IRS LT16: request to contact the IRS — unpaid tax or missing returns

LT16 is issued by the IRS's Automated Collection System when your account has unpaid balances or delinquent returns and earlier notices haven't resolved it. The IRS says following the letter's instructions may stop enforcement action. You generally must be current on all required filings to qualify for an installment agreement, so missing returns are usually step one. See unfiled tax returns.

Balance-due reminders come in a predictable order: CP14 first, then CP501, CP503 and CP504. After that, the IRS issues a final notice of intent to levy — LT11 or Letter 1058, or CP90/CP297 for certain federal payments — which carries Collection Due Process (CDP) hearing rights. CP504 itself is not a CDP notice.

Scam letters copy IRS formatting, so confirm a LT16 before acting on it. Log in to your IRS Online Account — most notices, balances and payment history appear there — or request an account transcript. A genuine notice shows a notice or letter number (usually in the top or bottom right corner), the tax year, and explains your rights. If you call, use a number you find on IRS.gov, not a number printed only on a letter you're unsure about. The IRS doesn't demand payment by gift card, prepaid debit card, cryptocurrency or wire to an individual, and it doesn't threaten immediate arrest.

Respond by the date in the letter. It isn't itself a CDP levy notice, but it signals that one — or a lien — may come next.

Compare the notice with your return and the payments listed on it. If a payment is missing or the math looks wrong, contact the IRS at the number on the notice (or one listed on IRS.gov) by the date shown, with proof such as bank statements or a canceled check. Disputing the underlying tax usually means filing an amended return, requesting audit reconsideration, or asking for penalty relief.

The IRS may file a Notice of Federal Tax Lien, which can affect credit and borrowing, and move to levy after issuing the required final notice. Missing returns can be filed for you by the IRS as a substitute for return, typically without the deductions you'd claim.

If you owe and can't pay in full, you have options:

• Pay in full online through IRS Direct Pay or your Online Account to stop further interest and penalties.
• Short-term plan of up to 180 days, with no setup fee.
• **Installment agreement** — individuals who owe $50,000 or less in combined tax, penalties and interest can usually apply online. Larger balances generally need a financial statement (Form 433-F or 433-A).
• **Currently Not Collectible** status if paying would prevent you from covering basic living expenses.
• **Offer in Compromise** only if you can't realistically pay the full amount before the collection statute expires — most applicants don't qualify.
• **Penalty relief**, including first-time abatement, which can remove failure-to-file and failure-to-pay penalties.

Interest (currently 7% a year, set quarterly) continues on any unpaid balance.

You don't need to pay anyone to respond to a LT16. The Taxpayer Advocate Service, an independent organization inside the IRS, helps people whose problems aren't being resolved through normal channels or who face significant hardship. Low Income Taxpayer Clinics offer free or low-cost representation to eligible taxpayers, including in disputes with the IRS. Volunteer programs such as VITA can help prepare missing returns. If you do hire paid help, choose a credentialed professional — a CPA, enrolled agent or attorney — who can represent you before the IRS with Form 2848, and be wary of anyone who guarantees an outcome, demands large upfront fees, or tells you to stop communicating with the IRS. See red flags to watch for.

1. Read the whole notice and note the date, tax year and any deadline.
2. Verify it in your IRS Online Account or with a transcript.
3. Gather records — the return, payment proof and any documents the notice mentions.
4. Decide: agree and pay/verify, dispute with documentation, or request the hearing or appeal the notice describes.
5. Respond in writing or by the method shown, before the deadline, and keep copies and proof of mailing.
6. Get help if needed. You can authorize a CPA, enrolled agent or attorney with Form 2848, and the Taxpayer Advocate Service or a Low Income Taxpayer Clinic may help for free.

Want to see which relief options fit your situation? The free calculator on this page takes about a minute. It's an educational estimate, not a guarantee.