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There is no single late-fee percentage that applies to every U.S. invoice. Whether you can charge a fee or interest—and how much—depends on the customer, transaction, contract, and governing law. Check those factors before adding a charge; a rate written into terms is not automatically lawful in every situation.
What determines whether you can charge an overdue invoice?
Start with the agreement and the law governing the transaction. Review the signed contract, any terms incorporated into it, the invoice due date, and the governing-law clause. Look for the agreed late charge or interest rate, when it starts, how it is calculated, and whether it recurs or compounds. If the agreement is silent, do not assume a particular default rate applies: state rules and transaction-specific laws differ. A secondary overview reviewed in July 2026 also cautions that state rules vary; use it to identify questions, then confirm the answer in current primary law: Dueflo’s state late-fee overview.
Before calculating anything, establish whether the customer bought for business or personal, family, or household use; whether the customer is a private party or a federal agency; and whether a special regime applies, such as lending, construction, public contracting, or a regulated industry. Those distinctions can change which rules apply.
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A late fee is typically a stated charge triggered by late payment; interest accrues over time on an unpaid amount. The contract and applicable law determine whether either charge is permitted, when it begins, how it is calculated, and whether repeat charges or compounding are allowed. Check each term separately rather than treating “late charge” as a blanket authorization for any amount.
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- Two-Part Carbonless Invoice Book: Each invoice book has 50 sets of invoices, each with a white/light yellow section, with the yellow section retained in the invoice book to maintain detailed records.
- Consecutively Numbered: Enlarged red 6-digit numbers in the upper right corner of each invoice receipt book help you quickly navigate through your orders.
- Wraparound Divider Flap: A thick folded cardboard divider is integrated into the back of each invoice book for use between each two-part sales order to prevent the written content from rubbing off on subsequent copies of the invoice, resulting in wasted invoices.
- 2 Packs/50 Sets (100 Sets Total): Each invoice book provides 50 sequentially numbered carbonless sets of 2 invoice books for long-term use.
- Customizable Space: Each invoice book for small business has space at the top to add a company seal or sticker.
For a proposed charge, verify the rate or fixed amount, start date, calculation period, compounding method, recurrence, and any applicable cap against current primary law for the governing jurisdiction. The available authorities do not establish a universally safe rate for private invoices.
What changes when the customer is a consumer?
Consumer credit for personal, family, or household use may be subject to rules that do not apply in the same way to an ordinary business invoice. The Federal Trade Commission explains that its Credit Practices Rule covers specified consumer-credit transactions and prohibits late fees barred by the rule. Check the rule’s coverage and restrictions before assessing a charge: FTC guidance on complying with the Credit Practices Rule.
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- PACKAGE INCLUDES - Our invoice book per pack has 50 sets sheets, Total of 100 sheets. red code printed on each page with consecutive numbers
- Material - Receipt book is excellent quality carbonless paper is used in their production, tears off easily along the perforation.
- A5 Size - Sales invoice book size of 5.5" x 8.5", and forms are 2 part carbonless white/yellow sets on a sturdy chipboard backing
- WIDE APPLICATION - Sales reciepts/invoice book for small business is ideal for restaurants, food trucks, vendors, service provider, photographers, caterers, florists, bakeries, cafes, boutiques and salons
Consumer-credit treatment also depends on how the account actually operates. The Consumer Financial Protection Bureau’s Regulation Z commentary explains that whether a late-payment charge is excluded from the finance charge can turn on account terms and creditor practices—for example, whether the creditor requires full payment or permits balances to roll over. That classification is not general permission to impose any late fee. See the CFPB’s Regulation Z § 1026.4 commentary.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsDo federal Prompt Payment Act rates apply to private invoices?
No. The Prompt Payment Act framework concerns federal agencies paying qualifying vendors; it is not a rate schedule for invoices sent to private customers. The U.S. Department of the Treasury says interest on covered late federal payments uses the rate in effect when the invoice becomes late and accrues from the day after the required payment date through the payment date, subject to the Act’s conditions. Congress enacted the Act in 1982. Read the Treasury Fiscal Service Prompt Payment Act guidance for its scope and timing.
