Late Fee Calculator
Model exactly what a late tenant owes under your lease. Supports the three common fee structures — flat fee, percentage of rent, and per-day — with a grace period, and shows the math so you can drop it straight into a late notice.
LandlordPro applies late fees automatically
Set your grace period and fee rule once — LandlordPro applies it to every late payment, notifies the tenant, and keeps the audit trail you'll want if you ever end up in court. Free to start — up to 4 units.
Try LandlordPro free →The three late fee structures
Flat fee: a single fixed charge once the grace period passes (e.g., $50 on day 6). Simplest to enforce and explain.
Percentage of rent: a one-time fee equal to a percentage of the monthly rent (e.g., 5% of $1,200 = $60). Scales with rent and tracks the most common statutory caps.
Per-day fee: accrues daily after the grace period (e.g., $10/day). Strongest incentive to pay quickly, but the most likely to hit a statutory cap or be challenged as punitive — cap the total.
Frequently asked questions
When does a late fee actually start?
Rent due on the 1st with a 5-day grace period means rent is late — and the fee chargeable — starting day 6. The due date itself is day 0 in most lease language; this calculator treats the fee as chargeable once days late exceeds the grace period.
Can I waive a late fee once and charge it next time?
Yes, but do it in writing ("one-time courtesy waiver, lease terms remain in effect"). A pattern of silent waivers can create a course-of-dealing argument against enforcing the fee later.
Can I deduct an unpaid late fee from the security deposit?
In many states yes, if the lease authorizes it — but deposit deduction rules are state-specific and stricter than fee rules. Check your state's deposit statute.
This calculator is provided for convenience and general information only and is not legal advice. Late fee enforceability varies by state and lease — verify your state statute or consult an attorney.