Get contact details if you have a query about:
You’ll usually have the option to contact HMRC through an online form, webchat, by phone or by post.
You can also use HMRC’s Welsh language services:
Make a complaint
Contact the relevant HM Revenue and Customs (HMRC) helpline if you’re unhappy with the service you’ve received. HMRC has guidance about how they’ll deal with your complaint and what happens next.
There’s a separate process for: