When your W-2 has a code U, V, W, X, Y, or Z, in Box 14, use the drop-down menu in Box 14 and choose that group of codes. This did not cause an error preventing e-filing when I tested it just now, both in Desktop and Online. If you used the drop-down menu selection, please provide more specifics about the error you saw.
From this help article:
Employers can put just about anything in box 14; it's a catch-all for items that don't have their own dedicated box on the W-2.
In TurboTax, enter the description from your W-2's box 14 on the first field in the row. Enter the dollar amount and select the correct tax category that goes with that description.
If none of the categories apply, scroll to the bottom of the list and choose Other (not classified). Don’t worry. We'll figure out if it impacts your return or not. If we need more information, we'll ask you.
If box 14 is blank, just skip over it. Don't enter a 0 for any blank boxes.
See this excerpt from the IRS instructions for Form W-2:
Employee business expense reimbursements. Reimbursements to employees for business expenses must be reported as follows.
• Generally, payments made under an accountable plan are excluded from the employee's gross income and are not reported on Form W-2. However, if you pay a per diem or mileage allowance and the amount paid for substantiated miles or days traveled exceeds the amount treated as substantiated under IRS rules, you must report as wages on Form W-2 the amount in excess of the amount treated as substantiated. The excess amount is subject to income tax withholding and social security and Medicare taxes (or railroad retirement taxes, if applicable). Report the amount treated as substantiated (that is, the nontaxable portion) in box 12 using code L. See the box 12 instructions for Code L—Substantiated employee business expense reimbursements. (Use box 14 if railroad retirement taxes apply.)
• Payments made under a nonaccountable plan are reported as wages on Form W-2 and are subject to federal income tax withholding and social security and Medicare taxes (or railroad retirement taxes, if applicable). (Use box 14 if railroad retirement taxes apply.) For more information on accountable plans, nonaccountable plans, amounts treated as substantiated under a per diem or mileage allowance, the standard mileage rate, the per diem substantiation method, and the high-low substantiation method, see Pub. 463, Travel, Gift, and Car Expenses; and section 5 of Pub. 15 (Circular E).
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