IRS Notices

IRS LT16 Notice: What It Means, Your Deadline, and What to Do (2026)

By Angeline Balsitis, EA · Reviewed by Melissa Ly, Chief Tax Officer · Updated June 19, 2026 · Editorial Standards

Why you got an LT16 notice

An LT16 notice goes out when your account has been handed to the IRS's Automated Collection System, often called ACS. The IRS sends it for one of two reasons — sometimes both at once: you have a balance the IRS says you owe and haven't paid, or there's a tax return the IRS expected from you that it never received.

The notice is short and direct. It asks you to call a phone number to "resolve" the account. What it doesn't spell out is everything else you can do instead of, or alongside, that call. We'll get to those options below.

One thing to be clear about: an LT16 is a collection notice, not an audit and not a final levy notice. Nobody is questioning your deductions, and no money is being seized today. But the account is active in an automated system, and that system doesn't forget about you.

What happens if you ignore it

The danger with an LT16 isn't the letter itself — it's what comes next if you do nothing. The IRS collection sequence is automated, and each step carries more enforcement power than the last:

1. LT16 — please call us about overdue taxes or an unfiled return. You are here. No levy yet.
2. Reminder and balance-due notices — the balance keeps growing with monthly penalties and interest.
3. CP504 / Notice of Intent to Levy — the IRS can seize your state tax refund and a federal tax lien becomes a real possibility.
4. LT11 / Letter 1058 — Final Notice of Intent to Levy — after 30 days, the IRS can garnish wages and levy bank accounts. You get formal appeal rights here, but far fewer easy options than you have today.

In 2026 this matters more than ever: IRS staffing is stretched thin, but the notices, liens, and levies are generated by computers that didn't get cut. The machine keeps escalating whether or not a person ever looks at your file. Acting now, while you're holding the LT16, is the cheapest and calmest point to fix this.

First: check whether the LT16 is actually right

Before you pay or panic, spend ten minutes confirming what the IRS thinks is wrong:

• Log into your IRS online account and look at your balance and your list of filed returns. This tells you exactly which years show a balance and which returns show as missing.
• Match it to your records. If the LT16 is about an unfiled return, did you actually file that year? Returns can be logged late or recorded under the wrong year. If it's about a balance, recent payments can cross in the mail with the notice.
• Screen for scams. A real LT16 arrives by postal mail, never by email, text, or social media. Real IRS payments go only to the United States Treasury or through IRS.gov — anyone demanding gift cards, wire transfers, or payment apps is a criminal, not the IRS. Our guide on how to tell if an IRS letter is real walks through the checks.

If the notice is about a return you already filed, send the IRS a signed copy with proof of mailing or your e-file confirmation. Don't assume the system will catch up on its own.

If you can't pay in full: your real options after an LT16

The notice makes it sound like there are two choices — call and pay, or face consequences. In reality the IRS has several programs, and which one fits depends on your finances:

• Short-term payment plan — up to 180 extra days to pay in full. No setup fee. Interest and penalties continue, but enforcement holds.
• Installment agreement — a monthly payment plan (details on the IRS payment plans page). For balances under about $50,000, "streamlined" agreements can usually be set up without detailed financial disclosure, spread over as long as 72 months.
• Currently Not Collectible status — if paying anything would create genuine hardship, the IRS can pause collection. The debt stays, but garnishments and levies stop while your situation is tight.
• Offer in Compromise — settling for less than the full balance. It's real, but only when your income and assets genuinely can't cover the debt; the IRS runs the math. An experienced tax professional can tell you whether you're actually a candidate before you spend time chasing it.
• Penalty relief — if this is your first slip in years, first-time penalty abatement can remove the failure-to-pay penalty (0.5% per month) entirely. Reasonable-cause relief may apply for illness, disaster, or other events beyond your control.

If the LT16 is about an unfiled return, that comes first. You usually can't set up a payment plan until the missing return is filed, because the IRS needs to know the real number before it can agree to anything.

How to respond to an LT16, step by step

1. Verify the issue against your IRS online account — is it a balance, a missing return, or both? (See the section above.)
2. File any missing returns first. If the LT16 names an unfiled year, prepare and submit that return so the IRS has an accurate figure to work with.
3. If you owe and can pay: pay by the notice date at IRS.gov/payments. That stops the penalties and the escalation immediately.
4. If you can't pay in full: pick the option above that fits and set it up before the deadline. Even a plan you start today prevents everything that follows.
5. If the notice is wrong: respond in writing or by phone with proof — proof of payment, proof of filing, or the corrected figures — and keep copies of everything.
6. If you owe more than $10,000, have several unfiled years, or just want it handled: get a professional review first. The order you fix things in — returns, then penalties, then the balance — changes what you end up paying. You can also have a representative deal with the IRS for you under a power of attorney.

LT16 notice questions, answered

This guide is general information, not tax or legal advice for your specific situation. Eligibility for IRS programs depends on individual facts and circumstances; no outcome is guaranteed.

Related: see our guides on the CP504 Notice of Intent to Levy and the LT11 Final Notice — the steps that follow if an LT16 goes unanswered — or why you got a letter from the IRS. You can also browse all guides.