How to send an invoice on WhatsApp. The UK tradesperson’s guide.

Can I send an invoice through WhatsApp? Yes — the law doesn’t care about the channel

There’s no rule in the UK that says an invoice has to go by post or email. What the rules care about is what’s on it. GOV.UK’s guidance on invoicing sets out what an invoice must include, and nothing in it mentions how it’s delivered. A PDF sent in a WhatsApp chat is as valid as the same PDF sent by email.

What isn’t an invoice is a bare text with a number in it. That’s a payment request. Fine between mates. Not fine as your business record, and not what a customer’s insurer or a landlord’s agent will accept when they ask for ‘the invoice’.

What a UK invoice has to have on it

Whatever you send — PDF, photo of a pad invoice, whatever — GOV.UK says it needs the basics:

• A unique invoice number — sequential, never reused. “INV-0147”, not “the boiler one”.
• Your business name, address and contact details.
• The customer’s name and address.
• A clear description of what you supplied — “Annual boiler service. Replace pressure relief valve, supply and fit.”
• The date you did the work and the date of the invoice — often the same day, sometimes not.
• The amount — each line, the VAT amount if there is one, and the total owed.

Then depending on who you are:

• Sole trader — your own name and any trading name, plus an address where legal documents can be served on you.
• Limited company — the full company name as it appears on your certificate of incorporation. If you put a director’s name on it, you have to put all of them.
• VAT-registered — GOV.UK is blunt on this one: invoices “must include your VAT number and display the VAT separately.” Not registered? Don’t mention VAT at all. You can’t charge it.

One more line that isn’t required but will save you grief: payment terms. If you don’t agree a date, the law says a business customer’s payment is late 30 days after they get the invoice or you finish the work, whichever is later. Put “Payment due within 7 days” on the invoice and you’ve set your own clock. (Private customers aren’t covered by the commercial late-payment rules — more on chasing them in the related guide below.)

2Your Business NameYour address, town and postcodePhone · email

Invoice1No. INV-01475Invoice date 14 Oct 2026 · Work done 14 Oct 2026

3Bill toMrs Shaw, 22 Beech Close

4Description	Amount
Annual boiler service. Replace pressure relief valve, supply and fit.	£185.00

6Total due£185.00

7Payment due within 7 days. Bank transfer using INV-0147 as the reference, or pay by card with the link.

1. 1A unique invoice number, in sequence, never reused.
2. 2Your business name, address and contact details.
3. 3The customer’s name and address.
4. 4A clear description of what you did.
5. 5The date of the work and the date of the invoice.
6. 6The amounts and the total. VAT-registered? Add your VAT number and show the VAT separately.
7. 7Payment terms and a way to pay. Not required, but it’s what gets you paid.

Three ways to send an invoice from your phone

1. A template, filled in and saved as a PDF. Word or Pages on the phone, a saved template, type the lines, export to PDF, attach in WhatsApp. It works. It’s also the one that doesn’t happen on a Tuesday night, because it’s twenty minutes of thumb-typing after a ten-hour day, and the invoice number ends up being whatever you last remembered.

2. An invoicing app that shares to WhatsApp. Most invoicing apps can produce a PDF and hand it to WhatsApp through the share sheet. Better: numbering is automatic, the logo’s on it, the maths is done. The catch is that the app is still an app — a login, a form, fields to fill, and the invoice lives in there while the conversation with the customer lives in WhatsApp. Two places. One of them gets forgotten.

3. A voice note to Jan. You tell the chat what you did and who for. A proper PDF comes back, numbered, branded, VAT handled, and it goes to the customer from the chat you were already in. More on that further down.

Whichever you pick: send a PDF, not a screenshot. PDFs don’t get cropped, they print properly, and a landlord’s agent can file them.

Getting paid in the same chat

Here’s the part the invoice template doesn’t solve. The customer has the PDF. Now what?

WhatsApp itself doesn’t take card payments in the UK — there’s no ‘pay’ button in the chat. So the invoice has to carry the way to pay, and there are two that work for trades:

• Bank details on the invoice. Sort code, account number, account name, and the invoice number as the reference. Most customers will do a bank transfer from their banking app while they’ve still got your chat open. Free, instant, and it’s what the majority of domestic customers do anyway.
• A pay link. A link on the invoice (or sent right under it) that opens a card payment page. Costs you a small fee per payment, but it’s a tap, and it’s the one that gets the slow payers moving because there’s nothing to type.

Put at least one of them on the invoice. Ideally both. The worst version is “bank details to follow”, because then the customer’s waiting on you, and that’s the day that turns into a week.

‘Stop running your business on WhatsApp’ — is that fair?

