You Missed the 90-Day Deadline. Now What?

You received a Notice of Deficiency. You had 90 days to petition the Tax Court. That deadline passed. The IRS has now assessed the tax against you.

This is not the outcome you wanted. But it's also not the end of your options.

Why the deadline matters

The Tax Court is the only place where you can challenge an IRS tax assessment before paying it. That's what makes the 90-day deadline so important—it's your ticket to a prepayment forum.

Once you miss it, the tax becomes officially assessed. The IRS can begin collection. And the Tax Court loses jurisdiction over your deficiency case. The court has no authority to extend this deadline, even for good reasons.

But "fewer options" is not the same as "no options."

Your remaining paths

Here's an overview of what's still available:

Let's look at each one.

Audit reconsideration

If you have information that wasn't considered during the original audit—or if you never responded to the audit at all—you can ask the IRS to take another look.

This is called audit reconsideration. It's an administrative process, not a court proceeding. The IRS explains it in Publication 3598.

When you can request it

• You didn't appear for the original audit
• You moved and never received IRS correspondence
• You have new documentation to support your position
• You disagree with the assessment

How to request it

1. Review the examination report to identify what you're disputing
2. Gather documentation that supports your position
3. Write a letter explaining your request
4. Include Form 12661 (Disputed Issue Verification) — recommended but not required
5. Mail everything to the IRS campus that handled your audit (addresses are in Publication 3598)

Important details

• There's no deadline—you can request audit reconsideration anytime while the tax remains unpaid
• If you've already paid in full, you must file Form 1040-X instead (that's an amended return, which is a different process)
• The IRS may (at their discretion) delay collection while reviewing your request
• If the IRS denies your request, you can appeal to the IRS Office of Appeals

Audit reconsideration won't get you into Tax Court. But it can get the IRS to reduce or eliminate the assessment without going to court at all.

Pay first, then sue (the Flora rule)

If you can't get relief administratively, there's still a path to court—but it requires paying the full assessed amount first.

This is called the Flora rule, from a 1960 Supreme Court case (Flora v. United States). The rule is simple: to sue for a refund in U.S. District Court or the U.S. Court of Federal Claims, you must pay the full tax first.

The process

1. Pay the full assessed tax (including penalties and interest)
2. File a claim for refund using Form 1040-X (for income tax)
3. Wait for the IRS to deny the claim (or wait 6 months with no response)
4. File suit in District Court or the Court of Federal Claims within 2 years of the denial

Why this matters

The Flora rule exists because Congress created the Tax Court specifically as a prepayment forum. If you miss that window, you're back to the traditional rule: pay first, litigate later.

For many people, this option is impractical. If you could pay the full amount, you probably would have already. But if you have the resources—or if the amount is small enough—this path preserves your right to have a judge review your case.

One advantage

In District Court, you can request a jury trial. Some taxpayers prefer having their case heard by a jury rather than a single judge.

CDP hearing: negotiating how you pay

When the IRS moves to collect—by filing a federal tax lien or threatening to levy your wages or bank accounts—it must give you notice and an opportunity to request a Collection Due Process (CDP) hearing.

A CDP hearing lets you negotiate with an independent Appeals officer about how you'll pay. You can propose alternatives like a payment plan, offer in compromise, or currently not collectible status.

What you generally cannot do in a CDP hearing

If you received a Notice of Deficiency and missed the 90-day deadline, you already had your opportunity to challenge whether you owe the tax. The CDP hearing won't reopen that question. You're limited to disputing collection issues, not the underlying liability.

How it works

1. You receive a Notice of Federal Tax Lien (Letter 3172) or Final Notice of Intent to Levy (Letter 1058 or LT11)
2. You have 30 days from the date of the notice to request a CDP hearing using Form 12153
3. Collection is paused while your hearing is pending
4. An Appeals officer reviews your proposed alternatives
5. If you disagree with the determination, you have 30 days to petition the Tax Court—but only on the collection issues, not the underlying tax

If you miss the 30-day window

You can request an "equivalent hearing" within one year. But equivalent hearings don't pause collection, and you can't petition the Tax Court if you disagree with the outcome.

Collection alternatives

Even if you can't challenge the underlying tax, you may be able to manage how you pay it. The IRS offers several programs:

Installment agreement

A payment plan that lets you pay over time. If you owe $50,000 or less, you can often set this up online at IRS.gov/payments. Interest and penalties continue to accrue until you pay in full.

Offer in compromise

A settlement where the IRS agrees to accept less than you owe. You must show that you can't pay the full amount through an installment agreement or asset liquidation. You can use the OIC Pre-Qualifier tool to check eligibility. There's a $205 application fee (waived for low-income taxpayers).

Currently Not Collectible status

If paying would prevent you from meeting basic living expenses, the IRS may place your account in "currently not collectible" (CNC) status. Collection activity stops, but interest and penalties keep accruing. The IRS will periodically review your financial situation.

One important note: the IRS generally has 10 years to collect a tax debt from the date of assessment. This is called the Collection Statute Expiration Date (CSED). If you're placed in CNC status, that clock keeps running—meaning you may eventually outlast the debt. But certain actions (filing an offer in compromise, requesting a CDP hearing, filing bankruptcy) can pause or extend the clock.

Penalty abatement

Even if you owe the tax, you may be able to reduce or eliminate penalties. Two common paths:

• First Time Abate: If you have a clean compliance history for the prior three years (filed all required returns, no penalties), the IRS may waive failure-to-file and failure-to-pay penalties as a one-time courtesy.
• Reasonable cause: If you can show you exercised ordinary care and prudence but couldn't comply due to circumstances beyond your control (serious illness, natural disaster, death in the family), the IRS may abate penalties.

You can request penalty abatement by calling the number on your notice or by filing Form 843.

Innocent spouse relief

If the tax liability stems from your spouse's or former spouse's actions on a joint return—and you didn't know about the errors when you signed—you may qualify for innocent spouse relief.

File Form 8857 within two years of the IRS's first collection attempt. The IRS will review your situation and may relieve you of some or all of the joint liability.

This is a separate issue from whether you missed the 90-day deadline. If the underlying problem is that your spouse understated income or claimed improper deductions, innocent spouse relief might be your real solution.

When to get professional help

You can handle some of these options yourself. Audit reconsideration, for example, is an administrative process that doesn't require representation.

But some situations call for professional help:

• Your case involves complex legal issues
• The amount at stake is significant
• You're considering an offer in compromise (acceptance rates are low without proper preparation)
• You're facing aggressive collection action
• You want to sue for a refund in federal court

Enrolled agents, CPAs, and tax attorneys can all represent you before the IRS. If your income qualifies, a Low Income Taxpayer Clinic may be able to help for free or low cost.

The bottom line

Missing the 90-day deadline closes the easiest door to challenging your tax bill. But it doesn't mean you're out of options.

Your next step depends on your situation:

• New evidence? Audit reconsideration may be an option.
• Can pay the full amount? The pay-and-sue route becomes available.
• Facing collection action? A CDP hearing lets you propose alternatives.
• Can't pay at all? Installment agreements, offers in compromise, or CNC status may apply.
• Hit with penalties? First Time Abate or reasonable cause relief may reduce them.
• Spouse caused the problem? Innocent spouse relief may apply.

The worst thing you can do is ignore the situation. IRS collection powers are substantial—wage garnishment, bank levies, property liens. Engaging with the process, even after missing a deadline, gives you the best chance of a manageable outcome.

This article is for informational purposes only and does not constitute legal or tax advice. If you're facing a tax dispute, consider consulting a qualified tax professional.