Confirm the Liquidation Date Before the 180-Day Customs Protest Window Closes

The Signal

Every importer with a customs broker assumes someone is watching the clock on a disputed duty assessment. Usually no one is, because the clock doesn't start when you'd expect. If CBP liquidates an entry and assesses duties, fees, or a classification you disagree with, you don't get an open-ended window to fix it. Under 19 U.S.C. § 1514 and 19 C.F.R. § 174.12, you get 180 days from the date of liquidation to file a protest — and that liquidation date is a CBP bulletin-notice event, not the date your broker emails you the entry summary, not the date you noticed the charge on a statement, and not the date you got around to reviewing it. Miss the window and the assessment becomes, in the statute's own words, "final and conclusive upon all persons" — full stop, no further review, no second chance.

Why this matters now

Tariff volatility over the past two years has meant more entries liquidating at duty rates, classifications, or valuations companies didn't expect when the goods shipped. Every one of those liquidations starts its own 180-day protest clock the moment CBP posts the bulletin notice, whether or not anyone on your side opens the notice that day. Importers who rely on a broker's periodic summary — monthly, quarterly, whenever the broker gets to it — are trusting a reporting cadence to catch a legal deadline that doesn't wait for the next summary cycle. A broker relationship is a service, not a guarantee; the protest right belongs to the importer of record, and the importer of record is who loses it.

The mistake to avoid

The mistake is treating "liquidation" as a synonym for "the invoice I eventually got." They are not the same event, and the gap between them is exactly where protest rights disappear. CBP liquidates by posting a bulletin notice at the port, and 19 C.F.R. § 159.9 ties the legal date of liquidation to that posting — not to when a broker's software flags it, not to when an accounts-payable clerk reconciles a duty bill weeks later. A company that only checks its customs position when a bill looks wrong is checking too late by definition: by the time something "looks wrong" in a ledger, the 180-day clock may already be most of the way run, and nobody on the finance side was ever told the clock existed.

Where the 180-day clock actually starts

The rule changed in 2004, and plenty of internal compliance notes still reflect the old number. For entries liquidated before December 18, 2004, the protest window was 90 days. For anything liquidating on or after that date — which is every current entry — § 1514 and § 174.12 both set it at 180 days, measured from the date of liquidation or reliquidation itself, or from the date of a comparable decision such as an exaction, an exclusion-from-entry notice, or a denial of a Section 520(d) or 520(c)(1) claim. If your customs SOP, outside counsel memo, or broker agreement still cites "90 days" as the protest deadline, that document predates the current rule and is quietly wrong for every entry you're liquidating today.

What stays protected

This isn't a call to rebuild your customs compliance function or bring protest-filing in-house. Keep the broker relationship, the classification work, and the entry-filing process exactly as they run now. What changes is one tracking habit: someone on your side — not just the broker — logs the liquidation date on every entry that carries a disputed duty, classification, or valuation position, the day CBP posts it, not the day a bill surfaces. That's a calendar entry, not a new department.

The first move

Pull your CBP entry summary data or ABI liquidation reports for the last 90 days and identify every entry that liquidated with a duty rate, classification, or value different from what you expected at entry. For each one, find the actual bulletin-notice liquidation date — not the invoice date, not the broker-notification date — and count 180 days forward from it. Any entry already past that count has a final, unappealable duty assessment. Any entry inside the window still has a live protest right, but it's running whether or not it's on anyone's calendar yet.

The move this week

Add one line to your broker-communication SOP: request liquidation-date notice, in writing, within five business days of each posting — not folded into a monthly summary. Then put the 180-day deadline on whoever owns trade compliance internally, with the bulletin-notice date as day zero, confirmed against the broker's number rather than assumed from it. One date, one owner, one deadline tracked at the moment it starts — not discovered after a duty bill forces the question.