If a railroad W-2 includes additional Medicare tax in Box 14, that tax should be reported on Form 8959, Additional Medicare Tax on line 23.
Form 8959 is not directly editable in TaxSlayer Pro as the amounts it needs for its calculations flow into the form from elsewhere in the return.
To ensure the additional Medicare tax reported on a railroad W-2 in Box 14 flows to Form 8959 correctly, ensure the description in Box 14 in the W-2 entry window is RRADDMED. The actual W-2 the taxpayer received may use a different descriptive in Box 14, but use RRADDMED when entering the W-2 to ensure the amount flows to Form 8959 correctly.
Additional Information: