Our UK income tax calculator estimates income-tax liability for the 2026/27 tax year and gives a band-by-band breakdown. For England, Wales and Northern Ireland, it applies the £12,570 Personal Allowance, a 20% basic rate on the next £37,700 of taxable income, a 40% higher rate and a 45% additional rate. The Personal Allowance is tapered for adjusted net income above £100,000. Scottish income tax uses its own starter, basic, intermediate, higher, advanced and top rates. Results are estimates only and do not account for every tax-code adjustment or personal circumstance.