RentLateFee.com focuses on a narrow but frequently contested problem: how much a landlord may legally charge when rent is paid late. Instead of a flat percentage, the calculator loads the rules for the selected state — statutory caps, required grace periods, and reasonableness standards — and applies them to the actual payment timeline, including whether the late period falls inside a grace window.
Alongside the calculator, the site publishes a free state-by-state reference covering all 50 states plus DC, and it adds prorated rent and Section 8 calculators for related questions. Downloads include a PDF statement with legal source citations, which the site positions as documentation for landlords who may need to defend a fee in a deposit dispute or small claims situation.
A Premium tier, priced at $5 per month, adds AI features: a GPT-powered legal Q&A assistant, automated lease review that flags problematic clauses, smart document summarization, AI clause improvement suggestions, and a library of lease templates for more than 50 states. The site is operated by LIFEMEDZ LLC and states prominently that it offers general information rather than legal advice.
