How do I set up rounding for my Estimates for 2025?

[null564]

I want to round each quarterly payment to the next $100 increment

[VolvoGirl]

I can do that in my Desktop program.  I don’t know about Online.   

In the Desktop program you can switch to Forms mode and open the Estimated Tax Payments Options sheet.  You can even select to print the estimates with just your personal info and no amounts.  You  can play with and tweak the amounts.  You can open the individual 1040ES forms and override the amounts.