Use the online form service to request an NT tax code if you're claiming to be provisionally entitled to Seafarers' Earnings Deduction (SED).
To request a Seafarers’ NT tax code if you want to claim to be provisionally entitled to Seafarers’ Earnings Deduction (SED) for at least 365 days you can either:
- use the online form service (sign in to, or set up a Government Gateway account)
- fill in the form on-screen, print it off and post it to HM Revenue and Customs (HMRC)
If you use the online form, you’ll get a reference number that you can use to track the progress of your form.
You’re asking HMRC to authorise your employer to make payments to you without deducting Income Tax.
HMRC won’t consider issuing you an NT tax code until after you’ve submitted this form and they’ve processed it.
- your National Insurance number, you can find this on your payslip, P60 or tax return
- your Self Assessment Unique Taxpayer Reference if you have one, you can find this on your tax return, statement of accounts or any other Self Assessment calculations
- employer’s details including name, PAYE reference, address, date you started the employment, and expected annual earnings
details of any planned visits to the UK during this period of work on a vessel, including the:
- visit start and end dates
- vessel name
- vessel type
- official vessel registration number
- date you think your SED should start
Before you start using the postal form
If you’re using an older browser, for example Internet Explorer 8, you’ll need to update it or use a different browser. Find out more about browsers.
You’ll need to fill in the form fully before you can print it. You can’t save a partly completed form so you should gather all your information together before you begin to fill it in.
Related forms and guidance
Seafarers’ Earnings Deduction: tax relief if you work on a ship
If you’re an employee working at sea outside of the UK check if you can claim tax relief on your earnings.
National Insurance if you work on a ship
Find out about National Insurance if you’re a mariner (seafarer) so you can pay in the right country and get a refund if you have overpaid.
Income Tax: EEA resident merchant seafarer repayment claim (R43M(SED))
Use form R43M(SED) to claim a tax refund if you’re a merchant seafarer resident in a European Economic Area State and not ordinarily resident in the UK.