Research reviewed on 12 November 2026 against the linked official guidance. Illustrations are hypothetical, not client outcomes or professional advice.
What exactly was paid?
Start by separating customs duty on the declaration from import VAT, excise, freight and administrative charges. An importer with a plausible tariff classification issue needs to show the duty amount paid and why a different legal treatment should have applied on the date of import. An invoice total alone cannot establish that.
| Scenario | Likely route | First question |
|---|---|---|
| Customs duty overpaid on a CDS declaration by an importer with a linked EORI | CDS repayment service | Which MRNs, dates, line items and legal grounds? |
| Person without a registered EORI or an HMRC-specified special case | Online C285 | Does HMRC direct this claimant to C285? |
| VAT-registered importer who overpaid import VAT | Adjustment through VAT return | How was import VAT originally accounted for? |
| Rejected imports or withdrawn declaration | Separate rules and time limits | Which event and legal basis applies? |
| Goods imported into Northern Ireland classified as “at risk” | Special Northern Ireland arrangements | Do the separate NI rules apply? |
These are initial screens, not a universal filing instruction. Read the HMRC repayment guidance before choosing any process. Claimants may need a UK bank account for repayment.
Three clocks: 3 years, 1 year and 90 days
HMRC normally provides three years for overpayments, one year for rejected imports and 90 days for withdrawing an import declaration, subject to exceptions. A downloaded dataset covering four years of imports does not extend the legal claim window. Keep each entry's date and applicable rule in your register.
What a £1,500 variance does — and doesn't — prove
Fictional calculation
Fifteen entries have a combined customs value of £75,000. A proposed alternative treatment would lower the duty rate by two percentage points, creating a mathematical difference of £1,500. But a lower rate is not enough: classification, the law in force then, evidence of origin, additional measures, previous decisions and deadline must all be checked. The recoverable amount could be £0.
Minimum evidence before a claim is more than a hypothesis
- Importer identity: confirm EORI, importer of record and any authorised representative.
- Declaration: MRN, import date, original commodity code, declared origin and tax lines.
- Commercial proof: product specifications, invoices, packing list and relevant shipping or origin documents.
- Law and calculation: demonstrate the rule that applied at the entry date and reconcile duty actually paid.
- Authority and history: identify prior claims, decisions, other potential underpayments and an appropriate reviewer.
Eliminate these tempting false positives
- A tariff rate is lower today but was not applicable at import.
- A supplier states a country of manufacture without satisfying the specific preferential-origin rule.
- Import VAT is added to a customs-duty reclaim without checking the VAT-return correction route.
- Brokerage fees, courier charges or freight are mistaken for customs duty.
For deeper evidence, use the CDS audit workbook and review our tariff classification, origin and returned goods guides.
Primary sources
A specific, documented issue?
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