TaxTide
SED & residency day counter
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Built for mariners: SED tracked to the day, safe-days forecasts, and a planner that shows the tax cost of a trip before you book it.
A missed SED claim costs £10,000+. An accountant costs £500. TaxTide costs less than an hour of either.
TaxTide counts the days your income depends on. Built for seafarers, offshore workers and expats, it calculates your day-count position, forecasts how long you can safely stay, and stores the evidence an enquiry would ask for — entirely on your device.
WHAT IT CALCULATES
• UK Seafarers' Earnings Deduction (SED): the eligible period, the half rule and the 183-day visit limit, tracked to the day from HMRC's HS205
• 183-day residency counters with UK, Ireland and Australia presets
• US Substantial Presence Test with the exact weighted formula
• US FEIE Physical Presence Test — including the trap most mariners miss: days over international waters don't count
WHY MARINERS TRUST IT
• Safe-days forecast: "34 safe UK days remaining" — before you book the flight home
• Safe-days alerts: a heads-up 14, 7 and 1 day before any rule goes at risk
• What-if planner: sketch a trip and see every rule's before/after without touching your records
• Every number comes with its full step-by-step calculation — the audit trail HMRC would want to see
• Evidence vault for boarding passes, discharge stamps and visa pages, exported as a PDF report your accountant can file
• Offline-first and private: no account, no cloud, no tracking. Your data never leaves your device.
FREE VS PRO
The 183-day counter is free forever. TaxTide Pro adds the SED and US engines, forecasts, alerts, the planner, multi-year history, unlimited evidence and the PDF report — $29.99/year after a 7-day free trial, or $79.99 once, yours forever.
TaxTide calculates day counts for information only. It is not tax, legal or financial advice — confirm your position with a qualified adviser before filing.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Abdulrahman Alotaibi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Abdulrahman Alotaibi
- Size
- 1.3 MB
- Category
- Finance
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- TaxTide Pro — Lifetime $79.99
- TaxTide Pro — Yearly $29.99
- Copyright
- © 2026 Abdulrahman Alotaibi