HM Revenue & Customs (HMRC)
HM Revenue & Customs (HMRC) Self Assessment Online Services provides support for tax and self-assessment queries specifically for individuals using textphone services. This includes assistance with filing, registration, technical issues, and account management. The service operates Monday to Friday, from 8am to 6pm UK time, and is closed on bank holidays. Callers should expect potential wait times, particularly during peak tax season and midday hours. For quicker responses, HMRC recommends using online services or their digital assistant. The textphone service is designed for users with hearing or speech difficulties.
Updated 4 Nov 2025
Expected outcomes
- Get help with tax filing
- Resolve registration issues
- Address technical problems
- Manage tax account details
- Verify personal information
Call preparation
Assemble everything before you dial. These requirements are verified by our call analysts and updated as organizations change their scripts.
- Textphone device
- Unique Taxpayer Reference
- Personal identification details
- National Insurance number
- Name and address
- Date of birth
Known issues
Callers to HMRC's Self Assessment Online Services often experience long wait times, especially during peak tax season and midday hours. It is advisable to call early in the morning or use online services to avoid delays. Additionally, some phone lines may have reduced hours or be closed during certain parts of the year, so checking the official website for current opening times is recommended. These issues are frequent and can cause frustration, but planning ahead and using digital resources can help mitigate these challenges.
