California gives landlords no statutory grace period and no percentage safe harbor, which makes the fee the weakest part of most notices. Under Civil Code §1671(d) the burden sits entirely on the landlord to justify the amount, and Orozco voided a flat charge worth well over half a month's rent. Practitioners keep residential fees at or below five percent and keep a file note explaining the administrative cost behind the number. Timing downstream matters too: a notice under Code of Civil Procedure §1161(2) must state the exact rent due, and since AB 2347 a tenant has ten court days to answer an unlawful detainer rather than five.
Texas is the most predictable state in the country here. Property Code §92.019 bars any fee until rent has stayed unpaid two full days past the due date, requires it to be written into the lease, and permits an initial charge plus a daily charge so long as the combined total stays inside the safe harbor. A landlord who overcharges owes the tenant one hundred dollars, three times the fee wrongly collected, and reasonable attorney's fees. The late rent notice therefore doubles as a compliance check before you reach the §24.005 notice to vacate.
Florida caps nothing, which is less generous than it sounds, because a fee a county judge reads as punitive falls as an unenforceable penalty. The trap sits in Florida Statutes §83.56(3), whose three day notice follows a statutory form, excludes Saturdays, Sundays and legal holidays from the count, and demands rent only. Notices bundling a late charge into the amount demanded are voided regularly.
New York runs the strictest regime and the only one that makes this document mandatory. Real Property Law §235-e(d) requires certified mail once rent is five days late, §238-a(2) caps the fee, and RPAPL §711(2) requires a fourteen day written demand before a nonpayment proceeding. Late fees cannot go into that demand and cannot alone support an eviction. Rent stabilized units carry further restrictions, and periodic tenancies have their own tiered termination timelines, covered in our month to month rental agreement template.