Maximum National Insurance contributions calculator
If you earn income from more than employment or self-employment (including a share of partnership profit) in the same tax year, you are usually required to pay NI on each. This may result in you overpaying contributions, although it’s still possible to underpay, which could jeopardise your state pension rights.
Using the calculator
The calculation required to check NI contributions can involve a number of steps. Using the minimum data our calculator works out whether you have paid too much or too little NI and produces a report you can send to HMRC to support a claim for repayment, if appropriate.
Related Topics
-
Is it really the end of tax relief for homeworking?
In her 2025 Budget the Chancellor announced the end of tax deductions for “non-reimbursed homeworking expenses”. How might the loss of the deduction affect you and is there an alternative tax relief you can take advantage of?
-
HMRC threatens bogus penalties
Correspondence from HMRC suggests there's a penalty if you don't pay your self-assessment tax bill by Saturday, 31 January. This isn't strictly true, but what are your options if you can't pay on time?
-
HMRC updates guidance for claiming new allowance
Qualifying expenditure on plant and machinery can qualify for a 40% first-year allowance from 1 January 2026. HMRC has now updated its guidance to help make claims. What do you need to do?
This website uses both its own and third-party cookies to analyze our services and navigation on our website in order to improve its contents (analytical purposes: measure visits and sources of web traffic). The legal basis is the consent of the user, except in the case of basic cookies, which are essential to navigate this website.