Late Fee Calculator

Late fees are the #1 source of "but I thought the fee was different" arguments. Enter your lease's late-fee terms below and get an itemized breakdown showing exactly how the fee was computed — the math the tenant can see and you can defend.

Lease late-fee structure

Flat fee % of monthly rent Flat fee + daily fee after X days

Monthly rent $

Grace period (days after due date)

Flat late fee $

Late fee % of rent

Daily late fee $ (after trigger day)

Daily fee starts after day

Maximum late fee cap $ (0 = no cap)

Many states cap late fees or require them to be "reasonable" — enter your lease's cap, or your state's cap if it has one.

Rent was due on (month/day)

Rent actually paid (or today)

Late fee kicks in only after the grace period ends — day 1 of "late" is grace + 1.

Tips: charge what the lease says — not more, not less, and the same way for every tenant (Fair Housing consistency matters). Many states limit late fees (e.g., a percentage-of-rent cap or a "reasonable estimate of damages" standard); a fee that looks punitive can be struck down in court. Pair this with the Late Rent Notice generator when rent is still outstanding. Tools are for planning and record-keeping, not legal advice.