If it's anything like my situation, the Roth IRA custodian included the same amount in box 1 and 2a while also checking 2b. So I need to adjust the amount in 2a for the contributions to arrive at net income attributable, rather than the custodian's entry of the full box 1 amount. I'm not sure where else to do that within TurboTax other than 5329 or 8606 which are both not quite accessible directly
