Where do I enter my 401(k), 403(b), or TSP contribution and deduction?
by TurboTax • 
Updated July 29, 2026 8:33 AM
If you have a 401(k) or TSP through your employer, your contribution is reported in box 12 of your W-2 with the letter code D. TurboTax will handle the tax deduction for you.
If you have a 403(b), it'll also be reported in box 12, but with the letter code E or BB.
Don’t enter your contribution again in the retirement section, because it's already in your W-2.
Individual 401(k) plans for the self-employed (also called solo 401(k) or solo-K plans) are entered in the Other Business Situations section of Income & Expenses in TurboTax.
