Late Fee Calculator
Check your state’s late-fee cap, the allowable fee, and the total owed — in seconds.
How the late fee calculator works
Late fees are one of the easiest charges to get wrong. Some states cap them as a percentage of monthly rent, others set a flat dollar maximum, a few impose a grace period before any fee can be charged — and many states set no statutory cap at all, leaving the lease clause in charge. Enter your state, the monthly rent, how many days late the payment is, and the late-fee amount written in the lease. The calculator looks up your state’s cap and grace period, then shows the maximum fee you can charge, the total amount owed, and the rule behind the numbers.
The most valuable answer this tool gives is a warning: when the late fee in the lease exceeds what the state allows, the excess may be unenforceable — and charging it anyway can backfire in a dispute or an eviction case. If your clause is over the cap, the calculator caps the allowable fee at the legal maximum and flags the difference clearly. Where a state sets no cap, the tool says so honestly instead of inventing one, and reminds you that courts can still reject fees they view as an unreasonable penalty.
What do landlords typically charge for late fees?
Most landlords use one of two structures: a flat dollar amount (for example, $50 or $75) or a percentage of monthly rent (commonly 5%). In our researched 50-state plus D.C. survey, 34 of 51 jurisdictions set no statutory late-fee cap at all — there, the lease clause controls, though courts can still reject fees they view as an unreasonable penalty. Where states do cap fees, percentage caps run from 4% to 10% of monthly rent and flat caps run from $75 to $100.
On timing: 38 of 51 jurisdictions have no statutory grace period, meaning a fee may be charged as soon as rent is late if the lease allows it. Among the jurisdictions that do mandate a grace period, 5 days is the most common (6 of them). Always check your lease first, then your state’s rule in the calculator above — and remember that local ordinances can add restrictions on top of state law.
Calculate the allowable late fee
Result
Frequently asked questions
Can I charge whatever late fee my lease says?
Only up to your state’s cap, where one exists. Several states cap late fees as a percentage of rent or a flat dollar amount, and charging more can make the excess unenforceable. The calculator warns you when a lease clause exceeds the cap.
What is a grace period?
A grace period is a number of days after the due date during which no late fee may be charged. If the rent is paid within the grace period, the calculator shows no fee. Once the grace period passes, the fee applies per the lease and the state cap.
My state has no statutory cap. Does that mean any fee is fine?
Not exactly. With no statutory cap, your lease clause controls — but courts in many states can still strike down fees they consider an unreasonable penalty rather than a genuine estimate of your costs. Keep fees proportionate and documented.
Does the calculator include the unpaid rent itself?
Yes. "Total owed" is the monthly rent plus the allowable late fee, so you see the full amount the tenant should pay for the period.
Is this legal advice?
No. Caps and grace periods come from statewide research data and can change; local ordinances may add rules. Verify before charging a fee, and consult a local attorney with questions.