Liquidation is the process by which U.S. Customs and Border Protection makes its final determination of the correct duty rate, customs value, and applicable fees for an import entry. Until an entry is liquidated, the duties paid at the time of importation are considered estimated. After liquidation, duties are finalized — and CBP either refunds overpayments or bills the importer for underpayments.
Why It Matters for Importers
Many importers assume that once their goods clear customs and duties are paid, the transaction is closed. It is not. CBP has up to 314 days from the date of entry to liquidate, and during this window they can reclassify your product, reassess the customs value, or apply additional duties. If CBP determines that duties were underpaid, you will receive a bill for the difference — plus potential interest and penalties.
Liquidation is also the trigger for legal deadlines. Once an entry is liquidated, you have 180 days to file a protest if you believe CBP's determination was incorrect. Missing this window means the liquidation becomes final and cannot be challenged.
Key Details
- The standard liquidation period is 314 days from the date of entry. CBP can extend this period if the entry is flagged for review or involves pending trade investigations.
- Entries can be suspended from liquidation indefinitely while antidumping or countervailing duty investigations are pending — sometimes for years.
- If CBP does not liquidate within the statutory period (and has not extended it), the entry liquidates "as entered" — meaning the original classification and value stand.
- Your customs broker should monitor liquidation bulletins weekly and flag any entries where CBP's liquidation differs from the original filing.
Rate Advances and Refunds
When CBP liquidates an entry at a higher duty rate than originally filed, the difference is called a "rate advance" and results in a bill to the importer. When liquidation produces a lower rate, the importer receives a refund. Both scenarios underscore the importance of accurate classification and valuation at the time of entry — errors in either direction create financial exposure.
For more on how the customs entry process works from filing to liquidation, visit our customs brokerage services page.