Late Fees on Invoices: When You Can Charge Them, How Much, and State Limits (2026)

A late fee is the simplest lever you have when customers pay after the due date, and it is also one of the easiest to get wrong. Charge one that was never agreed, or one a court sees as a penalty or as excessive interest, and you may collect nothing extra and weaken your position in a dispute. This guide is for US small businesses and freelancers who invoice other businesses or consumers. It explains when a late fee is enforceable, how flat fees differ from interest, how state interest and usury rules work in California, New York, Texas and Florida, what applies when your contract says nothing, and how to word the clause. Statutes were checked in October 2026.

Quick answer

You can usually charge a late fee or interest on an overdue invoice if the customer agreed to it before the sale, the amount is reasonable compared with your real cost of late payment, and the rate stays within your state's limits. Many businesses charge 1% to 1.5% a month (12% to 18% a year) or a small flat fee. If nothing was agreed, state law may still give you statutory interest after the due date.

• Put the fee in the quote or contract, then repeat it on every invoice

• 1.5% a month is 18% a year — above New York's 16% a year civil cap and Texas's 10% a year general maximum

• California: 10% a year interest after breach when the contract states no rate

• Texas: 6% a year on accounts from the 30th day after due if no rate was agreed

• Consumer contracts face stricter rules than business-to-business ones

When a late fee is enforceable

A late fee is a contract term. Like any other term, it binds the customer only if the customer agreed to it. The strongest evidence is a signed quote, a statement of work, a credit application or a master agreement that states the fee before you deliver anything. A line in an invoice footer that the customer sees only after the work is finished is much weaker, and for sales of goods between merchants a new interest clause on an invoice may be treated as a material change that never became part of the deal. The payment terms guide covers how terms become binding in more detail.

Agreement is necessary but not sufficient. Courts also check two things. First, whether the charge is a fair estimate of the cost of late payment or a penalty designed to frighten the customer into paying. Second, whether the charge counts as interest and, if so, whether it exceeds a legal ceiling. A fee can pass one test and fail the other.

Three practical conditions make a late fee much easier to enforce: it was disclosed in writing before the sale, it is proportionate to what late payment really costs you (borrowing to cover the gap, staff time spent chasing, and the risk of never being paid), and you apply it consistently. If you waive late fees for everyone, a court may conclude they were never part of the real bargain, so charge them or waive them case by case in writing.

A late fee you can enforce

0/7

• Agreed in a signed quote, contract or credit application before the sale
• States when it starts, e.g. the day after the due date or after a grace period
• States the rate or amount and how it is calculated
• Capped at the maximum rate allowed by law
• Proportionate to the overdue amount, not the whole account
• Repeated on every invoice and statement
• Applied consistently, with waivers documented

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Flat fees vs interest: how each works

There are two common ways to charge for late payment, and many businesses combine them.

A flat late fee is a one-time charge, such as $25 or $50, added when an invoice passes its due date. It is simple to explain and easy to apply in accounting software. Its weakness is proportion: $50 on a $10,000 invoice is trivial, but $50 on a $150 invoice is a third of the bill, and a charge that size starts to look like a penalty rather than an estimate of loss.

Interest is charged as a percentage of the overdue balance for each period it stays unpaid, typically 1% or 1.5% a month. Because it scales with the amount and the delay, it looks more like compensation, and it gives the customer a reason to pay sooner rather than later. Its weakness is that it is plainly interest, so it is more likely to be tested against a state's rate ceiling.

Flat late fee vs monthly interest

Point	Flat late fee	Monthly interest
Example	$35 once the invoice is past due	1.5% a month on the overdue balance
Scales with invoice size	No	Yes
Scales with delay	No (unless repeated)	Yes
Main legal risk	Penalty if large relative to the bill	Rate ceiling or usury rules
Best for	Small, frequent invoices	Larger B2B invoices
Annual equivalent	Varies with invoice size	1.5% a month = 18% a year (simple)

Example

Flat late fee

$35 once the invoice is past due

Monthly interest

1.5% a month on the overdue balance

Scales with invoice size

Flat late fee

No

Monthly interest

Yes

Scales with delay

Flat late fee

No (unless repeated)

