Should I record phone calls with a client who owes me money?
The short answer
Yes, and say so. The Investigatory Powers Act 20161 counts a call as intercepted only if its content reaches someone outside the call, so recording your own call needs no consent under that Act. A business should still tell them at the start, because UK GDPR expects people to be told3 when their personal data is collected. A recording backs your memory, but the email you send within the hour is the record that does the work.
England and Wales only. WolfX is software, not a law firm.
What you can add
A £3,900 invoice, 45 days late
Say you invoiced another business £3,900, due on 17 July 2026. On a call on 11 August they promise to pay by Friday 14 August. You say you are recording, and the email goes out within the hour. The date passes. On 31 August the invoice is 45 days late. It went late in July, so the 11.75% rate for 1 July to 31 December 20269 applies.
Then it grows by £1.26 a day. The next move is the letter before action, with 14 days for a company.
The road ahead
Five steps. All free.
Step 1: Record only a call you are on
Section 32 makes unlawful interception an offence, but section 41 defines interception as content reaching someone who is not the sender or intended recipient. On your own call that is not you.
That covers your own calls, kept for your own records. Calls between other people are a different matter, and voicemails and chat apps are cases this page does not settle.
Step 2: Say it at the start
Open with one sentence: "I record calls so I have an accurate note. Is that all right?" Chasing an invoice is not a purely personal activity4, so the duty to tell people3 how you use their details is the reason to be open.
If they say no, stop recording, take notes and send the email. Article 13 also lists who you are, why you use the data and how long you keep it. A short privacy notice on your website or in your terms is the usual place for that.
Step 3: Email what was agreed within the hour
Send the email below: the invoice number, the sum and the date they promised, with a request to correct anything that is wrong. The law fixes no day for it. Within the hour is when the call is still fresh.
Step 4: Keep it, and know what it is for
Save the whole call under a clear name, such as "2026-08-11 call about invoice 4502", not the best minute of it. Keep it inside the dispute, do not post it or pass it on, and delete it once the matter is closed.
The court decides what it will look at. It can exclude proof5 that would otherwise be allowed, and in the small claims track the strict rules on what a court may look at do not apply6. So a judge may listen to it. It does not win a claim alone.
Step 5: If the date passes, send a letter before action
Quote the date they gave you and attach your email. A company usually gets 14 days to reply10. A sole trader gets 30 days11. The page on the letter before action has the wording.
A letter you can copy
Email confirming what was agreed on the call
Send it within the hour of the call, whether or not you recorded it.
Tap a highlighted gap to see what goes in it.
Send it by email so it is dated, and keep it with the invoice and the recording. If they asked you not to record, or you did not, delete the second sentence of the first paragraph.
When not to bother
When it isn't worth it
- The promise is already in writing. A plain reply email will do, and a recording adds little.
- The client is a friend or someone you want to keep. A recording can feel like a trap. Take notes and send the summary instead.
- The call is heated. Do not record it. Write down what was said straight afterwards and send the email.
- The call strays onto private matters. An illness or a bereavement has nothing to do with the debt. Stop recording and keep to notes.
- You or the client are in Scotland or Northern Ireland. The court rules and letter-before-action days on this page are for England and Wales; the other two nations have their own.
The Wolf's note
A recording shows what was said. An email shows what was agreed, and it is the one you can find in ten seconds. Record if you like, send the email either way, and let the date they gave you do the work.
Mr. Wolf · the AI inside WolfX
What comes next
Your next move
Put it in writing
What is a letter before action, and how do I write one?
A formal last letter before a court claim, and you can write it yourself.
7 min read · Letter included
My client disputes my invoice. What happens next?
The disputed part waits.
6 min read · Letter included
When it first goes quiet
My client keeps promising to pay but never does. What now?
Stop collecting promises.
6 min read · Letter included
Don't want to do this yourself?
The Wolf does every step for you. He works out the sums, writes the letters and keeps track of every date. Nothing goes without your yes.