Short answer
Prepare the contract, invoice, delivery evidence, payment terms, interest calculation, debt recovery costs, dispute correspondence, company details and any claim or insolvency papers.
Quick checklist
Start with these
Best order
How to organise the first pack
- Put the contract, invoice and due date first.
- Add proof of delivery, completion or acceptance.
- Show how interest and recovery costs are calculated.
- Separate liability disputes from payment-delay correspondence.
- Flag any claim, statutory demand or insolvency deadline.
Identify The Payment Terms
Start with the parties, contract, invoice amount, due date, goods or services supplied and whether the debtor disputes liability, amount, quality or set-off.
Explain whether advice is needed on a letter, claim, defence, interest calculation, settlement, statutory demand, insolvency risk or hearing preparation.
Documents To Gather
The pack should show why the debt is due, when it became late and how interest or recovery costs have been calculated.
- Signed contract, purchase order, terms and conditions and variations.
- Invoice, statement of account, delivery note, completion certificate or acceptance evidence.
- Payment due date, agreed credit period and any disputed payment-term wording.
- Interest calculation, statutory or contractual basis and recovery-cost calculation.
- Chaser emails, complaint responses, set-off allegations and settlement offers.
- Money claim, statutory demand, winding-up, mediation or insolvency papers if any.
What A Barrister May Be Asked To Do
A barrister may advise on the debt evidence, interest, pleadings, defence prospects, settlement, interim application, statutory-demand response or hearing preparation where suitable.
Some matters need solicitor support for issuing claims, service, enforcement, disclosure, insolvency procedure or ongoing correspondence.
Commercial Review Note
This guide does not decide whether to sue, serve a statutory demand, negotiate or withhold payment. Those decisions depend on the contract, evidence, solvency and current legal advice.
Avoid delays
What not to send first
- Sending a spreadsheet without the contract terms.
- Leaving out dispute correspondence or set-off allegations.
- Combining multiple invoices without a clear schedule.
- Assuming late payment interest removes the need to prove the debt.
Source note: source-checked against GOV.UK late commercial payment interest and debt-recovery guidance on 22 September 2026. Contract terms, statutory interest, set-off, insolvency, limitation and costs issues need specialist commercial review.
Claim and official-source ledger
- GOV.UK guidance says a business can claim interest and debt recovery costs if another business is late paying for goods or a service.
- Late commercial payments: charging interest and debt recovery — GOV.UK; checked .
- GOV.UK guidance sets fixed debt recovery cost amounts by debt band for late commercial payments.
- Late commercial payments: charging interest and debt recovery: Claim debt recovery costs on late payments — GOV.UK; checked .
Editorial status: Review required. Sources support the identified claims only. General information; not legal advice.
Late Payment Interest Business Debt Barrister Evidence Guide FAQs
Can businesses claim interest on late commercial payments?
GOV.UK guidance says a business can claim interest and debt recovery costs if another business is late paying for goods or services, subject to the facts and terms.
What papers should be sent with an unpaid invoice dispute?
Send the contract, invoice, delivery or completion proof, payment terms, chasers, dispute responses, interest calculation and any court or insolvency documents.
Is this the same as insolvency advice?
Not always. Late payment, money claim, statutory demand and insolvency routes have different risks and evidence needs.
Ask For A Barrister Quote
Barristers4U helps clients request a quote from a suitable Direct Access barrister. The information on this page is general information only, not legal advice about your individual circumstances.
If your matter is urgent, include hearing dates, court deadlines, orders and any documents you already have when you submit your enquiry.
