I am a partner in a LLP, where do I deduct contributions made to a 401K plan?

[MichaelL1]

You will go to Business Tab in TurboTax, 

You will see Business Income and Expenses

Scroll to bottom to Less Common Business Situations

Then go to Self-Employed Retirement

There continue, and make entry for 401K

Note:  This is only made here if you are not an employee of LLP as otherwise the 401K deduction is already reflected in the W-2.