Prove the debt before you pay a collector

If a collector contacts you about an account you do not recognise, the first job is evidence. Paying quickly can be a mistake if the balance, creditor or legal right to collect is unclear.

This guide was last checked on 26 April 2026 against official court, government, regulator, or legislation sources listed on this page.

Quick answer

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• A prove-the-debt letter asks the collector to show why they say you owe the money, who the original creditor was, and how the balance has been calculated.
• Use it before paying a debt you do not recognise.
• Ask for assignment evidence if the debt has been sold.
• Use a CCA request as well if the debt is regulated consumer credit.

What this means

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Debt collectors should be able to explain what they are collecting and why. The level of proof needed can depend on the debt type and stage of collection.

This is especially useful for old addresses, sold accounts, duplicate balances, unknown reference numbers and debts that may belong to someone else.

What to check first

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• Check the name, address and account reference.
• Check whether the original creditor is named.
• Check whether the amount matches your records.
• Check whether the debt may be old or already paid.
• Check whether any formal legal deadline applies.

What to do next

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1. Write asking for evidence and a statement of account.
2. Do not admit liability while evidence is unclear.
3. Keep the reply and envelope.
4. Escalate to a formal complaint if the collector keeps pressing without evidence.
5. Get advice if court papers, a Letter of Claim or enforcement notice arrives.

Keep copies of anything you send. If you speak by phone, write down the date, time, person you spoke to, and what was agreed.

What not to do

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• Do not pay just because a letter looks official.
• Do not ignore a court form while waiting for evidence.
• Do not give unnecessary personal data by phone.
• Do not agree a repayment plan before priority bills are protected.

When an IVA may help

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An IVA may help once genuine qualifying debts are identified and the whole debt position is unaffordable.

An IVA is a formal insolvency solution. It can affect your credit file, borrowing, assets, and future financial choices. It should be compared with a Debt Management Plan, Debt Relief Order, bankruptcy, informal arrangements and Breathing Space before you choose.

When an IVA may not solve this

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If a collector cannot prove the debt, a dispute route may be better than putting that account into an IVA. Evidence first, solution second.

If you are unsure, get regulated debt advice before relying on any single option.

What to do today

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1. Put the letter somewhere safe.
2. Check your credit files and bank records if helpful.
3. Send a written evidence request.
4. Do not admit the debt until you understand it.
5. Review the full budget if several debts are proven.