Rank #3
- This value 3 pack of Adams Invoice Books give you 150 two part carbonless invoices with a perforated white customer receipt and yellow duplicates for your records; 3 50-invoice books per pack
- Unique horizontal invoice sheets capture the purchased by and shipped to addresses; a compact 5-9/16 x 8-7/16 page still leaves plenty of room for details on up to 12 items sold
- Wraparound back cover prevents write-through between sets; pull out the perforated white customer receipt and the yellow carbonless duplicates stay behind for your records
- Unique 6 digit invoice numbers help you thumb through orders quickly; blank space up top gives you room for a company stamp—an affordable custom touch
- In value packs with three 50-invoice books for your small business; buy ahead to keep on site or take on the road for pop-up shop sales
For a federal contract, the applicable clause and its prerequisites matter. FAR 52.232-25 addresses proper invoices, acceptance, disputes, and interest penalties; it excludes specified delays associated with disagreements or amounts withheld under contract terms. In the stated circumstances, its additional-penalty demand procedure has a 40-day deadline. Review the clause and the contract rather than applying it to a private customer: FAR 52.232-25, Prompt Payment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why must you check the exact state and transaction?
State statutes may govern only particular kinds of transactions, not every invoice issued in that state. For example, North Carolina G.S. 24-10.1 addresses late-payment charges for specified loan categories and includes a once-per-late-payment limit in covered circumstances. It is not a general authorization or limit for all North Carolina invoices. Check the statute’s scope and current text: North Carolina G.S. 24-10.1.
Quick Recap
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- 6-PACK/50 Sets (300 Total Sets): Six 5-7/16 x 8-7/16" bound Sales Order Books with two-part forms which produces two identical records of each sales transaction, one for the customer and one for your business
- CARBONLESS COPY: No carbon paper! Each 2-part set features a white top sheet for recording each transaction and a bottom canary yellow sheet that captures written text from top sheet.
- CONSECUTIVE NUMBERS: Effortlessly identify the chronological order of transactions in each book by the pre-printed number on each sales order set
- WRAPAROUND DIVIDER FLAP: A thick, folded paperboard divider is integrated into the back of each book to use between each 2-part sales order form.
- PERSONALIZE: Each sales order form sheet contains space at the top to add a company stamp or sticker
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- QUALITY INVOICES: Adams Order books provide a professional invoice or customer receipt; a great way to create and maintain a professional image for small businesses and service providers
- 50 TWO-PART CARBONLESS FORMS: Customers get the perforated white top copy; retain the canary and pink copies for your records
- WRAP-AROUND COVER: Fold the back cover between sets to keep invoices neat and legible
- ROOM FOR CUSTOMIZATION: A blank space at top leaves room for your company stamp; a big savings over custom-printed forms
- CONSECUTIVELY NUMBERED: Large 6-digit numbers in the upper right hand corner help you thumb through orders quickly
How to assess and document a late charge
- Read the governing documents. Locate the signed agreement, incorporated terms, due date, and governing-law clause. Identify the exact provision, if any, covering fees or interest.
- Classify the customer and transaction. Determine whether the purchase was for business or household use, whether the customer is a federal agency, and whether a special statute or contract regime applies.
- Verify the calculation. Confirm the permitted amount or rate, accrual start, calculation period, compounding, repeat charges, and any cap in current primary law for the relevant jurisdiction.
- Send an itemized notice. Identify the invoice, principal, due date, contractual basis for the charge, calculation period, and amount claimed.
- Keep supporting records. Preserve the agreement, invoice, delivery or acceptance records, notices, and payment history.
- Handle disputes under the applicable process. If the amount or performance is disputed, follow the contract’s dispute and withholding provisions; do not presume interest automatically runs. The federal FAR clause addresses disagreements within its own covered context.
- Use the agency process for federal debts. For a qualifying federal-agency payment, follow the applicable Prompt Payment clause and agency procedure rather than importing that framework into private billing.
What to check before adding a charge
- Which law governs the agreement, and does a transaction-specific law apply?
- Is the customer a business, a consumer, or a federal agency?
- Does the contract authorize a fee, interest, or both—and when do they begin?
- Is the charge fixed, recurring, or accruing over time, and is the calculation permitted?
- Is the invoice disputed, or does the agreement allow withholding?
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