United Kingdom salary calculator 2026

A British payslip has two deductions that behave in completely different ways, and most of the confusion about UK take-home pay comes from treating them as one. Income tax is annual, progressive and built around the personal allowance. National Insurance is a separate charge with its own rules, collected on the same pay but funding different things. The tax year starts in April, and Scotland sets its own bands, which is why quick estimates of UK net pay are so often wrong.

The personal allowance and the three bands

The first 12,570 pounds a year is tax free. That is the personal allowance, and it is the single most important number on the payslip because it removes tax entirely from a large share of a low salary. Above it, income tax runs in three bands: 20% up to 50,270 pounds, 40% up to 125,140 pounds, and 45% on anything higher. Under PAYE the employer spreads the allowance evenly over the year, so a monthly payslip already reflects a twelfth of it. In real life the allowance is withdrawn gradually for very high earners, which our model does not do; that only matters well above the salaries in the table below.

National Insurance

The second deduction is employee Class 1 National Insurance, which the model charges at 8% of gross pay. It pays for the state pension and contributory benefits, and it is the contribution record, not the tax paid, that decides whether someone qualifies for a full state pension. National Insurance does not reduce the income tax base: the 8% and the income tax are both calculated on the same gross figure. Real NI has a starting threshold below which nothing is charged and a lower rate on earnings above an upper limit; the model ignores both and applies the flat 8% to every pound, so it overstates NI slightly for a low earner and understates it slightly for a very high one.

Three salaries side by side

At the minimum wage the personal allowance shelters roughly half the salary, and income tax and National Insurance end up as deductions of similar size, which surprises people who think of NI as a rounding error. At the average wage income tax has pulled clearly ahead. At 8,000 pounds a month the 40% band is doing real work and income tax is more than three times the NI. The effective rate climbs from about 18% to about 35% across the three rows, and the reason is entirely the band structure, not National Insurance, which stays a flat share of pay.

Employer National Insurance

Employers pay their own Class 1 National Insurance, at 15% in the model, on top of gross salary. On the 3,253 pound average wage that is roughly 488 pounds a month, taking the total cost of employment to about 3,741 pounds. This is the figure a hiring manager budgets for and the one a day-rate contractor competes against, and it is invisible on the employee's payslip. The real charge starts above a secondary threshold and small employers can offset part of it with the Employment Allowance, so the actual bill is a little lower than a flat 15% suggests.

VAT

The standard VAT rate is 20%, with a 5% reduced rate on a narrow list such as domestic energy and children's car seats, and a zero rate on most food, books and children's clothing. Adding VAT to a 100 pound net price gives 120 pounds. The UK VAT calculator works in both directions.

Working hours and bank holidays

The model uses a 40 hour week over five 8 hour days, with the 48 hour weekly ceiling from the Working Time Regulations. The UK is unusual in Europe in letting individual employees sign an opt-out from that ceiling. The 2026 calendar in the model holds New Year's Day, Good Friday on 3 April, Easter Monday on 6 April, Christmas Day and Boxing Day. Boxing Day falls on a Saturday in 2026, so 4 holidays land on a weekday and the year has 257 working days. The model does not include the early May, spring and summer bank holidays, nor the substitute days or the separate Scottish and Northern Irish calendars, so the working days calculator will count a few more working days than an English employer would.

How close the estimate is

The UK figures are marked as an estimate, and the honest summary is that the band rates and the allowance are the real statutory ones, so the income tax line should match HMRC's tables for an employee on a standard tax code. The simplification is on the National Insurance side: it is charged from the first pound instead of above a threshold, so that line comes out a little higher than a real payslip, most noticeably at the minimum wage. Scottish taxpayers, people repaying a student loan through payroll, and anyone in an auto-enrolment pension will see further differences. For comparing an offer in London with one in Dublin, or for understanding why the allowance matters so much, the tax-free allowances guide and the calculator together are a sound starting point.