Only use the dedicated line if you’re formally authorised to act on behalf of your client.
0300 200 3311
Monday to Friday: 8am to 8pm
Saturday: 8am to 4pm
Sunday: 9am to 5pm
Closed bank holidays.
Write to HMRC if you’re formally authorised to act on behalf of your client.
You do not need to include a street name or PO box.
Couriers should use a different address.
HM Revenue and Customs
Pay As You Earn and Self Assessment