To recover an unpaid business invoice, first confirm the debt and evidence, then move through a documented sequence: a clear reminder, direct contact, a final deadline, assessment of any dispute or risk, professional recovery and - only where proportionate - legal escalation. The aim is to create a decision, not simply send more messages.
An overdue invoice can quickly become familiar background noise. A reminder is sent, a promise is made, another date passes and the account remains unresolved. The strongest recovery process replaces that drift with clear ownership, evidence and deadlines.
This guide is for UK businesses recovering money owed by another business. It explains the practical sequence from the first overdue reminder to external commercial debt recovery and possible legal action. It does not cover consumer debts or regulated consumer-credit matters.
Start by checking that the invoice is genuinely due
Before increasing pressure, make sure the balance is accurate and the customer has what they need to approve payment. A preventable administrative problem can look like deliberate non-payment if the account has not been checked carefully.
- Confirm the correct legal customer name and billing address.
- Check the invoice number, issue date, due date and payment terms.
- Match the invoice to the quotation, contract or purchase order.
- Retain delivery notes, timesheets, acceptance records or other evidence of supply.
- Apply any credits and payments correctly so the statement balance is reliable.
- Confirm that the invoice was sent to the right person or accounts-payable address.
If the customer raises a genuine issue, record it precisely. Ask what part of the invoice is disputed, why, what evidence supports the position and whether the undisputed amount will be paid. Avoid allowing a vague reference to a “query” to suspend the whole account indefinitely.
Use a structured invoice-chasing sequence
The timing should reflect the contract, customer relationship, value and risk, but each contact should have a purpose. Repeating the same general reminder rarely changes the outcome.
Friendly overdue reminder
Confirm the invoice, balance and due date. Attach a copy and ask whether anything is preventing approval or payment.
Direct conversation
Contact the person responsible for the account. Establish whether the issue is administrative, financial or a genuine dispute.
Written commitment
Record any promise to pay, including the amount, method and date. Follow up promptly if the commitment is missed.
Final internal deadline
State the balance, the action required, a reasonable final date and the next step if the account remains unresolved.
Rezolva’s free invoice chaser email generator can help create a professional final internal reminder. Keep the wording factual. Do not threaten action that the business has not considered or is not prepared to take.
Create a clear final invoice reminder
Generate tailored seven-day wording before deciding whether the account should move to professional recovery.
Record every promise, response and missed date
A good chronology is useful commercially and may become important if the debt is referred. Keep copies of emails and letters, concise notes of calls, the name and role of each contact, payment promises, dispute details and any documents exchanged.
After a call, confirm the important points in writing. A short email recording the agreed amount and payment date is clearer than relying on memory. If the customer changes its explanation, the chronology will also help identify what needs to be tested.
Consider late-payment interest and recovery costs carefully
UK legislation may allow a supplier to claim statutory interest and fixed compensation on qualifying late commercial payments. Contractual terms can affect the position, and the parties, transaction and evidence still need to be reviewed before amounts are claimed.
Use Rezolva’s late-payment calculator to estimate the potential commercial impact and understand the turnover that may be needed to replace a bad-debt loss. The result is an estimate, not a substitute for checking the legal and contractual basis.
Know when internal credit control has stopped working
More chasing is not always better chasing. Consider a different next step when:
- reminders and calls no longer receive a meaningful response;
- payment promises are repeatedly missed;
- new invoices are increasing the total exposure;
- a dispute is asserted but not explained or evidenced;
- the customer’s trading position or behaviour appears to be deteriorating;
- your team is spending time without changing the position; or
- the age of the debt is reducing the available commercial options.
The commercial debt recoverability assessment provides a structured check of age, evidence, debtor engagement, dispute position and contact history before referral.
Prepare the account for professional recovery
A commercial debt recovery specialist should receive one clear account position rather than a folder of unexplained documents. Prepare:
- the debtor’s correct legal and trading details;
- the total balance and oldest due date;
- the statement, invoices and credit notes;
- the contract, terms, purchase orders and evidence of supply;
- a summary of reminders, calls and payment promises;
- full details of any dispute, admission or proposed payment plan; and
- your commercial objective, including whether the relationship should be preserved.
Rezolva’s commercial debt recovery service uses professional, relationship-led contact to seek payment, meaningful engagement or properly evidenced dispute information. Clients can place the full account and follow progress through Rezolva Connect.
Review legal escalation separately
Commercial collection and legal proceedings are different decisions. A Letter Before Action may be appropriate where the evidence is strong, the correct entity has been identified, the balance is clear and voluntary recovery has not resolved the matter. The likely cost, proportionality, dispute risk and ability to enforce any judgment should be considered before proceedings begin.
Read Rezolva’s guide to a Letter Before Action for unpaid invoices and the overview of legal debt recovery. Formal action should not be used merely to produce another threat; it should follow an informed commercial decision.
Reduce the chance of the next invoice becoming overdue
Recovery should feed back into credit control. Review what the account reveals about customer onboarding, credit limits, purchase-order requirements, invoice delivery, dispute handling, reminder timing and escalation authority.
Rezolva’s credit control health check assesses the wider process, while credit management support can help businesses strengthen the controls behind invoicing, collections and escalation.
A practical unpaid-invoice checklist
- Verify the legal customer, balance, terms and due date.
- Collect the contract, invoices and proof of supply.
- Confirm the invoice reached the correct payer.
- Send a clear reminder and ask what is preventing payment.
- Record all responses, promises and disputes.
- Issue a final internal deadline with a credible next step.
- Review late-payment charges and continued trading risk.
- Assess whether professional commercial recovery is appropriate.
- Consider legal escalation separately and proportionately.
- Use the outcome to improve future credit-control decisions.
Assess the overdue account before placing it
Check the evidence, engagement, age and dispute position, or create a free Rezolva account when the debt is ready for recovery.
Frequently asked questions
How long should I wait before chasing an unpaid invoice?
Begin with the agreed payment terms. Contact the customer promptly after the due date unless the relationship or contract justifies a different timetable. Delay can make the account harder to understand and resolve.
What should a final invoice reminder include?
Include the correct customer, invoice references, total balance, due date, how to pay, a clear response deadline and the next step if the account remains unresolved. Keep the wording factual and professional.
Can I charge interest on an unpaid business invoice?
Statutory interest and fixed compensation may be available on qualifying late commercial payments, but the contract, parties and transaction can affect the position. Check the applicable basis before adding or claiming amounts.
When should I use a commercial debt recovery agency?
Consider referral when ordinary reminders no longer create payment, useful evidence or a credible proposal. Missed promises, increasing exposure, stalled disputes and worsening risk can justify earlier review.
Do I need a Letter Before Action before using debt recovery?
No. Professional commercial recovery can begin without court proceedings. A Letter Before Action is a separate legal-escalation step that should follow review of the evidence, proportionality, dispute risk and intended next action.
What if the customer disputes only part of the invoice?
Ask the customer to identify the disputed amount and evidence. Seek payment of any clearly undisputed balance while the genuine issue is investigated and documented.
Official sources and further reading
Important: This guide provides general information for UK businesses and is not legal advice. The correct route depends on the contract, parties, debtor type, evidence, dispute, limitation position and jurisdiction.
