The basis in 2012 was off by one year of contributions because we recharacterized 2010 contributions from Roth IRA to Traditional IRA when AGI was too high to contribute to Roth. Somehow, the 2010 contributions were not entered into the basis back then and have been missed ever since until I realized it this year. Wondering if we need to formally amend the 2012 return or just correct for 2020 going forward. The difference is just under $2,000, so its not a ridiculous amount of money.
