The UK uses a progressive tax system — you only pay the higher rate on income above each threshold, not on your whole salary.
Personal allowance: Everyone gets £12,570 of income completely tax-free. This is reduced by £1 for every £2 of income above £100,000, disappearing entirely at £125,140.
Basic rate (20%): Applies to income from £12,571 to £50,270. This is the tax band most workers fall into.
Higher rate (40%): Applies to income from £50,271 to £125,140. At this level, pension contributions become very tax-efficient.
National Insurance (2025/26): Employees pay 8% NI on earnings between £12,570 and £50,270, and 2% above that. Note: NI and income tax are calculated separately on different bases.
