Late fees are not universal. The amount you can charge, how you state it, and whether you can enforce it legally depends on where your customer is and what your contract says.
Charge too much and a debtor can argue the fee is unenforceable. Charge too little and the fee doesn’t actually change behavior. Fail to state it upfront and a court might not side with you even if the amount is legal.
This guide breaks down late-fee law by state, what works, and what doesn’t. It includes the legal ceiling in each state (the maximum you can charge) and the practical sweet spot (what actually moves payment without crossing into unenforceable territory).
The core late-fee rule
You can charge a late fee if:
- It’s written into your contract or invoice before the invoice is issued. A surprise fee tacked on after the fact is unenforceable in most states.
- The amount is “reasonable.” Most states define reasonable as a genuine pre-estimate of the cost to you of non-payment. 1.5% per month on a $10,000 invoice is reasonable. 50% per month is usury (and illegal).
- You have the right to charge it. Standard business terms with a repeat customer who has always accepted late fees work. A one-off customer to whom you never mentioned late fees cannot be charged retroactively.
Late fees are not interest. Interest (charged to a consumer for lending money) has different rules and is often capped lower than late fees. A fee you charge a business for the cost of chasing payment can be higher than interest to a consumer.
The business vs. consumer distinction
Many states cap late fees stricter for B2C (business-to-consumer) than B2B (business-to-business). A 1.5% monthly fee you can legally charge a contractor’s business might be illegal if that contractor owes you money in a personal capacity.
For this guide, we focus on B2B (business-to-business) invoices. If you’re chasing a customer who bought for personal use, check your state’s consumer-protection laws.
Late-fee types by state
States fall into a few buckets:
Type 1: Percentage-capped states. A maximum percentage per month or per annum. Examples: California (1.5% per month), New York (1% per month).
Type 2: Specific-amount states. A fixed dollar amount, not a percentage. Example: Delaware ($25 maximum per invoice).
Type 3: “Reasonable” states. No hard cap, but the fee must be a reasonable pre-estimate of your costs. Most common. You can argue for higher fees if you can show they offset your collection costs.
Type 4: Unrestricted (B2B only). No statutory cap if the contract clearly states the fee upfront. Mostly states with light-touch commercial law.
When late fees actually work
The sweet spot for late fees that (a) stay enforceable, (b) actually change debtor behavior, and (c) don’t make you look predatory is 1% to 1.5% per month (12% to 18% annualized) on overdue amounts.
Below 0.5%, debtors ignore it. Above 2%, courts start questioning enforceability and customers feel gouged.
1.5% on a $5,000 invoice = $75 per month. After 60 days, the customer owes $150 in fees. That’s enough to move payment conversations.
State-by-state late-fee rules
Alabama
Max late fee: 1.5% per month or 18% per annum if stated in contract. No cap if contract is silent and parties are merchants.
Practical approach: State “1.5% per month or 18% per annum, whichever is greater” in your standard terms. Get written acceptance from repeat customers.
Risk: Fees charged retroactively (after the invoice date) may be unenforceable. Always state upfront.
Alaska
Max late fee: 1% per month (12% per annum) for non-consumer transactions. No statutory cap for B2B if clearly stated.
Practical approach: Use 1% per month. Document the fee in your contract or on the invoice at the time of billing.
Risk: If the fee appears punitive (above 2% per month) rather than compensatory, a court may not enforce it.
Arizona
Max late fee: 1.5% per month (18% per annum) if stated in the contract. No cap for B2B with clear written notice.
Practical approach: 1.5% is safe and enforceable. State it on the invoice template and in your payment-terms email.
Risk: Fees must reasonably relate to the cost of collection. If you claim a $5,000 fee on a $10,000 invoice, a court will question it.
Arkansas
Max late fee: 1% per month (12% per annum) on past-due amounts for B2B.
Practical approach: Use 1% per month. Include it in written payment terms.
Risk: Arkans law requires the fee to be “agreed upon in writing.” Verbal terms don’t count. Email invoice with terms works; unsigned purchase order does not.
California
Max late fee: 1.5% per month (18% per annum) for non-consumer accounts. Consumer caps are stricter.
Practical approach: State “Late fee: 1.5% per month on past-due amounts over 30 days” on the invoice.
Risk: California courts scrutinize whether the fee is a “reasonable pre-estimate of harm.” If you can’t justify it (show that collection costs you roughly that much), enforceability is questionable.
Colorado
Max late fee: 1.5% per month if stated in the contract. No statutory cap for commercial parties with written agreement.
Practical approach: Use 1% to 1.5% and document in your standard payment terms.
Risk: The fee must be disclosed before the transaction. A fee hidden in the small print may not be enforceable if the customer did not clearly assent.
Connecticut
Max late fee: 1.5% per month (18% per annum) if stated upfront in a written contract.
Practical approach: Include the late-fee clause in your invoice or contract terms, signed by the customer (email acknowledgment counts).
