The thing is, a letter of "Hey, you made an error in your return!" is scary as shit if you don't realize what you're looking at.
I flipped a digit in a return some years back, and they sent me a very long list of "X said A, but You said B" - it gets even longer because the "X said" bits have to include name, address, account ID's and such - so you as a taxpayer can at least look at each entry and say either. "X is wrong" or "Yup, I flipped a digit." (And they included all the matching entries.)
That being said, the time that happened, it did not require signing for a letter.
Still leaves you with your stomach in your throat and your heart somewhere around your kidneys.
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I flipped a digit in a return some years back, and they sent me a very long list of "X said A, but You said B" - it gets even longer because the "X said" bits have to include name, address, account ID's and such - so you as a taxpayer can at least look at each entry and say either. "X is wrong" or "Yup, I flipped a digit." (And they included all the matching entries.)
That being said, the time that happened, it did not require signing for a letter.
Still leaves you with your stomach in your throat and your heart somewhere around your kidneys.