S corp 401(k) profit sharing contribution calculation

S-Corporation. 1 owner. Owner grossed around 400K for the year. So far, has W2 wages of 25K.

Due to Secure act, I can still open a 401(k) up until tax filing deadline. However, only profit sharing contributions can be made. Are the profit sharing contributions based on W2 income, or the K-1?



The PF contribution is limited to 25% of W-2 income. K-1 income cannot be used. The S Corp filing deadline is 3/15, or 9/15 with a filed extension.



An S-Corp 2% shareholder-employee must receive reasonable compensation.



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