[devoply]

Where do they get household income from?

[nommm-nommm]

Some employers report employment status/income of all their employees to private companies who keep databases. Those databases are used for this sorta thing as well as background checks.

I can't remember the name of the specific database I am thinking of that I know exists, I think its owned by LexisNexis and LexisNexis advertises they have this information - https://www.lexisnexis.com/government/solutions/literature/s...

You also self report your income to credit card companies.

[DashRattlesnake]

My guess is from sources like credit card or loan applications.

https://www.nerdwallet.com/blog/credit-cards/report-income-c...