But only if it is for your own self employment business. If you are a W2 employee you only enter 401K from your W2 box 12. Nowhere else.
401K (But not ROTH 401K) come out of your checks pretax and have already been deducted from the wages in box 1 and you can't deduct it again. See box 1 should be less than boxes 3&5.
