Late Fee Calculator
This calculator works out a rent late fee three ways: a flat fee, a percentage of the monthly rent, or a per-day charge. It shows the math so you can copy it into a notice or a message to the tenant.
Check your state and city law before charging a late fee. Many states cap late fees (as a dollar amount, a percentage of rent, or both), require a grace period before any fee, or require the fee to be written into the lease. This calculator is generic on purpose — it does the arithmetic for whatever fee structure you enter, and it does not know your local rules. A fee that violates a cap can be unenforceable, so look up your state's rule first.
Late fee: $50.00
The math
- Flat fee, charged once rent is late: $50.00
Before charging this, confirm it fits your state's late fee rules and matches what your lease says.
Don't see your state? See late fee laws by state — more are added as each statute is verified.
The three common fee structures
- Flat fee. One fixed charge once rent is late, for example $50. Simple to explain and the most common structure in small-landlord leases.
- Percentage of rent. A percentage of the monthly rent, for example 5% of $1,500 = $75. Where states cap late fees, the cap is often expressed this way.
- Per-day fee. A daily charge for each day rent stays unpaid, sometimes with a maximum total. This one runs into state caps fastest, so be extra careful with it.
Whichever structure you use, it needs to be in the lease. A late fee that appears for the first time in a late notice is hard to defend anywhere.
Not legal advice. This calculator does arithmetic only — it does not apply any state's cap, grace period, or other rule. Landlord-tenant law on late fees varies a lot by state and sometimes by city. Check your local law before charging a fee, and talk to a lawyer if a dispute is brewing.
Common questions
Is there a standard grace period before a late fee?
No single standard. Some states require a grace period by law (five days is a common figure where a rule exists), others leave it to the lease. Check your state's rule, then follow whatever your lease says — if the lease grants a longer grace period than the law requires, the lease controls.
How much can I legally charge?
It depends entirely on your state, and sometimes your city. Caps come in several forms: a percentage of monthly rent, a flat dollar limit, or a general 'reasonable' standard that courts interpret. We deliberately did not build state rules into this version, because a wrong or stale number here would be worse than none. Search your state's statute or ask a local attorney.
Can I charge a late fee if the lease doesn't mention one?
Generally that is a bad idea, and in many places it is simply not enforceable. The lease is the contract; a fee the tenant never agreed to is hard to collect. If your current lease is silent, add a late fee clause at renewal rather than springing one mid-term.
Should I actually charge the fee every time?
That is a judgment call, not a math question. Plenty of landlords waive a first late payment for a good tenant and say so in writing. What matters is being consistent between tenants — selectively enforcing fees against some tenants and not others can create a fair-housing problem.