Tax code, NI, gross, net… if your first payslip looked like a different language, you weren’t imagining it.
I remember opening my first one and not having a clue what any of the numbers meant. Nobody sits you down and explains it. You’re just handed a slip of paper, or these days an email, covered in codes and percentages, and you’re expected to know what it all means.
It’s one of those money basics that never really gets taught at school, along with how much you should actually be saving from a starting wage, and the fact that free, impartial help exists if you’re stuck.
So let’s fix all three, starting with the payslip itself.
What your payslip is actually telling you
By law, every employee and worker in the UK has a right to a payslip, and it has to show what you’ve earned before and after deductions, what’s been taken off (like tax and National Insurance), and how many hours you worked if that affects your pay. It doesn’t have to be paper. Plenty of employers now send payslips by email or through an online portal instead.
Once you know what each bit means, it stops being intimidating and starts being genuinely useful information about your own money.
Gross pay and net pay
Gross pay is your full wage before anything is taken off. Net pay is what actually lands in your bank account after tax, National Insurance, and any other deductions.
When someone tells you they “earn £24k”, they usually mean their gross salary, not what they take home each month. It’s a really common mix-up, especially if you’re comparing your payslip to a job advert.
Your tax code
Your tax code tells your employer how much of your income is tax-free before they start deducting Income Tax. For most people with one job and no unusual circumstances, the code for the 2026/27 tax year is 1257L. The “1257” refers to the £12,570 Personal Allowance, the amount you can earn each year before you pay any Income Tax at all. The “L” simply means you’re entitled to the standard allowance.
If your code looks different, for example, it starts with BR, or ends in W1, M1 or X, it’s worth understanding why rather than ignoring it. Sometimes there’s a completely normal explanation, like having a second job. But if something looks off, HMRC is who you contact to get it corrected, not your employer, and it’s worth checking.
Research cited by National Numeracy suggests around two in five UK adults are on the wrong tax code, which is thought to add up to roughly £8.2 billion overpaid in tax every year. Catching a wrong code early can save you a genuinely large amount of money over time.
National Insurance
National Insurance (NI) is a separate deduction from Income Tax. It counts towards things like your State Pension and certain benefits later in life.
Under the current National Insurance rates for the 2026/27 tax year, you pay nothing on the first £12,570 you earn, 8% on the portion between £12,570 and £50,270, and 2% on anything above that. NI is worked out pay period by pay period rather than building up across the year the way Income Tax does, which is why the two deductions can sometimes look slightly out of step with each other.
Pension contributions
If you’re 22 or over and earning above a certain threshold, your employer has to automatically enrol you into a workplace pension.
You’ll usually see a small deduction for this on your payslip, and your employer adds money on top of it. It’s easy to skim past on a first payslip, but it’s essentially extra money going toward your future for very little effort on your part, so it’s worth understanding rather than opting out of without thinking it through.
Student loan repayments
If you took out a student loan, repayments only start once you earn above a set threshold, and they’ll show as their own line on your payslip once they kick in. If you don’t see a deduction yet, that usually just means you’re not earning enough yet for repayments to start, not that something’s wrong.
How much should you actually be saving from a starting wage?
This is the bit school really doesn’t cover. Most of us are taught, without ever being told outright, to save “whatever’s left” at the end of the month. If you’ve ever tried that, you’ll know the honest answer is usually nothing. There’s rarely anything left once life happens.
A more useful approach is deciding how much to save before you spend the rest, rather than after.
One common guideline is the 50/30/20 rule: roughly 50% of your take-home pay on essentials like rent, bills (I’ve got my guide to saving money on your bills if that chunk feels too big) and getting to work, 30% on the things you enjoy, and 20% into savings. Treat it as a rough shape to aim for, not a strict rulebook.
On a starting wage, especially if you’re paying full rent for the first time, your “essentials” might easily take up more than half, and that’s completely normal. It doesn’t mean you’re bad with money.
To put some real numbers on it, here’s roughly what a starting wage looks like after Income Tax and National Insurance, based on someone working full-time hours (around 37.5 hours a week) on the 2026/27 minimum wage rates:
| Age band | Approx. hourly rate (2026/27) | Approx. gross yearly wage | Approx. take-home per month |
|---|---|---|---|
| 18 to 20 | £10.85 | £21,150 | £1,560 |
| 21 and over | £12.71 | £24,785 | £1,780 |
These figures are illustrative only. They assume a standard tax code, no student loan repayments and no pension deduction, so your actual take-home pay will be a little lower once a workplace pension is included, and everyone’s hours and circumstances differ. Use the gov.uk for your own exact numbers.
Even so, it shows the shape of the problem: if you tried to save 20% of that, you’re looking at somewhere around £155 to £180 a month. That might feel completely unrealistic in your first job, and for a lot of people it will be, especially once rent and travel are covered.
What matters far more than hitting a percentage is building the habit early. Even £20 or £30 a month, moved automatically the day you’re paid, adds up over a year and starts to feel like a safety net rather than an afterthought.
If your take-home pay barely stretches to cover your essentials right now, that’s not a personal failing. It’s worth checking that you’re being paid correctly in the first place, and finding out what support might be available to you, rather than assuming saving simply isn’t possible.
The free help most people don’t know exists
I didn’t find out about Citizens Advice until my early 20s, and I really wish I’d known about it from my very first job. Citizens Advice is a UK charity offering free, confidential and impartial help with money, including reading your payslip, working out a budget on a small wage, and understanding what you’re entitled to.
It’s genuinely free, there’s no catch, and using it has no impact on your credit score. You can contact their AdviceLine, use their online webchat, or find your local branch through citizensadvice.org.uk.
MoneyHelper’s free budget planner is also worth using alongside it if you want a clearer picture of exactly where your money goes each month, using your actual payslips and bank statements.
If money still feels like a foreign language, it’s not because you’re bad with it. It’s because nobody taught you the basics, and that’s exactly the gap services like Citizens Advice exist to fill.
A few things worth checking on every payslip
- Your tax code, especially in a new job or if your circumstances have recently changed
- That your hours and rate of pay match what you actually worked
- Any deduction you don’t recognise
- Whether your pension contribution has started, if you’re eligible for auto-enrolment
Keep your payslips somewhere safe, digitally or on paper. You’ll need them later for things like mortgage applications, tenancy references and sorting out tax queries.
Quick answers on how to read your first payslip
What does my tax code mean?
It tells your employer how much of your pay is tax-free. 1257L is the standard 2026/27 code and means you get the full £12,570 Personal Allowance.
How much National Insurance will I pay?
Nothing on the first £12,570 you earn in a year, 8% on the portion between £12,570 and £50,270, and 2% above that, for the 2026/27 tax year.
Is Citizens Advice actually free?
Yes. It’s a charity, and its advice is free, confidential and impartial, with no impact on your credit score.
How much of my wage should I be saving?
There’s no single right answer, but a common starting guideline is around 20% once essentials and spending money are covered. On a starting wage, even a small, consistent amount is more useful than chasing a percentage you can’t sustain.
My take
Nobody hands you a manual for adulting, and your payslip is usually the first proof of that. Once you know what gross, net, tax code and NI actually mean, it stops being confusing and starts being information you can actually use. Once the basics feel less overwhelming, come and have a look at more ways to save money on the blog.
If you’re just starting, or you know someone who is, this is worth passing on, and pointing them toward Citizens Advice if things still feel unclear. Free, impartial help genuinely exists. It’s just a shame nobody tells you about it sooner.
