Yes. No UK rule says which channel an invoice has to travel by, and a payment link in a WhatsApp message works the same way as one in an email: your customer taps it, picks a payment method and approves. Ask your customer first, send from a business number, and send the link rather than a PDF.
In this article
The short version
- Yes: a payment link works in WhatsApp just as it does in email.
- Ask your customer first and record their agreement.
- Send the link, not a PDF, from a business number.
- It suits sole traders and people away from a desk; finance teams prefer email.
- For recurring work, direct debit will do more than any channel.
How it works
You send a message with a payment link tied to one invoice. Your customer opens it on the phone they're already holding, chooses card, Apple Pay, Google Pay or pay by bank, and approves with a face or a fingerprint. Because the link carries your invoice reference, the payment can be matched to the right invoice without anyone typing it in.
The link helps because of the steps it removes. An email with a PDF attached asks your customer to find it, open it, then copy your bank details into a banking app. A link in a message they've already opened asks for one tap and one approval. That's why it tends to suit customers who are rarely at a desk.
If you're VAT registered, HMRC lets you issue invoices electronically as long as your customer agrees to receive them that way and the invoice carries the required details. If you need to send the invoice document as well, a link to view and download it works better on a phone than an attachment in a chat.
Which customers it suits
| Customer | Does WhatsApp help? |
|---|---|
| Sole traders and micro businesses | Often. They run their business from their phone |
| Small firms without a finance team | Usually, especially where email goes unread for days |
| Trades and field-based customers | Yes, they're rarely at a desk |
| A finance team with a weekly payment run | Not much. Their approval process runs on email |
| Anyone who's asked you not to | No |
Match the channel to the customer instead of picking one for everybody. WhatsApp isn't better than email in itself, but it helps to reach each customer where they actually read their messages.
How to do it properly
Treat it much as you'd treat phoning the same person.
- Ask first. Get your customer's agreement to be contacted on WhatsApp and record it, for example on your engagement letter or onboarding form. WhatsApp's own business policy also requires their opt-in before you message them.
- Use a business number, not your personal one. It keeps the record with the business and makes it clear who's messaging.
- Keep it recognisably you: your business name, the invoice number, the amount, the due date and the link. Leave out the chatty note.
- Stick to your normal schedule. A channel that reaches someone instantly makes it tempting to chase more often, and that can tip a reminder into pressure.
- If someone asks to go back to email, move them back.
If you'd rather not run this from someone's phone, Adfin sends payment links and reminders over email, SMS or WhatsApp, branded as your business and on a schedule you set. Its collection agents can learn which channel each customer responds to and follow up there, within rules you approve.
When something else works better
For work you invoice every month, a direct debit mandate will probably do more than any choice of channel, because the customer doesn't have to act each time. You collect on the agreed date, and the message only has to say the payment is coming.
On a large invoice that needs approval at the customer's end, the channel isn't what's slowing things down. A WhatsApp message can get your request to the right person faster, but it won't speed up their sign-off, so confirm early who approves the invoice and when their payment run is.
Common questions
Can you legally send an invoice by WhatsApp? No rule fixes the channel an invoice is sent by. For a VAT invoice, your customer needs to agree to receive invoices electronically, and WhatsApp itself requires their opt-in.
Does a payment link work in WhatsApp? Yes. It works as it does in an email: your customer taps it, chooses a method and approves.
Should I send the PDF or the link? The link. A PDF in a chat is awkward to act on from a phone, and the link lets your customer pay straight away.
Is it unprofessional to chase payment on WhatsApp? Not if your customer has agreed to the channel and the message reads like it's from a business. It starts to feel unprofessional if you chase more often than you would by email.
Do clients prefer WhatsApp to email for invoices? Some do, particularly sole traders and people who aren't at a desk. Larger finance teams usually prefer email because their approval process runs on it.
Can Adfin send payment links by WhatsApp? Yes. Adfin sends payment links and reminders by email, SMS or WhatsApp, branded as your business and on a schedule you set.
Sources
- GOV.UK - Invoicing and taking payment from customers (accurate as of October 2026) https://www.gov.uk/invoicing-and-taking-payment-from-customers
- HMRC - Electronic invoicing (VAT Notice 700/63) (accurate as of October 2026) https://www.gov.uk/guidance/electronic-invoicing-notice-70063
- WhatsApp - Business Policy (accurate as of October 2026) https://whatsappbusiness.com/policy/
- Adfin - Credit control (accurate as of October 2026) https://www.adfin.com/credit-control
