CBP extended liquidation on my entry: why, and what it changes for each clock and refund

What does an extension or suspension do to each clock?

Liquidation is CBP's final computation of the duty on an entry. Until it happens, nearly everything about the money on that entry is provisional, so moving the liquidation date moves almost every other date with it. This table sets out each clock on an entry under the normal one-year rule, after an extension, and during a suspension.

Two things in that table catch importers out. First, the protest clock does not run while an entry is extended, so there is nothing to protest and no deadline to miss until liquidation is posted. Second, an extension costs or earns money every day: interest keeps accruing on whatever the liquidation will change.

Why did CBP extend this entry?

The statute gives three reasons CBP can act on and one the importer can. Under 19 U.S.C. 1504(b), CBP may extend when the information needed for the proper appraisement or classification of the goods, for the correct drawback amount, or for ensuring compliance with applicable law is not available to it, or when the importer asks and shows good cause. 19 CFR 159.12(a) restates the appraisement-or-classification ground and the importer's request; the statute's wording is wider than the regulation's.

So a CBP-initiated extension means, in plain terms, that someone at CBP has an open question about the entry. The posted notice gives the reason (159.12(b)). Common triggers worth checking first:

1. A request for information (CBP Form 28) or a notice of action (CBP Form 29) on the entry or its siblings. An unanswered CF-28 is the usual reason an entry is held open. Answering a CF-28 or CF-29 covers how to check your own lines before you reply.
2. A classification or value question on a product line, often affecting every entry of the same part number, so look for the same extension on other entries.
3. A pending ruling or a related protest on the same goods that CBP wants to apply.
4. Your own request. Some extensions were asked for by the broker on your behalf to keep a correction open; check before treating it as a CBP inquiry.

A suspension is a different instrument. It is required by statute or court order (159.12(a)(2)), most often because the goods fall under an antidumping or countervailing duty order whose final rate Commerce has not set, and its notice is posted the same way (159.12(c)). CBP does not choose to suspend; it has to.

Worked entry: what an extension changes on a $12,000 refund

An importer files a consumption entry on November 3, 2025 and deposits estimated duties on November 14, 2025. In the summer of 2026 it finds that one line was overpaid by $12,000 and files a post-summary correction for the refund on July 20, 2026, inside the 300-day window, which closes on August 30, 2026. The importer is a corporation, so the overpayment rate applies.

Case A, normal cycle. The entry liquidates on September 11, 2026, day 312.

Case B, extended. CBP extends liquidation by one year, to November 3, 2027 at the latest, while it looks at another line, and liquidates on December 18, 2026, day 410.

The rates are CBP's quarterly figures from its September 22, 2026 notice (91 FR 60141): 6 percent on corporate overpayments from January 1, 2025 to March 31, 2026, 5 percent from April 1 to June 30, 2026, and 6 percent from July 1 to December 31, 2026, with daily compounding under 26 U.S.C. 6622. Underpayment rates in the same periods are 7, 6 and 7 percent.

The interest is worked in three periods: November 14, 2025 to April 1, 2026 is 138 days at 6 percent, April 1 to July 1, 2026 is 91 days at 5 percent, and July 1, 2026 to liquidation is 72 days (Case A) or 170 days (Case B) at 6 percent, each day compounding at the annual rate divided by 365. CBP's own figure on the liquidation will be the one that counts; this is a check of its order of magnitude.

So the extension delayed the refund by about three months and added about $204 of interest to it. On an underpayment the same extension would have added about $241 to the bill. Neither changes the principal: the duty owed is what the correct classification, value and rate say, whenever liquidation happens.

What should you do with an extended entry?

1. Read the posted notice and its reason. The cbp.gov posting is the official notice; the ABI message is a courtesy copy (159.12(b)).
2. Find the question. Check for CF-28s, CF-29s, ruling requests and protests on the same goods. If CBP asked for information, answer it fully and on time; an extension that runs on because nobody answered helps no one.
3. Re-audit the extended entry's lines yourself. CBP is looking at something on it. Better that you find the overpayments and the underpayments first, and correct both, than learn about them from a notice of action.
4. Use the open window. While the entry is unliquidated, a correction is still a post-summary correction, not a protest. Check whether ACE will accept a PSC on the entry: the July 6, 2026 notice extends the PSC window for extensions the importer requested and was granted, and for suspensions with an allowable basis.
5. Track the new dates. Each extension adds up to a year; the four-year outer limit is fixed from the entry date. Keep the extension expiry date and count in your entry list. How to check entry liquidation status shows how to pull those fields for a whole export.
6. Book the interest both ways. Finance should accrue interest on known overpayments and underpayments on extended entries, because it is accruing in law whether or not anyone has booked it.

TariffSense reads each entry's lines and liquidation status from broker entry exports, flags the overpaid and underpaid lines on extended and suspended entries while the correction window is still open, and estimates the interest each finding carries to the scheduled liquidation date. For checking one rate on one line, the duty calculator shows the stack for a given date.

When should you ask for an extension yourself?

When you have found a problem late and need time to prove it. Under 19 CFR 159.12(a)(1)(ii), you can ask in writing before the statutory period expires, and you must show good cause: more time is needed to present information that will affect the pending action, or a similar question is under review by CBP. A typical case is a valuation adjustment that needs the supplier's year-end transfer-pricing figures, or a classification argument waiting on a ruling. A granted extension then keeps the PSC route open up to 15 days before the new scheduled date, under the July 6, 2026 notice.

The trade-off is the interest: an extension on an entry that also carries an underpayment lengthens the period the underpayment interest runs. Weigh the two before asking.

What happens at the end of the line?

Every extended entry ends in one of two ways. CBP liquidates it, and the posting starts the 180-day protest period under 19 CFR 174.12(e). Or it reaches four years from the entry date unliquidated, and 19 CFR 159.12(f) deems it liquidated at the rate, value, quantity and duty the importer asserted, unless a suspension still holds it. For a deemed liquidation, 19 CFR 159.9(c)(2) dates the liquidation as of the expiry of the statutory period, even if the posting appears later, and the 180 days run from that date. Any refund or payment owed on a deemed liquidation is due within 90 days of it under 19 U.S.C. 1504(a)(3), not the 30 days of an ordinary liquidation. If you filed a refund-direction PSC and the entry deems liquidated, check whether ACE carried your corrected figures as the asserted amounts; if not, protest within the 180 days.

For the protest itself see how to file a customs protest; for every clock on an entry at once, how long to fix a past entry.

This page describes the statute and regulations; it is not legal advice. Confirm any filing with your licensed customs broker, and talk to counsel before a protest or a prior disclosure.