Illinois · House Bill · 104th General Assembly (2025–2026)
HB1427
Illinois HB 1427 — Prohibition of Algorithmics in Rent Act

Status ● Introduced Effective N/A Passage Likelihood L

WHAT THIS BILL REGULATES · 1 REQUIREMENT TYPE

How Is This Bill Enforced

Enforcement Authority
Enforcement through the Illinois Consumer Fraud and Deceptive Business Practices Act (815 ILCS 505). The Attorney General is the primary enforcer. The Consumer Fraud Act also permits private actions by persons who suffer actual damage as a result of a violation.
Private Right of Action
Enforcement through the Illinois Consumer Fraud and Deceptive Business Practices Act (815 ILCS 505). The Attorney General is the primary enforcer. The Consumer Fraud Act also permits private actions by persons who suffer actual damage as a result of a violation.
Penalties
Remedies are those available under the Illinois Consumer Fraud and Deceptive Business Practices Act (815 ILCS 505), which provides for actual damages, injunctive relief, and reasonable attorney's fees for private plaintiffs. The Attorney General may seek civil penalties up to $50,000 per violation, injunctive relief, and restitution. Punitive damages may be available under the Consumer Fraud Act framework.

What This Bill Requires

Verbatim statutory text on the left; plain-language analysis and a per-section checklist on the right. Numbered markers cross-link to the matching checklist row.

Statutory Text
Analysis & Obligations
Section 1
Short title

This Act may be cited as the Prohibition of Algorithmics in RentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 Act.

Establishes the short title of the Act as the Prohibition of Algorithmics in Rent Act. No operative obligations.

Section 5
Legislative intent

The General Assembly finds that, with certain exceptions, the use of an algorithmic deviceAlgorithmic device"Algorithmic device" means a device that uses one or more algorithms to perform calculations of data, including data concerning local or statewide rent amounts being charged to tenants by landlords, for the purpose of advising a landlord concerning the amount of rent that the landlord may consider charging a tenant. It includes a product that incorporates an algorithmic device but does not include: (1) any report published periodically, but no more frequently than monthly, by a trade association that receives renter data and publishes it in an aggregated and anonymous manner; or (2) a product used for the purpose of establishing rent or income limits in accordance with the affordable housing program guidelines of a local government, the State, the federal government, or other political subdivision.Section 10 by a landlord to set the amount of a residential tenant's rentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 should be prohibited because the use of algorithmic devicesAlgorithmic device"Algorithmic device" means a device that uses one or more algorithms to perform calculations of data, including data concerning local or statewide rent amounts being charged to tenants by landlords, for the purpose of advising a landlord concerning the amount of rent that the landlord may consider charging a tenant. It includes a product that incorporates an algorithmic device but does not include: (1) any report published periodically, but no more frequently than monthly, by a trade association that receives renter data and publishes it in an aggregated and anonymous manner; or (2) a product used for the purpose of establishing rent or income limits in accordance with the affordable housing program guidelines of a local government, the State, the federal government, or other political subdivision.Section 10: (1) has been the subject of lawsuits that allege such products pose a heightened risk of anticompetitive conduct, price fixing, and collusion, all of which allegedly result in higher rentsRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 for residential tenants; and (2) allegedly poses the risk that landlords will outsource pricing decisions, which the General Assembly finds should always be made by the landlord.

States the General Assembly's findings motivating the bill: that algorithmic rent-pricing devices have been the subject of lawsuits alleging anticompetitive conduct, price fixing, and collusion resulting in higher residential rents, and that they risk outsourcing pricing decisions that the legislature believes should remain with the landlord. This section creates no operative obligation.

Section 10
Definitions

"Algorithmic deviceAlgorithmic device"Algorithmic device" means a device that uses one or more algorithms to perform calculations of data, including data concerning local or statewide rent amounts being charged to tenants by landlords, for the purpose of advising a landlord concerning the amount of rent that the landlord may consider charging a tenant. It includes a product that incorporates an algorithmic device but does not include: (1) any report published periodically, but no more frequently than monthly, by a trade association that receives renter data and publishes it in an aggregated and anonymous manner; or (2) a product used for the purpose of establishing rent or income limits in accordance with the affordable housing program guidelines of a local government, the State, the federal government, or other political subdivision.Section 10" means a device that uses one or more algorithms to perform calculations of data, including data concerning local or statewide rentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 amounts being charged to tenants by landlords, for the purpose of advising a landlord concerning the amount of rentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 that the landlord may consider charging a tenant. It includes a product that incorporates an algorithmic deviceAlgorithmic device"Algorithmic device" means a device that uses one or more algorithms to perform calculations of data, including data concerning local or statewide rent amounts being charged to tenants by landlords, for the purpose of advising a landlord concerning the amount of rent that the landlord may consider charging a tenant. It includes a product that incorporates an algorithmic device but does not include: (1) any report published periodically, but no more frequently than monthly, by a trade association that receives renter data and publishes it in an aggregated and anonymous manner; or (2) a product used for the purpose of establishing rent or income limits in accordance with the affordable housing program guidelines of a local government, the State, the federal government, or other political subdivision.Section 10 but does not include: (1) any report published periodically, but no more frequently than monthly, by a trade association that receives renter data and publishes it in an aggregated and anonymous manner; or (2) a product used for the purpose of establishing rentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 or income limits in accordance with the affordable housing program guidelines of a local government, the State, the federal government, or other political subdivision.

"Nonpublic competitor dataNonpublic competitor data"Nonpublic competitor data" means information that is not widely available or easily accessible to the public, including information about actual rent prices, occupancy rates, lease start and end dates, and similar data, regardless of whether the data are attributable to a specific competitor or anonymized, and that is derived from or otherwise provided by another person that competes in the same market as a person, or a related market.Section 10" means information that is not widely available or easily accessible to the public, including information about actual rentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 prices, occupancy rates, lease start and end dates, and similar data, regardless of whether the data are attributable to a specific competitor or anonymized, and that is derived from or otherwise provided by another person that competes in the same market as a person, or a related market.

"RentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10" means the total amount of rentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10, including concessions and fees, that a residential tenant is required to pay under a rental agreement.

Defines the three key terms used throughout the Act: algorithmic device, nonpublic competitor data, and rent. The algorithmic device definition is notable for its two carve-outs — periodic aggregated trade-association reports and affordable housing program compliance tools — which narrow the prohibition's scope. The nonpublic competitor data definition is deliberately broad, covering anonymized as well as attributed data derived from competitors in the same or related markets.

Section 15
Algorithmic device in setting rent amount prohibited
Deployer

(a) 1 In setting the amount of rentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 to be charged to a tenant for the occupancy of a residential premises, including determining any change in the amount of rentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 to be charged for the renewed occupancy of a residential premises, a landlord shall not employ, use, or rely upon, or cause another person to employ, use, or rely upon, an algorithmic deviceAlgorithmic device"Algorithmic device" means a device that uses one or more algorithms to perform calculations of data, including data concerning local or statewide rent amounts being charged to tenants by landlords, for the purpose of advising a landlord concerning the amount of rent that the landlord may consider charging a tenant. It includes a product that incorporates an algorithmic device but does not include: (1) any report published periodically, but no more frequently than monthly, by a trade association that receives renter data and publishes it in an aggregated and anonymous manner; or (2) a product used for the purpose of establishing rent or income limits in accordance with the affordable housing program guidelines of a local government, the State, the federal government, or other political subdivision.Section 10 that uses, incorporates, or was trained with nonpublic competitor dataNonpublic competitor data"Nonpublic competitor data" means information that is not widely available or easily accessible to the public, including information about actual rent prices, occupancy rates, lease start and end dates, and similar data, regardless of whether the data are attributable to a specific competitor or anonymized, and that is derived from or otherwise provided by another person that competes in the same market as a person, or a related market.Section 10.

(b) 1 A violation of this Act constitutes an unlawful practice within the meaning of the Consumer Fraud and Deceptive Business Practices Act.

This is the bill's core operative provision. It prohibits landlords from using — directly or through another person — any algorithmic device that uses, incorporates, or was trained with nonpublic competitor data when setting or adjusting residential rent. The prohibition covers initial rent-setting and renewal pricing alike. Subsection (b) designates any violation as an unlawful practice under the Illinois Consumer Fraud and Deceptive Business Practices Act, importing that statute's full enforcement apparatus including Attorney General authority and private remedies.

Compliance actions 1 item
1
Landlords must not use, rely upon, or cause another person to use any algorithmic deviceAlgorithmic device"Algorithmic device" means a device that uses one or more algorithms to perform calculations of data, including data concerning local or statewide rent amounts being charged to tenants by landlords, for the purpose of advising a landlord concerning the amount of rent that the landlord may consider charging a tenant. It includes a product that incorporates an algorithmic device but does not include: (1) any report published periodically, but no more frequently than monthly, by a trade association that receives renter data and publishes it in an aggregated and anonymous manner; or (2) a product used for the purpose of establishing rent or income limits in accordance with the affordable housing program guidelines of a local government, the State, the federal government, or other political subdivision.Section 10 that uses, incorporates, or was trained with nonpublic competitor dataNonpublic competitor data"Nonpublic competitor data" means information that is not widely available or easily accessible to the public, including information about actual rent prices, occupancy rates, lease start and end dates, and similar data, regardless of whether the data are attributable to a specific competitor or anonymized, and that is derived from or otherwise provided by another person that competes in the same market as a person, or a related market.Section 10 when setting or adjusting residential rentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 amounts.
CP-03
Section 20
Applicability

This Act applies to a landlord's calculation of the amount of rentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 that the landlord charges for the occupancy of a residential premises under any rental agreement that is executed on or after the effective date of this Act.

Limits the Act's temporal scope to rental agreements executed on or after the Act's effective date. Existing lease agreements are not affected retroactively, but renewals executed after the effective date are covered.

815 ILCS 505/2HHHH
Violations of the Prohibition of Algorithmics in Rent Act

Any person who violates the Prohibition of Algorithmics in RentRent"Rent" means the total amount of rent, including concessions and fees, that a residential tenant is required to pay under a rental agreement.Section 10 Act commits an unlawful practice within the meaning of this Act.

Amends the Illinois Consumer Fraud and Deceptive Business Practices Act to add a new Section 2HHHH, which mirrors the enforcement hook in Section 15(b) by designating any violation of the Prohibition of Algorithmics in Rent Act as an unlawful practice under the Consumer Fraud Act. This cross-reference ensures that violations carry the full range of Consumer Fraud Act remedies and enforcement authority.

Passage Likelihood

Low
Status Introduced
Chamber No passage
Committee No action
Majority party Yes
Bipartisan No
Prior session None

Legislative History

2025-01-16 Filed with the Clerk by Rep. Kevin John Olickal
2025-01-17 Chief Sponsor Changed to Rep. Lilian Jiménez
2025-01-17 Added Chief Co-Sponsor Rep. Kevin John Olickal
2025-01-28 First Reading
2025-01-28 Referred to Rules Committee
2025-02-18 Assigned to Housing Committee
2025-03-21 Rule 19(a) / Re-referred to Rules Committee
2026-03-12 Assigned to Housing Committee
2026-03-25 Added Chief Co-Sponsor Rep. Stephanie A. Kifowit
2026-03-27 Rule 19(a) / Re-referred to Rules Committee

Entry Last Reviewed

2026-05-20
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