IL HB5443

Amends the Property Tax Code to allow county collectors in counties with 275,000 or more inhabitants to adopt a bidder rule permitting tax purchasers to register up to 8 related bidding entities, increased from the previous limit of 1.

Requires county treasurers to include a representation and warranty form in registration packages attesting to compliance with the bidder rule, though counties may opt out of this requirement by ordinance.

Defines "related bidding entity" as any individual or business organization sharing ownership interests, common partners, or a common financing guarantor with another registered participant in the tax sale.

Authorizes counties with fewer than 275,000 inhabitants to adopt the same bidder rule by ordinance at their discretion.

Prohibits registered tax buying entities from engaging in multiple bidding strategies for the purpose of colluding to receive higher penalty bid rates; determination of related entities rests with the county treasurer.