If this income had been reported on a W-2, wouldn't FICA tax have been withheld? I think it is subject to FICA, even if it can be excluded for income tax.
In @DianeW777 description of how to enter, you encounter a screen "Enter Source of Other Earned Income".
Your choices are "Employee Compensation that was not reported on a W-2" or "Other". If you choose "Employee Compensation that was not reported on a W-2", form 8919 will be generated to calculate FICA tax. If you choose "Other" the income will go on line 1 of form 1040 as earned income, but no FICA will be charged.
