IRS Audit: What Happens If You Ignore It

The IRS sends notices in envelopes that look like junk mail. It's possible you've thrown one away by mistake — or tossed it in a pile and forgotten about it. Possible. But not a situation you want to let continue.

Ignoring the IRS is never the right strategy. The agency doesn't need your cooperation to act against you. It just needs time.

The First Letter: A Proposal, Not a Bill

Most "audits" begin as correspondence audits — the IRS sends a letter proposing changes to your return based on an information mismatch (typically, income reported to the IRS by an employer, bank, or brokerage that doesn't match what you reported). The most common is a CP2000 Notice.

This initial letter is not yet a bill. It's a proposal. You have 30-60 days to respond with a correction, explanation, or supporting documentation. If you respond promptly with good records, these cases often close without any change. Many CP2000 notices result from simple mismatches easily explained — a 1099 reported under a slightly wrong Social Security number, or income you reported on a different line. But if you ignore it, the escalation begins automatically.

The 30-Day Letter, Then the 90-Day Letter

If you don't respond to the initial notice, the IRS sends a 30-day letter proposing the deficiency and giving you one more chance to respond or file a petition with the U.S. Tax Court. If you ignore that too, you receive the Notice of Deficiency — the "90-day letter." This gives you 90 days to petition Tax Court. If you file a petition, the assessment is on hold while your case is reviewed. If you ignore it, the IRS automatically assesses the deficiency.

Now it's a tax debt — with interest from the original due date of the return, plus failure-to-pay penalties (0.5% per month, up to 25%) and failure-to-file penalties (5% per month, up to 25%). Combined, you can hit 47.5% of the original tax owed in penalties alone, before interest — currently running at 7-8% per year. A $10,000 tax bill becomes $15,000-$18,000 fairly quickly once this math starts.

What the IRS Can Do Without Going to Court

After assessment, the IRS has collection tools that don't require a court order. Tax liens are public records that attach to your property, hurt your credit score, and must be satisfied before you can sell or refinance your home. Bank levies let the IRS contact your bank directly — the bank freezes your funds, and 21 days later sends them to the IRS. No advance notice to you required.

Wage garnishment is ongoing — the IRS contacts your employer and takes a portion of every paycheck until the debt is paid. Your employer is legally required to comply and has no ability to protect you from it. The IRS can also claim up to 15% of your Social Security benefits, and for seriously delinquent tax debt over $62,000, the State Department can revoke or deny renewal of your passport.

Criminal Liability: The Extreme End

Failing to file a tax return is a misdemeanor — up to one year in federal prison per year of unfiled returns. Tax evasion (active concealment of income or assets) is a felony with up to five years per offense. Most non-filers don't end up prosecuted — the IRS focuses criminal enforcement on clear fraud, not simple failures to file. But the IRS Criminal Investigation division handles over 3,000 referrals for prosecution annually. It's not theoretical.

What to Do If You're Already Behind

The good news: the IRS responds much better to proactive engagement than to people who wait to be forced. People who come in voluntarily — before a levy, before criminal referral — have far better outcomes.

Options available to you: installment agreements (pay over up to 72 months, typically without wage garnishment while you're compliant), Offer in Compromise (settle your debt for less than you owe if you qualify based on ability to pay), Currently Not Collectible status (if you truly have no ability to pay, the IRS suspends collection while your situation changes), and first-time penalty abatement for filers who missed one year but are otherwise compliant.

A tax attorney or enrolled agent can assess your situation and identify the best resolution path. Acting before the IRS escalates to levies gives you the most options. One letter doesn't have to become a federal crisis. But ignoring it is the one guaranteed way to get there.