Self Assessment Help and advice for customers completing their tax return and supplementary pages, or who need general advice about Self Assessment Please have your Unique Taxpayer Reference number with you when you phone Opening hours8.00 am to 8.00 pm, Monday to Friday 8.00 am to 4.00 pm Saturday Closed Sundays, Christmas Day, Boxing Day and New Year's Day 0845 900 0444 If you're calling from abroad please telephone:+44 161 931 9070
Post You can write to HMRC by using the postal address on the most recent correspondence from us.
If you don't have recent correspondence from us then write to: