Yes, you will pay on the prorated amount of your earnings within Louisville Metro. On page 2 of the OL-3 form, you will list the total gross income that you earned both outside and inside of Jefferson County. That percentage will be applied against your net self-employment income (after expenses have been subtracted from your gross income). You will pay 1.45% tax on this amount if you are not a resident of Louisville Metro and 2.2% tax if you are.
Unfortunately, the OL-3 form is not in TurboTax, so here is a link to assist you (click here): OL-3
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