If you’re a basic rate taxpayer in the UK, you pay 20% income tax on the slice of your earnings between £12,571 and £50,270 a year. Anything below £12,570 is covered by the Personal Allowance and taxed at 0%; anything above £50,270 crosses into the higher rate band at 40%. Those thresholds are frozen until at least April 2031, so the band you sit in this year is the band you’ll sit in next year unless your pay changes.1UK Parliament. Direct Taxes: Rates and Allowances for 2026/27
How the 20% Actually Works on Your Pay
The rate applies only to income above your Personal Allowance, not to your whole salary. Take a £30,000 earner. Subtract the £12,570 allowance and you’re left with £17,430 of taxable income. Twenty per cent of that is £3,486 in income tax for the year.
If your pay climbs past £50,270, only the pounds above that line move into the 40% band. The first £37,700 of taxable income keeps being taxed at 20%. That’s what people mean when they say the system is progressive: crossing a threshold doesn’t reprice everything below it.
The Personal Allowance itself is set at £12,570 for 2026–27 under Section 35 of the Income Tax Act 2007.2Legislation.gov.uk. Income Tax Act 2007 – Section 35 Because it hasn’t moved with inflation since 2022, ordinary pay rises have pulled more people into the basic rate band, and pushed some out of it into the higher rate band, without any change to the headline numbers.
National Insurance Comes Off Too
Income tax is only part of the deduction. Employees also pay Class 1 National Insurance at 8% on earnings between £12,570 and £50,270, then 2% on anything above that.3GOV.UK. Rates and Thresholds for Employers 2026 to 2027 On £30,000, that’s roughly £1,394 in NI, sitting alongside the £3,486 of income tax. Combined take from that salary comes to about £4,880 before any reliefs.
Self-employed workers pay Class 4 contributions instead, at 6% on profits between £12,570 and £50,270 for 2026–27. If you’re moving between employment and self-employment, the NI treatment changes even when your income tax band doesn’t.
Savings Interest and Dividends
Two kinds of income sit outside the standard 20% treatment, and both matter for basic rate taxpayers.
Savings interest gets a Personal Savings Allowance of £1,000 tax-free at the basic rate.4GOV.UK. Tax on Savings Interest Higher rate taxpayers get £500, and additional rate taxpayers get nothing. On top of that there’s a 0% starting rate that covers up to £5,000 of savings income, but only if your non-savings income is £17,570 or less for 2026–27. That mostly helps part-time workers and pensioners with small earned incomes.
Dividends have their own £500 tax-free allowance each year. Above it, basic rate taxpayers pay 10.75% on dividends for 2026–27, up from the 8.75% that applied previously.5Legislation.gov.uk. Income Tax Act 2007 – The Dividend Nil Rate, Dividend Ordinary Rate, Dividend Upper Rate and Dividend Additional Rate If you hold shares outside an ISA, that increase changes the maths.
Capital Gains at the Basic Rate
When you sell shares, a second property, or other investments at a profit, capital gains tax applies to the gain above an annual exempt amount of £3,000.6GOV.UK. Capital Gains Tax: What You Pay It On, Rates and Allowances Basic rate taxpayers pay 18% on most gains.7GOV.UK. Capital Gains Tax: What You Pay It On, Rates and Allowances – Rates The gain itself uses up your remaining basic rate band, so if it pushes your total above £50,270, the portion above that threshold is taxed at 24%.
Reliefs Worth Claiming
Pension Contributions
If your workplace pension uses relief at source, the provider automatically reclaims 20% from HMRC and adds it to your pot.8GOV.UK. Tax on Your Private Pension Contributions: Tax Relief Put £80 in and it becomes £100. At the basic rate there’s nothing extra to claim; the top-up happens without you touching a form.
Gift Aid
Tick the Gift Aid box on a charity donation and the charity reclaims the 20% basic rate tax you already paid on that money.9GOV.UK. Chapter 3: Gift Aid A £100 gift becomes £125 for the charity at no extra cost to you. One condition: you need to have paid enough income tax or capital gains tax that year to cover what the charity claims back, or HMRC will ask you to make up the shortfall.
Marriage Allowance
If your spouse or civil partner earns less than the Personal Allowance, they can transfer £1,260 of their unused allowance to you, provided you’re a basic rate taxpayer.10GOV.UK. Marriage Allowance The maximum saving is £252 a year. Claims can be backdated up to four years.11UK Parliament. Income Tax Allowances for Married Couples
Blind Person’s Allowance
If you’re registered as blind or severely sight-impaired, you get an additional tax-free allowance of £3,070 for 2026–27 on top of the standard Personal Allowance. If you can’t use the full amount, the surplus transfers to your spouse or civil partner.
Reading Your Tax Code
Your tax code tells your employer how much tax-free income to give you before deducting anything. The standard 2026–27 code is 1257L, reflecting the £12,570 allowance and no complications.
A BR code taxes every pound from that source at the basic rate; it’s common on a second job when your allowance is already used up on the first. A K prefix means you owe tax on benefits or income exceeding your allowance, so the code effectively adds to your taxable pay rather than subtracting from it. A wrong code leads to either overpaying through the year or a bill later, so it’s worth checking against your circumstances and calling HMRC if something looks off.
If You Live in Scotland
Scottish Income Tax applies to wages and pensions if you live in Scotland; dividends and savings interest still follow UK-wide rates. Scotland has more bands and narrower ones. For 2026–27, the Scottish basic rate is 20%, but it only covers income between £16,538 and £29,526.12gov.scot. Scottish Income Tax: Rates and Bands A 19% starter rate sits below it, and a 21% intermediate rate takes over above it, before the 42% higher rate at £43,663. Scottish earners between roughly £29,500 and £50,270 pay more income tax than someone on the same salary in England, Wales, or Northern Ireland.
When You Might Need to File a Return
Most basic rate taxpayers with only PAYE income never need to file anything; the deductions handle themselves. You do need to register for Self Assessment if you have untaxed income above £2,500, from self-employment, rental property, or investments.
For the 2025–26 tax year, the online filing and payment deadline is 31 January 2027. If you owe less than £3,000 and want HMRC to collect it through your tax code next year instead, file by 30 December 2026. Miss the January deadline and you get an automatic £100 penalty, with interest on unpaid tax accruing at 7.75% per year.13GOV.UK. HMRC Interest Rates for Late and Early Payments
Errors on a return can attract penalties from 30% of the underpaid tax for careless mistakes up to 100% for deliberate concealment.14HM Revenue & Customs. Schedule 24: Penalties for Errors HMRC reduces those figures when you come forward voluntarily, so correcting a mistake yourself before they notice is worth doing.
When Basic Rate Status Ends
One boundary catches people who assume the 20% band simply flows into the 40% band. Once your adjusted net income passes £100,000, you lose £1 of Personal Allowance for every £2 above the threshold.2Legislation.gov.uk. Income Tax Act 2007 – Section 35 By £125,140 the entire allowance is gone. The effective marginal rate between £100,000 and £125,140 works out to roughly 60%, higher than the 45% additional rate that applies above it. Pension contributions are the usual route back below £100,000 for anyone hovering near the line and wanting to keep the allowance intact.