Section 125 fringe benefits are pre-tax deductions such as a Flexible Spending Account for out-of-pocket medical expenses and childcare expenses, life insurance and commuter reimbursement.
These benefits are pre-tax so they are not deductible.
If you have a SEC 125 amount in Box 14 of your W-2 use Other (not classified) unless you live in New York. If so, use SEC 125/SEC 18 Subject to NY tax or NY tax exempt