Resolving an
invoice dispute

A disputed invoice is different from a late one. The customer is not forgetting to pay; they are saying they should not pay, or not all of it. Chasing harder rarely helps. What works is narrowing the dispute to specifics, getting the uncontested money in, and settling the rest on the evidence.

Step 1: find out exactly what is disputed

Ask the customer, in writing, which lines they dispute and why. "We are not happy with the work" is not something you can resolve; "the second coat of paint in the hallway was not applied" is. Many disputes shrink to a single item once someone names it.

Common causes are a price different from the quote, work outside the agreed scope, a delivery shortfall, quality complaints, or a missing purchase order reference the customer's system needs.

Step 2: get the undisputed part paid

If one line out of five is disputed, the other four are still owed. Ask the customer to pay them now. To make that easy, you can issue a credit note for the disputed line and, if needed, a separate invoice for it once agreed. The guide on how to correct an invoice covers the mechanics.

Step 3: check your evidence

Go back to what was agreed: the quote, the order, emails confirming extras, delivery notes, timesheets and photos of the finished work. If the evidence supports the customer, accept it quickly and correct the invoice. If it supports you, send the relevant documents with a short explanation.

If the dispute is about quality, offer to put it right before offering money off. A return visit to finish a snag often costs you less than a discount and leaves the customer happier.

Step 4: settle it in writing

Most disputes end in agreement: the customer pays in full once they see the evidence, or you agree a reduction. Put the outcome in an email both sides confirm, then issue any credit note and chase the agreed balance on a fixed date. Keep the whole exchange with your records.

If you cannot agree

If talking fails, there are options before court. Mediation, where an independent person helps both sides reach agreement, is often quicker and cheaper, and it is built into the small claims process. If you are a small business in dispute with a larger one over payment, the Small Business Commissioner can look at complaints.

As a last resort, send a letter before action and make a court claim. The guide on small claims for an unpaid invoice explains the steps and fees.

Interest while a dispute runs

Statutory interest applies to money that is owed and late. If a genuine dispute is resolved in your favour, the sum was owed from the original due date, and you can claim interest from then; the late payment interest calculator works it out. In practice, claiming interest in the middle of a genuine dispute can harden positions, so many businesses keep it as part of the final settlement discussion.

Preventing disputes

Most disputes start before the invoice. Put the scope, price and payment terms in writing before work starts. Confirm extras in writing as they arise, with a price. Use purchase order numbers when the customer issues them. Record delivery and completion, with photos where it helps. And invoice promptly, while everyone still remembers the job the same way.

Disputes and your tax

Until a disputed amount is settled, it is still part of the invoice you issued. If you use the cash basis, it is income only when received. If you use accruals and later agree a reduction, the credit note reduces your income in the period you issue it.

The most common disputes and how to answer them

Upfront cost of each way to resolve a £4,800 disputed invoice

• Agreeing it directly£0
• Small claims mediation£0
• Issuing a court claim£205

A dispute response, step by step

1. Acknowledge quickly. Reply the same day to say you have received the query and will respond by a set date. Silence hardens positions.
2. Ask for specifics in writing. Which lines, what is wrong, what the customer thinks the right figure is.
3. Gather the evidence. Quote, order, delivery note, timesheets, photos, emails.
4. Respond with the evidence. Accept what is fair, explain what is not, and propose a figure.
5. Separate the undisputed amount. Ask for it to be paid now, crediting and reissuing if that helps the customer's system; see how to correct an invoice.
6. Confirm the outcome in writing. Then issue any credit note and chase the agreed balance on a fixed date.

Why most disputes should end before court

The chart above shows the upfront money; the real cost of a dispute is time. Every week a disputed invoice sits unresolved is a week the undisputed part may also sit unpaid, a week of emails and calls, and a week the relationship sours. That is why the steps here aim to split the undisputed amount off early and settle the rest on the evidence. A dispute resolved in a fortnight by sending one email with the right attachment is worth far more than a won court case six months later.

The best evidence is created before the dispute exists: a quote the customer accepted, emails confirming every change and its price, delivery notes or sign-off at the end of the job. If you only take one habit from this guide, make it confirming extras in writing, with a price, before you do them.

Disputes with large customers

Large customers often have formal dispute processes and long approval chains. Ask for the name of the person who can resolve the query, and a date. If the business is much larger than yours and payment is being held up unreasonably, the Small Business Commissioner can consider complaints from small businesses about payment issues with larger ones. Payment terms and late payment rights still apply while a query is open, for the amounts that are not genuinely disputed; see charging interest on late payments.

When a dispute becomes a claim

If you cannot agree, send a letter before action that sets out the debt, the evidence and the date by which you expect payment. If that fails, a court claim with mediation built in is the next step, explained in small claims for an unpaid invoice. Mediation settles many disputes without a hearing, because each side hears the other's evidence from a neutral person.

A worked example

A landscaper invoices £4,800 for a garden redesign. The customer, a small hotel, disputes £600, saying the new fence was not in the quote. The landscaper checks: the quote did not include the fence, but an email from the hotel's manager agreed it at £600 during the job. The landscaper replies with the email and asks for the undisputed £4,200 to be paid now. The hotel pays £4,200 that week, reviews the email, and pays the £600 a fortnight later. Without the email, the landscaper would have been negotiating from memory.

Common questions

Can a customer withhold the whole invoice because of one problem? They may try, but the amount that is not in dispute is still owed. Ask for it to be paid while you resolve the rest.

Should I stop working for a customer during a dispute? Only if your contract allows it; otherwise finish current work as agreed and decide about future work separately.

Do I have to accept a discount to settle? No. A discount is a commercial choice. Sometimes it is worth it to end a small dispute quickly; sometimes the evidence supports the full amount.

Keeping the dispute file

Keep everything about a dispute in one place: the original quote and invoice, each message in order, the evidence you sent, and the agreed outcome. If the customer comes back months later, or the matter reaches a court, that file is your case. It also belongs with your business records for as long as you keep them; see how long to keep invoices. And when the dispute ends, record in your own notes what caused it, so the next quote, contract or invoice closes that gap.

Handled calmly and on the evidence, most invoice disputes end with the customer paying and staying a customer. That outcome is worth protecting.