LT16: What It Means and How to Respond

What the notice actually says

The IRS titles this notice "Your account has been assigned for enforcement action — Please call us about your unpaid taxes." It is the Automated Collection System (ACS) telling a taxpayer, bluntly, that the account has moved to a next step: "We have assigned your account for review and possible enforcement action. Enforcement action may include seizing your wages or property." Then: "It's important that we hear from you within 10 days." IRS.gov's own summary of the notice covers the same ground in plain language, without adding a day count of its own.

What LT16 does not do is levy anything, and — this is the single highest-value fact on this page — it does not satisfy IRC §6331(d)'s notice-of-intent-to-levy requirement or open a Collection Due Process hearing window. The notice's own penalty-computation language gives this away: it treats a Notice of Intent to Levy as a distinct, later event — "If we issue a Notice of Intent to Levy and you don't pay the balance due within 10 days of the date of the notice, the penalty for paying late increases to 1% per month." LT16 is warning a taxpayer where the account is headed, not announcing that it has arrived. (For where LT16 sits among the notices that do carry that authority, see the IRS Notice Library.)

What actually triggered it

LT16 goes out when ACS has flagged an account for one or both of two reasons: an unpaid balance that has aged without a resolution in place, or one or more returns still missing from the account. The sample notice IRS.gov publishes uses payroll tax (Form 941) periods as its example, but the notice isn't limited to business accounts — anything ACS has queued for a next step can generate one. Because the notice text alone doesn't say whether you're looking at a balance problem, a filing problem, or both, pulling the account transcript before calling ACS is the practitioner's first move. It shows exactly which years are open, which returns are genuinely missing, and what the running balance actually is, so the call itself isn't spent discovering that information live with an ACS agent.

Response deadline and what happens if you miss it

The window is 10 days, not 30. That's a third of CP504's 30-day levy-warning clock and a third of the 30 days LT11, Letter 1058, or CP90 gives for a CDP hearing request, and the notice's "What you need to do" section wants a concrete response inside it: pay in full, or call with current monthly income and expense figures ready to discuss a payment plan.

Missing the 10 days does not itself trigger a levy or start a CDP clock — LT16 carries neither. The Taxpayer Advocate Service describes what actually follows in more open-ended terms: "If you choose not to respond to the Notice LT16, the IRS may send further taxpayer collection notices to you requesting payment for the tax balance owing. The IRS may also file a Notice of Federal Tax Lien or issue a levy." In practice, an unanswered LT16 moves the account further down the ACS queue toward the notices that do carry lien-filing and levy authority, rather than triggering either one by itself.

The practitioner's actual next step

Because LT16 asks for a call rather than a filing, be ready for that call before making it. ACS wants current monthly income and expenses on the phone to work out a payment plan, so run the numbers first — The Federal Tax Desk's IA Payment Calculator sizes a proposed installment agreement against the Internal Revenue Manual's own installment-agreement standards (IRM 5.14) before you or the client is on hold with ACS.

Confirm what actually triggered the notice before anything else — a balance problem and a missing-return problem call for different first moves, and LT16's own text doesn't say which one you're facing. Filing a missing return can resolve an LT16 that has nothing to do with an existing balance. And because ACS-worked accounts can still escalate to a Revenue Officer, treat a client's LT16 as the moment to get ahead of the case rather than the moment to wait and see what a later notice ends up saying.

What LT16 gets confused with — and why the distinction matters

LT16's own language — "assigned for enforcement action," "seizing your wages or property" — reads more severe than its actual legal effect, and that gap leads practitioners to treat it like CP504 or worse. It's neither. CP504 is itself the IRS's chosen vehicle for satisfying §6331(d): its own heading calls it a Notice of Intent to Levy, and it opens the door to a state-refund levy under the State Income Tax Levy Program. LT16 doesn't do that — its own text treats a Notice of Intent to Levy as something the IRS might issue later, not what this notice is.

LT16 also carries none of what LT11, Letter 1058, and CP90 carry: no §6331(d) notice, no Collection Due Process hearing right, no Form 12153 window. IRC §6330(a) requires written notice of the right to a hearing at least 30 days before a levy; IRC §6331(d) requires that same 30-day advance notice of the intent to levy itself. LT16 satisfies neither requirement, and nothing about answering or ignoring it starts or stops a CDP clock. A client who calls and resolves an LT16 hasn't used up any appeal right; a client who ignores it hasn't lost one — that authority and those rights are still tied to whichever later notice actually issues.

IRS.gov's summary page does mention a right to a hearing with the Office of Appeals, but only for a taxpayer who disputes the tax itself, not a Collection Due Process hearing tied to a levy. Treating that general Appeals right as equivalent to CDP is its own mistake — they're different processes with different triggers, and only one of them attaches to LT16.