How UK Income Tax Actually Works: Bands, Allowances, Traps and Scottish Rates in 2026

The UK Income Tax Bands for 2026-27

UK income tax is a progressive tax - the rate increases as income rises, and each rate applies only to the income within that band, not to total income. This point is consistently misunderstood: moving into the higher-rate band does not mean all income is taxed at 40%, only the income above the higher-rate threshold.

For England, Wales, and Northern Ireland residents, the 2026-27 bands are as follows. The Personal Allowance of £12,570 applies to income below this level, which faces no income tax. The basic rate of 20% applies to income from £12,571 to £50,270, representing a tax-free income of £12,570 and a taxed band of £37,700. The higher rate of 40% applies to income from £50,271 to £125,140, a band of £74,870. The additional rate of 45% applies to income above £125,140.

The maximum income tax payable at the basic rate on income within the basic-rate band is £7,540 (20% of £37,700). A taxpayer earning exactly £50,270 pays £7,540 in income tax. A taxpayer earning £100,000 pays £7,540 at basic rate plus £19,892 at higher rate on the £49,730 above the basic-rate threshold, for a total income tax liability of £27,432 before adjustments.

The 60% Effective Tax Rate: The Trap Most People Miss

The most significant and least discussed feature of the UK income tax system is the effective 60% marginal tax rate that applies to income between £100,000 and £125,140. This rate does not appear in any tax table because it is not a statutory rate - it arises from the interaction of the Personal Allowance withdrawal mechanism and the 40% higher rate.

Section 35 of the Income Tax Act 2007 provides for the withdrawal of the Personal Allowance at the rate of £1 for every £2 of "adjusted net income" above £100,000. As the allowance is withdrawn, each additional £2 of income generates an additional £1 of taxable income that was previously tax-free. This additional taxable income is taxed at 40%, creating an effective rate of 40% on the direct income plus 20% on the previously tax-free income (40% of the £1 of restored taxable income), totalling 60%.

On concrete terms: for every £1 earned between £100,000 and £125,140, the taxpayer retains 40 pence and remits 60 pence in income tax. The band is £25,140 wide - the full Personal Allowance of £12,570 is withdrawn at £2 for each £1, requiring £25,140 of income above £100,000 to fully exhaust the allowance. An individual earning £125,140 or above has no Personal Allowance remaining.

The mitigation is straightforward: pension contributions, Gift Aid donations, and certain other reliefs reduce "adjusted net income" for the purpose of this calculation. An individual earning £115,000 who makes a £15,000 pension contribution reduces adjusted net income to £100,000, restoring the full Personal Allowance and avoiding 60% effective tax on £15,000 of income. The tax saving is £9,000 (60% of £15,000), with a net cost of the contribution after relief of £6,000. This is the most powerful tax-saving mechanism routinely available to UK higher earners.

National Insurance: The Tax That Is Not Called a Tax

National Insurance Contributions (NICs) are legally distinct from income tax but function as a parallel employment earnings tax. For 2026-27, employed earners pay Class 1 employee NICs at 8% on earnings between the Primary Threshold (£12,570 per year) and the Upper Earnings Limit (£50,270 per year), and at 2% above the Upper Earnings Limit.

The combined effective rate of income tax and NICs on employment earnings for a basic-rate taxpayer earning between £12,570 and £50,270 is 28%: 20% income tax plus 8% NICs. For earnings between £50,271 and £100,000, the combined rate is 42%: 40% income tax plus 2% NICs. This 42% combined rate is the effective marginal rate most higher earners face on each additional pound of employment income in this band.

Employer NICs are an additional 13.8% charge on employment income above the Secondary Threshold (£9,100 in 2026-27), borne by the employer rather than the employee. The total employment cost of a £50,000 salary is therefore approximately £56,900 when employer NICs are included. This distinction matters for salary sacrifice arrangements, which reduce the employer NIC liability and can be used to structure additional pension contributions in a tax-efficient manner.

Scottish Income Tax: Divergence and Its Consequences

Scottish taxpayers pay income tax rates set by the Scottish Government under Section 80C of the Scotland Act 1998, rather than the UK government rates. The Scottish rates have diverged significantly from the rest of the UK, particularly for higher earners.

For 2026-27, Scottish rates apply as follows. The starter rate of 19% applies from £12,571 to £14,921. The basic rate of 20% applies from £14,922 to £26,561. The intermediate rate of 21% applies from £26,562 to £43,662. The higher rate of 42% applies from £43,663 to £75,000. The advanced rate of 45% applies from £75,001 to £125,140. The top rate of 48% applies above £125,140.

The practical consequence of these rates is that Scottish taxpayers earning above approximately £28,000 pay more income tax than equivalent English taxpayers, with the gap widening significantly at higher incomes. A Scottish taxpayer earning £100,000 pays approximately £3,500 more in income tax per year than an English taxpayer at the same income. This differential is relevant to employer recruitment decisions, relocation considerations, and the value of pension contributions (which reduce adjusted net income for the Personal Allowance withdrawal calculation in Scotland as in England).

Dividend Tax and the Dividend Allowance

Dividend income is taxed separately from employment and self-employment income. The Dividend Allowance for 2026-27 is £500 per year - dividends within this allowance face no income tax. Above the allowance, dividend tax rates are 8.75% for basic-rate taxpayers, 33.75% for higher-rate taxpayers, and 39.35% for additional-rate taxpayers.

The Dividend Allowance was reduced from £2,000 to £1,000 in April 2023 and further to £500 in April 2024. The cumulative reduction from the 2017 level of £5,000 represents a significant tax increase for dividend-receiving investors, particularly owner-managers of limited companies who structure remuneration through dividends. HMRC estimates that this reduction increased the number of individuals required to complete a self-assessment tax return by approximately 650,000.

Frequently Asked Questions

What is the income tax Personal Allowance for 2026-27?

The Personal Allowance is £12,570 for 2026-27. Income below this threshold faces no income tax. The allowance is frozen at this level until April 2028 under current government policy. Higher earners with adjusted net income above £100,000 have their allowance reduced by £1 for every £2 above £100,000, disappearing entirely at £125,140.

What is the 60% tax trap?

Income between £100,000 and £125,140 is effectively taxed at 60% because the Personal Allowance is withdrawn at £1 for every £2 of income above £100,000. The withdrawn allowance becomes taxable at 40%, creating a combined 60% effective rate. Pension contributions that reduce adjusted net income to £100,000 restore the full allowance and avoid this band entirely.

Do Scottish taxpayers pay more income tax?

Yes, above approximately £28,000. The Scottish Government sets its own income tax rates which are higher than UK rates for income above the basic-rate band. A Scottish taxpayer earning £100,000 pays approximately £3,500 more per year than an English taxpayer at the same income. The Scottish rates apply to non-savings, non-dividend income only.

How does salary sacrifice reduce income tax?

Salary sacrifice arrangements reduce gross salary in exchange for employer-provided benefits - most commonly pension contributions. Reducing gross salary reduces income subject to both income tax and National Insurance, providing tax relief at the combined marginal rate. For a basic-rate employed taxpayer, salary sacrifice pension contributions save 28% combined income tax and NICs. For a higher-rate taxpayer, the saving is 42% on income in the higher-rate band.