National Insurance Calculator UK 2026/27: Rates, Tables & Worked Examples

National insurance calculator UK searches usually start with the same moment of confusion: you look at your payslip, see a line marked NI, and cannot work out where the number came from. It is not a flat percentage of your pay, it is not the same as income tax, and it does not appear at all on the first £12,570 you earn. That gap between what people expect and what actually gets deducted causes a lot of unnecessary worry, especially when your hours change or you pick up a second job. This guide walks you through exactly how the maths works in the 2026/27 tax year, with worked examples at real salary levels, a monthly deduction table, the separate rules for self-employed workers, and what those contributions actually buy you.

A national insurance calculator UK workers can trust applies two rates for 2026/27: 8% on earnings between £12,570 and £50,270 a year, then 2% on everything above £50,270. Nothing is due on the first £12,570. So someone on £35,000 pays £1,794.40 a year, or roughly £149.53 a month.

How National Insurance Is Calculated in 2026/27

National insurance is a separate deduction from income tax, with its own thresholds and its own rules. Most employees pay Class 1 contributions, which come straight out of gross pay through PAYE before the money reaches your bank account.

The structure is banded, like income tax. You pay nothing on earnings up to the primary threshold, a main rate on the slice between the primary threshold and the upper earnings limit, and a reduced rate on anything above that.

For 2026/27, HMRC has kept the employee rates and thresholds at the same levels as the previous year: 8% on the main band and 2% above the upper earnings limit. That freeze matters more than it sounds. If your pay rose this year but the thresholds did not, a larger share of your earnings falls into the charged bands, so your NI bill grows faster than your pay rise.

The critical difference from income tax is that national insurance uses your earnings in that pay period, not your cumulative earnings for the year. Income tax under PAYE smooths itself out across the year. National insurance does not.

The 2026/27 Rates and Thresholds Table

These are the figures any national insurance calculator UK employees use should be applying for the 2026/27 tax year. It helps to know both the annual and the per pay period versions, because payroll software works in the latter.

The lower earnings limit is the one most people have never heard of, and it is arguably the most useful. If you earn above £129 a week but below £242 a week, you pay no national insurance at all, but you are still treated as having contributed. That protects your State Pension record without costing you anything.

Worked Examples at Common UK Salaries

Here is the calculation done the long way, so you can repeat it with your own number. The method is always the same: subtract £12,570, charge 8% on what is left up to £50,270, then charge 2% on anything above.

Example 1: £25,000 a year

£25,000 minus £12,570 leaves £12,430 in the main band. At 8% that is £994.40 a year, or about £82.87 a month. Your effective NI rate across your whole salary is just under 4%.

Example 2: £35,000 a year

£35,000 minus £12,570 leaves £22,430. At 8% that is £1,794.40 a year, or about £149.53 a month. If you want to see what this looks like alongside income tax and pension, our breakdown of £35k after tax in the UK shows the full take-home picture.

Example 3: £50,000 a year

£50,000 minus £12,570 leaves £37,430, all still inside the main band. At 8% that is £2,994.40 a year, or about £249.53 a month. This is roughly where your effective NI rate peaks, at just under 6%.

Example 4: £70,000 a year

The first slice, £12,570 to £50,270, is £37,700 at 8%, giving £3,016. The second slice, £50,270 to £70,000, is £19,730 at 2%, giving £394.60. Total: £3,410.60 a year, or about £284.22 a month.

Notice what happens between the last two examples. Earnings went up by £20,000 but the NI bill only rose by £416.20. That is the 2% rate at work, and it is why national insurance is often described as regressive at the top end. Your effective rate on £70,000 is about 4.9%, lower than the 6% paid by someone on £50,000.

Monthly and Weekly Deduction Table

If you just want the answer without doing the arithmetic, find the row closest to your salary. These are 2026/27 figures for a standard category A employee with no salary sacrifice in place.

These assume twelve equal monthly payments. Real payslips vary slightly because of rounding and because payroll works to the exact weekly or monthly threshold rather than dividing the annual figure.

Why Your National Insurance Changes Month to Month

This is the single biggest source of confusion, and no simple calculator captures it. National insurance is assessed on each pay period in isolation. Income tax is not.

