Hello rafmarino,
Thanks for joining us today!
Your additional income will be subject to regular tax as well as self-employment tax. You can either make the Quarterly estimated tax payments or update your W4 (in case you have a regular W2 income), and increase your withholding from the W2 income.
Useful links below for more info:
https://ttlc.intuit.com/turbotax-support/en-us/help-article/business-tax-credits-deductions/starting...
https://www.irs.gov/pub/irs-pdf/p535.pdf
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