TaxTide

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/