[cragfar]

They definitely don't have all that information. That was my point.

[jedberg]

But your point is wrong. In 87% of the cases, the IRS does have all the information. Even if you have donations or other deductions it doesn't matter, because 87% of people take the standard deduction since it's more than their itemized deductions.

And marriage and death records are public, as are probate. So they would have all of that too.

[cragfar]

There's really no point in continuing this discussion if you think the IRS is scraping data of every county in the US for marital status changes.