Today I discovered an egregious error in my wife's 2019 tax filings, back when she was single. Essentially, she failed to claim the $250k capital gains exemption on the sale of her home that year, and paid approximately 25% of the gains (15% federal, 10% state) in taxes.
From what I've read, even if we filed a paper 2019 amended return (1040-X) by mail, along with the state equivalent, it's too late to receive any refund because more than three years have elapsed. Is that correct? If so, is there any legal adjustment we can make on our 2025 Married Filed Jointly return?
