Final stage — a right expires here
IRS Notice CP508C: What It Means and What to Do
Your tax debt has been certified as seriously delinquent — and the State Department has been told.
What this notice is
CP508C tells you the IRS has identified your tax debt as meeting the definition of 'seriously delinquent' in Internal Revenue Code section 7345, and has given that information to the State Department.
The deadline
There is no appeal window printed on this notice. What matters is resolution: the IRS reverses the certification within 30 days of the tax problem being resolved and notifies the State Department.
What happens if nothing is done
The State Department is generally prohibited from issuing or renewing a passport for a taxpayer with a seriously delinquent tax debt, and may revoke one.
Your options
- Pay the balance in full.
- Enter into an installment agreement or an accepted offer in compromise — arrangements of that kind take the debt outside the certification.
- Check whether an exclusion applies: the IRS lists debt connected to a levy for which collection is suspended by a timely requested or pending CDP hearing under IRC 6330.
The part people get wrong
The reversal is not instant. The IRS gives itself 30 days after the problem is resolved to reverse the certification, and then the State Department has its own process. If travel is booked, that timeline is the thing to plan around.
Where this notice sits
The IRS collection sequence runs roughly in this order. Notices can arrive out of order or be skipped, so treat this as the shape of the process, not a timetable.
- 1CP14The first bill. The IRS says you owe money on unpaid taxes.
- 2CP501A reminder that you still have an unpaid balance on one of your tax accounts.
- 3CP503The second reminder. The IRS has still not heard from you.
- 4CP504Notice of Intent to Levy. The tone of the sequence changes here.
- 5CP523Your installment agreement is about to be terminated.
- 6LT11 / Letter 1058The final notice before seizure — and the one with a 30-day clock on your appeal right.
- 7CP90Final notice of intent to levy, with notice of your right to a hearing.
- 8CP508C — you are hereYour tax debt has been certified as seriously delinquent — and the State Department has been told.
Two notices sit outside this sequence: CP2000 proposes a change and is not a bill, and CP49 reports that a refund was already applied to a debt.
Every statement on this page comes from the IRS's own page for this notice, read on 2026-09-01. Where the IRS does not state something — a fixed number of days, for instance — this page does not state it either.
If you owe the money
Interest runs at 7% a year, compounded daily, and the failure-to-pay penalty adds 0.5% of the unpaid tax for each month or part of a month. An approved payment plan halves that penalty to 0.25%. On a $10,000 balance carried for a year the difference is $300 — for a step that costs nothing today.
IRS Fresh Start
Payment plans and what they change
Penalty Abatement
When the IRS removes penalties
Tax Debt Forgiveness
What is real and what is marketing
Currently Not Collectible
When you genuinely cannot pay
When Collection Rights Expire
The ten-year clock
Wage Garnishment Calculator
What a levy leaves you
Other IRS notices
CP14
The first bill. The IRS says you owe money on unpaid taxes.
CP501
A reminder that you still have an unpaid balance on one of your tax accounts.
CP503
The second reminder. The IRS has still not heard from you.
CP504
Notice of Intent to Levy. The tone of the sequence changes here.
LT11 / Letter 1058
The final notice before seizure — and the one with a 30-day clock on your appeal right.
CP90
Final notice of intent to levy, with notice of your right to a hearing.
CP523
Your installment agreement is about to be terminated.
CP49
Your refund was used to pay a tax debt.
CP2000
Not a bill. The income reported to the IRS does not match your return.
This page is for general information only and is not tax or legal advice. Settlement Insight is not a law firm, is not a tax representative and does not represent any party. Consult a licensed tax professional or attorney about your specific notice.