Answers · UK 2025/26

How are self-employed fishermen taxed, and can they claim the Seafarers' Earnings Deduction?

Self-employed fishermen pay Income Tax and Class 4 National Insurance on their fishing profits like other sole traders, but many working share fishermen pay a special reduced Class 2 National Insurance rate rather than the standard rate. The Seafarers' Earnings Deduction, which can exempt qualifying earnings from Income Tax entirely, is generally only available to employed seafarers on qualifying voyages, not typical UK inshore self-employed fishermen.

Last updated: 4 July 2026Last reviewed: 4 July 2026How we verify

Full answer

Self-employed share fishermen — those paid a share of the catch's value rather than a fixed wage — are taxed under standard Self Assessment rules on their fishing profits: Income Tax at 0% up to the £12,570 Personal Allowance, 20% basic rate to £50,270, 40% above that, and 45% over £125,140. A long-standing quirk of the system is that share fishermen historically pay a specific, slightly higher rate of voluntary Class 2 National Insurance (reflecting entitlement to contribution-based Jobseeker's Allowance that other self-employed people cannot claim), alongside Class 4 NIC at 6% on profits between £12,570 and £50,270 and 2% above. Allowable expenses typically include boat running costs, fuel, gear and equipment, safety equipment, mooring fees, and a proportion of capital allowances on the vessel itself if owned by the fisherman. The Seafarers' Earnings Deduction (SED), which can make 100% of qualifying earnings free of UK Income Tax, is aimed at employed seafarers who work on ships making international voyages and spend limited days in the UK during a qualifying period — it generally does not apply to self-employed inshore or coastal fishermen operating UK-based fishing vessels, since SED requires employment on a ship, not self-employment as a share fisherman. Fishermen should also consider VAT registration if turnover exceeds £90,000, and many operate through a partnership or family fishing business structure that affects how profits and NI are split. Use the Self-Employed Tax calculator to estimate your own liability.