reduce double taxation, but they don’t remove the underlying reporting and filing responsibilities.
IRS audit red flags: Not reporting foreign bank accounts, omitting income earned outside the US, or not reporting rental income from foreign properties.
2. Discrepancies between reported income and lifestyle
A common reason the IRS contacts taxpayers is a mismatch between what you reported and what payers reported (Forms W-2, 1099, etc.). These mismatches can lead to a CP2000 notice proposing changes and asking you to explain or correct the difference.
If you’re audited, the IRS may also look at whether your reported income reasonably supports your expenses – but the clearest day-to-day ‘trigger’ is usually third-party data that doesn’t match your return.
NOTE! For federal Form 1099-K reporting by payment apps and online marketplaces (TPSOs), the law has reverted to the pre-ARPA threshold. For 2025 activity (reported on Forms 1099-K issued in 2026), TPSOs generally aren’t required to file Form 1099-K unless payments for goods or services exceed $20,000 and there are more than 200 transactions.
A platform may still send a 1099-K below the threshold, and some states have lower thresholds – so third-party matching risk still exists
3. Errors in reporting foreign assets and accounts
Expats may have to report foreign financial accounts on a Foreign Bank and Financial Accounts (FBAR) (FinCEN Form 114) and may also have to file Form 8938 (FATCA) – these are separate requirements, and some taxpayers must file both.
For taxpayers living abroad, Form 8938 generally applies if specified foreign financial assets exceed $200,000 on the last day of the year or $300,000 at any time (single or filing separately), or $400,000 / $600,000 for joint filers. Missing or inconsistent foreign reporting can increase audit risk – so focus on completeness and consistency across forms.
Red flags: Not filing FBAR or Form 8938 when required, providing incomplete or inaccurate information, or underreporting account balances.
Also read. FBAR filing – A detailed look at when, how to plus all requirements & deadlines
4. Claiming the foreign earned income exclusion inappropriately
To qualify for the Foreign Earned Income Exclusion (FEIE), you must meet the Physical Presence Test or the Bona Fide Residence Test.
Red flags: Claiming the exclusion without meeting the necessary criteria or making inconsistent claims from year to year.
5. Math errors
Simple mathematical errors can cause discrepancies in your return and inadvertently flag your tax return for review.
Red flags: Miscalculations, transposed digits, inconsistent entries, or failure to report all forms of income.
6. Large charitable donations
The IRS takes notice if the charitable donations you claim are disproportionately large compared to your income.
Red flags: Claiming large charitable donations without proper documentation or donations that significantly reduce your taxable income.
7. Home office deductions
Expats working remotely must be cautious when claiming home office deductions.
Home office deductions are mainly a self-employed deduction. If you run a business (or freelance) and use part of your home regularly and exclusively for that business, you may qualify.
But if you’re a W-2 employee working remotely, you generally can’t claim a federal home office deduction under current law. If you are eligible, keep clear records (space used, expenses, and business purpose).
Red flags: Claiming this deduction without meeting the IRS criteria or making excessive claims for home office expenses.
Also read. Digital nomad taxes – guide 2026
8. Overstating business expenses
For self-employed expats, business expenses can provide valuable deductions. However, exaggerating these claims can draw unwanted attention.
Red flags: Reporting unusually high expenses relative to income or claiming personal expenses as business expenses.
9. Utilizing aggressive or shady tax schemes
Engaging in aggressive tax avoidance schemes can put you on the IRS radar. These schemes often involve complicated transactions designed to exploit loopholes in the tax code.
Red flags: Using offshore tax havens, engaging in transactions with no economic substance, or participating in schemes that appear to be primarily for avoiding US taxes.
Filing or failing to file Form 3520 or Form 3520-A for foreign trusts and gifts – a common compliance gap for expats with offshore estate planning structures, and a known IRS enforcement area.
10. High income
Overall, IRS audit coverage is low for most filers, but it’s best to use the IRS’s published examination coverage statistics. In the IRS Data Book (FY2024), the exam coverage rate for tax year 2022 individual returns was 0.2% as of Sept. 30, 2024 (and can rise as additional exams are completed). In FY2024, the IRS closed 444,014 individual income tax return examinations.
