Hi @JTABACK17 ,
Congrats on the new business!
To combine all your income together and get a good picture of what you are looking at for total tax liability, you should visit our TaxCaster. There, you can get an idea of what your total "underpayment" will be at the end of the year. When you are adding the income from your business, add your net income (after expenses). Your SEP contributions count as an expense toward this calculation.
As far as paying estimated taxes, here are the quarters and due dates of each payment:
| 1st Payment |
January 1 to March 31 |
April 15, 2021 |
| 2nd Payment |
April 1 to May 31 |
June 15, 2021 |
| 3rd Payment |
June 1 to August 31 |
September 15, 2021 |
| 4th Payment |
September 1 to December 31 |
January 18, 2022 |
So, if you haven't made any payments yet, you will want to make a payment that is as close to the underpayment you determined with the TaxCaster on or before January 18th. When you file your 2021 taxes, TurboTax will give you the opportunity to estimate your 2022 income so you can prepare vouchers to make more accurate estimated tax payments toward 2022.
The same schedule and advice above applies to your state as well.
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