How it's calculated
Income Tax for 2026/27 is worked out on your income for the tax year (6 April 2026 to 5 April 2027) in three steps.HMRC
- Personal Allowance. The first £12,570 is tax-free. If your adjusted net income is over £100,000, the allowance goes down by £1 for every £2 above that, rounded up to a whole pound, until it reaches zero.
- Taxable income is your income minus the allowance.
- Bands. Each slice of taxable income is taxed at its band's rate.
| Band (England, Northern Ireland and Wales) | Taxable income above the allowance | Rate |
|---|---|---|
| Basic rate | up to £37,700 | 20% |
| Higher rate | to £125,140 | 40% |
| Additional rate | above that | 45% |
Scottish taxpayers pay Scottish rates on wages, pensions and profits:GOV.UK
| Band (Scotland) | Taxable income above the allowance | Rate |
|---|---|---|
| Starter | up to £3,967 | 19% |
| Basic | to £16,956 | 20% |
| Intermediate | to £31,092 | 21% |
| Higher | to £62,430 | 42% |
| Advanced | to £125,140 | 45% |
| Top | above that | 48% |
Welsh rates are set by the Welsh Government and are the same as England's in 2026/27.GOV.UK
Relief-at-source pensions. If you pay into a personal pension or a workplace scheme that adds 20% relief, enter the gross amount. It reduces your adjusted net income (which can restore a tapered allowance) and pushes your band limits up by the same amount, giving higher-rate relief that you claim through Self Assessment.GOV.UK
The formula
- Allowance = max(0, £12,570 − ½ × (adjusted net income − £100,000)), rounded up to a pound.
- Tax = Σ over bands of rate × (taxable income in that band).
- Effective rate = tax ÷ income. Top rate = the band your last pound falls in.
Worked example
Income Tax on £50,000 in England is £7,486; in Scotland it is £8,982.
| Line | Year | Month |
|---|---|---|
| Income | £50,000 | £4,167 |
| Personal Allowance (tax-free) | £12,570 | £1,048 |
| Taxable income | £37,430 | £3,119 |
| Basic rate 20% on £37,430 | £7,486 | £624 |
| Income Tax | £7,486 | £624 |
| Income after Income Tax | £42,514 | £3,543 |
At £110,000 the allowance shrinks to £7,570 and tax is £33,432. A £10,000 gross relief-at-source pension contribution restores the full allowance and brings the bill down to £29,432.
| Line | Year | Month |
|---|---|---|
| Income | £110,000 | £9,167 |
| Personal Allowance (tax-free) | £7,570 | £631 |
| Taxable income | £102,430 | £8,536 |
| Basic rate 20% on £37,700 | £7,540 | £628 |
| Higher rate 40% on £64,730 | £25,892 | £2,158 |
| Income Tax | £33,432 | £2,786 |
| Income after Income Tax | £76,568 | £6,381 |
Assumptions and limitations
- Covers wages, pensions and trading profits (non-savings income). Dividends have their own rates: use the dividend tax calculator. Savings interest, the personal savings allowance and the starting rate for savings are not included.
- Uses the standard Personal Allowance. Blind Person's Allowance, Marriage Allowance and Married Couple's Allowance are not applied.
- Shows the liability for the year, not what PAYE takes in any one month. National Insurance is separate: see the take-home pay calculator.