Hi Jacobmx,
As a self-employed individual, generally you are required to file an annual return and pay estimated tax quarterly. Before you can determine if you are subject to self-employment tax and income tax, you must figure your net profit or net loss from your business. You do this by subtracting your business expenses from your business income
https://www.irs.gov/businesses/small-businesses-self-employed/self-employed-individuals-tax-center
Estimated tax is the method used to pay tax on income that is not subject to withholding (for example, earnings from self-employment, interest, dividends, rents, alimony, etc.). Use Form 1040-ES to figure and pay your estimated tax
https://www.irs.gov/forms-pubs/about-form-1040-es
Hope this helps,
Ron G