Your UK paycheck is subject to Income Tax, National Insurance Contributions, and potentially Student Loan repayments. Understanding how these deductions are calculated helps you budget effectively and make informed decisions about pension contributions and salary negotiations.
Income Tax in England, Wales, and Northern Ireland uses three bands: the Basic Rate at 20% on income between £12,571 and £50,270, the Higher Rate at 40% between £50,271 and £125,140, and the Additional Rate at 45% above £125,140. Scotland has six bands with rates ranging from 19% to 48%, making Scottish tax calculations more complex.
The Personal Allowance of £12,570 is tax-free, but it tapers away for incomes above £100,000. For every £2 of income above £100,000, you lose £1 of Personal Allowance. This creates an effective 60% marginal tax rate in the £100,000–£125,140 range for Higher Rate taxpayers — one of the highest marginal rates in the UK tax system.
National Insurance was reformed in April 2024, with the employee rate cut from 10% to 8% on earnings between the Primary Threshold (£12,570) and the Upper Earnings Limit (£50,270). Above the UEL, only 2% is charged. Salary sacrifice pension contributions reduce your NI-able earnings, providing additional savings on top of income tax relief.
Student Loan repayments are a significant consideration for many UK workers. Plan 2 and Plan 5 are the most common plans for recent graduates, with 9% repayments above £27,295 and £25,000 respectively. Postgraduate loans charge 6% above £21,000. If you have both a Plan loan and a Postgraduate loan, both deductions apply simultaneously.