The first thing you need to do for how to find my utr number to locate your UTR number is look in documents like your self-assessment welcome letter or tax return statements that you’ve received from the official HMRC. Furthermore, if you are a HMRC online account holder, you would usually see the UTR number under your tax details. If you cannot find it, contact HMRC by phone or post, but make sure you give personal details for verification. However, the UTR number is critical for tax filing, financial transactions, and, for any other related activities as such, it must be kept safe. Indeed, without it, submitting a self-assessment tax return can become difficult.