If income was not reported on a W-2, then you are the self-employed small business owner. Without a W-2, you do this by filing a Schedule C. This can be a great thing though. Because not only do you have to report the income, you also get to deduct your expenses related to this income.
Where do I enter Schedule C?
What self-employed expenses can I deduct?
Note! Each payer must complete the Form 1099-MISC if during any year it pays you $600 or more.
What Is the IRS Form 1099-MISC?
https://turbotax.intuit.com/tax-tips/self-employment-taxes/what-is-the-irs-form-1099-misc/L4wLb4bej
