Guides: Self Assessment

Timeline for the 2026 to 2027 tax year: payments on account on 31 January and 31 July 2027, each half of last year's tax, and the balancing payment on 31 January 2028.

Self Assessment · Oct 12

Payments on Account: How HMRC's Advance Tax Bills Work

Who pays them, why the first January bill is so large, and what a reduction costs if the estimate is wrong.