@Derionnaa,
You are right about this not being easy! Yes, there are tax brackets that can help you determine your income tax rate: https://turbotax.intuit.com/tax-tips/irs-tax-return/current-federal-tax-rate-schedules/L7Bjs1EAD
And on the 1099 income, the best option is to make your best projection when planning your estimated taxes. However, when you see that your Self -Employment income changes from your projection, go through the calculations again to make changes to your estimated payments as needed. For example, if you have been estimating based on a certain profit expected, but then you have had cancellations etc, you do not have to send the same amount each quarter. You can even skip a quarter if your updated projection shows no income taxable after expenses. Does that help?
