It’s Self Assessment time, most returns are filed online in December and January, here is some great advice from Ruth Owen from last year….
If you are late you will get penalties https://www.gov.uk/estimate-self-assessment-penalties
If you don’t have all the answers take a look at my 3 life savers
3 Self Assessment Life Savers – Estimates, Provisional and Corrections
If you don’t know where to send the payment this might help
steve@bicknells.net