NI and other income

Hi. When you pay national insurance, is it only payable on earned income (from employment or profit from self employment)? Or is the amount you pay a percentage of earnings and other taxable income combined? Thank you

Hi,
You pay National insurance on earnings from employment, whether this is via PAYE operated by your employer or when you are registered as self employed earner.
You can find more information on National Insurance National Insurance: introduction: Overview 
Depending on the class of National Insurance Contributions (NICs) deducted see National Insurance: introduction: National Insurance classes 
They may or may not help towards your state pension entitlement and or when applying for benefits.
If you require a more in-depth personal answer you will need to write into the department for a liability decision.
Thank you.