Risk: Connecticut is strict on notice. If the customer’s first invoice didn’t mention the fee, adding it to the second may not be enforceable.
Delaware
Max late fee: Limited. No percentage-based cap for B2B, but courts require reasonableness. A fixed fee of $25 to $100 per invoice is typical.
Practical approach: Use a fixed late fee ($25-$50 per invoice after 30 days) rather than a percentage. Include it in writing at the time of the invoice.
Risk: Delaware courts weigh late fees against the size of the invoice. A $50 fee on a $500 invoice is reasonable; a $50 fee on a $100 invoice is not.
Florida
Max late fee: 1.5% per month (18% per annum) if stated in the contract. Consumer rules are stricter.
Practical approach: 1.5% per month for B2B. Document it at invoice time.
Risk: If the fee looks excessive relative to the debt size, courts may refuse to enforce it. A $1,500 fee on a $5,000 invoice will be challenged.
Georgia
Max late fee: 1.5% per month (18% per annum) for commercial accounts if agreed in writing.
Practical approach: State the fee in your standard terms. Repeat customers should sign a master agreement acknowledging the terms; one-off customers should see the fee clearly on the invoice.
Risk: Georgia law requires clear notice and assent. Burying the fee in dense small print may not be enforceable.
Hawaii
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: Use 1.5% per month for commercial accounts.
Risk: The fee must be a pre-estimate of costs, not a penalty. If you charge 1.5% on every invoice regardless of size or collection effort, that’s enforceable.
Idaho
Max late fee: 1% per month (12% per annum) for non-consumer transactions if clearly stated.
Practical approach: Use 1% per month. Include it in your payment terms.
Risk: Idah courts look at whether the fee is proportional to the actual cost and inconvenience of collection.
Illinois
Max late fee: 1.5% per month (18% per annum) if stated in the contract. No statutory cap for B2B.
Practical approach: 1.5% is standard. Include it in your invoice footer or payment-terms document.
Risk: If you cannot show the fee relates to your actual collection costs, a court may reduce it or strike it as a penalty.
Indiana
Max late fee: 1.5% per month (18% per annum) if stated in writing before the invoice is issued.
Practical approach: Use 1.5% per month. Document in your standard contract terms.
Risk: The fee must be disclosed before the customer agrees to buy. A fee added retroactively is unenforceable.
Iowa
Max late fee: 1% per month (12% per annum) for non-consumer accounts.
Practical approach: Use 1% per month. Include in written payment terms.
Risk: Iowa’s law requires the fee to be a genuine pre-estimate of loss, not a penalty for late payment.
Kansas
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard. Include it at invoice time.
Risk: The fee must appear reasonable relative to the invoice size. A 1.5% fee on a $50,000 invoice ($750 per month) is defensible; on a $50 invoice, it looks punitive.
Kentucky
Max late fee: 1.5% per month (18% per annum) if clearly stated in the contract.
Practical approach: Use 1.5% per month for B2B accounts.
Risk: Kentucky courts enforce late fees but require clear contractual language. Ambiguous terms are interpreted against the fee-charger.
Louisiana
Max late fee: 1.5% per month (18% per annum) if stated in the contract or invoice.
Practical approach: 1.5% per month is enforceable and standard.
Risk: Louisiana has a civil-law tradition and can be stricter on contract interpretation. Ensure the fee is unambiguous.
Maine
Max late fee: 1.5% per month (18% per annum) if stated in writing before the sale.
Practical approach: 1.5% per month. Document in your standard terms.
Risk: Maine requires clear notice. If the customer’s first communication doesn’t mention the fee, subsequent invoices might not bind them.
Maryland
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: Use 1.5% per month for commercial accounts.
Risk: Maryland courts scrutinize late-fee clauses that appear punitive rather than compensatory.
Massachusetts
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard and enforceable.
Risk: Massachusetts requires clear, conspicuous notice. Bury the fee in tiny print and a court may ignore it.
Michigan
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: Use 1.5% per month. Include on the invoice or in payment terms.
Risk: Michigan courts enforce late fees but require them to be a reasonable estimate of harm, not a penalty.
Minnesota
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard and enforceable.
Risk: The fee must be disclosed at or before the time of sale.
Mississippi
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: Use 1.5% per month.
Risk: Mississippi requires clear written notice before the invoice is issued.
Missouri
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard.
Risk: Missouri law requires the fee to be a genuine pre-estimate of the cost of non-payment.
Montana
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: Use 1.5% per month for B2B.
Risk: The fee must be stated before the transaction is completed.
Nebraska
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is enforceable.
Risk: The fee must appear reasonable relative to the invoice amount.
Nevada
Max late fee: 1.5% per month (18% per annum) if stated in the contract. No cap for B2B with written agreement.
Practical approach: Use 1.5% per month or negotiate a higher percentage with repeat customers.
