Solved
Note: the answer provided elsewhere does not seem to work with the home and business download: https://ttlc.intuit.com/turbotax-support/en-us/help-article/retirement-benefits/enter-sep-ira-contributions/L836N7UBl_US_en_US?uid=ltwfaaoe
Using TurboTax Home and Business:
- Go to the Business tab at the top of the screen, click Continue and then I'll choose what I work on
- Scroll down to Less Common Business Situations
- Click Start or Update beside Self-employed Retirement to get started
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