About this site
About taxloss.co.uk and how we check our facts
taxloss.co.uk explains one corner of the UK tax system properly: what happens when you make a loss, and how to claim it.
What this site is
An independent, plain-English guide to tax losses for people in the UK — investors with a loss on shares, funds, property or cryptoassets; sole traders and partners whose business has had a bad year; landlords; and directors who want an overview of how company losses work.
taxloss.co.uk is an independent guide. It is not affiliated with, endorsed by or connected to HM Revenue & Customs (HMRC) or the UK Government. We are not accountants or tax advisers, and nothing here is personal advice. If your situation is complicated, or a lot of money is at stake, please get help.
How every guide is researched
- Primary sources only. We work from GOV.UK guidance, HMRC’s internal manuals (such as the Capital Gains Manual, Business Income Manual, Property Income Manual and Company Taxation Manual), HMRC helpsheets and return notes, and the legislation on legislation.gov.uk. We don’t rely on other websites’ summaries.
- Sources on the page. Every guide lists the pages it was written from, and every key figure links to its GOV.UK source. All of them are collected on our sources page.
- Dated checks. Each guide shows when it was last checked and which tax year it was checked for — currently 2026/27. Rates and allowances live in one key figures table so they can be updated in one place.
- Our own words. GOV.UK content is published under the Open Government Licence v3.0, which lets us adapt it with attribution. We rewrite it to be clearer, and we never copy HMRC’s forms or design. Contains public sector information licensed under the Open Government Licence v3.0.
- If we can’t verify it, we leave it out. Where the rules are uncertain or depend on facts we can’t see, we say so and point you to HMRC or an adviser.
About the calculators
The calculators apply the general rules described in the guides. The capital loss illustrator is tested against worked examples taken from HMRC’s own guidance. They are illustrations: they don’t know everything about your circumstances and they don’t work out your tax bill.
How the site is paid for
The site earns a little from affiliate links — mainly the Amazon.co.uk links in our small shop. That never changes what the guides say. Read our affiliate disclosure.
Found a mistake?
Tax rules change. If something here is out of date or wrong, please tell us — ideally with a link to the GOV.UK or HMRC page that shows it. We correct errors as soon as we can and update the “checked” date.