National Insurance Calculator
National Insurance is deducted from almost every payslip, but two things about it are widely misunderstood: your employer pays a separate NI contribution on top of yours that never appears on your payslip at all, and the contributions you make genuinely determine your entitlement to the State Pension later in life, not just fund government spending in the abstract. This calculator works out your own NI contribution for 2026/27, alongside the employer contribution most people never see.
National Insurance Calculator
Calculate your National Insurance contributions for 2026/27. Class 1 (employed) and Class 4 (self-employed).
The NI Your Payslip Never Shows You
Beyond the employee NI deducted from your pay, your employer pays their own separate National Insurance contribution on top, currently 15% on your earnings above a £5,000 annual threshold — a genuine cost of employing you that never appears on your payslip, since it is paid directly by the employer rather than deducted from your salary. This calculator shows this employer contribution alongside your own, since understanding the full cost of employment, not just what is visibly deducted from your pay, gives a more complete picture of where the money in the employment relationship actually goes.
This is worth being aware of specifically in the context of salary negotiations or understanding a job offer’s true cost to an employer — the number on your contract is not the full picture of what employing you actually costs, and employer NI is a meaningful, often overlooked part of that fuller total.
Seeing the Employer’s Share in Real Pounds
On a £45,000 salary, employee NI comes to roughly £2,594 for the year. Employer NI on the same salary, at 15% above the £5,000 threshold, comes to roughly £6,000 — more than double what the employee themselves pays, and entirely invisible on a standard payslip. This is genuinely one of the largest employment-related costs most employees never see broken out, since it is paid separately by the employer rather than deducted from gross pay.
Why National Insurance Isn’t Really About Insurance Anymore
National Insurance began as a genuine contributory insurance scheme, and while it now functions largely like general taxation in practice, one meaningful link to its original purpose remains: your National Insurance record directly determines your entitlement to the State Pension. You typically need 35 qualifying years of contributions for the full new State Pension, and at least 10 years for any State Pension at all — a genuinely important, concrete consequence of paying (or not paying) NI over your working life, not merely an abstract deduction with no personal benefit attached.
This is genuinely worth keeping in view across a full working life, particularly through career breaks, periods of self-employment with low profits, or time spent abroad, since these are exactly the situations where a gap in qualifying years can quietly accumulate without anyone actively noticing until checking the record much later.
The Flat-Rate Charge Hidden Inside Self-Employed NI
Self-employed National Insurance is not purely percentage-based the way employee NI is — alongside Class 4 NI, charged at 6% on profits within the standard band and 2% above it, self-employed individuals also pay Class 2 NI, a flat weekly charge of £3.65 regardless of profit level, provided profits exceed a lower threshold. This flat-rate element is easy to overlook when estimating self-employed NI from the percentage rates alone, but it is a genuine, separate charge that adds up over a full year and, importantly, is what actually builds qualifying years toward the State Pension for self-employed individuals specifically.
Across a full year, £3.65 a week works out to roughly £190, a modest but genuinely meaningful amount for a self-employed person operating on tight margins, and one worth budgeting for specifically rather than being surprised by it separately from the percentage-based Class 4 charge.
What Happens If You Have a Gap Year
A year where you do not pay enough NI — through unemployment, low earnings, or time spent caring for family without qualifying credits — can leave a gap in your NI record, potentially reducing your eventual State Pension below the full amount if enough gap years accumulate. Voluntary Class 3 NI contributions exist specifically to fill genuine gaps retroactively in some circumstances, which is worth investigating through your personal NI record on GOV.UK if you suspect you may have gaps, particularly after a period of unemployment, low self-employed profits, or time abroad. Our Income Tax and NI Combined Calculator is useful for seeing NI alongside income tax in one combined view, and our Pension Calculator is worth checking for the wider picture of retirement income planning beyond the State Pension alone.
Frequently Asked Questions
Do I stop paying National Insurance at a certain age?
Yes — employees stop paying Class 1 NI once they reach State Pension age, even if they continue working, though employer NI contributions on their earnings still continue to apply.
Can I check how many qualifying years I already have?
Yes — your personal NI record, including qualifying years to date and a State Pension forecast, is available directly through your Personal Tax Account on GOV.UK, and is worth checking periodically rather than assuming your record is complete.
Does NI apply to pension income?
No — National Insurance is not charged on pension income, whether State Pension or private pension income, which is one genuine difference from earned income during working life.
Why does my employer’s NI contribution matter to me if I do not pay it?
It represents a genuine cost of employing you that indirectly factors into overall employment costs and, at the margin, can influence salary negotiations or how an employer structures pay and benefits, even though it is not directly deducted from your own pay.
Is it worth paying voluntary Class 3 contributions to fill a gap?
Often yes, if the gap would otherwise reduce your eventual State Pension, since the cost of filling a gap is frequently modest compared with the additional State Pension income it can secure over a full retirement, though this is worth checking against your specific circumstances rather than assumed universally.
Important Information
This calculator provides an estimate based on standard 2026/27 National Insurance rates for general information purposes only and does not constitute tax or pension advice. For advice specific to your circumstances, consult HMRC, the Future Pension Centre, or a qualified adviser. See our Disclaimer for further information.