Hi AS2023, thanks for posting an event question.
As described, your writing side gig is reported on Schedule C, Profit or loss from Business. Income is from Form 1099 and you report all directly related out of pocket business expenses in generating this income. Net income is then taxed at your marginal income tax rate plus approx. 15.3% self employment tax.
Please examine and maximize all business expenses allowable.
About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship)
https://www.irs.gov/forms-pubs/about-schedule-c-form-1040
In additional to report ALL directly related business expenses, you can consider deducting retirement contributions, such as to a SEP IRA, which can be 20% of net earnings. Please also consider health insurance deduction from a plan in your name or your business name.
https://www.irs.gov/retirement-plans/retirement-plans-for-small-entities-and-self-employed
https://turbotax.intuit.com/tax-tips/home-ownership/deducting-health-insurance-premiums-if-youre-sel...
All the above would reduce your self employment net income subject to income tax and self employment tax.
Hope the above helps.
Thank you,
Kitty
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