Monthly interest

Yes

Main legal risk

Flat late fee

Penalty if large relative to the bill

Monthly interest

Rate ceiling or usury rules

Best for

Flat late fee

Small, frequent invoices

Monthly interest

Larger B2B invoices

Annual equivalent

Flat late fee

Varies with invoice size

Monthly interest

1.5% a month = 18% a year (simple)

A sensible combined clause for business customers might read: "Invoices are due net 30 from the invoice date. Balances unpaid after the due date bear interest at 1% per month (12% per year) or the highest rate permitted by law, whichever is less, until paid." The "whichever is less" wording is common in commercial contracts because it aims to keep the charge inside the legal limit, although it does not guarantee a court will rescue an otherwise excessive rate. Avoid compounding, avoid charging interest on interest, and do not apply a late charge to amounts that are not yet due.

The reasonableness test: when a late fee becomes a penalty

Most states follow the same basic rule: a contract may fix damages for breach in advance, but only if the amount is a reasonable estimate of the loss, not a punishment. California writes this into Civil Code section 1671, and it is a useful model because it separates business and consumer contracts.

For non-consumer contracts, section 1671(b) presumes a liquidated damages clause, which includes a late fee, is valid. The customer who wants to escape it must prove it was unreasonable in the circumstances when the contract was made. For consumer contracts, meaning purchases or rentals of goods or services mainly for personal, family or household use, and residential leases, section 1671(d) flips the rule. The clause is void unless the parties agreed an amount because actual damages would be impracticable or extremely difficult to determine.

A 2022 California appeals court decision shows where the line falls even in business deals. In Honchariw v. FJM Private Mortgage Fund, borrowers on a $5.6 million commercial loan missed one monthly payment. The lender charged a 10% late fee on the missed payment and a 9.99% default rate on the entire unpaid principal. The court held the default charge on the whole balance was an unlawful penalty because it bore no reasonable relationship to the lender's loss from a single late installment. The lesson for invoicing is direct: tie the charge to the overdue amount and the period it is late, not to the whole account or future invoices.

For consumer customers generally, keep fees modest and predictable, state them clearly before the sale, and expect closer scrutiny. Federal Truth in Lending rules can also become relevant if you routinely let consumers pay over time. Regulation Z excludes charges for actual, unanticipated late payment from the finance charge, but the CFPB's commentary warns that if an account nominally requires full monthly payment and the business lets consumers pay over time without collection efforts, the "late fee" may really be a finance charge. If you regularly sell to consumers on payment plans, take advice before adding fees.

State interest limits: California, New York, Texas and Florida

Usury laws cap the interest that can be charged on a loan or forbearance of money. Whether a late charge on an unpaid trade invoice is a "forbearance" is the question that decides whether a usury cap applies at all, and states answer it differently. Some courts treat a seller's agreed late charge on an overdue account as a bona fide charge for late payment rather than a loan. Others treat a creditor's agreement to wait in exchange for interest as a forbearance. The table summarizes the headline numbers; the sections below explain how they apply.

Interest rules in four large states

State	General cap or usury rate	If the contract states no rate	Notes
California	the greater of 10% a year or the federal discount rate plus 5% for non-exempt lenders on non-household loans	10% a year after breach (Civ. Code 3289)	Bona fide credit sales generally outside usury (time-price doctrine)
New York	16% a year civil; 25% a year criminal	Court may award statutory prejudgment interest	Corporations cannot raise civil usury as a defense
Texas	10% a year unless another law applies; optional ceilings 18% to 24% a year (up to 28% for some business-purpose credit)	6% a year from the 30th day after due	Usury penalties are severe; optional ceilings must be contracted for
Florida	18% a year simple interest on obligations up to $500,000	Statutory interest set by the state	Larger obligations are capped only by the criminal usury statute

California

General cap or usury rate

the greater of 10% a year or the federal discount rate plus 5% for non-exempt lenders on non-household loans

If the contract states no rate

10% a year after breach (Civ. Code 3289)

Notes

Bona fide credit sales generally outside usury (time-price doctrine)

