83 of 85. Melvin timely filed his 2020 tax return on March 1, 2021. He was entitled to a $300 refund, which he received a few weeks later. Melvin later determined that he had failed to claim a refundable education credit for which he was eligible. The credit would have given him an even larger refund for that year. The latest Melvin can file an amended return to correct his originally filed 2020 return and claim the refundable credit is: March 1, 2023. The 2023 tax filing deadline (generally April 15). March 1, 2024. The 2024 tax filing deadline (generally April 15). Mark for follow up