Say you earn £2,000 a month and then get a £3,000 bonus in December. In that month your gross pay is £5,000. The monthly primary threshold is £1,048 and the monthly upper earnings limit is £4,189, so you pay 8% on £3,141 and 2% on £811. You cannot spread that bonus back across the quieter months to smooth the bill.

The same effect works against people with irregular hours. Two weeks of heavy overtime followed by two quiet weeks produces more national insurance than the same total earnings spread evenly, because the busy weeks push earnings above the weekly upper earnings limit.

There is no annual reconciliation for national insurance the way there is for income tax, so if this happens to you, it is not an error and there is usually nothing to reclaim. Our guide to how to read a UK payslip shows exactly where to find the period figures your employer used.

National Insurance if You Are Self-Employed

Self-employed workers sit under a different set of classes, and the rules changed meaningfully in recent years, so older guides online are frequently wrong.

• Class 4 is the main charge. For 2026/27 it is 6% on profits between £12,570 and £50,270, then 2% on profits above £50,270. It is collected through Self Assessment, not monthly.
• Class 2 is no longer compulsory for most self-employed people. If your profits are above the small profits threshold, which is £7,105 for 2026/27, you are treated as having paid it and you still get a qualifying year.
• Voluntary Class 2 is available at £3.65 a week for 2026/27 if your profits fall below £7,105 and you want to protect your contribution record. It is one of the cheapest ways to buy a qualifying year.

Note the difference in the main rate. An employee pays 8% on the middle band, a sole trader pays 6%. That gap is deliberate, and it partly reflects the fact that self-employed workers do not build entitlement to certain contributory benefits in the same way.

If you are working out a tax bill as well as a contributions bill, our self-employed tax calculator guide for the UK covers both sides together with the payments-on-account trap that catches most people in their second year.

What Your Contributions Actually Buy

National insurance is not just another tax, even if it feels like one. It builds entitlement to contributory benefits, and the State Pension is by far the biggest of them.

You need 35 qualifying years for the full new State Pension, and at least 10 qualifying years to receive anything at all. Between 10 and 34 years you get a proportionate amount. The full new State Pension is around £241 a week for 2026/27.

A qualifying year is any tax year in which one of the following applies:

1. You had earnings above the lower earnings limit of £6,708 as an employee, whether or not you actually paid anything.
2. You had self-employed profits above the small profits threshold, or paid voluntary Class 2.
3. You received a national insurance credit.

That third route is the one people miss. Credits are awarded automatically in a number of situations, including claiming Child Benefit for a child under 12, receiving Carer’s Allowance, claiming Jobseeker’s Allowance or Employment and Support Allowance, being a registered foster carer, or serving on a jury. If you have taken time out of work, you may have more qualifying years than you think.

How to Check Your National Insurance Record

Do this before you rely on any calculator. It takes about five minutes and it is free.

1. Go to GOV.UK and search for “check your National Insurance record”. You will need a Government Gateway account or a verified GOV.UK One Login.
2. Review the year-by-year list. Each year is marked as full, not full, or showing a shortfall you could pay to fill.
3. Cross-check any year marked not full against your own history. Gaps sometimes appear because an employer filed incorrectly, or because you were paid under two payroll numbers.
4. Use the State Pension forecast tool on the same account to see your current projection and how many more years you need.
5. If a year looks wrong, contact HMRC with your payslips or P60 for that year rather than paying a voluntary contribution to fix an error that was not yours.

Filling a genuine gap with voluntary contributions can be excellent value, but only if the extra year actually increases your pension. If you are already on track for 35 years, paying more adds nothing.

What Your Employer Pays on Top

Your payslip only shows your half of the picture. Employers pay secondary Class 1 contributions on your earnings as well, and since April 2025 that rate has been 15% on earnings above a secondary threshold of £5,000 a year.

This matters for two practical reasons. First, it is a real cost of employing you, which is why employers often think in terms of total cost rather than headline salary when they set a budget for a role. Second, it explains why salary sacrifice arrangements are so popular: both you and your employer save national insurance when pay is exchanged for an employer pension contribution.

