A fee not written into the rental agreement is generally unenforceable in any state.
Which states have a specific late-fee statute?
Five states in the research have enacted explicit safe-harbor rules.
**Florida.** Fla. Stat. § 83.808 sets the safe harbor at the greater of $20 or 20 percent of monthly rent. A fee at or below that threshold is deemed reasonable and is not treated as a penalty. The fee and its trigger date must appear in the rental agreement.
**Michigan.** MCL § 570.523, the Michigan Self-Service Storage Facility Act (Act 148 of 1985), uses the same formula: the greater of $20 or 20 percent of monthly rent. Michigan goes one step further and places the burden on the owner to justify the reasonableness of any fee above that safe-harbor amount.
**Alabama.** Alabama Code § 8-15-44(e) mirrors the $20-or-20%-of-monthly-rent formula and states explicitly that the amount is not a penalty.
**Massachusetts.** Mass. Gen. Laws ch. 105A, § 5 uses the same $20-or-20%-of-monthly-rent calculation. Massachusetts also requires the rental agreement to state both the date rent is due and the specific date on which the late fee accrues. If your agreement says rent is due on the first but does not name the date the fee kicks in, you may have a problem.
**Arizona.** Arizona Revised Statutes § 33-1703(E) sets a lower floor. A reasonable late fee may be computed as the greater of $10 per month or 20 percent of monthly rent. The dollar floor is half what Florida, Michigan, Alabama, and Massachusetts allow.
**New Jersey.** New Jersey passed a late-fee law allowing the greater of $20 or 18 percent of monthly rent. That 18 percent ceiling is lower than the 20 percent used in the other states above.
What if my state has no specific storage late-fee statute?
Texas is a clear example. Texas Property Code Chapter 59 governs self-storage liens and lien enforcement statewide but sets no statutory dollar cap on late fees. Texas courts have dismissed class-action late-fee suits on the basis that a fixed contractual fee constitutes agreed liquidated damages. That means your rental agreement carries most of the legal weight. If a tenant signs an agreement that says the late fee is a specific dollar amount, Texas courts have generally treated that as a binding contract term rather than an illegal penalty.
If your state is not on this list, the variation is determined by three things: whether your state has enacted a specific self-storage late-fee statute, whether it relies instead on a general reasonableness or liquidated-damages standard enforced through contract law, and whether any local ordinances add limits on top of state law. That last point matters in states with strong home-rule cities. A local attorney who handles self-storage or commercial landlord work in your county is the right person to check.
Does the late fee have to appear in the rental agreement?
Yes, in every state that has addressed the issue. A fee not stated in the written rental agreement is generally unenforceable. That means the amount, and in states like Massachusetts the trigger date, need to be spelled out clearly before the tenant signs. If you updated your fee schedule after a tenant moved in and did not get a signed addendum, that tenant's agreement still controls.
This also connects to your lien process. Self-storage lien laws specify the minimum days of delinquency before a lien attaches, the required notice format and delivery method, and the permissible auction procedures. Those timelines interact directly with when your late fee accrues. If your agreement says the fee hits on day five but your lien notice goes out on day ten, both documents need to be consistent or you create an opening for a tenant to challenge the lien.
What happens if I charge more than the safe-harbor amount?
In Michigan, the statute explicitly puts the burden on you to justify a higher fee as reasonable. In Florida and Alabama, the safe harbor means a fee at or below the formula is protected; a fee above it is not automatically illegal, but you lose the statutory protection and a tenant or court could challenge it as a penalty. The practical risk is that a challenged fee gets thrown out entirely, which means you collected nothing and may owe the tenant a refund.
What should you do next?
- Pull your state's self-storage statute and look for the late-fee section specifically. The states above are named with their statute numbers. If your state is not listed, search your state legislature's website for "self-service storage facility" or "self-storage lien."
- Compare your current rental agreement to what the statute allows. Check the fee amount, the trigger date, and whether both are written in plain language a tenant can read at move-in.
- If you are in a state with no specific storage statute, or if you want to charge above a safe-harbor amount, talk to a local attorney before you change your agreement. This is not a situation where a generic lease template from another state protects you.
- Review your lien notice timeline against your late-fee trigger date. The two documents need to be consistent. If your gate code gets disabled on day ten and your lien notice goes out on day fifteen, make sure your agreement describes that sequence accurately.
- When you update your fee schedule, get a signed addendum from existing tenants. A new rate in your system does not override what a tenant already signed.
Where does Propty fit?
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