Am I Paying Too Much National Insurance? How to check

How to check, claim refunds and protect your State Pension.

This article is for information only and is not financial advice. It’s written for a UK audience and based on official sources at the point of publication. Always do your own research or speak to a qualified financial adviser about your specific circumstances.

Start here: the quick checks

If you’ve ever thought, “am i paying too much national insurance?”, run through these fast steps:

1. Check your NI record & forecast – Sign into your Personal Tax Account to see contributions, credits, any gaps, and whether voluntary payments would improve your State Pension. GOV.UK+1
2. Compare what you paid to this year’s rates – For 2025/26, employees (Class 1) pay 8% between the Primary Threshold and the Upper Earnings Limit, then 2% above that. Employers pay 15%. Thresholds (weekly): £242 (primary), £967 (upper earnings). GOV.UK+1
3. Still working past State Pension age? Employees normally stop paying NI once they reach State Pension age—make sure payroll has updated your category. GOV.UK+1
4. More than one job / job + self-employment? You might exceed the annual maximum and be due a refund (or should apply to defer NI in the next year). Use HMRC’s refund checker. samuelfarrington.com
5. Self-employed? From April 2024, most people don’t need to pay Class 2; Class 4 main rate is 6% in 2025/26, 2% above the upper profits limit. Check and settle via Self Assessment by 31 January. GOV.UK+2GOV.UK+2

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What you should be paying in 2025/26 (headline numbers)

• Employees (Class 1): 8% on earnings from £242/week up to £967/week, then 2% above that. Employers pay 15% on earnings above £96/week (secondary threshold). GOV.UK
• Self-employed (Class 4): 6% between £12,570–£50,270 profits; 2% above £50,270. Class 2 generally not required from April 2024 (credits continue). GOV.UK
• Voluntary NI (to fill gaps): Class 2 £3.50/week and Class 3 £17.75/week in 2025/26. You can usually buy only the past six tax years (e.g., until 5 April 2031 for 2024/25). GOV.UK+1
• Full new State Pension: £230.25/week (2025/26) if you have enough qualifying years (usually 35), with at least 10 needed for anything. Check yours online.

Tip: If you’re still asking “am i paying too much national insurance” after comparing your payslips to the rates above, move to the refund steps below.

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How to double-check your position (step-by-step)

1. Find your NI number – On your payslip/P60 or via HMRC’s “Find your NI number” service (you’ll get a confirmation letter). GOV.UK
2. Open your Personal Tax Account – Review your National Insurance record, any NI credits (e.g., certain benefits, caring, etc.), and whether voluntary contributions would help. GOV.UK+1
3. Match payslip deductions to thresholds – Compare the NI taken on each payslip to the 2025/26 thresholds and percentages. GOV.UK
4. Check your employment status – If you’ve reached State Pension age, ask payroll to switch your NI category so you stop paying employee NI (your employer may still pay employer NI). GOV.UKLITRG
5. If you’re self-employed – Ensure your Self Assessment reflects profits correctly so Class 4 is calculated at 6%/2% and only voluntary Class 2 is paid if you choose to. Deadlines: file/pay by 31 January. GOV.UK+1

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Common overpayment scenarios (and fixes)

• You had multiple jobs (or jobs + self-employment): Combined NI can exceed the annual maximum. Use HMRC’s NI refund service to claim back previous tax years, and consider deferment for the current tax year so you don’t overpay again. samuelfarrington.com
• You worked past State Pension age: Employees normally stop paying NI at State Pension age (Class 4 for the self-employed stops from the 6 April after you reach it). If NI was deducted, ask payroll to correct and consider a refund claim. GOV.UK
• Wrong NI category letter / payroll error: Ask your employer (or payroll provider) to double check NI letters and thresholds for the current tax year. HMRC’s employer guide and tables set the rules. GOV.UKGOV.UK
• Self-employed paid Class 2 unnecessarily: From April 2024 most no longer need to pay Class 2; if you did and shouldn’t have, contact HMRC via the NI helpline. GOV.UK+1

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How to claim a National Insurance refund

Use HMRC’s online tool (“National Insurance: how to claim a refund”) to see if you’re eligible and how to apply. Some claims are time-limited, so don’t wait until the end of the tax year. samuelfarrington.com

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When paying voluntary contributions makes sense (and when it doesn’t)

• Check your State Pension forecast and NI record first; only pay if it actually increases your State Pension entitlement. GOV.UK
• 2025/26 voluntary rates: Class 2 £3.50/week (mainly self-employed with low profits) and Class 3 £17.75/week (anyone eligible to fill gaps). GOV.UK
• You usually have six tax years to backfill (e.g., you can pay for 2024/25 up to 5 April 2031). Consider seeking regulated financial advice before large voluntary payments. GOV.UK

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Special situations

• International students and new arrivals: If you’ll be working in the UK, apply online for a National Insurance number; NI is due if your monthly earnings pass the minimum threshold. (Northern Ireland has equivalent guidance via nidirect.) GOV.UK+1nidirect
• Statutory Sick Pay (SSP) and other benefits: Some benefits give National Insurance credits, helping your record in years you can’t work. Check your eligibility for credits. GOV.UK
• Small businesses & Employment Allowance: From April 2025 the Employment Allowance rose to £10,500, reducing many employers’ employers’ Class 1 NI bill. Eligibility rules apply. GOV.UK

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Useful tools & authoritative links

• Check NI record & forecast / make voluntary payments: GOV.UK — Check your National Insurance record and Voluntary National Insurance pages. GOV.UK+1
• Current NI rates & thresholds (2025/26): GOV.UK employer rates and HMRC national insurance rates pages. GOV.UK+1
• State Pension (full rate £230.25/week): GOV.UK — The new State Pension.
• Self-employed NI (Class 2 & 4): GOV.UK — Self-employed National Insurance rates. GOV.UK
• Claim a National Insurance refund: GOV.UK refund tool. samuelfarrington.com

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A note on MoneySavingExpert (MSE) resources

Martin Lewis’s MoneySavingExpert (a journalistic website, now part of the MONY (MoneySupermarket) Group) publishes step-by-step guides on NI, pensions and tax. Its stance is governed by a legally binding MSE Editorial Code, and you can sign up for the site’s free weekly email, browse MSE Forums for moneysaving discussions, or read Martin’s blog. As always, any deals or terms of products can change, so check privacy policy, Cookies Q&A, and full terms—and remember info is at your own risk and not a substitute for financial advice. MoneySavingExpert.com+2MoneySavingExpert.com+2

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FAQ

What’s the first step if I suspect an error on my payslip?
Compare the amount of National Insurance taken against the national insurance rates above, then contact payroll. If you’ve clearly overpaid, use HMRC’s national insurance refund route. GOV.UKsamuelfarrington.com

Will voluntary payments guarantee the full State Pension?
Only if they convert a non-qualifying year into a qualifying year and you’re under State Pension age. Always check your national insurance record first. GOV.UK

I run a company — does Employment Allowance help?
If eligible, it can reduce your national insurance bill by up to £10,500 in the current tax year. Review HMRC’s eligibility rules. GOV.UK

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Bottom line

If, after the checks above, you’re still wondering “am i paying too much national insurance”, gather your payslips, check your NI record, and use HMRC’s refund tool. If needed, pay voluntary contributions to secure your full new State Pension—but only after the numbers stack up for your specific circumstances. GOV.UKsamuelfarrington.com

This guide does not consider your personal allowance, income tax rates or other factors like higher rate band interactions in detail; for tailored planning, seek independent financial advice.