There have been recent changes in the mechanics of how trusts function, including the Graduated Rate Estate (GRE) rules along with new rules in regard to which trusts are required to file a return every year regardless of whether or not there is income to be reported for trusts with taxation years ending after December 30, 2023. The deadline for filing those return is no later than 90 days after the trust's tax year-end. This is generally December 31. Therefore, trusts with a December 31, 2024, must file a T3 by March 31, 2025.