Hi Onekeano. Firstly, I am assuming that the 40,000 pension includes any State Pension. The approx tax payable on 40,000 would be about x. ( 32,800@ 20%, 7,200 @41%, =9,512. less Credits 2,1900 widow, 1,650 PAYE gives Tax payable of 5,672.
So, in answer to your direct question, this (5,672) is...