Financial literacy basics: 8 money concepts every UK adult should know

Your gross salary is not what you live on. In England, Wales and Northern Ireland in 2026/27, the first £12,570 is your tax-free Personal Allowance, income up to £50,270 is taxed at 20%, and you pay 8% National Insurance on earnings between £12,570 and £50,270. Pension contributions and student loan repayments may come off too.

Check your tax code too: 1257L is the standard code. A wrong code is one of the most common reasons people overpay tax. Try your own figures in the take-home pay calculator, and see how National Insurance works for more detail. Scotland has different income tax bands.

A budget is just a plan for your take-home pay. List fixed costs (rent or mortgage, council tax, energy, phone, insurance), then flexible spending (food, transport, fun), then savings and debt repayments. If the total is more than you earn, something has to change before you look at anything else. The 50/30/20 split is a common starting point, though high UK housing costs often push needs above 50%. Our 50/30/20 rule guide and the budget planner help you set one up.

AER (annual equivalent rate) is what savings accounts pay, including the effect of interest being added during the year. APR (annual percentage rate) is the yearly cost of borrowing, including interest and compulsory fees. Use AER to compare savings and APR to compare loans and credit cards. A representative APR only has to be offered to 51% of accepted applicants, so the rate you are actually offered can be higher.

Inflation is the rate at which prices rise. If prices rise 3% a year, £1,000 buys only about £744 worth of today's goods after ten years. That is why a savings rate below inflation means your money is shrinking in real terms, even though the balance goes up. Try different rates in the inflation calculator.

Compound interest works the other way: it means you earn interest on your interest. Saving £100 a month for 20 years puts in £24,000. At 4% a year compounded monthly, it would grow to about £36,700. The extra £12,700 comes from time, not effort. The same maths works against you on debt: unpaid credit card interest is added to the balance and then charged interest too. Model it in the compound interest calculator.

Lenders check your credit file with one or more of the three main UK credit reference agencies: Experian, Equifax and TransUnion. Your file shows your credit accounts, whether you pay on time, and whether you are on the electoral roll. Missed payments stay on your file for six years. You have a legal right to see your file for free, and each agency's data can be viewed free through services such as ClearScore, Credit Karma and MoneySavingExpert's Credit Club. Our guide to how credit scores work explains what helps and what hurts.

An emergency fund is easy access cash for surprises, typically three to six months of essential costs, built up gradually. It stops a broken boiler becoming credit card debt. If you are already struggling, know the difference between priority debts (rent or mortgage, council tax, energy, court fines, child maintenance), where non-payment can lead to eviction, disconnection or enforcement, and non-priority debts such as credit cards and personal loans. Free help is available from StepChange, National Debtline and Citizens Advice.

If you are 22 or over, earn more than £10,000 a year and work in the UK, your employer must enrol you in a workplace pension. The legal minimum is 8% of qualifying earnings (between £6,240 and £50,270), with at least 3% from your employer. Opting out usually means giving up your employer's contribution. Pension contributions also get tax relief. The new State Pension is £241.30 a week in 2026/27 if you have 35 qualifying years of National Insurance; check your forecast on gov.uk.

You can save or invest up to £20,000 a year in ISAs and pay no tax on the interest or growth. Outside an ISA, the Personal Savings Allowance lets basic rate taxpayers earn £1,000 of interest tax-free (£500 for higher rate, £0 for additional rate). Cash in UK-authorised banks and building societies is protected by the FSCS up to £120,000 per person per banking licence, so check which brands share a licence before spreading large sums. Our ISA types guide explains the options.

Knowing all this only helps if you act on it. A small daily amount is a good first step: SYM tells you how much to put aside each day and lets you log it in one tap.