What post-clearance actually means.
A post-clearance audit (PCA) is HMRC's (HM Revenue & Customs) review of your import or export declarations after the goods have been released. HMRC can audit declarations for up to three years after clearance — verifying classification, valuation, origin, and the duty paid.
Customs clearance isn't final — it's provisional. When HMRC releases your goods, they're not saying "this declaration is correct." They're saying "we'll check this later." For the next three years, two things can happen:
You can reclaim
If you overpaid duty — wrong classification, missed preferential rates, unclaimed reliefs — you can claim it back within the same three-year window.
This is what "post-clearance" means. Most UK importers don't realise they're sitting on both risk and opportunity.
HMRC audits are accelerating.
The risk is real. HMRC's compliance yield reached £41.8 billion in FY 2023-24 — up from £34 billion the year before. Customs audits are a priority.
HMRC uses risk profiling and data analysis to select audit targets, alongside intelligence from other agencies. They're not checking randomly — they're targeting:
When HMRC audits, they demand evidence. If you can't produce it — or if it shows underpayments — you face backdated duty through a C18 post-clearance demand, plus interest, with penalties of £1,000 to £2,500 per contravention on top. Self-disclosure before HMRC finds the errors typically results in lower penalties. For a deeper look at how targets are picked, see what triggers an HMRC customs audit.
Don't wait for HMRC to audit you.
Where you're leaving money on the table.
But here's the flip side: overpayments don't reclaim themselves. And once that three-year window closes, the money is gone.
Most UK importers are sitting on recoverable duty. The most common sources:
Reclaims go to HMRC through the C285 overpayment process — the customs duty reclaim guide walks through it end to end, and returned goods have their own relief covered in the Returned Goods Relief guide.
The three-year lookback window closes permanently.
Money not reclaimed is lost forever. Every month that passes, your oldest entries expire from scope. BorderAudit has helped recover £4.7M in duty to date — most of it from overpayments importers didn't know existed.
One fashion retailer recovered £144,000 in duty on re-imported customer returns where Returned Goods Relief had gone unclaimed — found by auditing the declaration history while those entries were still inside the three-year window.
How BorderAudit fills the gap.
Manual spot-checks sample a handful of entries and miss the rest. BorderAudit is an automated post-clearance customs audit platform: it scans every declaration in your history with an automated rule engine — catching errors before HMRC does and surfacing every recovery opportunity.
It is freemium software with flat pricing — free to start, Premium at £149/month, with a Partner tier for advisors — never a success-fee service. If an audit letter is your immediate worry, the audit readiness product covers the preparation side.
Post-clearance audit, answered.
The three-year clock is running.
Connect your customs data once and every declaration is checked automatically — errors caught before HMRC finds them, overpayments reclaimed while the window is still open. Free to start. Flat pricing. No success fees.