If you are retired but have some self-employment income, you will need online Premium software or any version of the desktop download in order to prepare a Schedule C for your business expenses. All of that income goes on the same tax return.
You will pay self-employment tax for Social Security and Medicare.
https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/...
https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/enter-schedule-...
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/enter-self-empl...
https://ttlc.intuit.com/turbotax-support/en-us/help-article/self-employment-taxes/self-employed-expe...
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