Seafarers Tax Calculator (SED)

The Seafarer’s Tax Calculator is the easiest and fastest way to calculate your SED (Seafarer’s Earnings Deduction). We’ve come up with the most efficient and hassle-free tax calculator.
The website and App draws upon HMRC’s rules to determine and explain if you’re entitled to a tax return and how much. If you need a clear and uncomplicated guide to Seafarers Earnings Deduction, then look no further!

Instructions
Use the form below to give a total number of days out of the UK per trip, either enter the date in the box or click back through the calender. Use the calculator for each trip outside UK waters then use the spreadsheet below if you have a large number of trips to add up. The spreadsheet automatically adds up each column. If it works out to more than 183 days working outside UK waters in a qualifying year, then you can apply for Seafarers Earnings Deductions.