You can definitely cancel a payment that was scheduled when you e-filed, but you must do it at least 2 days before it was supposed to be paid and 7 or more days after filing.
I filed early and owed over $1,200 but after the $10,200 unemployment exemption was passed, I will only owe a little bit over $100, so I cancelled my payment that was scheduled for April 15th and now when I look at my balance due in my IRS account for the 2020 tax year, it gives me this message:
Your Information Is Not Available at This Time
If you requested an adjustment to your account your information will not be available until that transaction is complete.
So, I have my fingers crossed that they'll get it recalculated before May 17th.
