Solo 401k Employer Contribution

[One Tough Puppy]

I have a solo 401k and I maxed out the employee contributions. But I won't be able to calculate the exact salary for the employer contribution until after the December 31st deadline. What happens if I go over the 25% employer contribution?

 

[HenryD]

You can make the employer contribution at any time up until you file your business tax return. I normally make most of my employer contribution between Dec 31 and filing my business return.

 

[njhowie]

I have a solo 401k and I maxed out the employee contributions. But I won't be able to calculate the exact salary for the employer contribution until after the December 31st deadline. What happens if I go over the 25% employer contribution?

The deadline is not December 31, but April 15 of the following year.

https://www.sensefinancial.com/solo401k/solo-401k-contribution/

A sole proprietor’s Solo 401(k) contributions for a profit-sharing component must be made by the tax-filing deadline (April 15, or October 15 if an extension was filed).

 

[Aerides]

I calculate mine when I'm doing my business taxes. HSA and SEP/IRA contributions can be made up until tax day the following year.