Did you know you can go back 3 years to optimize pension income splitting? You have up to three years to elect to split pension income, or to amend an election. With the effective due date for the 2019 return being September 30, 2020, one might think that the 2016 election could be amended up to the end of September 2020, but that’s not the case. Changes to the 2016 election had to be made by May 2, 2020 (three years after the due date for the 2016 return). However, changes to the election for 2017, 2018, and 2019 may still be made.