Hello talia19!
Thank you for your question(s). If you feel that your federal taxes that have been withheld from your paychecks (full-time W2 job) are not sufficient to cover the taxes that you owe for both your full-time job and the side projects, it is advisable for you to pay quarterly income taxes to the IRS in order to not be penalized with an underpayment penalty. Estimated taxes are paid on a quarterly basis - April 15, June 15, September 15 of the current year, and January 15 of the following year. So for your 2021 taxes, you can skip the final payment due date of January 15, 2022 if you will file your return and pay all of the tax due by February 1, 2022.
Please refer to the link below regarding paying estimated taxes:
https://turbotax.intuit.com/tax-tips/small-business-taxes/estimated-taxes-common-questions/L1luHqVdl
As for deducting your home/apartment on your taxes since you work from home, your home office must be the primary area where your business activities take place. You can only deduct the area in your home that you use exclusively and regularly as an office for conducting your business. Some of the home-related expenses that you are able to deduct include a portion of your mortgage interest, property taxes, homeowners insurance and some utilities. Please review the articles below for more information regarding working from home and setting up a home office:
https://turbotax.intuit.com/tax-tips/jobs-and-career/tax-tips-for-employees-who-work-at-home/L5AinJb...
https://turbotax.intuit.com/tax-tips/small-business-taxes/setting-up-a-home-office/L52go3hc0
Please let me know if this answers your questions, or if I can be of further assistance.
Thank you!
Shirleyh88
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