Gazelle

Due to a temporary pay rise which has gone on much longer than expected, I have accidentally exceeded the amount that I should have paid into my pension over the past three previous financial years. I made contributions to my work pension and my SIPP. This has come to light after I had checked the value of the contributions that had been made to my work pension. I understand that I now need to pay tax on the excess contribution-but can’t work out how I would do this for each of the three years - and would be grateful for advice. Thanks