A £40,000 salary does not mean £40,000 in your bank account each year. Several deductions reduce your gross pay before you receive anything. Understanding each line on your payslip helps you budget accurately and spot any errors.
The Main Deductions
1. Income Tax
Income tax is the largest deduction for most workers. Calculated on earnings above the Personal Allowance (£12,570 in 2025/26), it is paid at 20% (Basic Rate), 40% (Higher Rate), or 45% (Additional Rate) depending on your income.
A £40,000 salary attracts roughly £5,486 in income tax — an effective rate of about 13.7%.
2. Employee National Insurance (Class 1)
Employees pay 8% NI on earnings between the Primary Threshold (£12,570) and the Upper Earnings Limit (£50,270), then 2% above that. On a £40,000 salary, this is roughly £2,194 per year.
3. Pension Contributions
If your employer has auto-enrolled you into a workplace pension, the minimum total contribution is 8% of qualifying earnings (employer must contribute at least 3%). Your personal contribution is typically 5% of qualifying earnings and reduces your net pay directly.
Auto-enrolment applies on earnings between £6,240 and £50,270 (the qualifying earnings band in 2025/26).
4. Student Loan Repayments
Deducted by your employer via PAYE on earnings above your plan’s threshold:
- Plan 1: 9% above £24,990
- Plan 2: 9% above £27,295
- Plan 5: 9% above £25,000
5. Other Deductions
Your payslip may also show:
- Salary sacrifice amounts (childcare vouchers, cycle to work, extra pension)
- Benefits in kind adjusted through your tax code
- Attachment of earnings orders (court-ordered deductions)
A Worked Example: £40,000 Salary
| Item | Annual Amount |
|---|---|
| Gross Salary | £40,000 |
| Income Tax | −£5,486 |
| Employee NI (8%) | −£2,194 |
| Pension (5% qualifying) | −£1,688 |
| Take-home pay | ~£30,632 |
That is approximately £2,553 per month — about 76.6% of the gross salary.
How Your Tax Code Works
HMRC issues you a tax code (e.g. 1257L) that tells your employer how much Personal Allowance to apply. Emergency codes (e.g. 1257L W1/M1) or non-standard codes mean you could be overtaxed or undertaxed. Check your code on your P60 or via your HMRC Personal Tax Account.
Employer Costs Are Higher Still
Your employer pays an additional 15% employer National Insurance on your earnings above £5,000. On a £40,000 salary, this adds roughly £5,250 to their cost — meaning the total employment cost is closer to £45,250 for a £40,000 salary.
Key Takeaway
The gap between gross and net pay is substantial, particularly once pension contributions are included. Use our take-home pay calculator to see an accurate breakdown for your exact salary, region, pension rate, and student loan plan.