Duty Deferment Interest Calculator
Instantly estimate interest owed on late or deferred customs duty payments. Accurate for importers managing duty deferment accounts and cash flow planning.
Calculate Your Deferment Interest
Enter the outstanding duty amount, the annual interest rate, and the number of days overdue to get an instant interest estimate on a deferred customs payment.
Interest Calculator
Enter your account details to see the estimated interest owed
Total unpaid customs duty, excise duty, or import VAT
Confirm the current published rate before relying on this estimate
Days from the original due date to the payment date
Estimated Interest
Calculated on a simple daily interest basis
Interest Owed by Days Overdue
Estimated interest on a £5,000 outstanding duty balance at a 7.75% annual rate, shown across common overdue periods.
| Days Overdue | Interest Owed | Total Payable | Typical Scenario |
|---|---|---|---|
| 7 days | £7.44 | £5,007.44 | Short administrative delay |
| 14 days | £14.86 | £5,014.86 | Missed direct debit, quick correction |
| 30 days | £31.85 | £5,031.85 | One missed monthly statement |
| 60 days | £63.70 | £5,063.70 | Two consecutive missed payments |
| 90 days | £95.55 | £5,095.55 | Extended payment dispute |
Duty Deferment Interest FAQ
Everything you need to know about how interest is estimated on deferred or late customs duty payments.
A duty deferment account lets importers delay payment of customs duty, excise duty, and import VAT, with a single consolidated payment collected around the 15th of the following month instead of paying at the time each shipment clears customs.
Interest is generally calculated on the outstanding duty amount using a simple daily interest formula: Amount Owed × Annual Interest Rate × Number of Days ÷ 365. Interest usually accrues from the date payment was originally due until the date it is actually paid.
Interest typically starts accruing the day after the scheduled direct debit payment date is missed, and continues to accrue daily until the outstanding balance, including any interest already added, is paid in full.
Yes. The interest rate applied to late or deferred customs payments is reviewed periodically and can change over time, so importers should always confirm the current published rate before relying on any calculation for financial reporting.