The arrival of 2021, as welcome as it was, put a hard stop on most moves by Americans to lower their 2020 tax bills. The window for things like making charitable donations or taking capital losses to offset gains slammed shut on December 31.
But there are still a few things people can do now to cut last year’s taxes. Several involve contributions to retirement accounts, with deadlines as late as Oct. 15. Another could reduce penalties for filers behind on last year’s tax payments.