Invoice Dispute Resolution Checklist

Before you start

Resolving a dispute well depends on having the basics in front of you before you respond. Gather the invoice, the underlying quote or contract, any purchase order, delivery dockets or timesheets, and the full email and message trail. Read the customer's complaint carefully and decide what they are actually disputing — the price, the scope, the quality, or simply the timing.

• Locate the invoice, contract or quote, and any purchase order.
• Pull together proof of delivery: dockets, sign-offs, timesheets or photos.
• Re-read the customer's complaint and identify the exact point in dispute.
• Check whether part of the invoice is genuinely undisputed.

This is general information only and not legal advice — for a specific dispute, especially a large one, get professional advice before you commit to a position.

Acknowledge and contain the dispute

1. Reply in writing within a day or two confirming you have received the query and are reviewing it.
2. Ask the customer to set out their concern in writing if they have only raised it by phone.
3. Confirm the parts of the invoice that are not in dispute and invite payment of those now.
4. Set a realistic date by which you will respond in full, and keep to it.

Containing the dispute early stops a small disagreement about one line item from freezing the whole invoice. Most customers will pay the undisputed portion once you ask plainly, which protects your cash flow while you sort out the rest.

Investigate and respond

1. Match each disputed item back to what was agreed in the contract or quote.
2. Test the customer's version against your records and note where they differ.
3. Decide whether you will hold firm, offer a partial credit, or correct a genuine error.
4. Put your response in writing, attaching the evidence that supports your figure.
5. Offer a clear path to settle — a revised invoice, a credit note, or a payment plan.

A calm, evidence-led response often resolves the matter on its own. If you find you did get something wrong, fixing it quickly and issuing a corrected invoice usually preserves the relationship far better than defending an error.

Common mistakes

• Going silent — delay reads as weakness and lets the customer assume you have conceded.
• Letting one disputed line hold the entire invoice hostage instead of splitting it out.
• Negotiating only by phone, leaving no written record of what was agreed.
• Caving on the full amount just to end the argument, with no documented reason.
• Threatening recovery before you have actually responded to the substance of the complaint.

If the dispute stalls or the amount is significant, a free debt appraisal can help you weigh your options before you spend money chasing it.