New York

General cap or usury rate

16% a year civil; 25% a year criminal

If the contract states no rate

Court may award statutory prejudgment interest

Notes

Corporations cannot raise civil usury as a defense

Texas

General cap or usury rate

10% a year unless another law applies; optional ceilings 18% to 24% a year (up to 28% for some business-purpose credit)

If the contract states no rate

6% a year from the 30th day after due

Notes

Usury penalties are severe; optional ceilings must be contracted for

Florida

General cap or usury rate

18% a year simple interest on obligations up to $500,000

If the contract states no rate

Statutory interest set by the state

Notes

Larger obligations are capped only by the criminal usury statute

California

California's constitution caps interest on loans and forbearances by non-exempt lenders. Banks, licensed finance lenders and several other classes of lender are exempt, but an ordinary business extending credit to its customers is not. For loans that are not for personal, family or household purposes, the cap is the greater of 10% a year or the federal discount rate plus 5%, which recent commentary puts in the 10% to 12% range. Household-purpose loans are capped at 10%.

The important exception for sellers is the time-price doctrine. California courts, including the state supreme court in Southwest Concrete Products v. Gosh Construction Corp. (1990), have held that a late charge in a bona fide sale of goods or services is not interest on a loan or forbearance, so the usury cap does not apply to it. The charge must still be agreed and reasonable under section 1671. If your contract states no rate at all, Civil Code section 3289 gives you 10% a year a year on the amount owed from the date of breach, for contracts made after January 1, 1986.

New York

New York's general usury statute, General Obligations Law section 5-501, forbids charging more than the rate set in Banking Law section 14-a, which is 16% a year a year, on a loan or forbearance. Criminal usury starts above 25% a year. Two features matter to business sellers. First, General Obligations Law section 5-521 bars corporations from raising civil usury as a defense, although they can still rely on criminal usury. Second, loans of $250,000 or more are exempt from the civil cap and loans of $2.5 million or more from all usury caps.

A 1.5% monthly charge is 18% a year, above the civil rate. Whether that matters depends on whether a New York court treats your late charge as interest on a forbearance and on who your customer is. Many New York businesses use 1% a month (12%) to stay clear of the question entirely.

Texas

Texas sets a general maximum of 10% a year a year in Finance Code section 302.001, "except as otherwise provided by law." The most common "otherwise" is Chapter 303, which lets parties agree in writing to an optional rate ceiling. The weekly ceiling cannot be set below 18% or above 24% a year, with a higher limit of up to 28% for some business-purpose credit. A seller that wants to charge 1.5% a month on Texas accounts should therefore make sure its credit terms properly contract for an authorized ceiling, because Texas usury penalties can exceed the interest charged.

If you never agreed a rate with the customer, Finance Code section 302.002 lets you charge 6% a year a year on the principal, but only starting on the 30th day after the amount was due.

Florida

Florida Statutes section 687.02 treats as usurious any contract for interest on a loan, advance, line of credit or forbearance above the equivalent of 18% a year simple interest simple interest. For obligations above $500,000, the civil ceiling does not apply and only the criminal usury limits in section 687.071 do. A 1.5% monthly simple charge sits exactly at 18% a year, so Florida sellers who compound or add fees on top risk crossing the line.

Worked examples in dollars

The examples below use an $8,400 invoice for commercial printing, due net 30. The customer pays 60 days after the due date. Each calculation is simple interest on the overdue amount only.

With an agreed 1% monthly charge. The contract says 1% a month on overdue balances. Two months late: $8,400 × 1% × 2 = $168. At 1.5% a month the charge would be $252, an 18% annual rate. Check that against the cap in your state before you bill it.

California, no agreed rate. Section 3289 gives 10% a year from the breach: $8,400 × 10% × 60 ÷ 365 = $138.08. You can ask for it in a demand letter and claim it in court.

Texas, no agreed rate. Section 302.002 allows 6% a year, but only from the 30th day after the due date, so 30 of the 60 days count: $8,400 × 6% × 30 ÷ 365 = $41.42.

