Self Assessment: general enquiries
Contact HMRC for advice on Self Assessment and to change your personal details.
Online
Find guidance on Self Assessment tax returns
The quickest way to get help is to chat with HMRC online. You can ask our digital assistant for help with:
- registering for Self Assessment
- ending Self Assessment
- filing your tax return and paying your bill
- appealing a penalty
- requesting a refund
- activation codes
If our digital assistant cannot help, you can ask to speak to an HMRC adviser if one is available.
If you’ve already contacted HMRC, you can check when you can expect a reply.
X (previously known as Twitter)
You can use X to ask HMRC questions. We cannot discuss specific cases or individual tax affairs, so please do not give any personal details.
Start your post with @HMRCcustomers
Opening times:
- Monday to Friday: 8am to 8pm
- Saturday: 8am to 4pm
Phone
Help with online services
Contact HMRC’s online services helpdesk if you:
- are having problems submitting your return online
- have lost your online service username or password
- get any error messages in your online account or on a form
Help with general enquiries
Get help from HMRC if you need extra support.
Telephone: 0300 200 3310
Outside UK: +44 161 931 9070
Opening times: Monday to Friday, 8am to 6pm. Closed bank holidays.
Post
You can write to HMRC if you have a Self Assessment query.
Find out how to make a complaint about HMRC or where to send letters if you’re not using Royal Mail.
Self Assessment
HM Revenue and Customs
BX9 1AS
United Kingdom