US & UK · Calculator
US and UK deadline calendar
Every US and UK filing and payment date that matters to Americans in the UK, year by year, with weekend and holiday shifts applied to IRS dates.
| Date | Deadline | Applies to | Relates to |
|---|---|---|---|
| 15 January 2026 | USEstimated tax payment 4 Final quarterly estimated payment for the previous year. IRS · Form 1040-ES | Those paying estimated tax | Tax year 2025 |
| 31 January 2026 | UKOnline Self Assessment return and balancing payment Online return, balancing payment for the tax year ended the previous 5 April, and first payment on account for the current year. HMRC · SA100 | UK Self Assessment filers | Tax year 2024/25 |
| 5 April 2026 | UKUK tax year ends The UK tax year runs 6 April to 5 April. HMRC | Everyone | Tax year 2025/26 |
| 15 April 2026 | USUS federal return and payment due Standard due date for the individual return and any tax owed. Taxpayers living abroad get an automatic 2-month extension to file, but interest runs from this date. IRS · Form 1040 | All US persons | Tax year 2025 |
| 15 April 2026 | USEstimated tax payment 1 First quarterly estimated payment for the current year. IRS · Form 1040-ES | Those paying estimated tax | Tax year 2026 |
| 15 April 2026 | USFBAR due (automatic extension to 15 October) Report of Foreign Bank and Financial Accounts. The extension to 15 October is automatic; no request is needed. FinCEN · Form 114 | US persons whose non-US accounts exceeded US$10,000 in aggregate | Tax year 2025 |
| 15 June 2026 | USAutomatic 2-month extension for taxpayers abroad US citizens and residents living outside the US on the regular due date file by this date. Attach a statement. Interest still runs from 15 April. IRS · Form 1040 | US persons living abroad | Tax year 2025 |
| 15 June 2026 | USEstimated tax payment 2 Second quarterly estimated payment. IRS · Form 1040-ES | Those paying estimated tax | Tax year 2026 |
| 31 July 2026 | UKSecond payment on account Second instalment towards the tax year that ended on 5 April. HMRC · Self Assessment | Those making payments on account | Tax year 2025/26 |
| 15 September 2026 | USEstimated tax payment 3 Third quarterly estimated payment. IRS · Form 1040-ES | Those paying estimated tax | Tax year 2026 |
| 5 October 2026 | UKRegister for Self Assessment Deadline to tell HMRC you need to file for the tax year that ended on the previous 5 April. HMRC · Self Assessment | New filers | Tax year 2025/26 |
| 15 October 2026 | USExtended return due (Form 4868) Final filing date if you requested the extension by the June date. A further discretionary extension to 15 December can be requested by letter. IRS · Form 1040 | Those who filed Form 4868 | Tax year 2025 |
| 15 October 2026 | USFBAR automatic extension ends Last day to file the FBAR for the previous calendar year under the automatic extension. FinCEN · Form 114 | US persons with reportable foreign accounts | Tax year 2025 |
| 31 October 2026 | UKPaper Self Assessment return Paper returns for the tax year ended the previous 5 April. HMRC · SA100 | Paper filers | Tax year 2025/26 |
Assumptions and limits
- IRS dates falling on a Saturday, Sunday or legal holiday (including DC Emancipation Day) move to the next business day; HMRC dates do not move.
- The 15 June date for taxpayers abroad is an automatic filing extension; interest on unpaid tax runs from 15 April.
- The FBAR extension to 15 October is automatic.
- State deadlines and corporation tax dates are not included.
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This is an estimate for orientation, not advice. We confirm the position on your facts before any filing.
Written by the US UK Expat Tax advisory team. Last reviewed 7 November 2026
Primary sources checked
General information, not personal tax advice. Rules and thresholds change; we confirm the position for your facts before any work.
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