Question 1

How does PAYE actually work?

Accepted Answer

PAYE collects income tax and National Insurance every time you are paid rather than in one bill at the end of the year. Your employer looks at your tax code, applies the slice of personal allowance that belongs to that pay period, then works the remaining pay through the bands. Because the system runs cumulatively, each payslip also looks back at everything paid so far in the year. That is why a month with a bonus can be followed by a quieter month where the deduction settles down again. If your pay is steady, the deductions barely move. If it swings, PAYE keeps adjusting until the year end totals line up.

Question 2

What is a tax code and how do I read mine?

Accepted Answer

A tax code tells payroll how much tax free pay to give you. The number is your allowance divided by ten, so 1257L means £12,570 across the year. Letters carry meaning too. L is the standard allowance, M and N show a marriage allowance transfer, K means untaxed income or a benefit outweighs your allowance, and BR or D0 tax the whole amount at a single rate, which usually happens on a second job. Emergency codes ending in W1 or M1 ignore earlier months and treat every payslip as if it were the first, which often overtaxes you until the code is corrected.

Question 3

Why is my take home pay lower than a salary calculator shows?

Accepted Answer

Three things usually explain a gap. The first is a tax code that does not match the standard allowance, often because of a company car, medical cover or an underpayment being collected. The second is a deduction that sits outside tax, such as season ticket loans, union fees, childcare or a workplace savings scheme. The third is timing, where payroll corrects an earlier month inside the current one. Compare the year to date boxes on your payslip against the annual figure from the calculator rather than the single month, and the picture normally makes sense.

Question 4

How do the income tax bands work in England, Wales and Northern Ireland?

Accepted Answer

Pay below the personal allowance carries no income tax. The basic rate of 20 percent then applies up to the higher rate threshold, 40 percent applies above it, and 45 percent applies on the top slice. Only the money inside each band is taxed at that band's rate, so moving into the higher rate never reduces your total pay. The one genuine cliff sits between £100,000 and £125,140, where the personal allowance tapers away and the effective rate on that stretch reaches 60 percent.

Question 5

How are Scottish income tax rates different?

Accepted Answer

Scotland sets its own bands on earned income and uses more of them, with a starter rate below the basic rate and additional bands above it. In practice lower earners in Scotland pay slightly less income tax than the rest of the UK, and higher earners pay noticeably more. National Insurance, dividends and savings interest stay on UK wide rates, so only part of your payslip changes. Your residency, not your employer's address, decides which rates apply, and HMRC flags Scottish taxpayers with a code beginning with S.

Question 6

What counts as taxable pay?

Accepted Answer

Salary, overtime, commission, bonuses, tips paid through payroll, statutory sick pay and statutory parental pay all count. Benefits in kind such as a company car, private medical insurance or an interest free loan above the limit are taxable too, usually collected through an adjusted tax code rather than a separate bill. Genuine business expenses reimbursed at approved rates do not count, and neither do most redundancy payments up to £30,000.

Question 7

When should I fill in a self assessment return?

Accepted Answer

You need one if you are self employed, if you receive rental income, if you have untaxed income above the reporting limits, or if you or your partner claim child benefit while earning above the high income charge threshold. Company directors and people with large investment income often file too. Registration for a first return closes on 5 October after the tax year ends, and the online filing and payment deadline is 31 January.

Question 8

How do bonuses get taxed?

Accepted Answer

A bonus is ordinary pay for tax purposes, so nothing special applies to the rate. What confuses people is the monthly view. Payroll treats the bonus month as though that level of income continued all year, which can push part of it into a higher band and lift the student loan deduction at the same time. Over the full year the totals correct. If the bonus takes you close to a threshold such as £50,270 or £100,000, paying part of it into a pension is the cleanest way to keep it out of the expensive band.

Question 9

What is the difference between gross pay and net pay?

Accepted Answer

Gross pay is the amount agreed in your contract before anything comes off. Net pay is what arrives in your bank account after income tax, National Insurance, pension contributions, student loan repayments and any other deductions. Job adverts quote gross, budgets need net, and the distance between the two grows as salary rises. For a typical UK salary the gap sits somewhere between a quarter and a third of gross pay.

Question 10

How much National Insurance will I pay?

Accepted Answer

Employees pay Class 1 on earnings above the primary threshold at the main rate, then a much lower rate on everything above the upper earnings limit. Self employed people pay Class 4 on annual profits with the same threshold structure and a slightly lower main rate. Unlike income tax, National Insurance is worked out on each pay period rather than cumulatively, so an uneven year can leave you paying more than a smooth one on the same total.

