Common Myths About Hourly Pay and Overtime

When you're comparing job offers or negotiating a raise, it's easy to fall for myths about how hourly rates translate into annual salary and what overtime really pays. Understanding the facts can save you from disappointment and help you use tools like MSE take home pay to get a realistic estimate of your net income.

Myth 1: 'My hourly rate times 40 hours times 52 weeks gives my annual salary'

Many people assume a 40-hour week is standard, but in the UK full-time roles often use 37.5 hours per week, especially in the public sector and many office jobs. The standard conversion used by employers and HMRC is:

Annual gross salary = hourly rate × contracted hours per week × 52 weeks

For example, the National Living Wage for workers aged 21 and over rises to £12.71 per hour from April 2026. At 37.5 hours per week, that gives:

£12.71 × 37.5 × 52 = £24,784.50 gross per year

If you mistakenly use 40 hours, you'd get £26,436.80 – a difference of over £1,650. Always check your contract for your exact weekly hours. Also, unpaid overtime is common in sectors like retail and hospitality, so your actual hourly earnings may be lower than your headline rate.

Myth 2: 'Overtime is always time-and-a-half'

There is no legal right to a premium rate for overtime unless your contract specifies it. Many employers pay plain time for the first few extra hours, then time-and-a-half after that. Some pay double time on bank holidays or Sundays. The key is to read your contract or staff handbook.

Overtime can also push you into a higher tax bracket, but only the marginal rate applies – you won't lose money overall. To see the net effect, use a take-home pay calculator like the one on MSE. The MSE take home pay tool lets you input overtime hours and see exactly how much extra you keep after tax and National Insurance.

Myth 3: 'London weighting is a fixed extra amount'

London weighting varies enormously by employer and sector. The NHS, for example, uses Higher Cost Area Supplements (HCAS). For 2026/27, inner London attracts 20% of basic salary (capped at £8,746), while outer London gets a lower percentage. Other employers may offer a flat allowance of £3,000–£5,000, or nothing at all.

The ONS data shows median full-time annual pay in London was significantly above the UK median of £39,039, but that reflects a mix of higher salaries and London weighting. When comparing jobs, always ask for the total compensation including any location allowance, and run the figures through a calculator that accounts for it.

Using Official Data to Benchmark Your Pay

The Office for National Statistics (ONS) Annual Survey of Hours and Earnings (ASHE) provides the most reliable benchmarks. In April 2025:

• Median full-time weekly earnings: £766.60
• Median full-time annual gross pay: £39,039
• Median hourly earnings (excluding overtime): £19.67

These figures are for employees who have been in their job for at least a year. If you're earning below these medians, you might be underpaid – but remember that regional and sector differences matter.

For minimum wage workers, the GOV.UK rates from April 2026 are:

• Age 21+: £12.71 per hour
• Age 18–20: £10.85 per hour
• Age 16–17 and apprentices: £8.00 per hour

The voluntary Real Living Wage (calculated by the Living Wage Foundation) is higher: £13.45 per hour UK-wide and £14.80 in London for 2025-26.

How to Convert Hourly to Salary Correctly

Always use your contracted hours. If you work 37.5 hours per week:

Annual gross = hourly rate × 37.5 × 52

To get monthly gross, divide by 12. For take-home pay, you need to subtract income tax, National Insurance, and any pension or student loan deductions. The MSE take home pay calculator does this automatically using current tax codes.

Remember that your actual take-home may differ if you have salary sacrifice arrangements (e.g., cycle-to-work, pension) or if you're on a different tax code. Always check your payslip.

Overtime and Take-Home Pay: A Worked Example

Suppose you earn £15 per hour and work 37.5 hours per week. Your annual gross is £29,250. If you do 5 hours of overtime per week at plain time, your gross rises to £33,150. But after tax and NI, the extra £3,900 might only add around £2,500 to your net – depending on your tax band. Use the MSE take home pay tool to model different overtime scenarios.

Final Thoughts

Don't rely on rough rules of thumb. Use official sources like ONS and GOV.UK for benchmarks, and a reliable calculator for your personal situation. The MSE take home pay calculator is a great starting point, but always verify with your own payroll.

For more guidance, explore our Hourly to Salary, salary articles, and hourly calculator pages.