You’ll see this argument from the job-management software people. Powered Now published a post in July 2026 titled “Stop Running Your Gas Business on WhatsApp and Bits of Paper”, and the case it makes is that running on calls, chats, handwritten notes and spreadsheets means jobs get forgotten, quotes go out slow, invoices get left unsent, certificates get filed late and cash flow goes lumpy.

Credit where it’s due: they’re right about the problem. If your invoices exist only as messages in a chat, you don’t have a record. You can’t find them, your accountant can’t total them, and HMRC won’t accept a scroll through a thread as a digital record.

Where we’d disagree is the cure. The chat isn’t the problem. The chat is where the customer is, and where you are. The problem is that nothing behind the chat is writing it down. Fix that — make sure every invoice that goes out of WhatsApp is logged, numbered and categorised somewhere — and WhatsApp becomes the best delivery channel a one-van trade has got. You don’t need to drag the customer onto a portal to get your books straight.

Keep it MTD-ready

Which brings us to the bit that matters from April 2026 onwards. Making Tax Digital for Income Tax asks you to keep a digital record of each sale — the date, the amount and a category — in software that works with MTD, and to send HMRC quarterly totals. A WhatsApp message is none of those things.

So the rule is simple. Every invoice you send on WhatsApp has to exist in two places: in the customer’s chat, and in your books. If your process doesn’t put it in the second place without you doing anything extra, it won’t be there in November when the quarterly update is due. Pick a way of sending invoices where logging it is a side effect, not a separate job.

WhatsApp Business or your normal WhatsApp?

Either works for sending invoices. WhatsApp Business is a separate app from Meta, free to download, built for small businesses, with a business profile, a showcase of your services and prices, and greeting and away messages so a customer who messages at 9pm gets “Back on it at 7am” instead of silence.

Two things to know before you switch. Your number can only be on one of the two apps at a time, so moving across is a move, not a copy — back up your chats first. And none of it changes the invoice rules above. Business or personal, the PDF still needs the number, the details and the VAT line.

So we built it into the chat you already live in

The Back Office isn’t an app to download. It’s WhatsApp — or Telegram if that’s your one — with Jan running the back office behind it.

Van loaded, customer’s brew finished. You press and hold: “Invoice Mrs Shaw, 22 Beech Close. Annual boiler service and new pressure relief valve, supply and fit. One eighty-five.” What comes back is a proper PDF invoice — numbered, your logo on it, the work itemised, VAT handled if you’re registered, a pay link on it — for you to check. Say it’s good and it goes to Mrs Shaw, by WhatsApp if she’s on it, by email if she isn’t. It’s logged in your books at the same moment, date and amount and category, so it’s sat there for the quarterly update. And if she goes quiet, Jan does the chasing — polite first, firmer later.

Invoicing on WhatsApp for tradespeople: quick FAQ

The customer asked for the invoice on WhatsApp because that’s where she is. Send a proper one there, with a way to pay, and log it behind the chat. That’s the whole trick.

Where these figures come from

Every rule in this guide is linked to its source below, with the date we checked it. Rules change — if you are reading this a long way from the date at the top, check the originals.

• What an invoice must include (unique number, business details, customer details, description, supply date, invoice date, amounts, VAT if applicable, total); extra requirements for sole traders and limited companies — GOV.UK, Invoicing and taking payment from customers: Invoices – what they must include: gov.uk/invoicing-and-taking-payment-from-customers/invoices-what-they-must-include
• VAT invoices “must include your VAT number and display the VAT separately” — GOV.UK, VAT record keeping: VAT invoices: gov.uk/vat-record-keeping/vat-invoices
• A business payment is late 30 days after the customer receives the invoice or you deliver the work, whichever is later, if no date was agreed; agreed terms usually within 60 days — GOV.UK, Late commercial payments: charging interest and debt recovery: gov.uk/late-commercial-payments-interest-debt-recovery
• Digital records must show the amount, date and category in software that works with MTD; quarterly updates are category totals — GOV.UK, Use Making Tax Digital for Income Tax: Create digital records and Send quarterly updates: gov.uk/guidance/use-making-tax-digital-for-income-tax/create-digital-records · gov.uk/guidance/use-making-tax-digital-for-income-tax/send-quarterly-updates
• WhatsApp Business app: business profile, showcasing products and prices, greeting and away messages — WhatsApp Business, The WhatsApp Business App: business.whatsapp.com/products/business-app/ (free on the App Store and Google Play; one number can be registered to only one of the two apps at a time)
• “Stop Running Your Gas Business on WhatsApp and Bits of Paper”, 3 July 2026 — Powered Now blog: powerednow.com/blog/stop-running-your-gas-business-on-whatsapp

All sources checked 21 October 2026.

Related guides

• The 12-second quote: voice note in, branded PDF out
• MTD digital records: do I have to upload receipts?
• Customer won’t pay your invoice? What UK tradespeople can actually do
• Do I need to register for VAT? The £90,000 question