Seafarers Tax Auto Log

Seafarer Tax Deduction helps UK seafarers track time spent outside the UK to qualify for the Seafarers' Earnings Deduction (SED) under HMRC HS205.
Working out whether you meet the "50% rule" across a long qualifying period is fiddly and easy to get wrong. This app does the counting for you — logging your voyages, tracking your days in and out of the UK, and showing at a glance whether you're still qualifying.
KEY FEATURES
• Live qualifying tracker — see your days outside the UK, UK days used, and whether you're on track, updated automatically.
• "Must depart by" date — the app tells you the latest date you can stay in the UK before breaching the 50% threshold, with reminders at 14, 7, and 3 days before.
• Automatic voyage tracking — optional GPS logging records your position once per day and flags border crossings. Every record stays a draft until you review and approve it.
• Multiple qualifying periods — track separate periods side by side and switch between them instantly.
• Attach documents — keep discharge books, contracts, and payslips attached to each voyage as photos or PDFs.
• Import & export — bring in voyages from a spreadsheet, and export your full log as CSV or XLS to send straight to your accountant.
• HS205 working sheet — generate a PDF summary aligned to the HMRC HS205 format.
Your data stays on your device. No account required.
IMPORTANT
This app is a tracking and guidance tool only. It does not provide tax advice and does not guarantee eligibility for the Seafarers' Earnings Deduction. Always consult a qualified tax professional or HMRC before submitting a claim.