Income Tax & Tax-Free Allowances
Reviewed and updated
You don't pay tax on every pound you earn — here's the part that's yours to keep.
Overview
Income tax is charged on the money you earn, but not on all of it. Most systems give you a tax-free amount first — in the UK this is the Personal Allowance — and only income above that is taxed.
Above the allowance, tax is usually charged in bands: the more you earn, the higher the rate on the top slice of your income.
Core Concept
A tax-free allowance means the first chunk of your earnings each year is yours entirely. After that, income is taxed in steps, so only the portion inside a higher band is taxed at the higher rate — not your whole salary.
This matters because people often fear that earning a little more will "push them into a higher bracket" and leave them worse off. Because only the top slice is taxed more, earning more almost always leaves you with more.
Applied Insight
Suppose your tax-free allowance is 12,570 GBP and you earn 20,000 GBP. You pay no tax on the first 12,570, and the basic rate applies only to the remaining 7,430 GBP.
So a pay rise that nudges you slightly into a higher band only taxes the small amount inside that band at the higher rate. Your existing income keeps its lower rates. More earnings still means more take-home.
Practical Walkthrough
The mistake is turning down extra work or a raise because of "the tax bracket myth". Misunderstanding bands can cost you real income and opportunities.
When you get a raise, check which band the extra falls into and accept that only that slice is taxed more. If you want to reduce tax legitimately, pension contributions are usually the simplest lever, as they often come from pre-tax income.
Key Takeaways
A tax-free allowance means part of your income is not taxed at all.
Above the allowance, income is taxed in bands, not all at one rate.
A higher band only taxes the slice of income inside it, so earning more still pays.
Pension contributions are a common, legitimate way to reduce taxable income.
Next Steps
Find your tax-free allowance for this year and work out how much of your own income sits above it and is actually taxed, so the band system stops feeling like a mystery and you can ignore the bracket myth.