Flat fee comparison. A $35 late fee on the $8,400 invoice is 0.4% of the balance and plainly proportionate. The same $35 on a $120 invoice is 29% of the bill. If most of your invoices are small, a monthly percentage with a small minimum is easier to defend than a large flat fee.

$8,400 invoice paid 60 days late

$168

Agreed 1% a month

12% a year, simple

$252

Agreed 1.5% a month

18% a year — check your state cap

$138.08

California, no agreed rate

10% a year from breach

$41.42

Texas, no agreed rate

6% a year from day 30 after due

Laws that add interest for you

In some situations the law imposes interest on late payment whether or not your contract mentions it.

Federal government customers. Under the Prompt Payment Act, agencies that pay a proper invoice late generally owe interest automatically, at 4.75% a year for July to December 2026. You do not need a late-fee clause, but you do need a proper invoice.

Construction projects. Most states have prompt payment statutes for construction. In Texas, unpaid amounts owed under the private construction prompt pay law bear interest of 1.5% a month starting the day after payment was due, and an owner must pay a contractor within 35 days after a payment request. In California, an owner who wrongfully withholds an undisputed progress payment for more than 30 days after a written demand owes a penalty of 2% a month on the amount withheld, in place of ordinary interest.

Judgments. If you sue and win, the court will usually award interest on the amount owed up to judgment and then post-judgment interest at a rate set by state law, so an unpaid invoice does not lose value while you litigate.

How to word and apply a late fee

Use plain language, put the clause in the document the customer signs or accepts before work starts, and repeat it on every invoice. A workable clause has five parts: when payment is due, when the charge starts, the rate or amount, a cap at the legal maximum, and recovery of collection costs if your state allows contractual cost-shifting.

Adding a late fee the right way

1. 1

   Choose a rate you can defend

   For business customers, 1% a month is the safe default in most states. Check your state's ceiling before using 1.5%.

2. 2

   Put it in the contract or quote

   State when it starts, how it is calculated and that it never exceeds the maximum rate allowed by law.

3. 3

   Repeat it on the invoice

   Print the due date and a short version of the clause on every invoice.

   Create an invoice
4. 4

   Remind before charging

   Send a reminder before the due date and on it; charge the fee only after the due date or agreed grace period.

   Write a payment reminder
5. 5

   Bill it separately and transparently

   Show the late charge as a separate line or on a monthly statement, with the dates and rate used.

When you apply the fee, calculate it as simple interest from the day after the due date (or the end of any grace period) on the overdue amount only. Show it as a separate line on the next statement rather than silently rolling it into the invoice total. Say in your terms how partial payments are applied: most businesses apply them to the oldest invoice first, then to late charges, but whatever you choose should be written down.

From due date to late charge

Step 1

Due date passes

Step 2

Grace period

if agreed

Step 3

Reminder sent

Step 4

Late charge applied

simple interest on overdue amount

Step 5

Shown on statement

Decide in advance when you will waive a fee. Waiving the first one for a long-standing customer who paid three days late is good relationship management. Waiving every fee for every customer turns your clause into decoration.

Common mistakes

Adding a late fee to an overdue invoice when it was never agreed. You can ask, but the customer can refuse. Put the clause in your terms for future work.

Using 1.5% a month everywhere. At 18% a year it exceeds the civil usury rate in New York and Texas's general maximum, and it sits at Florida's ceiling. Check your state.

Charging the whole account for one late invoice. As Honchariw shows, charges that reach far beyond the overdue amount look like penalties.

Compounding. Monthly compounding pushes the effective rate above the stated one and can break a ceiling. Use simple interest.

Letting a collector add fees you never agreed. The FDCPA bars third-party collectors from collecting amounts not authorized by the agreement or permitted by law on consumer debts, and many state laws go further. The collections guide explains when to escalate.

Statutes and official sources

• N.Y. General Obligations Law § 5-501
• N.Y. Banking Law § 14-a (16% rate)
• Texas Finance Code § 302.002 (legal rate of interest)
• Florida Statutes § 687.02
• CFPB — Regulation Z § 1026.4 (finance charge)
• Treasury — Prompt Payment interest rate

What to do next

Review your quote and contract templates and add a clear late-charge clause at a rate that fits your state, then repeat it on your invoices with the invoice generator. Schedule reminders with the payment reminder generator so you rarely need the fee at all, and see how to collect unpaid invoices for the steps after reminders fail.

