Why you need to tell HMRC
HMRC may send you letters about your tax code, P800 tax calculation notices, or requests for information. If these go to your old address, you might miss important updates — including tax refunds or underpayment notices. Keeping your address current ensures you stay on top of your tax affairs. Setting up Royal Mail redirection is a good safety net while you update all your addresses.
How to update your address online
The easiest way is through your HMRC Personal Tax Account at GOV.UK. Sign in (or create an account using Government Gateway), go to your profile, and update your address. The change is immediate. You can also update it via the HMRC app. Make sure the address matches what your employer has on file.
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If you prefer, you can call HMRC's Income Tax helpline on 0300 200 3300 (Monday to Friday, 8am to 6pm) or write to them. However, the online method is instant and avoids hold times. You'll need your National Insurance number when contacting them.