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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.

Any post sent to our previous postal address will be redirected to our new one.

We recommend using our online contact form to send us correspondence. If you have any questions, contact us.