Notice of Deficiency — the 90-Day Letter (Letter 3219)

Why you might get this

• You didn't respond to an earlier notice like a CP2000 or an audit.
• The IRS finalized proposed changes to your return.
• You and the IRS still disagree about income, deductions, or credits.

The deadline

You have exactly 90 days (150 days if the notice is addressed to you outside the U.S.) to file a petition in U.S. Tax Court. This deadline is set by law and cannot be extended — miss it and you lose the right to dispute before paying.

What to do

1. Find and note the exact last date to petition — it's printed on the notice.
2. Decide whether you agree or disagree with the proposed tax.
3. If you disagree, file a petition with the U.S. Tax Court before the 90-day deadline.
4. Strongly consider hiring a tax professional or tax attorney right away.
5. If you agree, sign and return the enclosed waiver (Form 5564) and arrange payment.

What happens if you ignore it

After 90 days, the IRS can legally assess and bill the full tax, penalties, and interest. Your remaining options then require paying first and seeking a refund afterward.

Letter 3219 follows an unanswered CP2000/CP2501 or audit; after the 90 days, the balance enters the collection chain (CP14 → CP501 → CP503 → CP504 → LT11/CP90).

What the IRS Letter 3219 (Notice of Deficiency) means

Letter 3219 is the "Notice of Deficiency," better known as the 90-day letter — and it is one of the most legally significant notices the IRS sends. It's the formal statement that the IRS believes you owe more tax, usually after an earlier notice like a CP2000, or an audit, went unresolved.

What makes this letter so important is the door it opens and the clock it starts. You have exactly 90 days from the date on the notice (150 days if it's addressed to you outside the United States) to file a petition in the U.S. Tax Court. Tax Court is the one place you can dispute the proposed tax before paying it. This deadline is written into law — the IRS cannot extend it, and neither can you.

If you miss the 90 days, the IRS can formally assess the tax, penalties, and interest, and your only remaining path is generally to pay the bill and then sue for a refund. That's a far harder and costlier road.

Because the stakes and the rules are so specific, this is the notice where professional help matters most. Many people bring in a tax attorney or an enrolled agent the moment it arrives.

Solace treats jurisdiction-losing statutory deadlines like this 90-day window as the highest priority, so the single most important date on the letter never slips past you.