See responses below:
1st Question: No, you do not need to make all 4 estimates the same. You can prepare quarterly estimated tax calculations to make each payment.
2nd Question: it depends on your situation and your source of income. If your main source is W-2 wages, you should follow up with your payroll to make sure they are withholding correctly.
3rd Question: No your payments do not have to be the same.
See additional information in the link below:
Calculation of Federal Estimated Taxes
@mellynlee
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