SEHI Impact on SEP IRA calculation

[Amakia]

Self Employed - No Employees

Do I need to deduct my SEHI premiums from my Schedule C income to calculate the base for my 20% SEP IRA contribution amount?

[Bsch4477]

Both SEP contributions and SEHI reduce AGI but not Schedule C income. 

[Amakia]

Thank you!  TurboTax has always taken my Schedule C income and subtracted 1/2 of my self employment tax to get the base for calculating my max SEP IRA contribution @ 20%.  I recently saw on ChatGPT that you also need to subtract your deductible SEHI premiums from the Schedule C income to get the SEP IRA base.  That didn’t seem right to me and it’s not the way TurboTax does it.