What Happens If You Ignore an IRS Notice?

The IRS does not close a matter because a taxpayer does not respond. When a notice goes unanswered, the IRS typically proceeds as if the taxpayer agrees with its position — and the consequences of that assumption can be significant.

The specific outcome depends on what type of notice was ignored and how long it has been unanswered. But the general pattern is the same: the longer a notice goes without a response, the fewer options remain and the more difficult the situation becomes to resolve.

What Happens With a Proposed Change Notice (CP2000)

A CP2000 notice proposes a change to your return based on information the IRS received from third parties. If you do not respond by the deadline, the IRS treats the proposed change as accepted and issues a Notice of Deficiency — a formal determination that you owe the additional tax.

Once a Notice of Deficiency is issued, you have 90 days to petition the Tax Court if you disagree. If that window passes without action, the IRS assesses the tax and begins collection.

What Happens With a Balance Due Notice

Balance due notices follow a sequence. The IRS typically sends multiple notices — CP501, CP503, CP504 — with increasing urgency. If the balance remains unpaid and no arrangement is made, the IRS can:

• File a federal tax lien: A lien is a legal claim against your property. It attaches to all property you own and affects your ability to sell assets or obtain credit.
• Issue a levy: A levy is the actual seizure of property or funds. The IRS can levy bank accounts, wages, Social Security benefits, and other assets.
• Seize and sell property: In more serious cases, the IRS can seize and sell real property or business assets.

Interest and penalties continue to accrue on unpaid balances throughout this process.

What Happens With an Audit Notice

If you do not respond to an audit notice, the IRS examiner will typically make a determination based on the information available — which often means disallowing deductions or adjusting income without the benefit of your documentation. The result is usually a larger tax bill than if you had participated in the audit.

Why Responding — Even to Disagree — Matters

Responding to a notice does not mean agreeing with it. You can respond to say that you disagree, to provide documentation supporting your position, or to request more time. Any of these responses preserves your options and keeps the matter from escalating automatically.

The IRS has formal appeals processes, and many disputes are resolved at the administrative level without going to court. But those processes require that you respond within the specified timeframes.