The primary red flag for the IRS is any inconsistency between reported income and documentation, such as W-2s or 1099s. Other major audit triggers include unreported income (including crypto and gig work), excessive or unusual deductions relative to income, large cash transactions, and failing to report foreign accounts.
Not reporting all of your income is an easy-to-avoid red flag that can lead to an audit. Taking excessive business tax deductions and mixing business and personal expenses can lead to an audit. The IRS mostly audits tax returns of those earning more than $200,000 and corporations with more than $10 million in assets.
Failing to report all taxable income
IRS computers are pretty good at cross-checking the forms with the income shown on your return. A mismatch sends up a red flag and causes the IRS computers to spit out a bill that the IRS will mail to you (these letters don't count as audits for purposes of the IRS's audit rate).
Businesses that show losses are more likely to be audited, especially if the losses are recurring. The IRS might suspect that you must be making more money than you're reporting. Otherwise, why would you stay in business? Most likely to be audited are taxpayers reporting small business losses.
Income tax refund delays in 2025 (for the 2024 tax year) happen due to errors, fraud protection, claiming specific credits like EITC/ACTC (held until mid-Feb by law), missing info, or general IRS review, with increased scrutiny on identity theft and income mismatches leading to longer processing times. Common culprits include wrong SSNs, math errors, incomplete forms, and discrepancies with income reported by employers.
Failing to Report All Taxable Income
A mismatch sends up a red flag and causes the IRS computers to spit out a bill. If you receive a 1099 showing income that isn't yours or listing incorrect income, get the issuer to file a correct form with the IRS.
The overall odds of an IRS audit are low, about 4 out of every 1,000 returns. However, high-net-worth individuals are more likely to be targeted due to complex income sources, large deductions, and sophisticated financial structures.
Although many cash transactions are legitimate, the government can often trace illegal activities through payments reported on complete, accurate Forms 8300, Report of Cash Payments Over $10,000 Received in a Trade or Business PDF.
The IRS $600 rule refers to a change in reporting requirements for third-party payment apps (like Venmo, PayPal) for taxable income from goods and services, where platforms must send a Form 1099-K if you receive over $600 in a year, intended to capture gig economy/side hustle income, though delays and phased implementation have adjusted the timeline, with current rules for 2024 using a higher threshold ($5,000) before fully phasing to $600 for future years, but remember all taxable income, regardless of form, must always be reported.
As your family's income and assets increase, so does the likelihood of drawing attention from tax authorities. And with the IRS now using data analytics to help flag returns with certain markers, it's important to understand the most common audit triggers and ways to manage this risk.
How far back can the IRS go to audit my return? Generally, the IRS can include returns filed within the last three years in an audit. If we identify a substantial error, we may add additional years.
The IRS will never initiate contact demanding immediate payment via gift cards, prepaid debit, or wire transfers; threaten immediate arrest or deportation; or contact you first by email, text, or social media; these tactics, especially involving urgent demands for specific payment types or threats, are key signs of a tax scam, as the IRS always mails a bill first and allows time to appeal.
Large swings in income
This can be the case for those who are self-employed or own a business. Big changes in income are a huge red flag for the IRS because they sometimes signal underreported income, either in the current year or in previous years.
You know the IRS might be investigating you through official mail (first contact), phone calls (often with automated messages to IRS.gov), or in-person visits, but signs of a criminal probe include contact with IRS Criminal Investigation (CI) agents, subpoenas to you or your bank, questions to your accountant/bank, unusual account activity (freezing/refusing transactions), or agents suddenly going silent after an audit. Key indicators are official IRS letters, contact from CI special agents, third-party inquiries, and formal summonses for records, signaling serious scrutiny beyond a simple audit.
If you owe a tax debt and can't pay all or part of it, the IRS can help. You have options to resolve your tax bill.
The IRS and its authorized private collection agencies will never ask a taxpayer to pay using any form of pre-paid card, store or online gift card. Taxpayers can review the IRS payments page at IRS.gov/payments for all legitimate ways to make a payment.
IRS Warning Signs of Federal Tax Evasion
The IRS can't seize certain personal items, such as necessary schoolbooks, clothing, undelivered mail and certain amounts of furniture and household items.
The IRS e-file shutdown 2025 begins on Friday, December 26, 2025, at 11:59 A.M. Eastern Time. During this annual maintenance period, the IRS takes its electronic tax filing system offline to update systems and prepare for the new tax year. The IRS announced it will officially reopen e-file on January 26, 2026.
The IRS doesn't have a strict maximum time limit for issuing refunds, but generally processes e-filed returns with direct deposit within 21 days, while paper returns take 6 weeks or more, with longer waits for those claiming certain credits (EITC/ACTC) or if errors occur. If the IRS holds your refund for more than 45 days past the tax deadline (or filing date if late), they owe you interest, but significant delays (months) can happen for complex issues or extra reviews, sometimes requiring a mailed notice.
You generally shouldn't worry if your refund is "still being processed," as it means the IRS is working on it, but it might take longer than the typical 21 days due to common issues like errors, incomplete information, or claiming credits like the EITC/ACTC. Worry only becomes necessary if you receive an IRS letter requesting more information or if the "Where's My Refund?" tool shows a specific problem like fraud, but typically, it just means a longer wait, not no refund at all.