ICTA 1988 S. 641A allows for pension contributions to be treated as paid in the previous tax year, (if paid by 31 January). This is done by completing a form PP43.
S. 641A refers to a person paying a contribution, and a person in tax law can usually mean an individual or a company. However the wording of the notes on form PP43 appear to indicate that only an individual can make this election in respect of net contributions he has paid himself.
Rebecca Cave