The LT11 is the IRS's legal completion of their notification requirement before active seizure. It is the official "Final Notice of Intent to Levy and Notice of Your Right to a Hearing" — and every word of that title matters.
The 30-day deadline is absolute. From the date printed on this notice, you have exactly 30 days to file IRS Form 12153 — a Request for a Collection Due Process Hearing. Filing this form immediately stops the levy. Miss the deadline and the IRS can move against your wages, bank accounts, and property without sending you another letter.
Here's what most people don't know: filing for a CDP hearing doesn't mean you're fighting the IRS in court. It means you're preserving your legal rights while a licensed professional negotiates on your behalf through the IRS Office of Appeals. The majority of cases filed at this stage are resolved through negotiation — never a formal hearing. But you have to file first.