Overpayments found during a prior disclosure: offset, refund, or neither?

Why does a disclosure review find overpayments at all?

Because the review that supports a prior disclosure is a line-level audit, and a line-level audit does not choose a direction. The same pass that finds a product family declared under a number at too low a rate also finds lines declared at too high a value, a Chapter 99 duty paid on an entry date when it no longer applied, or merchandise processing fees on freight that was not dutiable. The importer then holds two lists: what it owes and what it overpaid.

Prior disclosure after you find an underpayment covers the first list: what 19 CFR 162.74 requires, how to scope it and how to compute the tender. This page is about the second list. It asks three questions about each overpaid line: can it reduce the loss you disclose, can it come back as money, and by when.

What is the difference between an offset and a refund?

They are different things with different sources, and confusing them is the expensive mistake.

So an overpayment on a finally liquidated entry is worth something only as an offset. An overpayment on an entry still open is worth its full amount as a refund, if the claim is filed in time.

When does an overpayment offset the disclosed loss?

19 U.S.C. 1509(b)(6)(A) was written for CBP's own audits: when CBP identifies overpayments within the time period and scope of an audit, it treats overpayments on finally liquidated entries as an offset to underpayments also identified on finally liquidated entries, in calculating the loss or penalty under 1592. CBP's regulation extends that to disclosures. 19 CFR 163.11(d)(3) says offsetting applies when a private party submits a prior disclosure in accordance with 162.74 and CBP approves the self-review, including its execution and results, with Regulatory Audit reviewing every such disclosure.

The conditions, all from 163.11(d):

1. Both sides on finally liquidated entries. An entry is finally liquidated once its protest period has run with no protest. The regulation's own definitions draw the same line: 162.71 calls duties lost on entries whose liquidation is final the "actual loss", and the rest "potential loss".
2. Within the time period and scope CBP accepts. For a disclosure, the period and scope you used are subject to CBP approval (163.11(d)(4)). If you sampled, the sampling plan must meet 163.11(c)(3) and (c)(5), and overpayments are projected the same way as underpayments.
3. Not the same acts or entries required. 163.11(d)(5) allows an overpayment on one product to offset an underpayment on another.
4. Not a missed preference or allowance. 163.11(d)(6) excludes overpayments that result from a failure to timely claim or establish a duty allowance or preference. An unclaimed trade-agreement rate or an unclaimed duty allowance does not offset.
5. No improper purpose, no knowing underpayment. Overpayments made to violate any law do not offset, and if any underpayment was made knowingly and intentionally, offsetting is disallowed entirely.

Where offsetting is refused, the Fines, Penalties and Forfeitures office makes that determination and notifies you (163.11(d)(8)).

Which overpaid lines can still come back as money?

Sort them by the status of their entry on the day you find them. The disclosure does not change any of these clocks.

Two notes on the last row. For entries made on or after December 18, 2004, CBP has no authority to reliquidate for a clerical error, mistake of fact or inadvertence without a valid protest (19 CFR 173.4(b)); the old 1520(c) route was repealed. And 163.11(d)(9) says an overpayment is credited toward a refund only where 1520 or the 1514(a) clerical error rules allow it, which on a final entry they generally do not.

Worked example: one review, four kinds of overpayment

Illustrative figures. A review supporting a disclosure, to be mailed on November 20, 2026, finds:

• Underpayments on six finally liquidated entries, from one product family declared at too low a rate: $18,000 of lost duty.
• Overpayment A: $5,000 on three finally liquidated entries, where the declared value included international freight that was not part of the transaction value. Different product, different cause.
• Overpayment B: $2,500 on two finally liquidated entries of Mexican-origin goods that qualified for USMCA, but no claim was made.
• Overpayment C: $1,200 on one entry liquidated on September 4, 2026, from a Chapter 99 duty declared after it had ended.
• Overpayment D: $800 on one entry made on April 9, 2026, still unliquidated, from the same freight error as A.

The importer recovers $2,000 in cash and, if Regulatory Audit approves the self-review, reduces the disclosed loss by $5,000. The interest due under 1592(c)(4) is computed on the loss CBP finally calculates. The $2,500 USMCA overpayment is gone: the one-year 1520(d) window closed before the review found it, which is the case for running the review while those windows are still open.

The timing of the tender matters here. 162.74(c) lets the disclosing party tender with the disclosure or within 30 days after CBP's written calculation. If the full $18,000 is tendered at disclosure and the offset is approved afterwards, nothing in 1509(b)(6) or 163.11(d) turns the difference into a refund (163.11(d)(9)). Discuss with trade counsel whether to tender against CBP's calculation instead.

What should the review hand to counsel?

The offset request is only as good as the self-review behind it, because Regulatory Audit approves the execution and the results, not just the conclusion. For each overpaid line the file needs:

1. The entry number, entry date, line number, liquidation date and whether liquidation is final on the disclosure date.
2. The declared and correct data element (HTS number, value, origin, Chapter 99 heading) and the duty difference on the entry date.
3. The cause, stated so it can be told apart from a missed preference or allowance (163.11(d)(6)).
4. The period and scope of the review, and the sampling plan if one was used (163.11(c)(5)).
5. For lines that are refund material instead, the route and the deadline from the table above.

TariffSense reads broker entry exports and entry summaries, checks every line against the measures in force on its entry date and flags differences in both directions with the entry date, line number and liquidation data attached, so the underpaid and overpaid lists come from one pass over the same rows. The post-entry audit page shows what goes in and what comes back; the duty calculator shows the stack on one date. The disclosure, the offset request, the PSCs and the protests stay filings for the importer, its broker and counsel.

What should you do next on your own entries?

1. Split every overpaid line from the review by entry status on the day you plan to disclose.
2. File the PSCs and protests that have deadlines in the next 60 days first. A post-summary correction for a refund and how to file a customs protest have the mechanics.
3. Mark which finally liquidated overpayments meet 163.11(d) and which are excluded as missed preferences.
4. Take the table, not a summary, to trade counsel to decide the offset request and the timing of the tender.
5. Check any unclaimed trade-agreement lines against the one-year 1520(d) window now; it is the one that closes first.

The post-entry audit pillar has the line checks. Confirm deadlines and filings with a licensed customs broker or trade counsel.