Hi! Those are very awesome and thoughtful questions!
Great job filing quarterly sales tax.
You do no need an EIN#. You can file a Schedule C (self employed) using Turbo Tax Self-employed. You will only pay taxes on your income once. The Turbo tax program will ask if you have a business name. When you enter the income on your schedule C you can add all the income from all sources and all the expenses associated with your business.
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