HMRC Tax Calculator 2026

You open your payslip and see a gap between gross and net pay. An HMRC tax calculator reveals exactly which deductions cause that difference and how much you actually keep.

How does an HMRC tax calculator work?

The calculator takes a handful of inputs and applies the official 2026/27 tax rates and thresholds. You provide your gross annual salary, tax code, any pension contributions (as a percentage of salary or via salary sacrifice), and your student loan repayment plan if applicable.

Once you submit this information, the tool computes your annual and monthly take-home pay. It itemises the income tax, employee National Insurance, and student loan deductions, so you see the full breakdown at a glance.

All calculations follow HMRC’s latest rules, including the personal allowance and income bands. The calculator also handles auto-enrolment pension contributions and salary sacrifice arrangements, adjusting the taxable income accordingly.

Income Tax and National Insurance rates for 2026/27

The government froze most thresholds until April 2028. For the 2026/27 tax year, the following rates apply in England, Wales, and Northern Ireland.

Income tax bands

The personal allowance reduces by £1 for every £2 of income above £100,000, disappearing entirely once income reaches £125,140.

Employee National Insurance (Class 1)

Self-employed individuals pay Class 4 NICs at 6% on profits between £12,570 and £50,270, and 2% above that.

Scotland uses different income tax brackets and rates. The calculator above reflects the rates for the rest of the UK.

Understanding your tax code

Your tax code tells HMRC how much tax‑free income you get. The most common code for 2026/27 is 1257L, meaning you receive the standard £12,570 personal allowance. The number represents the allowance divided by 10; the letter indicates the type of adjustment.

Typical suffixes:

• L – standard personal allowance
• M and N – marriage allowance transfer
• K – you have untaxed income or benefits that must be added to your taxable pay
• BR – all your income is taxed at the basic rate, usually for a second job
• 0T – no personal allowance, used when HMRC lacks information

Check your payslip, P60, or Personal Tax Account online to confirm your code is correct. An incorrect code can lead to over‑ or under‑payment of tax.

PAYE or Self-Assessment: what’s the difference?

PAYE (Pay As You Earn) applies to most employees. Your employer calculates and deducts income tax and National Insurance from your wages before you get paid. The correct amount is sent to HMRC each month, and you usually don’t need to file a tax return.

Self‑Assessment is for anyone with income not taxed at source – freelancers, landlords, or those with investment income, for example. You must report your earnings and claim allowances by filing an annual tax return. Even if you are employed, a second income or benefit‑in‑kind may require a Self‑Assessment.

Smart ways to reduce your tax bill

Legitimate strategies can lower the amount you hand over to HMRC without breaking the rules.

• Pension contributions: Money paid into a workplace or private pension scheme attracts tax relief. Under salary sacrifice, you exchange part of your salary for a pension contribution, reducing both income tax and National Insurance.
• Marriage allowance: If one partner earns less than the personal allowance and the other is a basic‑rate taxpayer, you can transfer 10% of the allowance (£1,260) to save up to £252 in tax a year.
• Charitable donations: Gift Aid allows higher‑rate taxpayers to reclaim the difference between the basic rate and their tax band on donations.
• Work expenses: Certain costs, such as professional subscriptions or uniform cleaning, can be claimed as a tax deduction through a P87 form or Self‑Assessment.

This calculator provides estimates based on current rates and thresholds. For personalised tax advice, consult a qualified accountant or contact HMRC directly.