Post Clearance Amendment UK 2026 – Correcting a Customs Declaration

What is Post Clearance Amendment (PCA)?

Post Clearance Amendment (PCA) is the formal HMRC procedure that allows changes to be made to data in a customs declaration after the goods have already been released by the customs authority.

In the CDS (Customs Declaration Service) system every import or export clearance is assigned an immutable MRN (Movement Reference Number). Once goods have been released you cannot edit the original declaration — instead you submit a new corrective notification or form C285, which HMRC links to the original MRN.

When should you submit a PCA?

The most common reasons for correcting a customs declaration after clearance:

• Incorrect HS code (tariff classification) — you used an HS code with a higher duty rate instead of a lower one; amendment = repayment of overpaid duty.
• Missing EUR.1 certificate or origin declaration — you forgot to declare tariff preferences; amendment = refund of duty overpaid as a result of missing the 0% rate.
• Incorrect customs value — you declared a higher or lower value than shown on the invoice; amendment = equalisation of duty.
• Incorrect country of origin — this affected the duty rate applied; amendment = possible refund or additional payment.
• Incorrect quantity or weight — the difference affected the duty amount.
• Change in transaction value after clearance — invoice correction, credit note, post-sale discount.

Form C285 — application for duty repayment or remission

Form C285 (Application for repayment or remission of import or export duties) is the official HMRC document for submitting a PCA. It serves two purposes:

1. Duty repayment — when you have paid too much duty (wrong HS code, missed preferences).
2. Duty remission — when duty was correctly assessed but exceptional circumstances justify it not being collected (e.g. goods destroyed before being placed in free circulation).

What data is required on the C285?

• MRN of the original customs declaration,
• importer's EORI number,
• description of the error or reason for the repayment claim,
• original and corrected HS code / value / country of origin,
• calculated amount to be repaid or paid additionally,
• evidence supporting the correction (EUR.1 certificate, corrected invoice, classification opinion).

How to submit a PCA in the CDS system

Option 1: Amendment via CDS (for minor corrections)

In the CDS system it is possible to submit a simplified online amendment for selected declaration fields. The importer or their agent logs in to CDS on their HMRC Online Services account and selects "Amend declaration". This is available only for amendments that do not fundamentally change the substance of the declaration.

Option 2: Form C285 (for repayment claims)

For a claim for repayment of overpaid duty the only route is form C285. It can be submitted:

• electronically via the HMRC Online Services portal (the "Claim a repayment or remission of import or export duties" service),
• in writing — a completed and signed PDF form to the National Clearance Hub (NCH).

Option 3: PCA notification via agent

A customs broker with access to the CDS system can submit a PCA on the importer's behalf using API access or the CDS portal. This is the fastest route, especially where the error lies on the broker's side.

Time limit for PCA — 3 years

HMRC allows 3 years from the date of the original clearance to submit a PCA or C285 application. The time limit runs from the date the declaration was accepted by CDS (the date on the MRN), not from the date the goods were physically released.

HMRC penalties for errors in customs declarations

HMRC operates a Civil Penalty Regime for customs violations. It is important to distinguish between categories:

Calculating overpaid duty — a worked example

If your company has been using an incorrect (inflated) HS code for several years, the potential duty refund can be significant. Example:

• You import 12 times a year, goods worth £50,000 per shipment.
• You have been using an HS code with 6.5% duty instead of the correct 0% (e.g. preferential goods from the EU).
• Annual overpayment: 12 × £50,000 × 6.5% = £39,000.
• Over 3 years = £117,000 potential refund!

HMRC pays duty refunds with interest for the period from the original payment date — making retrospective corrections even more financially attractive. The interest rate is set by HMRC and published in its guidance.

Common errors that lead to PCA

1. Incorrect HS code — the most common error. Particularly sensitive: goods on the boundary of categories (e.g. food vs. supplement, furniture vs. decorative element).
2. Missed tariff preferences — no EUR.1 certificate or invoice declaration when importing from countries with UK trade agreements.
3. Incorrect customs value for related parties — transactions between affiliated companies require verification using the transaction value method.
4. Omitted post-sale costs — commissions, royalties included in the customs value after clearance.
5. Incorrect country of origin — particularly important for goods from China, the USA and other countries subject to UK anti-dumping or retaliatory duties.

Related articles

• CDS (Customs Declaration Service) UK — how the customs declaration system works
• EUR.1 Certificate — when is it needed and how does it reduce duty?