Money management
How to budget for a loan repayment
The income allocation method, building a payment buffer, aligning your repayment date with payday, and what to do when budgets tighten.
5 min read → Your income
Understanding
Your Payslip
Gross, net, tax code, National Insurance, pension — what every line on a UK payslip actually means, and how to spot when something is wrong before it costs you.
6 min read • Cash Train editorial team
Why the payslip matters
Most people glance at the bottom figure and file the payslip away. But your payslip is the single clearest record of what you earn, what is taken off, and what you actually keep — and it is the number every sensible budget is built on.
Understanding it also helps you catch costly errors early, and shows lenders you know your real, take-home affordability.
Gross pay vs net pay
Gross pay
Your total earnings before anything is deducted — the salary figure people usually quote. It is not the money you can spend.
Net pay (take-home)
What lands in your account after tax, National Insurance and other deductions. This is the figure to budget with and to base any loan repayment on.
Whenever you work out what you can afford, use net pay. Basing a budget on gross pay is the most common reason people over-commit.
The deductions, line by line
Between gross and net sit the deductions. On a typical UK payslip you will see:
Income tax (PAYE)
Collected automatically through Pay As You Earn, based on your tax code and how much you earn above your personal allowance.
National Insurance
Contributions on earnings above a threshold that build entitlement to the State Pension and certain benefits.
Pension
If you are auto-enrolled, your workplace pension contribution comes out before or after tax depending on the scheme. Your employer usually adds to it.
Student loan
If you are repaying a student loan, deductions start once your income passes the plan threshold and appear as a separate line.
Other deductions
Things like season-ticket loans, cycle-to-work schemes, or charitable giving via payroll may also appear.
Reading a worked example
Here is how gross becomes net on a simple, illustrative monthly payslip:
Worked example (illustrative)
Gross monthly pay
£2,200
Income tax
− £201
National Insurance
− £110
Pension (5%)
− £110
Net take-home pay
≈ £1,779
Illustrative figures only, based on a standard 1257L tax code. Your actual deductions depend on your tax code, pension scheme and circumstances.
Notice the gap: a £2,200 salary is really about £1,779 of spendable money. That £1,779 is what a responsible lender looks at.
Spotting a payslip mistake
Payroll errors happen. A quick monthly check protects you:
Compare to last month
A sudden change in take-home pay with no pay rise or role change is the clearest signal something is off.
Check your tax code
Confirm the code matches your situation. A wrong code can mean months of over- or under-payment. If unsure, contact HMRC.
Question unknown deductions
If a line appears that you do not recognise, ask payroll before assuming it is correct.
Keep your payslips
Store them — digitally is fine. You will need them for mortgage and loan applications, and as proof if a dispute arises.
For free, impartial help on tax and pay, MoneyHelper is a good starting point.
Related guides
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Common questions
FAQ
Gross pay is your total earnings before anything is taken off — the headline salary figure. Net pay, sometimes called "take-home pay", is what actually lands in your bank account after income tax, National Insurance, pension contributions and any other deductions. When you budget or work out what you can afford to repay, always use your NET pay, because that is the money you genuinely have.
Your tax code tells your employer how much tax-free income you are entitled to before income tax applies. The most common code for the 2024/25 tax year is 1257L, meaning £12,570 of tax-free personal allowance. A code with different numbers or letters (such as BR, D0 or K) signals a different situation — a second job, no allowance, or an underpayment being recovered. If your code looks wrong, contact HMRC, because an incorrect code means you could be paying too much or too little tax.
National Insurance contributions (NICs) are deducted from earnings above a threshold and build your entitlement to certain state benefits, including the State Pension. They appear as a separate line from income tax on your payslip. Like tax, NICs are calculated automatically by your employer through the PAYE system.
First, compare it to the previous month to spot what changed. Check your tax code, your hours, and any new deductions. If something does not add up — a deduction you do not recognise, or take-home pay that has dropped without explanation — raise it with your payroll or HR department promptly, and keep the payslip. Errors are easier to correct the sooner they are flagged.
Borrow against what you actually take home.
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