Yes. You can get a UK mortgage while you claim the Seafarers Earnings Deduction (SED). The deduction lowers your tax bill, not your earnings, and lenders who understand seafarers know the difference. The problem is never the relief itself. It is that an automated check can misread a low tax figure as a low income, so the answer is choosing a lender that looks at what you actually earn.
Situations we see regularly
- You claim the Seafarers Earnings Deduction each year.
- Your tax return shows little or no UK tax.
- You are paid under a seafaring contract.
- Months at sea and time spent outside the UK.
What is the Seafarers Earnings Deduction?
The SED is a relief from HM Revenue and Customs (HMRC) that removes UK income tax on qualifying earnings for work carried out outside the UK over an eligible period. It is a legitimate, well-established relief for seafarers. The practical effect is that your taxable income, the figure many checks rely on, can look far lower than the money you actually earn.
Why does the deduction make a mortgage harder?
Most high street affordability checks are automated and lean on your tax position. When SED has reduced your UK tax to little or nothing, a tick-box system can read that as a small income, even though your contracted pay is strong and steady. The earnings are there. The automated process simply cannot interpret them.
Claiming SED and want a straight answer? Tell us how you are paid.
Start the 60-Second CheckHow do the right lenders assess SED income?
Lenders who work with seafarers assess your gross contractual earnings, supported by your contract and bank statements, rather than reading the tax return at face value. These cases are underwritten by hand, by people who have seen the deduction many times before. Mortgage One places this work across multiple lenders in the market and gives professional advice on which one fits your circumstances. If part of your pay also arrives in a foreign currency, how a lender converts it matters too, which we cover on our foreign currency income page.
The Seafarers Earnings Deduction lowers your tax, not your income, and the right lender reads it that way.
Do I have to stop claiming the deduction?
No. You carry on claiming SED exactly as you do now. There is no need to change how you file or to give up the relief to satisfy a lender. The right lender works with your real earnings and your genuine tax position side by side, because both are true at once.
What evidence will a lender want, and does residency matter?
Expect to provide your current contract, recent payslips, bank statements showing the pay arriving, and records that support your SED claim, such as your tax return and a record of days worked outside the UK. Residency also shapes the lender list and the deposit, so UK-resident seafarers often reach standard deposit levels while non-resident cases tend to need more. You must be on UK soil to receive advice, so we confirm your position properly first.
Let us match your contracted income to a lender that reads it correctly.
Check Your OptionsFrequently asked questions
Does claiming the Seafarers Earnings Deduction stop me getting a mortgage?
No. The deduction lowers your UK tax, not your income. Lenders who understand seafarers assess your gross contracted earnings rather than your tax return, so the relief itself is not the obstacle. Lender choice is.
Will I have to give up the deduction to get a mortgage?
No. You keep claiming the Seafarers Earnings Deduction as normal. The right lender simply looks at what you earn under contract instead of the tax figure, so there is no need to change how you file.
Why do some banks misread my income?
An automated check often reads the low or nil tax figure on your return as a low income. The earnings are real and regular, but the tick-box process cannot see that. A lender that assesses seafarers by hand can.
How do I start?
Use the 60-second check and a Mortgage One adviser will review your answers and tell you where you stand. You can also call us on 01202 155992. You must be on UK soil to receive advice.
Find out where you stand
Tell us how you are paid and a Mortgage One adviser will review your answers.
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