Pension NI and Tax Basics
5 min read Article Updated 2026-05-19
Landing your first graduate job is a monumental achievement. You have aced the interviews, secured the offer, and you are ready to start your career. Then, at the end of your first month, you open your payslip and notice something shocking. The number hitting your bank account is significantly lower than your annual salary divided by twelve.
Your payslip now has a stack of deductions you have never dealt with before. While university prepares you for your chosen field, it rarely prepares you for the intricacies of HM Revenue & Customs (HMRC), tax codes, and pension contributions.
Don’t panic. This guide breaks down exactly where your money goes, why it is necessary, and how to ensure you are not paying too much.
1. Income tax: the big one
Income tax is the primary tax you pay on your earnings. However, you do not pay tax on every single penny you earn. Everyone in the UK has a Personal Allowance. This is the amount of income you can earn each year without paying any tax at all.
For the vast majority of graduates, the standard Personal Allowance is currently £12,570 (always check the official Gov.uk rates as these can change in the budget).
How Tax Bands Work
The UK uses a “progressive” tax system. This means you only pay the higher rates on the portion of your salary that falls into that specific band, not on your whole salary. This is a common misconception.
| Band | Taxable Income | Tax Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Basic Rate | £12,571 to £50,270 | 20% |
| Higher Rate | £50,271 to £125,140 | 40% |
| Additional Rate | Over £125,140 | 45% |
Note: Rates may differ slightly if you live in Scotland.
Understanding Your Tax Code
You will see a code on your payslip, such as 1257L. This tells your employer how much tax-free income you are entitled to.
- 1257 represents your Personal Allowance (£12,570) divided by 10.
- L is the standard letter for someone born after 1948 with no special circumstances.
If you see a weird code like “BR” or “0T” on your first payslip, you might be on an emergency tax code. This often happens if HMRC doesn’t have your details yet. Don’t worry, this usually resolves itself, and you will be refunded any overpayment automatically in a future paycheck.
2. National insurance (NI)
National Insurance is separate from Income Tax. It builds up your entitlement to certain state benefits, most notably the State Pension and the NHS.
Unlike Income Tax, NI is calculated on a pay-period basis (weekly or monthly) rather than annually. This means if you have a massive bonus one month, you might pay more NI that month, which isn’t refundable later even if your annual earning is lower.
You generally start paying National Insurance once you earn above a certain threshold (roughly £12,570 a year). The main rate for employees is currently 8% on earnings between the primary threshold and the upper earnings limit, and 2% on earnings above that.
3. Student loan repayments
Many graduates view this as a debt, but it behaves much more like a graduate tax. You only repay it if you are earning enough money.
The repayment threshold depends on when you started your course and which plan you are on:
- Plan 2 (started before August 2023): You repay 9% of everything you earn above the threshold (£29,385 for 2026/27).
- Plan 5 (started Aug 2023 onwards): The threshold is lower (approx. £25,000) and the repayment term is longer (40 years).
This is deducted automatically from your payslip before the money hits your account. This does not affect your credit score, though mortgage lenders will take the monthly expenditure into account when calculating affordability.
4. The workplace pension: free money?
When you start a job, you will likely be “auto-enrolled” into a workplace pension scheme. It might be tempting to opt out so you can have more cash in your pocket today. However, we strongly advise you to think twice before doing so.
Why you should stay enrolled:
1. Employer Contributions: By law, if you contribute to a pension, your employer must contribute too (usually a minimum of 3%). Many graduate schemes offer even better matching. For example, if you put in 5%, they might put in 5% or even 10%. If you opt out, you are essentially turning down a pay rise.
2. Tax Relief: The money goes into your pension before tax is deducted (or you get tax relief added later). This means it costs you less from your net pay to save a larger amount in your pension pot.
3. Compound Interest: Saving in your early 20s is powerful. A pound saved at 22 is worth significantly more at retirement than a pound saved at 42, thanks to decades of compound growth.
5. Summary: the net pay calculation
To summarize, if you are earning a salary of £30,000, you don’t take home £2,500 a month. A simplified breakdown of what the monthly deduction hierarchy looks like:
- Gross Pay: Your total monthly salary.
- Pension: Deducted (often before tax).
- Taxable Pay: What is left.
- Income Tax: 20% on the amount above the monthly allowance.
- National Insurance: Calculated on your earnings.
- Student Loan: 9% of earnings over the threshold.
- Net Pay: The sweet number that actually lands in your bank account.
Understanding these deductions helps you budget correctly. It ensures that when you negotiate a salary for your second job, you know exactly what that increase looks like in real terms.
Useful Resources
For the most accurate and up-to-date calculators, always refer to independent government sources:
Frequently asked questions
How much income tax will I pay on a graduate salary?
You pay 0 percent on the first 12,570 pounds (personal allowance), 20 percent up to 50,270 and 40 percent above. So on a 28,000 salary you pay around 3,086 pounds in income tax per year. The tax code 1257L applied to your payslip handles this automatically.
Should I opt out of my workplace pension?
Almost never. Auto-enrolment means your employer adds 3 percent on top of your 5 percent, plus 20 percent tax relief. Opting out throws away free money. The minimum 5 percent contribution costs you around 50 pounds of net pay per month on a 28,000 salary.
What is the National Insurance rate for new graduates?
Class 1 NI is 8 percent on earnings between 12,570 and 50,270 pounds and 2 percent above. On a 28,000 salary this is roughly 1,234 pounds per year. NI funds your state pension, NHS and benefits and shows on your payslip as NI.
Do I need to file a tax return in my first year of work?
Usually no. PAYE handles tax on your salary automatically. You only need to self-assess if you have side hustle income above 1,000 pounds, rental income, dividends above the allowance or you earn over 100,000 pounds. Register with HMRC by 5 October if any apply.
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