What this calculator does
Check the numbers before checking the law
Late-fee disputes often combine two separate questions: whether the arithmetic matches the stated formula and whether that formula is allowed or enforceable for the tenancy. This tool handles only the first question.
Use the exact formula from your records
A lease or fee disclosure can use a fixed charge, a percentage of rent, a daily amount, a maximum cap or a combination. Enter only the components actually stated in your documents rather than choosing a generic national rule.
Documents worth comparing
- Signed lease and any late-fee addendum.
- Rent due date and stated grace period.
- Payment confirmation showing when the required amount was submitted or received.
- Resident ledger showing the late-fee posting and amount.
- Current property or company fee disclosure.
- Property-state or local rule when late fees are regulated.
If the amount does not match
- Confirm the rent amount used as the percentage base.
- Check the grace-period end date and number of late days.
- Look for a separate fixed or daily component.
- Check whether a maximum cap applies.
- Check whether a partial or returned payment changed the calculation.
- Use the Rental Ledger Audit if multiple charges, payments or credits are involved.
Arithmetic tool only. A calculated amount is not a legal conclusion. State/local law and the exact lease can limit, prohibit or condition late fees, grace periods and daily charges.