Single-member LLC: how to report owner's 401(k) deferrals to IRS?

[UM1234]

Hi,

I have a single-member LLC, and this year I started a 401(k) profit sharing plan. For federal tax purposes, I'm treated as a sole proprietor and I file a Schedule C with Form 1040.

As a single-member LLC, I don't generate a W-2 for myself. So my question is: if I make 401(k) deferrals, do I need to report them to the IRS, and if so, how? For people receiving a W-2, 401(k) deferrals are reported in box 12.

Thank you very much!

[Bird]

They are deducted on your 1040, line 28.

[K2retire]

Don't forget to complete a deferral election form and keep it on file in case the IRS ever has questions.

[UM1234]

Thank you to all!