Common Invoice Disputes and Resolutions (Playbook)

To resolve an invoice dispute, find out exactly which lines the client questions and why, check those lines against your agreement and records, and then fix what's wrong with a corrected invoice or a credit. Ask for payment of the amount nobody disputes while you work out the rest. This guide covers disputes over scope, rates or quantities, tax, a payment the client says it already made, quality, and missing purchase order details.

Billed publishes this page. The US rules quoted below come from the IRS, the Consumer Financial Protection Bureau (CFPB) and the Federal Trade Commission (FTC), opened on October 29, 2026. This is general information, not legal or tax advice. It doesn't say that any contract term or remedy is enforceable; ask a lawyer where needed, and ask your accountant about the tax side.

A five-step process for any dispute

1. Ask which lines are in question, and why. Get the invoice number, the line items and the reason in writing. Keep the reply to the facts, for example: "Thanks for flagging this. Which lines are in question, and what's the concern with each?"
2. Split the invoice. Separate the disputed lines from the undisputed ones, and ask for payment of the undisputed amount now.
3. Check your records. Compare the disputed lines with the signed agreement or estimate, any change requests, emails approving the work, time records and delivery evidence.
4. Propose a fix in writing. If the client is right, issue a corrected invoice or a credit memo rather than editing the old invoice. If your records support the charge, send them and explain what each line covers.
5. Record the outcome. Note what was agreed, when, and by whom, and update your templates or agreement so the same dispute doesn't come back.

Dispute types and how to handle each

"This wasn't in scope"

The client doesn't recognize work on the invoice. Pull the agreement, the request that started the work and any approval. If the work really was outside the agreement, decide whether to credit it as goodwill or agree on a change request for it going forward. To prevent it, describe each line clearly and reference the agreement section or request it relates to. See how to handle scope creep.

"The rate or quantity doesn't match the quote"

Compare the invoice line rates and quantities with the signed quote. If you raised rates during the project, check whether the agreement required written notice and whether you gave it. If the invoice is wrong, reissue it with the correct figures from your invoice templates or the invoice generator.

"The tax is wrong"

Check the tax rate, the client's location and whether the client gave you an exemption certificate. Whether that sale is taxable depends on your state; your state's tax agency or your accountant can confirm it. If the tax was wrong, issue a corrected invoice rather than changing the old one.

"We already paid"

Ask for the payment date, amount, method and reference. Check your bank records for an unmatched payment, which may have arrived without an invoice number. Have clients include the invoice number with each payment they send, and see the payment terms guide for what to include on the invoice.

"The work isn't finished or isn't right"

Check the acceptance criteria in the agreement. If the work falls short, agree on what will be fixed and by when, and whether payment for those lines waits until then. If the criteria were met, say so with the evidence, while still dealing with any genuine problems.

"We can't pay without a PO"

Larger clients may reject invoices that don't quote a valid purchase order number. Ask the client to open or extend a PO, then reissue the invoice with the PO number on it. To prevent it, get the PO number before you start the work.

The client thinks your invoice is a scam

Business clients have reason to check invoices carefully. The FTC's guide Scams and Your Small Business (July 2023, US) warns that "Scammers create phony invoices that look like you ordered products or services for your business." It tells businesses to "Make sure procedures are clear for approving purchases and invoices and ask your staff to check all invoices closely." Make your invoices quick to check: use your registered business name, quote the client's PO or contact name, and describe the work.

The client disputes a card payment (US)

If an individual client paid by credit card, they can dispute the charge with their card company. The CFPB page How do I dispute a charge on my credit card bill? (last reviewed April 15, 2024) tells cardholders: "To protect your rights you must also send a written billing error notice to the card company within 60 calendar days after the charge appeared on your statement." For quality problems, the FTC page Using Credit Cards and Disputing Charges (May 2022) says: "But if you have a problem with the quality of the item, contact the seller first, before you contact the issuer." Keep your agreement, delivery evidence and messages, because you may need them to respond through your payment processor.

Worked example: a disputed revision line

The business, client and figures here are a sample, invented for this example.

