>This is a common misconception, especially on HN. For the average tax payer this might be truthy, but only insofar as the IRS is aware of certain tax events. If you had a kid, the IRS might be able to correlate that you and someone had a child, and they might, depending on the county registrar, be able to determine you're married. This gets even more complicated with business interests and finance in the small business realm.
The child tax credit and other tax credits are bad examples. The IRS isn't going to bust your front door open because you didn't take a tax credit. What would end up happening under the push tax system is:
IRS: "We think you owe $4,200.69 in taxes"
Parents: "Not so fast! We had quadruplets this year, we're taking a credit!"
IRS: "Yikes, we'll give you $2,000 this year as a refund, good luck."
(I obviously have no idea what the tax credit for quadruplets is, this is not tax advice.)
It just doesn't make sense that we need to ask these questions every tax year: "Did you have kids? Did you get married? How much money did you make according to the W2 your employer already sent us? What other income did you make according to the 1099s we were already sent by other institutions?"
All of this just so a small group of people can be... checks notes... reminded to take a child tax credit? They can always just put a cute little reminder about the various tax credits on the bill.
The only other examples are highly-regulated or people who are already operating under the table (in which case the IRS already doesn't know and the IRS will continue to not know). Business tax returns are almost always going to have to continue as the IRS pulling the information, but for normal people, tax returns should not be a burden.