Per the IRS Instructions for Schedule SE, page SE-5:
Income and Losses Not Included in Net Earnings From Self Employment
2. Fees received for services per-formed as a notary public. If you had no other income subject to SE tax, enter "Exempt—Notary" on Schedule 2 (Form 1040 or 1040-SR), line 4. Don’t file Schedule SE. However, if you had other earnings of $400 or more subject to SE tax, enter “Exempt—Notary” and the amount of your net profit as a notary public from Schedule C on the dotted line to the left of Schedule SE, line 3. Subtract that amount from the total of lines 1a, 1b, and 2, and enter the result on line 3.
To enter or edit your notary income or expenses on Schedule C in TaxAct:
After you enter the income, enter an adjustment on Schedule SE since notary public income is not subject to self-employment tax.
To enter exempt notary income on Schedule SE (this amount will transfer to Schedule SE, Part I, Line 3, which will affect the amount of self-employment tax on Schedule 2 (Form 1040) Line 4: