A Post-Summary Correction (PSC) is an electronic correction filed in ACE to an already-submitted entry summary, made after the entry summary has been transmitted but before the entry has liquidated. PSCs replaced the older "Post-Entry Amendment (PEA)" process when ACE rolled out the entry summary module.
Timing. PSCs may be filed:
- After the entry summary has been accepted by CBP
- Up to 270 days from the date of entry (the "PSC window")
- Before the entry has liquidated (which is typically at day 314, but can vary)
The 270-day deadline is the practical constraint — even if the entry is not liquidated, PSCs cannot be filed after day 270.
Common uses:
- Correcting a misclassification (wrong HTS code)
- Updating value declarations after final invoices, royalty true-ups, or assists adjustments
- Adding or correcting country of origin or preference program claims
- Adding Chapter 99 tariff lines for Section 301 or Section 232 duties not initially declared
- Correcting MPF, HMF, or other fee calculations
Procedure. Filed through ABI into ACE by the customs broker or self-filing importer. The PSC replaces the prior entry summary in its entirety — it is not a "delta" but a complete refile. Additional duties (or refunds) flow from the difference between the original and PSC versions.
PSC vs. other corrections:
- PSC — administrative correction before liquidation (preferred when available)
- Protest — formal challenge filed within 180 days of liquidation
- Reconciliation — pre-arranged flagging for issues known at entry but not yet final
- Prior disclosure — voluntary disclosure of violations, typically for entries beyond the PSC/protest windows
PSCs are the first-choice tool for correcting open entries before they liquidate. Failing to file a PSC and instead waiting for liquidation to protest is procedurally inefficient and often weakens the importer's position.