Every tariff refund story starts and ends with the same clock. When Customs and Border Protection liquidates an import entry, an importer has exactly 180 days to file a protest. On day 181, the protest right is gone. There is no extension, no waiver, and no hardship exception. For importers looking to recover IEEPA duties that the Supreme Court ruled unlawful in February 2026, this is the deadline that quietly destroys claims.
This post explains what liquidation means, how the 180-day rule works, what happens when an entry becomes “final,” and why the recent CAPE refund mechanism does not replace the protest channel for entries close to the deadline.
What liquidation actually is
When goods enter the United States, duties are paid based on information the importer provides — classification, value, country of origin. CBP does not audit every entry at the moment of import. Instead, it reserves the right to review, adjust, or confirm the duty later. Liquidation is the moment CBP says, in legal effect: this entry is closed, the duty we recorded is the duty we keep.
Liquidation is not a payment event. No money changes hands at liquidation — the importer already paid the duties at entry. What changes is the status of the entry. Before liquidation, CBP can unilaterally adjust the duty up or down. After liquidation, that window closes, and the importer’s only remedy is to protest.
Most entries liquidate on a predictable timeline set by 19 U.S.C. § 1504. The default is one year after entry, and CBP can extend liquidation by up to three years for cause. Some entry types liquidate sooner — Type 11 entries, for example, are self-liquidating and close on a much faster schedule. Knowing when your entries liquidated matters because the 180-day clock runs from that specific date.
The 180-day rule, verbatim
The protest deadline is set by 19 U.S.C. § 1514(c)(3), which provides that a protest must be filed within 180 days after the date of the decision protested (in practice, the liquidation date).
The statute does not give CBP discretion to accept late protests. Courts have consistently treated the 180-day window as jurisdictional, meaning a late-filed protest is not just denied — it is treated as a filing CBP never had authority to consider. The only recognised adjustment is that when day 180 falls on a weekend or federal holiday, the deadline rolls to the next business day.
Working the math backwards
The practical version of this is simple arithmetic. For any entry:
Protest deadline = Date of liquidation + 180 days
If an entry liquidated on, say, November 15, 2025, the protest deadline is May 14, 2026. An entry that liquidated on October 1, 2025 has already passed its deadline (March 30, 2026). An entry that liquidated on January 15, 2026 has until July 14, 2026 — still comfortably inside the window.
What matters is that an importer needs the liquidation date for every affected entry, and a bulk view of how those dates map to deadlines. A business importing weekly through 2025 may have a hundred or more entries in the IEEPA tariff period, each with its own deadline, and the deadlines roll forward day by day. Entries with deadlines in the next 30 to 60 days are the ones that need attention first.
“Finality” is a broader question than the 180 days
Here is a piece of nuance that most tariff-refund coverage glosses over. The 180-day protest window closes the protest channel. It does not necessarily close every channel for a refund.
There are at least two separate deadlines in the relevant statutes:
- 90 days under 19 U.S.C. § 1501, which governs voluntary reliquidation — the period during which CBP can, on its own motion, reliquidate an entry to correct an error
- 180 days under 19 U.S.C. § 1514, which governs the importer’s protest right
For CAPE refund purposes — CBP’s new consolidated IEEPA refund mechanism — which of these windows defines “finality” is a question CBP has not fully resolved. A conservative reading treats the 90-day window as the binding one for the voluntary-reliquidation path, and the 180-day window as the binding one for protests. A less conservative reading treats the 180-day window as the effective outer limit for any refund.
The reason this matters is that an importer who waits for CAPE to come online, rather than protecting their entries through a protest, is betting on the less conservative interpretation. If CBP ultimately decides that entries past the 90-day mark are final for CAPE purposes, the importer who filed a protest at day 170 has a live claim and the importer who did not has nothing.
We cover this argument in more detail in the protest-as-insurance post. The short version: protest now, then also pursue CAPE. You do not have to choose.
What happens on day 181
If an importer does not file a protest before the 180th day, the entry is closed to a protest challenge. The legal terminology is that the entry has become final. Practically, that means:
- CBP will not accept a Form 19 filing on that entry as a protest
- The importer cannot appeal a denial because there is nothing to deny
- The duty record on that entry stands as CBP recorded it at liquidation
Whether a late entry can still be recovered through CAPE is the unresolved question above. The safe assumption — the one an importer should plan around — is that a missed protest deadline means a lost claim.
Self-liquidating entry types and the fast clock
Not every entry follows the default one-year liquidation timeline. Type 11 informal entries, for example, self-liquidate on a much shorter schedule. Entries that are self-liquidating may have already passed their protest window by the time an importer begins reviewing their IEEPA exposure. If you deal in informal entries, assume the clock moves faster than you remember and check the liquidation dates first before planning anything else.
The practical discipline
The thing to internalise is that the 180-day deadline is not a soft recommendation. It is a jurisdictional wall. Every day an importer waits to begin reviewing their entries is a day that may drop a few more entries out of the eligible pool. The cost of reviewing entries early is trivial. The cost of reviewing them late is the refund.
A workable discipline:
- Pull the full list of entries from your customs broker for the IEEPA tariff period (2025 through early 2026)
- For every entry, record the liquidation date
- Compute deadline = liquidation date + 180 days
- Sort ascending by deadline. Address the top of the list first.
If the list is long — and for any importer who paid IEEPA duties on Chinese or Hong Kong goods through 2025, it almost certainly is — a protest generator that can handle batches of entries at a flat fee per entry is a better fit than a broker’s percentage cut. That is what Tariff Spot exists to do.
Stop guessing at the deadline and start working down the list. Start a refund claim — the form walks you through it one entry at a time, flagging entries that are already critical.