Self Assessment Contact Number: 0300 200 3310

You should phone the HMRC Self Assessment team on their local rate contact number 0300 200 3310 for enquiries about your tax returns form, for a SA302 calculation or for technical assistance if you are unable to login to your GOV.UK account.


Self Assessment Number – 0300 200 3310

Self Assessment is the name of the system used by HM Revenue and Customs (HMRC) to collect Income Tax. Although the tax is usually deducted automatically from wages, pensions and savings, self-employed workers or business owners will have to register for and file a Self Assessment tax return. You should therefore contact the HMRC on their Self Assessment enquiries number 0300 200 3310 for assistance completing and sending your form. However, it is essential that you have details of your National Insurance number and Self Assessment Unique Taxpayer Reference (UTR) ready when you phone. A member of the Self Assessment office can provide support to anyone who is unsure how to prove their income and the amount of tax they would consequentially have to pay. For instance, HMRC can provide assistance to anyone looking to get their SA302 tax calculation. Additionally, if you are uncertain of the necessary documentation that you will need to provide HMRC, whether a payslip or a P60 from your employer, you will be able to request assistance on this number. In addition, you can also contact the Self Assessment helpline to request a sample form, or to ask how to appoint someone to fill in and send your tax return, whether an accountant or relative. You should also call HMRC to report a change in your personal details, such as your name and address, which may accordingly affect your tax records. Finally, if you usually complete your Self Assessment tax returns online but are unable to login to your GOV.UK account then you should use this number for the necessary technical assistance, or simply, to update your email address and password.


Call Costs and Opening times

Contact numbers that start with the ’03’ prefix will cost the same per-minute rate as any local call made from a UK landline or mobile phone. However, the HMRC Self Assessment department will be free to contact if your landline deal includes free calls to local rate numbers or if your mobile tariff is bundled with inclusive free minutes. The Self Assessment office is available to take calls during the opening times of 8am-8pm Monday to Friday, 8am-4pm Saturdays and 9am-5pm on Sundays.


Self Assessment Phone Numbers

HMRC Department Contact Number
Self Assessment UK Number 0300 200 3310
Helpline for Calls outside the UK +44 161 931 9070


Self Assessment Twitter Account

The HMRC Twitter account is useful for anyone with general enquiries regarding Self Assessment. Although, customers can’t discuss their specific case online, you will be able to query the process of completing a returns form when writing to @HMRCcustomers during the hours of 8am to 10pm Monday to Saturday, and 9am to 10pm on Sundays.