How to handle invoice disputes

“I didn’t agree to this amount”

This is the most common dispute and usually the easiest to resolve. It happens when the quote, the scope, or the final price was not documented clearly enough. Sometimes the client genuinely misunderstood the pricing. Sometimes they are trying it on. Either way, the fix is the same: go back to the original agreement and show them what was agreed.

“The work wasn’t completed or wasn’t to standard”

Quality disputes are tricky because they are subjective. Did the client raise concerns during the project, or only after receiving the invoice? Were there clear deliverables in the brief? If the client signed off on the work or used the deliverables in their business, their position is significantly weakened. A client who published your copy on their website and then claims it was not good enough has a credibility problem.

“I never received this invoice”

Sometimes true, sometimes not. Emails do go to spam. Invoices do get lost in large organisations. The fix is simple: resend the invoice immediately, confirm delivery, and reset the payment clock. If this happens repeatedly with the same client, start requesting read receipts or sending invoices through multiple channels.

“We already paid this”

Check your bank account. If the payment is genuinely there and you missed it, apologise and move on. If it is not, ask for proof of payment: a bank transfer reference, a remittance advice, or a screenshot. Legitimate payers can produce this quickly. People who claim to have paid but cannot prove it are usually stalling.

“The scope changed and I shouldn’t owe the full amount”

Scope changes happen on almost every project. The question is whether you agreed to the changes in writing and whether the revised cost was communicated. If the client asked for additional work and you did it without confirming the price increase, you are in a weaker position. If you flagged the cost at the time and they approved it, the paper trail will settle this quickly.

Stop the reminder sequence immediately

The moment a client raises a dispute, pause any automated reminders. Continuing to send payment chase emails while someone is actively questioning the invoice is counterproductive. It looks like you are not listening and it will irritate them further.

Acknowledge the dispute in writing

Reply promptly to confirm you have received their concerns. You do not need to agree with them, just acknowledge that you are taking the matter seriously. Something like: “Thank you for raising this. I want to resolve it. Let me review the details and come back to you.”

Gather your evidence

Before responding in substance, pull together everything relevant: the original contract or agreement, email threads confirming the scope, any sign-off or approval of the work, delivery confirmations, and the invoice itself. You want the full picture before you make your case.

Respond within 48 hours with a clear, factual summary

Set out the facts calmly: what was agreed, what was delivered, what was invoiced, and why you believe the amount is correct. Reference specific documents and dates. Avoid vague statements like “we discussed this” and use concrete ones like “in your email of 14 January, you confirmed the revised scope at £2,400.”

Keep emotion out of it

Do not accuse them of lying. Do not threaten legal action in your first response. Do not copy in their boss or post about it online. Stick to facts, stay professional, and let the evidence speak for itself. If this does end up in court or mediation, everything you write will be reviewed.

Statutory interest still accrues

Under the Late Payment of Commercial Debts Act 1998, interest runs from the original due date regardless of whether the invoice is being disputed. However, courts have discretion. If a judge decides you acted unreasonably by refusing to engage with a legitimate dispute and instead insisted on full payment, they may reduce or waive the interest. The key is to show that you tried to resolve the issue while maintaining your right to be paid.

The Pre-Action Protocol matters

If a dispute cannot be resolved and you are considering court action, the Pre-Action Protocol for Debt Claims requires you to have made genuine attempts to resolve the matter before filing. This means engaging with the dispute, responding to the client’s points, and offering alternatives like mediation. Courts take the protocol seriously. If you ignored a reasonable dispute and went straight to court, you could face cost penalties even if you win.

Mediation is cheaper and faster than court

Courts actively encourage mediation and may penalise parties who unreasonably refuse it. For most freelancer disputes, mediation resolves the issue in a single session at a fraction of the cost of litigation. It is also less adversarial, which matters if there is any chance you might work with this client again.

If you made an error, issue a credit note and corrected invoice

Overcharged by mistake? Invoiced for work you did not complete? Wrong VAT calculation? Issue a credit note against the original invoice, then send a corrected one. Do it quickly and without fuss. Everyone makes mistakes. What matters is how you handle them.

If scope changed, agree the revised amount in writing

If the project evolved from what was originally agreed and neither side confirmed the updated cost, you are both partly responsible. Propose a revised amount that reflects the work actually delivered and get the agreement in writing. An email exchange confirming the new figure is sufficient.

Sometimes a partial discount is the smart move

Offering a small discount to settle a dispute quickly is not admitting defeat. It is a business decision. If accepting 90% of the invoice now means avoiding three months of back-and-forth, potential mediation costs, and the stress of chasing, it is often the better outcome. Calculate the true cost of continued dispute (your time, energy, opportunity cost) and make a pragmatic choice.

Small Business Commissioner

The Small Business Commissioner offers a free complaints and dispute resolution service for small businesses dealing with larger companies. If your client is a bigger business that is not paying, this is worth trying before anything else. It costs you nothing and the SBC has a decent track record of getting results.

CEDR and other mediation services

CEDR (Centre for Effective Dispute Resolution) is one of the UK’s leading mediation providers. Other options include local mediation services and some professional bodies that offer sector-specific dispute resolution. Costs vary but are typically £200 to £500 per party for a half-day session.

Cost comparison

Mediation typically costs £200 to £500. A small claims court case costs £35 to £455 in court fees alone, plus your time preparing the claim and potentially attending a hearing. For fast-track or multi-track cases (claims over £10,000), litigation costs can run into thousands. Unless the dispute involves a very large sum, mediation is almost always the better value option.

Pause reminders while you discuss

When a client raises a dispute, pause the automated reminder sequence with one click. No more awkward situations where a chase email lands in their inbox while you are in the middle of negotiating. Resume reminders when the dispute is resolved.

Track correspondence dates

PennyFetch logs when emails are sent, opened, and clicked. If a client claims they never received your invoice or that you did not respond to their concerns, you have a clear record of every communication.

Escalate to a Letter Before Action

If the dispute cannot be resolved, generate a professional Letter Before Action directly from PennyFetch. The LBA includes the invoice details, the amount owed, and a formal demand for payment within 14 days.

Calculate statutory interest from the original due date

The statutory interest calculator shows exactly what is owed from the original due date, including the daily interest rate and fixed compensation. Useful for both negotiation and formal demands.