This is general information, not legal or tax advice — confirm on the official source or with a professional.

Frequently asked questions

Can I charge a late fee on an invoice?

Yes, if the customer agreed to it before the work or sale, usually in a signed quote, contract or accepted terms, and the amount is reasonable and within your state's limits. A late fee printed for the first time on an overdue invoice is hard to enforce, because the customer never agreed to it. Without an agreed fee you may still be able to claim statutory interest after a breach.

How much can I legally charge as a late fee?

There is no single national cap. The limit depends on your state, whether the customer is a business or a consumer, and whether a court treats the charge as interest or as liquidated damages. Many businesses use 1% to 1.5% a month or a modest flat fee. Check that the annual equivalent stays within your state's interest rules, and keep flat fees proportionate to the invoice.

Is 1.5% a month the same as 18% a year?

Yes, as simple interest: 1.5% × 12 = 18% a year. That matters because some state ceilings are lower. New York's civil usury rate is 16% a year, and Texas's general maximum is 10% a year unless another law, such as its optional rate ceilings, applies. Whether a usury cap reaches a late charge on a trade account depends on the state.

What happens if my contract doesn't mention a late fee?

You cannot add a contractual late fee afterwards, but state law may give you interest. California applies 10% a year after a breach of a contract that states no rate, and Texas allows 6% a year on accounts starting the 30th day after the due date. Courts can also award interest as part of a judgment.

Should I charge a flat late fee or interest?

A flat fee is simple and works for small invoices, but a large flat fee on a small balance risks being seen as a penalty. Monthly interest scales with the amount and the delay, so it looks more like compensation. Many businesses use both: a small one-time fee plus monthly interest on the overdue balance, both stated in the contract.

Can a debt collector add late fees?

A third-party debt collector collecting a consumer debt may not collect any amount, including fees or interest, unless the agreement creating the debt expressly authorizes it or the law permits it. That rule in the Fair Debt Collection Practices Act is one more reason to put late charges in the original contract.

Sources & verification

Figures on this page were checked against the sources below when it was last reviewed on 11 October 2026. Each rate and limit is stored once with its own official source and review date, and official update channels are monitored daily so changes are picked up. How we verify

1. 1.N.Y. General Obligations Law § 5-501 — Rate of interest; usury forbidden — New York State Senate · accessed 11 October 2026
2. 2.N.Y. Banking Law § 14-a — Rate of interest — New York State Senate · accessed 11 October 2026
3. 3.N.Y. Penal Law § 190.40 — Criminal usury in the second degree — New York State Senate · accessed 11 October 2026
4. 4.N.Y. General Obligations Law § 5-521 — Corporations prohibited from interposing defense of usury — New York State Senate · accessed 11 October 2026
5. 5.Texas Finance Code § 302.002 — Accrual of interest when no rate specified — Texas State Securities Board · accessed 11 October 2026
6. 6.Texas Finance Code § 302.001 and § 303.009 — Texas Public Law (statute text) · accessed 11 October 2026
7. 7.Florida Statutes § 687.02 — Usurious contracts defined — Florida Legislature · accessed 11 October 2026
8. 8.California Civil Code § 3289 and § 1671 — FindLaw (statute text) · accessed 11 October 2026
9. 9.Understanding Usury (California) — Primerus (law firm article, 2026) · accessed 11 October 2026
10. 10.Honchariw: The Enforceability of Late Fees in California — Dinsmore & Shohl · accessed 11 October 2026
11. 11.Regulation Z § 1026.4 — Finance charge — Consumer Financial Protection Bureau · accessed 11 October 2026
12. 12.Fair Debt Collection Practices Act (text) — Federal Trade Commission · accessed 11 October 2026
13. 13.Texas Property Code § 28.004 and California Civil Code § 8800 — Texas Public Law (statute text) · accessed 11 October 2026
14. 14.Prompt Payment — Bureau of the Fiscal Service, U.S. Treasury · accessed 11 October 2026