Risk: The fee must be stated in writing before the sale.
New Hampshire
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard.
Risk: New Hampshire requires clear notice and assent. Ambiguous language will be interpreted against the fee-charger.
New Jersey
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: Use 1.5% per month.
Risk: The fee must be a reasonable pre-estimate of loss.
New Mexico
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is enforceable.
Risk: Clear written notice required before the sale.
New York
Max late fee: 1% per month (12% per annum) for non-consumer accounts if stated in the contract.
Practical approach: Use 1% per month. New York is slightly stricter than other states, so avoid pushing above 1%.
Risk: New York courts are business-friendly but still scrutinize fees that appear punitive.
North Carolina
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard and enforceable.
Risk: The fee must be clearly disclosed before the invoice is issued.
North Dakota
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month for B2B.
Risk: Written notice required before the sale.
Ohio
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard.
Risk: The fee must be a genuine pre-estimate of your costs.
Oklahoma
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is enforceable for B2B.
Risk: Written notice at or before the time of sale.
Oregon
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard.
Risk: Oregon requires clear, conspicuous notice.
Pennsylvania
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is enforceable.
Risk: The fee must be disclosed before the sale.
Rhode Island
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard.
Risk: Clear written notice required.
South Carolina
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: Use 1.5% per month for B2B.
Risk: The fee must be a pre-estimate of harm, not a penalty.
South Dakota
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is enforceable.
Risk: Written notice before the sale.
Tennessee
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard and enforceable.
Risk: The fee must be clearly disclosed.
Texas
Max late fee: 1.5% per month (18% per annum) for non-consumer transactions if stated in the contract.
Practical approach: 1.5% per month is standard and enforceable in Texas.
Risk: The fee must appear reasonable relative to the invoice amount.
Utah
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is enforceable.
Risk: Written notice required before the sale.
Vermont
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard.
Risk: Clear, conspicuous notice required.
Virginia
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month for B2B is standard and enforceable.
Risk: The fee must be disclosed before the invoice is issued.
Washington
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is enforceable.
Risk: Clear written notice at or before the sale.
West Virginia
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard and enforceable.
Risk: The fee must be a pre-estimate of your collection costs.
Wisconsin
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month is standard and enforceable.
Risk: Clear notice required at the time of the invoice.
Wyoming
Max late fee: 1.5% per month (18% per annum) if stated in the contract.
Practical approach: 1.5% per month for B2B is enforceable.
Risk: Written notice required before the sale.
Practical rules for all states
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State the late fee in writing at or before the invoice is issued. Email counts. A contract or invoice template counts. Verbal agreement does not.
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Use 1% to 1.5% per month as your standard. It’s enforceable in every state, changes debtor behavior, and doesn’t look predatory.
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Make the fee reasonable relative to the invoice amount. A $100 fee on a $10,000 invoice is reasonable; a $100 fee on a $200 invoice is not.
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For repeat customers, get written acknowledgment. Have them sign a service agreement or master invoice-terms document that includes the late-fee clause.
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For one-off customers, ensure the fee is clearly visible on the invoice. Not in 8-point font at the bottom. Make it part of the standard payment-terms section.
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If you offer a discount for early payment, state both together. “1.5% late fee after 30 days, or 2% discount if paid within 10 days.” This makes the fee appear reasonable and not punitive.
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Track which customers have been notified of the fee. If you charge a late fee to a customer who has never been told about it, you’ll lose in court.
When to use a late fee
Late fees work when:
- The invoice is over $500 (small invoices don’t merit the overhead of collecting late fees).
- The customer is a business, not a consumer.
- You have a written contract or repeated business relationship.
- Your industry standard allows it (construction, professional services, and B2B SaaS all normalize 1-2% late fees).
- The customer is worth keeping (a late fee on a one-time customer can poison future relationships).
Late fees don’t work when:
- The amount is so small ($50 invoice, $5 late fee) that the effort to enforce it exceeds the recovery.
- The customer is a consumer or a household; state consumer laws cap late fees much lower.
- You have no written agreement stating the fee upfront.
- The customer relationship is at risk; a late fee on a long-standing client can backfire.
Next steps
If you’re using late fees to improve cash flow, make sure they’re clearly stated in your payment terms and enforced consistently. A late fee that’s on your invoice but never actually charged teaches customers to ignore it.
For newer customers, ti3 can help you escalate unpaid invoices with structured reminders and settlement offers. After 30-60 days without payment, a combination of consistent contact, a settlement option, and a Final Demand Notice is often more effective than a late fee alone.
If you want a structured approach to chasing unpaid invoices, sign up for a free analysis.
Related guides
See the full AR recovery guide for small business: Small business AR recovery: Complete guide.
Learn when unpaid invoices become uncollectible: Statute of limitations on unpaid invoices by state.
Learn how to write a demand letter without a lawyer: Demand letter without lawyer.