The IRS is not keeping a database of real estate transactions and birth records. Let alone modest charitable contributions or fluid household composition.
When the IRS audits you, they don’t come with their own evidence beyond the basic income reporting that yes, they could pre-fill into forms. It’s up to you to produce documentation that justifies your filing.
Our tax code is complicated. It relies on voluntary (but potentially audited) reporting and compliance. If you want to argue for a simpler tax code, great, but at the end of the day, either the IRS needs to collect a lot more data or we’re stuck with self-reporting.
Again, for 80% of filers, none of this matters. They have their one W2 and take the standard deduction. The only thing the IRS needs to know is what's on the W2 and their marriage status, which they absolutely do have because if you get the marriage status wrong they send you a letter (and it's a matter of public record anyway).
So for 80% of people, they would never have to fill out a tax form at all. They could just get the tax bill and have it auto-pay (or more likely auto-refund).
And for the next 10% of people, who only take a small set of deductions that you can take on top of the standard deduction, you don't need even a two page form, you just need a wizard that asks a few questions like TurboTax.
And then for the rest they can opt to fill out the regular forms if they don't agree with how the IRS calculated their bill. This is how it works in pretty much every other civilized country (and a lot of uncivilized ones too).
You're missing that those 80% are not the same people every year. The IRS definitely doesn't keep a database of who is married or not, nor are they scouring every counties database for changes. I'm not sure where you're getting the "they will just send you a letter" part.
Sounds fine to me. Sometimes you have a simple W-2. Sometimes you need to report life changes. "Efficiency" means those 20% figure it out when they have to.
When the IRS audits you, they don’t come with their own evidence beyond the basic income reporting that yes, they could pre-fill into forms. It’s up to you to produce documentation that justifies your filing.
Our tax code is complicated. It relies on voluntary (but potentially audited) reporting and compliance. If you want to argue for a simpler tax code, great, but at the end of the day, either the IRS needs to collect a lot more data or we’re stuck with self-reporting.