Question 11

Does a pay rise ever leave me worse off?

Accepted Answer

For income tax alone, no, because bands only tax the money inside them. Real world cliffs come from other rules. Crossing £50,000 starts the high income child benefit charge. Crossing £100,000 tapers the personal allowance and can end free childcare hours. Universal credit tapers as earnings rise. A pension contribution that brings adjusted income back under the line often restores the benefit and costs less than the amount you save.

Question 12

How does workplace pension auto enrolment work?

Accepted Answer

Employers must enrol eligible staff aged twenty two or over who earn above the enrolment trigger. The combined minimum is eight percent of qualifying earnings, with at least three percent from the employer. Qualifying earnings ignore the first slice of pay, so the real percentage of your full salary is lower than eight. You can opt out, but you give up the employer money as well as the tax relief, which makes it one of the most expensive decisions available on a payslip.

Question 13

What is salary sacrifice and is it worth it?

Accepted Answer

Salary sacrifice reduces your contractual pay in exchange for a benefit, most often a pension contribution. Because gross pay falls, both income tax and National Insurance fall with it, which makes each pound in the pension cheaper than paying in from net pay. Employers save their own National Insurance too and sometimes share it back. The trade offs are a lower recorded salary for mortgage applications and for statutory pay calculations, so check the timing if you are borrowing or planning parental leave.

Question 14

When do student loan repayments start?

Accepted Answer

Repayments begin from the April after you finish or leave your course, and only once income passes the threshold for your plan. Deductions come off through payroll at nine percent of income above the threshold for undergraduate plans and six percent for postgraduate loans. Interest is added regardless of whether you are repaying. Balances are written off after a set number of years, and that write off date matters more than the balance itself when deciding whether overpaying makes sense.

Question 15

How much holiday am I entitled to?

Accepted Answer

Full time workers in the UK get at least 5.6 weeks of paid leave a year, which is twenty eight days for a five day week. Employers can count the eight bank holidays inside that total. Part time staff get the same 5.6 weeks pro rated to their days, and irregular hours workers usually accrue leave as they work. Holiday pay should reflect normal earnings, so regular overtime and commission belong in the calculation, not just basic pay.

Question 16

What am I owed if I am made redundant?

Accepted Answer

Statutory redundancy pay depends on age, length of service and weekly pay, subject to a weekly cap, and it needs two years of continuous service. On top of that you are owed notice pay, accrued but untaken holiday, and anything your contract promises above the statutory floor. The first £30,000 of genuine redundancy pay is free of tax and National Insurance, while notice and holiday pay are taxed as normal earnings.

Question 17

How is maternity pay calculated?

Accepted Answer

Statutory maternity pay runs for up to thirty nine weeks. The first six weeks pay ninety percent of your average weekly earnings, and the remaining thirty three weeks pay the flat statutory rate or ninety percent of earnings, whichever is lower. Average earnings come from the eight weeks up to the qualifying week, which is why a bonus falling inside that window can raise the whole payment. Many employers offer enhanced schemes, so read your policy alongside the statutory figure.

Question 18

How do I compare two job offers properly?

Accepted Answer

Start with take home pay rather than headline salary, because the tax band the new figure lands in changes the gap. Then add the employer pension rate, since three points of extra employer contribution can be worth more than a modest rise. Subtract commuting and parking, adjust for holiday days, and price the reliability of any bonus. Write both offers as a monthly net figure with fixed costs removed, and the better one is usually obvious.

Question 19

Can I claim tax back if I have overpaid?

Accepted Answer

Yes. Overpayments often come from emergency codes, from leaving a job partway through the year, or from a benefit that stayed in your code after it ended. HMRC reconciles most PAYE records automatically after the tax year and issues a calculation, but you do not have to wait. You can check and correct your code in your personal tax account, and claims can normally go back four tax years.

Question 20

How often do UK tax rates and thresholds change?

Accepted Answer

Rates and thresholds are set at fiscal events, usually a Budget, and take effect at the start of the tax year on 6 April. Some figures have been frozen for several years, which quietly moves more people into higher bands as wages rise. Devolved rates in Scotland follow the Scottish Budget on a separate timetable. Tools on this site follow the current year by default and let you switch to another year when you need to check an older payslip.

UK pay and tax questions, answered plainly