Tools
Free calculators for Chicago tenants and landlords. Everything runs in your browser. Nothing is saved or sent anywhere.
Late fee calculator
Chicago's Residential Landlord and Tenant Ordinance caps monthly late fees at $10 for the first $500 of rent, plus 5% of any amount above $500.
Per Chicago Municipal Code §5-12-140(h). The RTLO generally does not apply to owner-occupied buildings of six units or fewer. For subsidized housing, federal program rules (such as HUD/Section 8) may limit fees to the tenant's share of the rent; confirm with the program administrator.
Security deposit interest
Chicago landlords holding a security deposit for more than six months must pay interest at the rate set by the City Comptroller for the year the tenancy began, within 30 days after each 12-month rental period.
Simple interest per 12-month period at the selected year's rate, per RTLO §5-12-080/081/082. If the deposit spans multiple years, each year technically accrues at that year's published rate; since 2015 the rate has been unchanged at 0.01%.
Published rates by year
Prorated rent calculator
Moving in or out mid-month? This splits the month by actual calendar days.
Daily rate = monthly rent ÷ number of days in that calendar month. Move-in includes the move-in day; move-out includes the move-out day. Your lease may specify a different method; the lease controls.
ARO income qualification calculator
Estimate household income qualification for Chicago Affordable Requirements Ordinance rental units.
These tools are provided for convenience and general information only and are not legal advice. Ordinance rules change; verify current requirements with the City of Chicago or an attorney. City Experts, Inc. assumes no liability for decisions made based on these estimates.