Nobody wants to open their mailbox and find a letter from the IRS requesting an audit. While the chances of getting audited remain relatively low for most Americans, certain mistakes on your tax return can significantly increase your odds. The IRS uses sophisticated computer programs and experienced auditors to flag returns that look suspicious or contain common errors. With increased funding for enforcement activities, the tax agency is hiring more examiners and expanding its reach. Understanding what triggers these audits can help you file your return correctly and avoid unnecessary headaches down the road.
Missing income from your tax return creates problems
The most common mistake taxpayers make is forgetting to report all their income. Maybe you switched jobs mid-year and forgot about the W-2 from your old employer, or you have an old investment account that generated some interest. Every company that pays you money sends the same tax forms to the IRS that they send to you. Their computers automatically match all those forms against what you report on your 1040. When something doesn’t match up, you’ll get a letter asking about the missing income. This includes obvious sources like your regular paycheck, but also distributions from college savings accounts, old brokerage accounts, and freelance payments.
Side hustles deserve special attention because many people don’t realize this income is taxable. If you walk dogs, tutor students, drive for Uber or Lyft, give piano lessons, or sell crafts on Etsy, you need to report that money. Even if you don’t receive a 1099 form for the work, the income still counts. The IRS knows that cash-based businesses and gig work often go unreported, so they specifically look for signs of missing income. Keep careful records of all money you receive throughout the year, and make sure every dollar gets reported on your return to avoid raising red flags.
High earners face more scrutiny automatically
Making good money comes with extra attention from tax auditors. The IRS audited only about one percent of people earning less than $200,000 last year, but that number jumps to almost four percent for those making more. If you’re pulling in over a million dollars annually, your audit risk climbs to 12.5 percent. This isn’t personal, it’s just math. The tax agency wants to maximize its return on investment, and higher earners typically have more complex returns with more opportunities for errors or intentional underreporting. Corporations with over $10 million in assets get audited at a rate of 17.6 percent compared to just one percent for smaller businesses.
The IRS recently reactivated its high-wealth exam squad, a specialized team that reviews the returns of the super-rich. These auditors don’t just look at your personal tax return. They examine returns from all the entities you control, including foreign and domestic businesses, trusts, and partnerships. With the extra funding Congress approved, the agency plans to hire more experienced examiners specifically to audit high-income individuals and pass-through entities like LLCs. The good news is that Treasury officials promise individuals earning under $400,000 won’t see increased audit rates compared to historical levels, but if you’re above that threshold, expect more attention.
Business expenses that seem too high raise questions
Claiming deductions for your business is perfectly legal and smart, but going overboard will catch the IRS’s attention. The tax agency has statistical data showing typical deduction amounts for different professions and income levels. If your business meals, travel expenses, or vehicle costs are 20 percent or more above what’s normal for your occupation, expect a second look at your return. Auditors know that some people try to write off personal expenses as business costs. A fancy dinner with your spouse isn’t a business meal, and your daily commute to work doesn’t count as business travel, even if you own the company.
Vehicle deductions are particularly problematic because they’re easy to inflate. Claiming 100 percent business use of your car or truck is a huge red flag. IRS agents know it’s nearly impossible for someone to use a vehicle exclusively for work, especially if it’s your only car. Heavy SUVs and large trucks get extra scrutiny, particularly if you bought them late in the year to claim depreciation deductions. If you legitimately use your vehicle for business, keep detailed mileage logs with dates, destinations, and business purposes for every trip. Sloppy recordkeeping makes it easy for an auditor to disallow your entire deduction, costing you much more than if you’d just been conservative in the first place.
Running a small business increases audit risk
Schedule C is where self-employed people report their business income and expenses, and it’s also where the IRS finds lots of problems. Small business owners sometimes underreport their income or claim excessive deductions, whether intentionally or by mistake. The tax agency pays special attention to cash-intensive businesses like restaurants, hair salons, bars, car washes, and taxi services because cash transactions are easier to hide than electronic payments. Sole proprietors reporting at least $100,000 in gross receipts face higher audit rates, as do businesses claiming substantial losses year after year. If you’re reporting big losses that conveniently offset your other income from wages or investments, expect questions about whether you’re really running a business or just pursuing an expensive hobby.
The hobby loss rules exist because some people try to write off the costs of their recreational activities by calling them businesses. If you breed horses, make crafts, or pursue any activity that sounds like it could be fun, the IRS wants proof you’re actually trying to make money. Showing a profit in three out of five years helps establish that you’re running a legitimate business, not just trying to reduce your tax bill. Keep detailed records showing your business planning, marketing efforts, and steps you’re taking to become profitable. Document everything because if you get audited, the burden is on you to prove your business is real.
Charitable donations that look too generous
Donating to charity is admirable and provides valuable tax deductions, but claiming too much compared to your income raises suspicions. The IRS has data showing average charitable giving for every income level. If you’re claiming significantly more than typical for someone earning what you make, auditors will want proof. This becomes even more important when you donate property instead of cash, like giving stocks, real estate, or household items to charity. You need proper documentation for all donations, including receipts, acknowledgment letters from charities, and professional appraisals for valuable property. Failing to file Form 8283 for noncash donations over $500 essentially invites an audit.
