[twoodfin]

Again, look at the EITC eligibility. It includes information like which partner is supplying more than 50% of the support in a household. Primary residence qualification has a similar requirement. The IRS does not track anyone’s primary residence from year-to-year without the taxpayer telling them, and doesn’t assume they know. This is a good thing.

[toomuchtodo]

But they could, trivially, using homestead exemption public record data wrt primary residence. EITC can be an attestation online. I prefer systems that prevent tax fraud. If you want to prevent institutional overreach, that’s a governance issue, not “better they just can’t find the fraud.”