In this guide, we’ll explain what your UTR number is, when you’ll need it, and most importantly — where to find it. We'll also cover what to do if you've lost it and how to keep it secure.

If you've made a profit from gambling — whether through betting, poker, online casinos, or even sports trading — you might be wondering if you owe anything to HMRC.

Updated for the 2025/26 tax year | Expertly reviewed by qualified UK tax professionals.