I'm self-employed, SEP max limit is 25% of net earnings from self-employment. How is net earnings determined - net income, gross payments for services, or something else?

[gb1]

So, how does TT calculate the maximum?

There is a checkbox for Maximize. When selected, it computes a value. Could someone shed some light into what numbers are considered from Schedule C?   20% of Net Profit is not quite matching.

Thank you.

[Bsch4477]

See discussion. 
https://ttlc.intuit.com/community/retirement/discussion/sep-ira-limit-is-calculating-incorrectly-tur...