The IRS (https://www.irs.gov/help/how-to-know-its-the-irs) almost exclusively initiates contact regarding audits or tax issues through official correspondence delivered by the U.S. Postal Service, never via email, text, or social media. An audit notice (often CP05) will detail the specific issues, requested documents, and deadlines.
A letter or notice is the first way the IRS will contact a taxpayer. There are a few ways a taxpayer can check to see if it's really the IRS: Log in to their secure IRS Online Account to see if the letter or notice is in their file. Review common IRS letters and notices: Understanding Your IRS Notice or Letter.
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.
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.
Remember, you will be contacted initially by mail. The IRS will provide all contact information and instructions in the letter you receive. If we conduct your audit by mail, our letter will request additional information about certain items shown on the tax return such as income, expenses, and itemized deductions.
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 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.
Filers most commonly receive letters from the IRS notifying them of the examination in the fall or winter months of the previous tax filing year. Yet, the auditors can mail the notifications throughout the year.
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.
The IRS may levy (seize) assets such as wages, bank accounts, Social Security benefits, and retirement income. The IRS also may seize your property (including your car, boat, or real estate) and sell the property to satisfy the tax debt.
The IRS 3-year rule generally refers to the statute of limitations for claiming a tax refund, which is typically 3 years from when you filed your original return or 2 years from when you paid the tax, whichever is later, for the IRS to process your claim. For an audit, the IRS generally has 3 years from the date your return was filed or due (whichever is later) to assess additional tax, though this can extend to 6 years if you significantly underreport income or omit foreign income.
Mail audits are usually quick and straightforward
The IRS does these audits by mail, generally notifying taxpayers within seven months of filing. Mail audits usually wrap up within three to six months, depending on the issues involved and how quickly and completely you respond to the audit letter.
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.
A search warrant is one of the clearest (and most alarming) signs that the police are investigating you or something connected to you. To get that warrant, law enforcement had to convince a judge that there's probable cause to believe evidence of a crime is at your location.
Most investigations begin when someone (an employee, manager, or even a client) reports conduct that breaks the rules. Common triggers for workplace investigations include: Harassment or discrimination complaints. Allegations of theft or fraud.
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.
Here's a list of seven symptoms that call for attention.
The IRS 7-year rule primarily applies to keeping records for claiming a deduction for bad debts or losses from worthless securities, allowing a longer period to file for a credit or refund, but it's not a universal audit limit; it's often a recommended safe buffer for general record-keeping, with the standard IRS audit period usually being 3 years, extending to 6 years for substantial income omission (over 25%) or foreign income issues, and indefinitely for fraud.
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.
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.