"I was not given the option to input in Turbotax "
You don't enter the earnings, the custodian has to calculate that for you and supply the amount in box 2a.
If you try to calculate yourself you will probably get the wrong result.
If you did not ask for "excess plus earnings" the custodian will not calculate earnings, and will not give you a code of "8".
all this assumes the custodian knows what they're doing.
@nn18
