National Insurance Calculator (2026/27)
National Insurance, Income Tax, and your combined take-home pay. Enter your salary — no button, results update as you type.
National Insurance uses the exact threshold for whichever period you choose — not a scaled-down annual figure. See “Why your monthly figure isn’t annual÷12” below.
National Insurance Calculator (2026/27)
This calculator works out your 2026/27 National Insurance, combines it with Income Tax, and shows genuine take-home pay — completing the picture our UK Income Tax Calculator deliberately left out. Enter your salary and the numbers update immediately. It uses the exact National Insurance threshold published for whichever pay period you choose — annual, monthly, or weekly — rather than the common shortcut of just scaling down an annual figure, which produces a subtly different (and less accurate) answer for anyone not paid annually.
2026/27 National Insurance Rates and Thresholds
| Threshold | Annual | Monthly | Weekly |
|---|---|---|---|
| Primary Threshold (NI-free up to here) | £12,570 | £1,048 | £242 |
| Upper Earnings Limit (8% up to here) | £50,270 | £4,189 | £967 |
Above the Primary Threshold, you pay 8% up to the Upper Earnings Limit, then 2% on everything above that — with no upper cap. These rates and thresholds are identical everywhere in the UK, including Scotland; only Income Tax varies by region.
Why Your Monthly Figure Isn’t Just Annual ÷ 12
Look closely at the numbers above: £1,048 × 12 = £12,576, not £12,570. That’s not a mistake — HMRC’s monthly threshold is one-twelfth of the annual figure (£1,047.50), rounded up to a whole pound, and the weekly figure follows the same convention. More importantly, National Insurance is worked out separately for each pay period, with no annual catch-up the way Income Tax has through your tax code. That means someone paid unevenly across the year — a big bonus in one month, a mid-year raise — can end up with a slightly different total annual National Insurance bill than someone earning the identical salary paid in perfectly even instalments. This calculator uses the correct period-native threshold for whatever entry mode you choose, rather than always converting through the annual figure, which is the more accurate way to reflect how a real payslip actually calculates it.
Why This Might Differ Slightly From HMRC’s Own Online Estimator
If you’ve used HMRC’s own “Estimate your Income Tax” tool and compared it to this calculator with a monthly or weekly salary, you might spot a few-pence difference in the National Insurance figure — and it’s worth explaining rather than leaving as a mystery. HMRC’s own estimator tool doesn’t use the whole-pound £1,048/£242 thresholds published on its own employer guidance page; it uses the precise mathematical twelfth or fifty-second of the annual figure instead (£1,047.50/month, £241.73/week). That’s a perfectly reasonable choice for a quick, simple whole-year estimate.
This calculator deliberately uses the whole-pound thresholds instead, because those are what real payroll software actually applies to a real payslip — they’re the figures published specifically for employers to use when calculating deductions, not just an internal approximation. The gap is tiny (a few pence a month at most salary levels) but the reasoning is the difference between “what a clean annual estimate looks like” and “what your actual payslip will show.”
Employer National Insurance
Your employer pays National Insurance too — separately from what comes out of your pay. Above £5,000/year (£417/month, £96/week), employers pay 15% on your earnings, with no upper limit or reduced band. Many small employers can reduce this bill using the Employment Allowance (£10,500/year for 2026/27), which offsets their total National Insurance cost across their whole payroll rather than being calculated per employee — this calculator can show you the employer-cost figure for your own salary, but doesn’t attempt to model the Employment Allowance itself, since it’s an employer-wide relief, not a per-employee one.
How We Calculate Your Take-Home Pay
- Work out National Insurance using the threshold for your chosen pay period (annual, monthly, or weekly) directly — 8% between the Primary Threshold and Upper Earnings Limit, 2% above.
- Separately, work out Income Tax using the same Personal Allowance, taper, and rUK/Scotland bands as our Income Tax Calculator.
- Take-home pay = gross salary − Income Tax − National Insurance.
Worked Example
Someone earning £40,000/year in England pays £5,486.00 Income Tax and £2,194.40 National Insurance, leaving £32,319.60 take-home pay a year — £2,693.30 a month. The same salary in Scotland pays slightly more Income Tax (£5,551.07, since Scotland’s Intermediate rate kicks in above £29,526) but identical National Insurance, since National Insurance never varies by region — leaving £32,254.53 take-home, £65.07 less than in England on the same gross salary.
Now compare entry modes on a different salary: £36,000/year entered as “Annual” gives £1,874.40 National Insurance for the year. Enter the same salary as “£3,000/month” instead and this calculator returns £156.16 for that month — £1,873.92 once multiplied by twelve, a full £0.48 less than the annual-entry figure. Neither number is wrong; they’re answering slightly different questions, and it’s exactly the kind of gap explained in more detail below.
Who Should Use This Calculator?
Anyone who wants their real take-home pay, not just an Income Tax estimate — useful before accepting a job offer, comparing a pay rise against the actual amount that lands in your account, or checking a payslip. It covers standard Category A employee National Insurance on salary/employment income only — it doesn’t model self-employment (Class 2/4 National Insurance is covered separately by our Self Assessment Tax Calculator), non-standard NI categories (apprentices, under-21s, veterans), or salary sacrifice, which reduces National Insurance as well as Income Tax and isn’t modeled here. It also assumes a single, ongoing job — anyone with more than one employer at once should check each job’s National Insurance separately, since the Primary Threshold applies per job, not once across all of them combined.
Important Tax-Year Information
Tax year: 2026/27. Last verified against official sources: 2026-09-11. National Insurance thresholds and rates are reviewed independently of Income Tax and can change on their own schedule.
Official Sources
- GOV.UK — Rates and thresholds for employers 2026 to 2027
- GOV.UK — Income Tax rates and Personal Allowances
- GOV.UK — Income Tax in Scotland
Frequently Asked Questions
What are the National Insurance rates for 2026/27?
8% between £12,570 and £50,270 a year (or the equivalent monthly/weekly thresholds), 2% above that, 0% below the Primary Threshold.
Why does my monthly National Insurance not exactly match dividing my annual figure by 12?
National Insurance is calculated per pay period using its own threshold, not as a share of an annual figure — the monthly threshold is a rounded-up twelfth of the annual one, not an exact division.
Does my employer pay National Insurance too?
Yes, separately — 15% above £5,000/year, not deducted from your pay.
Is National Insurance the same in Scotland as in England?
Yes, identical everywhere in the UK — only Income Tax differs by region.
Why does this differ slightly from HMRC’s own online estimator?
HMRC’s own tool uses the precise mathematical twelfth/fifty-second of the annual threshold internally, while this calculator uses the whole-pound monthly/weekly thresholds published for real payroll use — a small, deliberate difference explained above, not an error in either tool.
This calculator provides an estimate based on the rules stated above. It models standard Category A employee National Insurance on salary income only — not self-employment, non-standard NI categories, salary sacrifice, or the Employment Allowance — and assumes a flat, unchanging salary paid evenly across the year. Your actual National Insurance may differ for irregular or changing pay. Check GOV.UK or a qualified adviser for advice about your specific situation.
