If you mistakenly indicated to TurboTax that the amount in box 11 was not a distribution, (i.e., the amount in box 11 indicated an amount previously deferred that became vested during the year and therefore was being reported in box 11 because it was now subject to Social Security and Medicare taxes and was therefore not included in box 1, TurboTax would not have subtracted it form the box 1 amount when determining the amount of compensation that was eligible to support an IRA contribution. This would be a mistaken entry if the amount in box 11 was actually a distribution.
