[Bobbyvotes]

I have used HR Block software for 5 years with no issues.
Last year I paid underpayment of estimated tax based on what HRB software came up with and paid on time in April. 3 months later I get a check in mail from IRS saying I had overpaid the penalty.

Goes to show you nothing is fool-proof.

[Raycpa]

. 3 months later I get a check in mail from IRS saying I had overpaid the penalty.

Due to covid, many otherwise correct penalties were forgiven retroactively.