@DominGA:
2016 tax software has very rudimentary estimates. And whatever it estimates, it will divide the total 2017 tax estimate by 4 and print out equal payment forms to send. There is no way to estimate varying tax payments by quarter. For example, if you have most of your income generated in last 4 months of the year, the Jan. 15, estimated tax should be much higher than the previous 3 quarters.
