Pretty bold of you to assume the IRS or state DOR is always accurate. I have an example of what a client is going through, right now for tax year 2023. When the returns were efiled, they were rejected because their SS numbers already showed on a previously filed tax return for the same year. They are now forced to paper file. No big deal, just an inconvenience. They just received a notice from the state DOR stating they corrected their tax return to reflect the increased health care penalty (for NOT having proper health coverage). That penalty is almost $2300, EACH. The problem is, their paper filed return hasn't been processed yet, and they DO have the proper coverage and indicated as such on their return. They also have proof from the provider showing the proper coverage for the year. However, without paying "some accountant" hundreds of dollars, they should just pay the $4600, because the DOR said they should? And for what it's worth, they have "basic sources of income/expenses".
But hey, if you'd rather pay an extra $4600 instead of a professional for their knowledge and experience, I understand.