In the olden days, the Revenue sent out payslips together with a handy prepaid envelope just before the liability became due. The payslips are still being issued, but now you have to stick a stamp on the envelope. The Revenue really don't want you to pay by post anymore, they'd like you to set up a direct debit to allow them to help themselves. Not many have taken that option, but most find paying electronically more convenient that writing cheques. This link sets out them alternative electronic methods of payment: Paying HMRC. Please note that the Revenue changed their bank account on 6th April 2009 and have now opened accounts with Citi and RBS, so if you already pay self-assessment, corporation tax or PAYE electronically, you may need to change existing BACS details.