Self-employed individual 401k self, match, and profit sharing contribution limits?
I can only address this part of it: For instance with a 10k net income, 9293 is the limit for 401k from employee. How is this calculated? I believe this limit is total for all sources too, which I'm confused about. How it's calculated is that when you are self-employed you also pay the employer portion of the FICA taxes.  This comes off above the line and is not considered income.  The 401k contribution limit takes this into account.
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Self-employed individual 401k self, match, and profit sharing contribution limits?

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I can only address this part of it: For instance with a 10k net income, 9293 is the limit for 401k from employee. How is this calculated? I believe this limit is total for all sources too, which I'm confused about. How it's calculated is that when you are self-employed you also pay the employer portion of the FICA taxes.  This comes off above the line and is not considered income.  The 401k contribution limit takes this into account.