How much can a landlord charge for a late fee?

It depends on the state. Many states cap late fees (commonly 5%–10% of monthly rent or a 'reasonable' amount); some require a written grace period before any fee. A widely used safe harbor is 5% of monthly rent after a 5-day grace period — but always check your state statute and your lease.

What is a grace period?

The number of days after the due date during which rent can be paid without a late fee. Several states mandate a minimum grace period by law; in others it's whatever the lease says.

Can I charge a daily late fee?

Some states allow per-day fees, often with a cap on the total; others effectively prohibit them by requiring fees to be a reasonable estimate of damages. If you use a daily fee, cap the total and confirm it's enforceable in your state.

Late Fee Calculator

Free · No signup required · Updated July 2026 · Built by a self-managing landlord · 13 units in Pennsylvania since 2020

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.

Monthly rent ($)

Days past the due date

Grace period (days)

Fee structure

Fee amount ($)

Cap on total fee ($, optional)

Check your state first. Many states cap late fees (5%–10% of rent is a common range), some mandate a minimum grace period, and a fee a court considers punitive can be struck down entirely. Put the exact fee structure in the lease — you generally can't charge what the lease doesn't authorize.

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.

Related tools

Late fee laws in all 51 US jurisdictions

Rent increase notice periods by state

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.