Solved
box 1 shows 28,000.00
Box 2a "taxable amount" shows 12000.00
Because the amount in box 2a is less than the amount in box 1, this is apparently a distribution that is not from an IRA; the IRA/SEP/SIMPLE box is not marked. This means that the amount shown in box 1 must be included on line 5a of Form 1040 but only the amount shown in bx 2a is to be included on line 5b as taxable income. TurboTax will do this when you enter the Form 1099-R as received.
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