Direct answer
National Insurance on a payslip is the employee NI deducted for that pay period. It is separate from PAYE Income Tax, follows UK-wide rules, and can change when pay changes within a week, month or other payroll period.
National Insurance on a payslip explained
Employee National Insurance on a payslip is calculated separately from Income Tax and can vary by pay period, category and earnings.
The short answer
National Insurance on a payslip is the employee NI deducted for that pay period. It is separate from PAYE Income Tax, follows UK-wide rules, and can change when pay changes within a week, month or other payroll period.
A worked example
On £35,000 a year, a standard 2026/27 tax code and no pension or student loan, the figures work out like this. Open a calculator to put your own numbers in.
Gross salary£35,000
Take-home a year£28,720
Take-home a month£2,393
Take-home a week£552
Related checks
Assumptions used here
| Tax/source year | 2026/27 |
|---|---|
| Region | England/Wales/Northern Ireland |
| Tax code basis | 1257L where the page uses PAYE defaults |
| Pension basis | No pension deduction unless this example says otherwise |
| Student loan basis | No student loan unless selected in this example |
What changes this result
| Calculator setting | The answer is more useful when matched to the same tax year, region, tax code, pension and loan settings used in the calculator. |
|---|---|
| Records to compare | Payslips, HMRC records, student-loan notices and pension scheme documents can explain differences. |
Why a payslip can differ
| Tax code | HMRC tax-code changes, K codes, BR/D codes, or emergency markers can change PAYE deductions. |
|---|---|
| Cumulative basis | Week 1, Month 1 or non-cumulative payroll can differ from a smooth annual calculator estimate. |
| Pension method | Relief at source, net pay and salary sacrifice can affect taxable pay and take-home pay differently. |
| Payroll timing | Bonus, overtime, arrears, refunds, cut-off dates and corrections can all move a single payslip. |
Good next questions
| Open the salary calculator with editable assumptions | calculator next step |
|---|---|
| Review calculation sources and methodology | source context |
Source and methodology context
| What is not decided here | PayBreakdown does not decide payroll correctness, lender approval, benefit entitlement or employer compliance, and does not give regulated financial, mortgage, debt, tax, payroll or legal advice. |
|---|
What the NI on payslip estimate assumes
The figures on this page use the values below. Open the calculator if your example salary differs.
Example salary£40,000 annual gross
How to read the NI line
The NI deduction is usually shown in the deductions area next to Income Tax, pension and loan lines. It is not normally included in the PAYE Income Tax figure.
- Employee NI: the worker deduction shown on the payslip.
- NI category: a payroll category that can affect how NI is calculated.
- Pay-period basis: NI is commonly calculated on the pay in the period rather than by smoothing the whole year like a simple annual estimate.
- Scottish taxpayers: Scottish Income Tax bands can differ, but employee NI remains UK-wide.
Why NI can differ from a salary estimate
NI can move when the pay period includes bonus, overtime, unpaid leave, arrears, refunds, salary sacrifice or a category change.
- Compare the pay period and gross pay before comparing the annual estimate.
- Check whether salary sacrifice reduced pay before NI.
- Check whether the payslip includes any one-off pay or correction.
- Ask payroll which NI category was used if the category looks unexpected.
What this answer does not decide
This is educational guidance for understanding how UK pay and tax work. It does not decide payroll correctness, HMRC treatment, lender approval, benefit entitlement or employment rights, and it is not regulated financial advice. Where a figure matters, check it against your payslip, your HMRC account, or the official guidance linked on this page.
Official sources
GOV.UK: National InsuranceGOV.UK: payslipsGOV.UK: PAYE forms P45, P60 and P11DFrequently asked questions
Is National Insurance the same as Income Tax?
No. Employee National Insurance and PAYE Income Tax are separate deductions, even though both usually come off wages through payroll.
Do Scottish taxpayers pay different National Insurance?
No. Scottish taxpayers can have different Income Tax bands, but employee National Insurance is charged under UK-wide rules.
Last updated 2026-08-19. Estimates are for planning and should be checked against official records where the decision matters.