Beware: These Tax Return Red Flags Could Catch the Eye of the IRS

April 20, 2026
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Tax time can be one of the most hated times of the year. Just preparing the forms is enough to be an irritant, and if you owe the government money there’s a good chance that you’re downright annoyed. But neither of those things compare to the feeling that accompanies an envelope bearing an IRS return address, alerting you to the fact that your taxes are about to be audited. The truth is that audits are relatively rare in the United States. As much as people fear them, the IRS reports that between 2010 and 2018 only 0.6% of individual tax returns resulted in an audit. That may make you feel better, but statistically speaking that still means that more than 250,000 taxpayers had to go through the process. In many cases the audit process could have been avoided had the taxpayers simply known what we’re about to spell out for you – that there are specific triggers that send up IRS red flags and frequently lead to an audit process. The red flags include: Disparities Between Information on Tax Forms and Reported Income Whether you’re a W-2 employee or self-employed, the IRS will compare the income information that you report on your tax forms with the W-2 and 1099 forms that are sent by those individuals and entities that have paid you. If the two don’t match, the IRS is going to want to know why. Disparities Between Business Income and Business Expenses Just as the IRS will respond when your tax form income and reported income don’t match, the same is true for businesses that report business expenses that don’t make sense. In some cases, they are looking for people who are trying to take business expense deductions for what is really a hobby rather than a business. Many times these disparities are the result of actual expenses incurred for which income went unreported. Though there is always the chance that the odd numbers are an accident, such as the result of duplication of employee and business expenses, that oversight can lead to the discomfort of an audit, so take the time to double and triple check before filing your tax forms. Outsized Charitable Contributions Our tax system awards charitable contributions with tax deductions, and though that has proven to be a powerful incentive for some, it has also served as a temptation. To counter this, the IRS has created an automated computer program that analyzes nearly every return to identify figures that seem outsized as compared to an individual’s income, as well as other factors that are commonly abused. The system assesses each return based on numerous factors and assigns a DIF, or Discriminate Function, score. If your return exceeds the IRS DIF score threshold, there’s a good chance you’re headed for an audit. Disparities Between Lifestyle Expenses and Reported Income As with other mismatches found on tax returns, the IRS is particularly sensitive to returns in which taxpayers take deductions for expenses reflective of a high income living and yet report income that is much more modest. Paying personal property taxes, real estate taxes and taking mortgage interest deductions for million-dollar lifestyles will raise a red flag if the income you’re reporting is not enough to support it. When You Happen to Hit Right on the Income to Expense Ratio You Need to Qualify for the Earned Income Credit To claim the Earned Income Credit — which can be as high as $6,660 for tax year 2020 — taxpayers’ income has to be below a certain level, and if you’re a business owner whose return includes a Schedule C to prove all offsetting expenses, there is a particular ratio that you need to achieve in order to qualify. In most cases a business will either be somewhere below the ratio or above the ratio: They’ll either qualify for a larger earned income credit or they won’t. If the number hits exactly at the level needed to qualify for the larger credit, the IRS is more likely to ask for a closer look to see if numbers on either side of the equation have been manipulated. Disproportionate Itemized Deductions If you qualify to itemize, then you’re entitled to take deductions for qualifying expenses. But in cases where itemized deductions seem disproportionately high, the IRS is likely to ask some questions. If the expenses are legitimate and you’re able to present documentation, you’ll be fine, but make sure that you hold onto all receipts, as there’s a good chance that you’ll be called in for an audit. One important thing to remember: You may have been able to deduct unreimbursed employee business expenses in the past, but that stopped being true for federal income taxes after tax year 2017. Some states, including California, still permit those deductions on state taxes, so make sure that you maintain receipts for those returns as well. Lapses in Reporting Cryptocurrency Transactions Bitcoin and other virtual currency transactions have led to plenty of tax return headaches, as in the last several years approximately 10,000 taxpayers have failed to report gains or losses on this innovative currency. To address the issue, the IRS has taken to sending taxpayers letters providing a chance to take part in a voluntary disclosure program. The agency is clearly on the watch for and acting upon this particular red flag. In addition, the IRS has added a question to the 1040: “Did you receive, sell, send, exchange, or otherwise acquire any financial interest in any virtual currency?” Of course, if you answer no and later it is determined you did, then you have committed perjury since you sign your return under penalty of perjury. Rental Property Expenses that Appear to be Inflated One of the most common reasons for tax returns to be flagged is rental expenses that appear to be inflated. Taxpayers who prepare their own returns and who report deductions for rental income on their Schedule E need to ensure that they fully understand that some deductions are allowed and some need to be capitalized over time, as not knowing which is which could lead to a return being flagged. There are also special and rather complicated rules associated with renting a vacation home, room rentals and short-term rentals. Two People Claiming the Same Dependent It is not at all uncommon for families that split custody of a dependent as a result of separation or divorce to alternate the years in which they claim a dependent, but if mistakes – or fraud - are detected and both are claiming the same individual, that will be sure to trigger an audit. Proving custody will require documentation, including school records and birth certificates. Not Understanding Which Filing Status to Use Though the head of household filing status is extremely useful, it can also be confusing and lead to mistakes when filling out status, and especially regarding how dependents are treated. Though the Tax Cuts and Jobs Act of 2017 was supposed to simplify the tax form process, in this particular area it made things even more complicated by introducing a new $500 credit for ‘qualifying relatives’, which is defined by certain tests that may make people not related to the taxpayer eligible as a dependent while not making the taxpayer eligible for the head of household filing status. Failure to Report Overseas Accounts Whether it generates taxable income or not, if you are a U.S. citizen or U.S. resident with interest in, authority over, or signature authority on foreign financial accounts that exceed $10,000 at any time during the calendar year, you are required to report them to the U.S. Treasury Department under the Bank Secrecy Act. The appropriate form to be filed is the Report of Foreign Bank and Financial Accounts, or FBAR. Failing to disclose these accounts can have significant repercussions and are likely to be discovered as a result of disclosure requirements placed on foreign financial institutions. In Case of Audit The goal of providing this information is to fend off the possibility of red flags ever being raised on your tax filing. However, if one of those envelopes with the IRS return address appears in your mailbox, contact us immediately.

