All income received is reported on a tax return. If you are self-employed then you report the bonus as income. If the bonus is not reported to you on a Form 1099-NEC then you report the bonus as Cash income.
All of your income must be reported on your tax return, whether you think it was a "bonus" or "normal" earnings
SELF EMPLOYMENT INCOME/“side jobs”
https://ttlc.intuit.com/questions/2926899-how-does-my-side-job-affect-my-taxes
https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922
https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax
https://ttlc.intuit.com/questions/1901340-where-do-i-enter-schedule-c
https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct
https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs