Hi Sweetdesigner,
Estimated taxes are filed quarterly. Every 3 months, you'd send a check to the IRS. At year's end, you would keep total of all checks sent to the IRS and show them on your tax return. Turbotax will handle the rest for you.
Here is a link that has an extensive amount of information that could be very helpful to you.
https://www.irs.gov/pub/irs-prior/f1040es--2021.pdf
For context, Page 9 shows the 4th and final payment with the other three immediately after it.
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