IRS notice, decoded

CP508C: Certification of Seriously Delinquent Tax Debt to the State Department

What it is

A certification, not a new bill. The IRS has certified to the U.S. Department of State that you owe 'seriously delinquent tax debt' under IRC §7345 — legally enforceable, unpaid, assessed federal tax debt (including penalties and interest) above the inflation-adjusted threshold, currently more than $66,000 for 2026. Once certified, the State Department generally will not issue you a passport, and it may deny a pending passport application or revoke the passport you already have. If you are overseas, it may issue a limited-validity passport good only for direct return to the United States.

Why you got it

Sent when your debt met the statutory definition: above the threshold, AND either a Notice of Federal Tax Lien was filed with the §6320 hearing rights lapsed or exhausted, or a levy was issued. Debts being paid timely under an IRS-approved installment agreement or accepted offer in compromise, debts with a timely-requested Collection Due Process hearing on the levy, and debts suspended for an innocent spouse request are excluded from certification, along with child support, FBAR penalties, and DOJ settlement agreements.

The deadline structure

CP508C does not open a fixed response window — the certification stays in place until the debt is resolved or the certification is shown to be erroneous. Two clocks do matter: if the State Department denies a passport application because of the certification, it holds the application open for 90 days so you can resolve it; and once the debt is resolved, the IRS says it reverses the certification within 30 days and notifies the State Department (you then receive notice CP508R). For imminent international travel within 45 days, the IRS can generally shorten decertification processing from 30 days to 9–16 days — it requires proof of travel and a State Department denial letter dated within the last 90 days.

If your notice prints a date, that printed date controls. There is no Collection Due Process hearing clock attached to CP508C itself — don't wait for one to start.

How to respond

Pay the balance in full, or arrange to pay over time — a timely-paid, IRS-approved installment agreement or an accepted offer in compromise takes the debt out of 'seriously delinquent' status
Call the number printed on the notice if you have questions or disagree that you owe the debt
If you believe the certification is erroneous or the IRS failed to reverse it, the review path the IRS describes is a civil action in the U.S. Tax Court or a U.S. District Court — not a CDP hearing

What ignoring it leads to

The certification stands. The State Department generally will not issue you a passport while you're certified, may deny a pending application after the 90-day hold runs out, and may revoke your current passport. The underlying lien or levy collection continues on its own track — this notice sits on top of that, it doesn't replace it.

Next letter if nothing changes: CP508R (notice that the certification was reversed) once the debt is resolved or the certification is found erroneous

First: make sure this notice is really from the IRS

The real CP508C arrives by regular mail — the IRS does not call, text, or email to tell you your passport is being revoked
'Pay right now by gift card, wire transfer, or crypto or lose your passport tonight' is a script — the IRS never demands those payment methods
The IRS does not threaten immediate arrest or deportation over the phone; passport-threat robocalls are a classic impersonation scam
Only the State Department — never a caller — denies, revokes, or limits passports, and a denied application comes with a 90-day window to resolve the certification
To verify a notice independently, call the IRS main line at 800-829-1040 or look the notice up at irs.gov — not any number from a call, email, or text

Mistakes people make with a CP508C

Waiting for a Collection Due Process hearing offer — CP508C itself carries no CDP right. The lien and levy notices behind it carried their own hearing rights; for the certification itself, the IRS describes a court action (Tax Court or district court), not a hearing
Assuming the IRS took your passport — the IRS only certifies the debt; the State Department is the agency that denies, revokes, or limits passports
Paying the debt just below the threshold and expecting automatic decertification — the IRS's published reversal conditions are full satisfaction (or legal unenforceability), a qualifying payment arrangement being paid timely, or an erroneous certification; paying below the threshold is not listed among them
Booking international travel while certified and hoping renewal goes through — if travel is within 45 days, the expedited path (9–16 days) exists, but it requires proof of travel plans and a recent State Department denial letter

Official sources

Our summary paraphrases these sources. Last verified: BUILD 2026-07-11 (Claude Fable 5; researched from live irs.gov fetches: irs.gov/individuals/understanding-your-cp508c-notice, irs.gov/businesses/small-businesses-self-employed/revocation-or-denial-of-passport-in-cases-of-certain-unpaid-taxes, irs.gov/individuals/understanding-your-cp508r-notice, law.cornell.edu/uscode/text/26/7345; $66,000 threshold is the 2026 figure from the passport page) — re-verify before launch. Your printed notice always controls.

NoticeKey is not affiliated with, or endorsed by, the IRS or any state tax agency.

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