A designer sends invoice INV-1042 for $4,800:

• Design: 24 hours × $150 = $3,600.
• Revisions: 8 hours × $150 = $1,200.
• Total: $3,600 + $1,200 = $4,800.

The client questions the revisions line. The agreement includes two rounds of revisions in the design fee, and the invoice bills rounds 3 and 4 at 4 hours each. The designer's emails show the client asked for round 3 in writing. Round 4 fixed details the client says should have been right the first time. After seeing the emails, the client accepts round 3, and the two agree to split round 4.

• The client pays the undisputed design line right away: $3,600.
• Round 3: 4 hours × $150 = $600, requested in writing, so it stays.
• Round 4: 4 hours × $150 = $600, split 50/50, so the credit is $600 × 50% = $300.
• Credit memo: $300. Revised amount due: $4,800 − $300 = $4,500, of which $3,600 is paid and $4,500 − $3,600 = $900 is still owed.

Writing off an unpaid invoice (US)

If a client doesn't pay at all, the tax treatment depends on your accounting method. IRS Topic no. 453, Bad debt deduction (last reviewed or updated September 24, 2026) says: "If you're a cash method taxpayer (most individuals are), you generally can't take a bad debt deduction for unpaid salaries, wages, rents, fees, interests, dividends, and similar items of taxable income." It also says: "You may deduct business bad debts, in full or in part, only if the amount you were owed is included in your gross income in the current or prior year." Ask your accountant how this applies to you.

When to bring in a lawyer

If the amount is large, the agreement is unclear, the client threatens legal action, or you're thinking about a collection agency or court, ask a lawyer before you act. Rules on late fees, interest on overdue invoices and collections vary by place; see how to add late fees to invoices and check local rules.

Where Billed fits

Billed's invoice software page lists these features:

• "Invoice Chat Talk to your client about an invoice in one place, without leaving your dashboard."
• "Invoice Attachments Add files to your invoices and estimates."
• "Void Invoices Made a mistake while creating an invoice? Void it in Billed for better accounting."
• "Refund Your Customers Refund your customers from within Billed and keep track of refunds."
• "Billed keeps the complete history of an invoice and its payments from the moment it is created."

The same page says "Invoice reports show which invoices are paid, partially paid or past due, and you can see who owes you money and send them a payment reminder." For payments by card, PayPal, check or cash, see accept payments. For clients you bill on a schedule, see recurring invoices. Late payments affect your cash flow, and the guide to following up on unpaid invoices covers what to send when.

When this guide isn't for you

This guide is for freelancers and small businesses handling their own invoicing in the US. A large finance team on an ERP system, billing across several countries, or a dispute already in legal proceedings is outside this guide; get specialist help for those.

Related Articles

• How to Follow Up on Unpaid Invoices
• Invoice Payment Terms Explained
• What Is a Credit Memo?
• How to Handle Partial Payments

Frequently Asked Questions

What should I do first when a client disputes an invoice?

Ask which lines are in question and why, in writing. Then separate the disputed lines from the undisputed ones and ask for payment of the undisputed amount while you check your records.

Should I change the original invoice or issue a credit?

Issue a corrected invoice or a credit memo rather than editing an invoice you've already sent, so the record shows what was billed, what changed and why.

Can I charge interest or late fees on a disputed amount?

Your agreement and the law in your area and your client's decide that. This page doesn't say any late fee or interest term is enforceable. Check local rules, and ask a lawyer where needed.

How long does a client have to dispute a credit card payment in the US?

The CFPB (last reviewed April 15, 2024) says: "To protect your rights you must also send a written billing error notice to the card company within 60 calendar days after the charge appeared on your statement." That's the cardholder's process with their card company. Keep your agreement and delivery evidence in case you need to respond through your payment processor.

Can I deduct an invoice a client didn't pay?

In the US, the IRS says cash method taxpayers "generally can't take a bad debt deduction" for unpaid fees, and business bad debts are deductible only if the amount was included in gross income. Ask your accountant how this applies to you.