Yes, the IRS sends warnings through official letters and notices sent via mail regarding tax issues, penalties, or, in serious cases, intent to levy assets. These, such as CP504 or CP523 notices, warn of impending action, allowing taxpayers to resolve issues first.
But nothing should happen without warning. In general, the IRS has to notify you with a letter before it takes any of these actions. Here are some common questions about what the IRS can do, what happens before and after the IRS acts, and what you should do to resolve the problem. Can the IRS take or hold my refund?
Should your account be selected for audit, we will notify you by mail. We won't initiate an audit by telephone. Assistance is available to help you understand the letter/notice received: Understanding your IRS notice or letter.
The IRS uses a combination of automated and human processes to select which tax returns to audit. 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.
Notice of Tax Due and Demand for Payment, Notice CP14, Balance Due $5 or More, No Math Error, is the first and most common notice sent to taxpayers.
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.
The IRS and authorized private debt collection agencies do send letters by mail. Taxpayers can also view digital copies of select IRS notices by logging into their IRS Online Account.
IRS Warning Signs of Federal Tax Evasion
Revenue agents – examinations (audits)
They may meet you at an IRS office or visit your home, business or accountant's office. A visit may require a tour of your business or your authorized power of attorney. Before a visit: The agent contacts you by mail. After, they may call to discuss your audit.
And depending on the type of debt, in many situations the IRS is legally required to forward your refund to pay the debt. You receive a notice or letter from the IRS about a balance due on your account, missing returns, a lien, or a levy.
Notices – The IRS will start sending you notices a month or two after you miss a tax deadline. Penalties and interest – If you don't respond to notices for missed tax payments, you'll continue to accrue penalties and interest.
Most IRS letters and notices are about federal tax returns or tax accounts. Each notice deals with a specific issue and includes specific instructions on what to do. Don't panic. The IRS and its authorized private collection agencies do send letters by mail.
IRS audits are triggered by discrepancies the IRS's automated systems catch, like unreported income from 1099s, claiming excessive deductions (charity, business meals, home office) compared to your income bracket, large business losses, math errors, significant income jumps, or claiming hobby losses as business expenses, with higher-income earners generally facing more scrutiny.
The "20k rule" refers to the traditional IRS threshold for reporting income from payment apps and online marketplaces on Form 1099-K: over $20,000 in gross payments AND more than 200 transactions in a calendar year. While a law (the American Rescue Plan) temporarily lowered the threshold to $600, recent legislation, the One Big Beautiful Bill Act (OBBBA) (OBBBA), has reinstated the $20,000/200-transaction rule for tax years starting in 2025, providing relief for casual sellers and gig workers.
Reporting cash payments
A person must file Form 8300 if they receive cash of more than $10,000 from the same payer or agent: In one lump sum. In two or more related payments within 24 hours. For example, a 24-hour period is 11 a.m. Tuesday to 11 a.m. Wednesday.
If the deductions, losses, or credits on your return are disproportionately large compared with your income, the IRS may want to take a second look at your return. Taking a big loss from the sale of rental property or other investments can also spike the IRS's curiosity.
The IRS escalates its collection efforts when the amount owed exceeds $25,000, which can result in severe penalties such as asset seizure, bank levy, wage garnishment, and even passport revocation. If you're unsure how much you owe, you can find more information and guidance here.
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.
The government has no legal obligation to notify you that you're under investigation. There is no constitutional right to know that prosecutors are building a case against you.