Self-employed National Insurance: what should I know?

A simple overview of how National Insurance fits into self-employed planning and how this calculator presents NIC related items.

This tool shows NIC components separately to make the estimate easier to understand.
NIC rules can vary by tax year; use the correct year in the calculator.
Verify NIC rules and terminology on GOV.UK.

How the calculator presents NIC

The self-employed calculator breaks down Income Tax and NIC so you can see what drives the total. This helps with planning and reduces confusion.

Enter annual profit after allowable expenses. Optional settings adjust parts of the estimate, but the core input remains profit.

Treating NIC as optional in all cases, or mixing up different NIC categories. Use GOV.UK as the reference.

Not tax advice. This page is an educational guide. For official rules, verify the sources below.

Last updated: 2026-04-20

Is NIC included in the total?

Yes. The estimate includes NIC components where applicable.

Do NIC rules change?

They can change by tax year. Use the correct year selection.

Where is the official NIC reference?

Use the GOV.UK self-employed National Insurance page.

For official rules and definitions, verify with the references below.