In this guide
4. Power of attorney
You need to have power of attorney over property and financial affairs to act for someone with us without them authorising you.
If you already hold power of attorney to act for someone, let us know by sending us a certified copy of the power of attorney by post to:
Welsh Revenue Authority
PO Box 108
Merthyr Tydfil
CF47 7DL
Once we receive this, we will only communicate with you around this person’s tax issues. Contact us for help with this process.
On 3 April 2023, our postal address changed to: Welsh Revenue Authority, PO Box 108, Merthyr Tydfil, CF47 7DL.
We recommend using our online contact form to send us correspondence. If you have any questions, contact us.