# Seafarers Tax Calculator — Track Sea Days for SED Claims > Track sea days for Seafarers Earnings Deduction (SED) claims accurately. (iPhone/iPad app by william cardno.) - Source: https://appshunter.io/ios/app/seafarers-tax-calculator/id6758364410 (this page in markdown: same URL + `.md`) - Developer: [william cardno](https://appshunter.io/developer/1872562149) - Category: Finance - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 15.1 · 31 MB - Languages: American English - Released: 2026-03-10 - Data updated: 2026-08-25 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/seafarers-tax-calculator/id6758364410/reviews.md ## What is Seafarers Tax Calculator? Seafarers Tax Calculator – Know Your SED Position Know exactly where you stand with your Seafarers Earnings Deduction (SED) — before it’s too late. Track your voyages, calculate your qualifying days, and see your Days in Hand (DIH) and fail date in real time. Built offshore, for offshore workers. Why this matters Most seafarers don’t realise they’re short on days until the end of the tax year. By then… it’s too late. This app shows you: How many qualifying days you have How close you are to failing The exact date your claim could fall short No spreadsheets. No guesswork. Key Features SED Tracking Made Simple Log voyages and holidays in seconds Automatic qualifying day calculation Works fully offline (perfect offshore) Days in Hand (DIH) See how much buffer you have Know instantly if you’re close to the edge Fail Date Prediction See the exact date your claim could fail Stay ahead instead of reacting too late HMRC-Ready Records Keep a clear log of your trips Export CSV and PDF reports for accountants or HMRC Smart Reminders Get alerts before your fail date Stay in control of your claim all year round Document Storage Store discharge books, payslips, and records Keep everything in one place when it matters Built for Offshore Reality Works without signal or WiFi No login required No complicated setup Designed for real offshore rotations Who it’s for Offshore workers Seafarers claiming SED Wind, oil & gas, marine crews Anyone needing to track qualifying days accurately Simple but powerful This isn’t about features. It’s about one thing: Knowing your position before you submit your claim. Premium Features Upgrade to unlock: Days in Hand (DIH) Fail Date tracking Export reports Smart alerts Extra document storage Final word If this app helps you avoid losing your SED claim… it’s already paid for itself. Disclaimer The app is designed as a practical tracking tool and does not replace professional tax advice. Terms of Use (EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/⁠ ## Key features - Track voyages and holidays - Automatic qualifying day calculation - Offline functionality - Days in Hand (DIH) tracking - Fail date prediction - HMRC-ready record export (CSV/PDF) - Smart reminders - Document storage ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Premium Monthly | $2.99 | per month | | Premium Yearly | $24.99 | per year | ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/seafarers-tax-calculator/id6758364410/reviews.md ### 2/5 — Expensive for all the features *2026-06-04* Expensive app for what it does can save you money but better apps out there that do more. ### 5/5 — A must have! *2026-03-13* Brilliant app, a must have for UK seafarers, exports easily to PDF or CSV. Accurate and unlike other apps, tells you your predicted fail date so you can plan ahead. Full support from the creator also. **Developer response:** Thanks for the great feedback, Archie — really glad the app is helping. More improvements planned for future updates 👍 ## Frequently asked questions about Seafarers Tax Calculator ### What is Seafarers Tax Calculator used for? Seafarers Tax Calculator helps you track your sea days and calculate your Seafarers Earnings Deduction (SED) position. It aims to prevent seafarers from realizing they are short on qualifying days too late in the tax year. ### How does Seafarers Tax Calculator calculate qualifying days? The app automatically calculates your qualifying days based on the voyages and holidays you log. This eliminates manual calculations and guesswork, providing real-time insights into your SED claim status. ### Can I use Seafarers Tax Calculator offline? Yes, Seafarers Tax Calculator is designed to work fully offline, making it perfect for offshore environments where internet connectivity may be unreliable. You can log voyages and check your status without needing a signal. ### What are the premium features of Seafarers Tax Calculator? Premium features include tracking Days in Hand (DIH), Fail Date prediction, exporting reports, smart alerts, and extra document storage. These features offer more advanced insights and proactive management of your SED claim. ### Does Seafarers Tax Calculator have ads? No, Seafarers Tax Calculator does not contain advertisements. The app is free to download and use, with optional premium features available through in-app purchases. ### What devices does Seafarers Tax Calculator support? Seafarers Tax Calculator is available for iPhone, iPad, and iPod. It is designed to be compatible with Apple's mobile operating systems. ### How often is Seafarers Tax Calculator updated? The app was last updated on June 16, 2026, with version 1.0.127. This indicates regular maintenance and potential feature additions by the developer. ### Is Seafarers Tax Calculator suitable for children? Seafarers Tax Calculator has an age rating of 4+. While the app's functionality is for adults managing tax claims, the rating suggests no inappropriate content for younger users. ## Version history (last 5 releases) ### 1.0.129 — 2026-07-28 Fixed an issue that could prevent documents from opening on some iPhones improved document handling and overall stability General bug fixes and performance improvements ### 1.0.127 — 2026-06-16 This update improves backup guidance and data protection messaging throughout the app. What's new: improved backup and restore guidance, Added backup reminders before exporting data, Enhanced data protection messaging for users changing devices, General stability improvements ### 1.0.126 — 2026-04-28 Improved subscription reliability — premium access now updates automatically after app updates. Summary screen now refreshes correctly when returning to the app. Improved fail date tracking to ensure alerts stay accurate. Added a quick explanation for Y/N to make results clearer. ### 1.0.125 — 2026-04-27 Improved subscription reliability — premium access now updates automatically after app updates. Summary screen now refreshes correctly when returning to the app. Improved fail date tracking to ensure alerts stay accurate. Added a quick explanation for Y/N to make results clearer. ### 1.0.124 — 2026-04-22 Fixed an issue where some users could lose Premium access after renewal. Improved subscriptions syncing and restore reliability Added stability improvements for Premium status across app sessions --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*