However, that average masks a sharp divide by income level. Enforcement also shifts with IRS priorities, staffing, and the audit plan for a given year.
For example, the FY2024 IRS enterprise examination plan increased planned audit starts for individual returns with total positive income (TPI) over $400,000 to 17% of planned starts, up from 6% in the FY2019–FY2023 average – almost 2.5 times higher. That matters for expats because higher-income returns tend to be more complex: multiple pay sources, equity comp, foreign accounts, and cross-border reporting that must line up across forms.
For more context, see the latest IRS audit statistics.
IRS audit coverage rates by income
| Income level (TPI) | Audit coverage rate |
|---|---|
| Under $25,000 | 0.4% |
| $25,000–$49,999 | 0.2% |
| $50,000–$499,999 | 0.1% |
| $500,000–$1 million | 0.6% |
| $1 million–$5 million | 1.1% |
| $5 million–$10 million | 3.1% |
| Over $10 million | 4.0% |
Red flags: Substantially higher income compared to previous years, especially when coupled with aggressive deductions, or having multiple foreign financial accounts.
11. Inconsistent filing history
Consistency in tax filings is important. The IRS can be alerted to possible issues if your filing history is erratic, particularly when it comes to foreign income and assets.
Red flags: Switching frequently between filing statuses, not filing annually, or inconsistent reporting of similar items from year to year.
12. Cryptocurrency and digital assets
The IRS has explicitly asked about digital assets on Form 1040 since 2019 – every taxpayer must answer yes or no, regardless of whether they traded. Answering no while exchanging data shows otherwise is a direct audit trigger.
Starting with the 2025 tax year, brokers and digital asset platforms are required to report gross proceeds on the new Form 1099-DA – the crypto equivalent of a Form 1099-B for stocks. Beginning in 2026, cost basis will also be reported for certain transactions. This means the IRS can now automatically cross-reference your Form 8949 against exchange-reported proceeds, just as it does with stock sales.
Red flags: Answering No to the digital assets question on Form 1040 when exchange records show activity; proceeds on Form 1099-DA that don't match Form 8949; large crypto gains with no corresponding Schedule D entry; foreign exchange holdings without FBAR/FATCA reporting if balances exceed thresholds.
Learn more in the IRS digital assets FAQ.
Bottom line
Navigating the US tax system as an expat can be daunting. Staying informed about the IRS audit triggers and keeping meticulous records can save you time and stress.
When in doubt, seek advice from a tax pro well-versed in expatriate tax issues. As Benjamin Franklin said, “An investment in knowledge pays the best interest.”
Learn more about your personal audit odds in our detailed guide to IRS audit rates for US expats.
FAQ
Not reporting all income, as the IRS compares your reported income against Forms 1099, W-2, K-1, etc., can trigger an audit. Discrepancies between these documents and your tax return may lead to closer scrutiny.
Not automatically – but failing to report it does. If the aggregate value of your foreign accounts exceeds $10,000 at any point during the year, FBAR filing is generally required. FBAR penalties are adjusted for inflation: for non-willful violations assessed on or after Jan. 17, 2025, the maximum civil penalty is $16,536 per violation, and non-willful “violations” are generally treated as one per annual FBAR report (not per account). Willful penalties can be much higher (up to the greater of $165,353 or 50% of the account balance, adjusted for inflation).
The IRS often audits high-income individuals, self-employed persons, business owners, cryptocurrency holders, and those with foreign income and assets due to the complexity and potential for discrepancies in their tax returns.
The standard IRS assessment window is usually 3 years after your return is filed (or due), and it can extend to 6 years if you reported 25% or less of your income. If you never file, or you file fraudulently, the IRS can assess tax at any time. Missing international information returns (such as Form 8938 or Form 5471) can keep the assessment period open until the required information is filed, and then for at least 3 years after that. FBAR penalties follow a separate rule – generally 6 years from the FBAR due date.
Yes – and the risk has increased significantly. Starting with 2025 returns, crypto brokers must report proceeds to the IRS via Form 1099-DA. If exchange-reported proceeds don't match your Form 8949, the IRS automated matching system flags the discrepancy automatically. For expats using foreign exchanges, holdings above $10,000 may also require FBAR reporting, adding another layer of compliance risk. Learn more about Form 1099-DA.