Tax and Financial Insights
by NR CPAs & Business Advisors

Explore practical articles that explain tax strategies, financial considerations, and important topics that may affect your business decisions.

2026 IRS Mileage Rates: Key Updates and Insights

The IRS has rolled out the inflation-adjusted mileage rates for 2026, offering taxpayers an efficient way to claim deductions for vehicle-related expenses incurred for business, charity, medical, or moving purposes. These adjustments reflect the continued economic shifts impacting car operation costs.

Effective January 1, 2026, the new standard mileage rates are established as follows:

  • Business Travel: Increased to 72.5 cents per mile, inclusive of a 35-cent-per-mile depreciation allocation. This marks a rise from the 70 cents per mile rate set for 2025
  • Medical/Moving Purposes: Reduced slightly to 20.5 cents per mile, down from 21 cents in the previous year, reflecting the variable cost considerations.
  • Charitable Contributions: Consistent at 14 cents per mile, a fixed rate unchanged for over a quarter-century.

As is typical, the business mileage rate considers the integral fixed and variable costs of automobile operation. Meanwhile, the medical and moving rates remain contingent on variable expenses as determined by the IRS study.

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It is critical to note that the One Big Beautiful Bill Act (OBBBA) held firm on disallowing moving expense deductions except for specific cases within the Armed Forces and intelligence community, marking a substantial shift since 2017.

When engaging in charitable work, taxpayers might opt for a direct expense deduction over the per-mile method, covering gas and oil costs. However, comprehensive upkeep and insurance costs are non-deductible expenses.

Business Vehicle Use Considerations: Taxpayers can alternatively compute vehicle expenses using actual costs, which might benefit from shifting depreciation rules, particularly through bonuses and first-year advantages. Keep in mind, however, reverting from actual cost calculations to standard rates in subsequent years is restricted, particularly per vehicle protocol and when exceeding four vehicles in concurrent use.

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Additionally, parking, tolls, and property taxes attributable to business can be deducted independently of the general rate, an often-overlooked advantage by many business owners.

Tax Strategies for Employers and Employees: Reimbursements based on the standard mileage framework, providing the right documentation is in place, remain tax-free for employees. Meanwhile, the elimination and continued prohibition of unreimbursed employee deductions continue, with particular exceptions offered to qualified personnel across specific occupations.

Opportunities for Self-employed Individuals: Entrepreneurs remain eligible for deductions on business-related vehicle use via Schedule C, with potential to account for business-use interest on auto loans.

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Heavy SUVs and Deduction Advantages: Heavier vehicles exceeding 6,000 pounds but under 14,000 pounds open opportunities for substantial tax deductions through Section 179 and bonus depreciation avenues. The lifecycle of such a vehicle bears implications on recapturing initially claimed deductions, urging cautious tax planning.

For professional guidance on optimizing your vehicle-related tax deductions and understanding their implications on tax strategies, contact our office in Coral Gables, Florida, where expert advice and strategic insights are just a call away.

Educator's Deduction Reform: Key Changes Under OBBBA

The One Big Beautiful Bill Act (OBBBA) introduces significant enhancements for educators' tax deductions starting in 2026, offering both strategic opportunities and planning considerations for educators who qualify. With the reinstated itemized deduction for qualified unreimbursed expenses, educators have a broader spectrum of financial relief. This is complemented by the retention of the $350 above-the-line deduction, allowing educators to maximize their tax benefits by selectively allocating expenses between these avenues.

Understanding the nuances of these changes is crucial for educators and financial advisors alike. The dual-option deduction strategy can potentially enhance tax efficiency, thereby aligning with broader financial planning goals.

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At NR CPAs & Business Advisors, based in Coral Gables, Florida, our expertise in tax preparation and planning provides invaluable support to educators navigating these changes. Our comprehensive approach, combined with personalized advice from our experienced team, ensures compliance and optimization in line with the latest tax legislations.

Given these updates, it is imperative to engage with seasoned professionals to fully leverage your deduction strategies. Contact us today to streamline your tax planning under OBBBA's new guidelines and maximize your deductions for upcoming tax years.

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