If you enter an amount into TurboTax from Form 1065 Schedule K-1 Box 13 Code R and then enter the amount on the next screen (Enter Code R Detail) as a 401(k) contribution, TurboTax will automatically carry the amount over as a self-employed retirement deduction on Form 1040, Schedule 1, line 15.
In other words, it will be deducted from your 1040 income but not directly against your K-1 income, i.e. it reduces your total taxable income instead of your net partnership income, which is generally the way such contributions are handled.
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