Box 14 is considered
"Other", most commonly used for information to the
employee. You would have check with your HR department to find out
what that acronym means. I'm guessing maybe some kind of healthcare premium, but that's just a stab in the dark.
Some examples of
what might go in box 14 include state disability insurance taxes withheld,
union dues, uniform payments, health insurance premiums deducted, nontaxable
income, education/tuition reimbursement, or a minister's allowance.
As far as choosing what code to use, if none of the categories apply, scroll to the bottom of the list and choose Other–not on above list. Don’t worry. TurboTax will figure out if it impacts your return or not. If we need more information, we'll ask you later in the interview.