If you are negotiating an offer, understanding this helps you frame requests. An employer may find a pension uplift easier to agree than the same amount in salary, because the pension route costs them less. Building the numerical confidence to have that conversation is a skill in itself, and Coffee & Study’s finance and accounting courses are a sensible starting point if spreadsheets and payroll maths are not yet your strong suit.

Common Mistakes to Avoid

Assuming NI works like income tax across the year

It does not. Income tax under PAYE is cumulative and self-corrects. National insurance is calculated fresh each pay period with no year-end reconciliation. A one-off bonus, a month of heavy overtime, or an irregular shift pattern permanently costs more national insurance than the same money paid evenly, and there is no refund mechanism for it.

Confusing your NI number with your NI record

Your national insurance number is just an identifier. It says nothing about how many qualifying years you have. Plenty of people assume that because they have had a number since they were 16, their record must be complete. Check the record itself.

Forgetting that a second job has its own threshold

Each employment gets its own primary threshold, so two jobs paying £10,000 each will often generate very little national insurance, even though the same £20,000 from one employer would. This is legitimate, but it can produce a nasty surprise if you later consolidate into one role. It also does not work the same way for income tax, which is where second-job tax code confusion usually starts. Our guide to UK tax codes explained covers that side.

Using a calculator built for an old tax year

Rates have moved several times in the last few years, including a temporary levy, a mid-year rate cut, and reductions in the self-employed rates. A calculator that still assumes 12% or 13.25% will overstate your deduction badly. Always check which tax year the tool is set to before you trust the output.

Ignoring the effect of salary sacrifice on your record

Salary sacrifice reduces the earnings figure used for national insurance, which is the point. But if it takes your recorded earnings below the lower earnings limit, you could lose a qualifying year. This mainly affects part-time and low-hours workers, and it is worth a quick check before you sacrifice a large percentage of a modest salary.

Frequently Asked Questions

How much national insurance will I pay on £30,000?

On a £30,000 salary in 2026/27 you would pay £1,394.40 in employee national insurance across the year, which is about £116.20 a month. That is 8% of the £17,430 you earn above the £12,570 primary threshold. Your effective rate across the whole salary is roughly 4.6%, because the first £12,570 is free of national insurance entirely.

Do I pay national insurance if I earn under £12,570?

No. There is no employee national insurance due on earnings below the primary threshold of £12,570 a year, or £242 a week. However, if you earn above the lower earnings limit of £6,708 a year you are still credited with a qualifying year towards the State Pension, without paying anything. That protection is automatic and does not require you to apply for it.

Is national insurance the same as income tax?

No, they are separate charges with different thresholds, different rates and different rules. Income tax starts at the same £12,570 personal allowance but is charged at 20%, 40% and 45%, and it is calculated cumulatively across the tax year. National insurance is charged at 8% and 2% and is calculated on each pay period separately. You can also stop paying national insurance at State Pension age while still paying income tax.

Why did my national insurance go up when my salary did not?

The most common causes are a bonus, back pay, or extra overtime landing in a single pay period, which pushes that period’s earnings higher even though your annual salary has not changed. A second cause is a change in pay frequency, for example moving from four-weekly to monthly pay. If neither applies, check that your national insurance category letter on the payslip has not changed.

Can I get a refund of overpaid national insurance?

Sometimes. Refunds are possible where you have paid more than the annual maximum across multiple jobs, where the wrong category letter was applied, or where contributions were taken after you reached State Pension age. You claim these directly from HMRC rather than through your employer. Refunds are not available simply because your earnings were uneven across the year.

Do I still pay national insurance after State Pension age?

Employees stop paying Class 1 national insurance once they reach State Pension age, even if they carry on working. You need to show your employer proof of age so they can update your category letter. Your employer continues to pay their secondary contributions. Self-employed workers stop paying Class 4 from the start of the tax year after they reach State Pension age.

Understanding your deductions is one half of the equation. The other half is making sure the salary those deductions come out of is the right one for your skills. If your national insurance bill has made you realise how much of your gross pay you never see, it may be time to look at what else is out there. Browse the latest UK job vacancies on UK Jobs Alert and compare what employers are actually paying in your field this year.