Self-employed losses: what happens if profit is negative?

A beginner-friendly overview of business losses and why your final tax outcome may not match a simple profit estimate.

Loss rules can be complex; this page is a concept guide, not advice.
If profit is negative, the calculator may not reflect how losses are treated in filing.
Use GOV.UK as the source of truth and consider professional help if unsure.

Why a simple calculator struggles here

Loss relief can depend on timing, other income, and how you report. A traffic-first estimator focuses on common cases and may not model every outcome.

What to do instead

Use the calculator for positive profit planning. If you are in a loss position, rely on GOV.UK guidance and your filing method to understand the impact.

Common mistakes

Assuming a loss always means a refund, or assuming you can apply it in any way. The rules matter.

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

Open self-employed calculator How this is maintained

Last updated: 2026-04-20

FAQ

Can I enter a negative profit?

The tool is designed for simple estimates and may not reflect loss relief rules.

Does this mean I pay no tax?

Not necessarily. Your final outcome depends on your full situation.

Where do I verify the rules?

Use GOV.UK guidance on losses.

Sources

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

https://www.gov.uk/losses