Conservation easements have become a major target for IRS enforcement. These arrangements let property owners donate development rights to conservation organizations and claim huge tax deductions. While legitimate easements serve important environmental purposes, some promoters sell these deals as tax shelters with inflated appraisals. If you donated a conservation or facade easement, or invested in a partnership that did, your audit risk goes way up. Congress recently passed laws disallowing deductions in the most abusive cases. The lesson here isn’t to avoid charitable giving, but to make sure your deductions are accurate, properly documented, and proportional to your income.
Foreign bank accounts require careful reporting
Having money in foreign banks isn’t illegal, but you must report it correctly or face serious consequences. The Foreign Account Tax Compliance Act requires detailed disclosure of overseas financial assets. Banks in other countries must identify American account holders and provide information to the IRS, so the tax agency already knows if you have foreign accounts. You need to check the box on Schedule B indicating you have foreign accounts, and you must file Form 8938 if your foreign assets were worth at least $50,000 during the year. If the total value of all your foreign accounts exceeded $10,000 at any point, you also need to file a Report of Foreign Bank and Financial Accounts.
This creates an uncomfortable situation where following the rules increases your audit risk because auditors assume people with foreign accounts are trying to hide income. Not reporting the accounts, however, leads to massive penalties and potential criminal charges. The IRS specifically targets taxpayers with undisclosed foreign accounts as part of its enforcement priorities. If you inherited an account from a relative overseas or opened one while working abroad, don’t try to hide it. The penalties for noncompliance are severe, including fines that can exceed the account balance. Get professional help to make sure you’re filing all required forms correctly.
Home office deductions attract attention
Working from home became much more common recently, but that doesn’t mean everyone can claim a home office deduction. If you’re self-employed and use part of your home regularly and exclusively for business, you can deduct related expenses and depreciation. The key words are regularly and exclusively. Your home office can’t double as a guest bedroom or kids’ playroom. It needs to be a dedicated space used only for work. The larger the percentage of your home you claim as office space, the higher your audit risk becomes. Employees who work from home currently cannot claim home office deductions at all, even if your employer requires remote work.
The IRS knows many people are tempted to claim home office deductions now that remote work is common. Auditors will look for taxpayers bending or breaking the rules. If you legitimately qualify for the deduction, take it, but make sure you can prove the space meets all requirements. Take photos showing the dedicated office area, keep records of when and how you use the space, and calculate the business percentage of your home accurately. Measure the square footage carefully rather than guessing. Keep receipts for office furniture, equipment, supplies, and any improvements you make to the space. Proper documentation makes all the difference if you get audited.
Cryptocurrency transactions need accurate reporting
Digital currencies like Bitcoin and Ethereum have created new headaches for taxpayers and new opportunities for the IRS to catch mistakes. The tax agency now asks directly on your return whether you bought, sold, or traded cryptocurrency during the year. Answering yes puts you on their radar, but lying about it is worse because cryptocurrency exchanges report transactions to the IRS. Every time you sell crypto, trade one coin for another, or use it to buy something, you potentially trigger a taxable event. The rules are complicated and many people get them wrong, which is why crypto transactions have become a major audit trigger in recent years.
The IRS treats cryptocurrency as property, not currency, for tax purposes. This means you need to track your cost basis in each coin and calculate gains or losses when you dispose of it. If you traded frequently, you could have dozens or hundreds of taxable transactions to report. Using crypto to buy a coffee counts as selling the crypto for its dollar value at that moment. Many people don’t realize this and fail to report these transactions. Keep detailed records of every crypto purchase, sale, trade, and use. Note the date, value in dollars, what you paid for the coins originally, and the purpose of each transaction. Consider using crypto tax software to track everything because manual calculations get complicated quickly.
Rental property losses need proper documentation
Owning rental property can provide great tax benefits, but the rules are tricky and easy to mess up. Generally, rental activities are considered passive, which means you can only use losses to offset other passive income unless you qualify as a real estate professional. You might be able to deduct up to $25,000 in rental losses against your regular income if you actively participate in managing the property and your income is below certain thresholds. The IRS gets suspicious when people claim high rental rates but still show losses for the year. They want to see that you’re actually trying to make money, not just creating paper losses to reduce your tax bill on other income.
Document everything related to your rental property, including advertising for tenants, maintenance and repairs, property management activities, and time spent on rental-related tasks. Keep receipts for all expenses and separate personal use from rental use if you ever stay at the property yourself. If you use the property personally for more than 14 days or ten percent of the rental days, whichever is greater, you face additional restrictions on deductions. The home office rules apply if you use part of your home to manage rental properties. Calculate depreciation correctly and understand the difference between repairs you can deduct immediately and improvements you must depreciate over time. Getting these rules wrong almost guarantees problems if you’re audited.
Filing your tax return correctly doesn’t have to be scary if you understand what the IRS looks for and take time to document everything properly. Most audits happen because of honest mistakes rather than intentional fraud. Keep good records throughout the year, report all your income, and only claim deductions you’re truly entitled to take. If your tax situation is complicated because of business ownership, rental properties, foreign accounts, or substantial income, consider hiring a tax professional rather than going it alone. The cost of professional help is much less than the penalties, interest, and stress that come with an audit. When in doubt, be conservative with your deductions and transparent with your income reporting.
