Retyping PDF invoices
of UK small and medium businesses mainly receive invoices as PDF or email, not as data. Someone has to read each one and get the details into your system.
bunsun reads every invoice and fills in the fields for you.
Stop keying supplier invoices by hand.
bunsun reads the invoices your suppliers email you, checks VAT, totals and the purchase order, catches duplicates and exports clean data to your finance system. Sending invoices too? We check them before they go, so they get paid on time. Ready for UK e-invoicing in 2029, with Peppol coming soon.
Receiving always freeNo setup feePeppol: coming soon
Example month · figures are illustrative
Supplier invoices, October
A London housing association · 412 suppliers
Unit4 · exported hourly
- Invoices receivedby email and PDF, Peppol soon1,284
- Duplicates caughtsame invoice sent twice, or by two routes−14
- Errors fixed before paymentwrong VAT, totals that don't add up, missing PO59
- Went straight throughno human touch, matched to the purchase order1,168
- Exported to Unit4approved, matched and posted1,227
INV-1048 · £1,500.00Delivered
- ✓Created13:58
Read from PDF
- ✓Checked13:58
VAT, totals and PO all correct
- ✓Sent14:01
to Thameside Housing Trust
- ✓Delivered14:02
accepted by their invoices inbox
- …Waiting for approval
usually within 2 working days
- Paid
expected around 15 Nov
sound familiar?
Where invoice time goes today
Most UK businesses still swap invoices as PDFs. Someone reads each one, keys it in and chases whatever is wrong. That is the work bunsun takes off your hands.
Invoices bounced for a missing PO
Many councils and large buyers reject invoices without a valid purchase order, and the wait for payment starts again.
Sending: we check for the PO before it goes. Receiving: every invoice is matched to its PO on arrival.
Duplicates and wrong amounts
The same invoice arrives twice, by email and by post, or the price is higher than what was ordered. Spotting it by eye is slow and easy to miss.
Duplicates, VAT mistakes and prices above the PO are flagged before anything is paid.
Late payment
a year is what late payment costs the UK economy. Tighter rules are on the way, including a planned 60-day cap on payment terms for large firms paying smaller suppliers.
Clean invoices go straight through. The rest reach you on day one, not day 50.
Sources: HMRC, e-invoicing research with small and medium businesses (published March 2026); Department for Business and Trade, late payment announcement (March 2026).
why now
From April 2029, every UK VAT invoice must be an e-invoice.
PDFs by email won't count. Businesses will send and receive invoices as structured data over Peppol, through a provider of their choice. Late-payment rules are getting tighter too, so teams still keying invoices by hand will feel both. We're building our Peppol service now, so you're ready well before the deadline.
Apr 2029E-invoicing required for B2B and public-sector VAT invoices
PeppolConfirmed by HMRC as the UK's e-invoicing network (June 2026)
60 daysPlanned cap on payment terms when large firms pay smaller suppliers (announced March 2026, not yet law)
TodayThe NHS already asks suppliers for Peppol invoices
50+Countries on Peppol, so one connection reaches buyers abroad
how it works
One product for the invoices you send and the ones you receive.
Most businesses do both. On the Purchases side, bunsun automates invoice processing. On the Sales side, it checks your invoices before they go. Same tracking on each.
Sales · invoices you send
Get paid without the back-and-forth.
For suppliers of any size. Free to start.
- Upload the PDF you already makeOr type it in. We read it and fill in the fields.
- We check it against your customer's rulesPO numbers, VAT, totals. Problems are explained in plain English, before you send.
- Send itBy email today, and over Peppol as soon as it launches.Peppol soon
- Track it like a parcelDelivered, approved, paid. If something goes wrong, we tell you first.
Purchases · invoices you receive
Clean data in. No retyping.
For finance teams paying dozens or thousands of suppliers.
- Invoices arrive however suppliers send themEmail or PDF today, Peppol soon, all into one queue.
- Every invoice is checked on arrivalMatched to the purchase order. Duplicates and price differences flagged.
- Review only the exceptionsThe PDF next to the data, with the reason it was flagged.
- Export to your finance systemA file ready for Unit4, Dynamics, Oracle, Sage or Xero. Direct connections on the way.
Follow one invoice. Brightwell Cleaning sends it on the Sales side. Thameside Housing Trust receives it on the Purchases side.
compared
How bunsun compares
How invoices move today, and what each option gives the people sending and receiving them.
| PDF by email | Legacy supplier networks | Accounting software add-ons | bunsun | |
|---|---|---|---|---|
| Meets the 2029 rulesStructured e-invoices over Peppol. | ✕ | ◐varies | ✓for their users | ◷coming soon |
| Free for suppliersNo fee to join or to receive. | ✓ | ◐often paid | ◐with a subscription | ✓ |
| Reach any buyerOne registration, every Peppol buyer. No network per customer. | ✓ | ✕one network each | ✓ | ◷with Peppol, soon |
| Checked before sendingBuyer's rules, VAT and totals checked up front, explained in plain English. | ✕ | ◐rejected later | ◐format only | ✓ |
| Track to paidSee every step, with a reason if anything stops. | ✕ | ◐portal lookup | ◐sent / paid | ✓ |
| Clean data for buyersPO matching, duplicate checks, export to the finance system. | ✕retyping | ✓ | ◐small volumes | ✓ |
| Live in daysSelf-serve sign-up. Buyer onboarding without a project. | ✓ | ✕weeks to months | ✓ | ✓ |
| Published pricesOn this page, not behind a sales call. | ✓ | ✕quote only | ✓ | ✓ |
| Public service statusUptime and incidents, posted before you have to ask. | – | –not stated | ◐some | ✓ |
✓ yes · ◐ partly · – not stated publicly · ✕ no · ◷ coming soon. Categories are judged in general from public information as of October 2026; individual providers vary. The bunsun column describes the service at launch.
pricing
Pay per invoice. Less as you grow.
No plans, no setup fees, no minimum term. You pay only for the invoices you send and the invoices we check for you, and the rate drops as your volume grows.
| Invoices each month | Price each |
|---|---|
| First 10 | Free |
| 11 – 200 | £0.22 |
| 201 – 1,000 | £0.18 |
| 1,001 – 5,000 | £0.12 |
| Over 5,000 | £0.08or talk to us |
Includes checks before sending, tracking to paid, PDF to e-invoice and email delivery. Peppol sending at no extra cost when it launches.
Receiving is free. Invoices arrive in your inbox to view, download and approve, at no cost and with no limit.
| Invoices checked each month | Price each |
|---|---|
| First 10 | Free |
| 11 – 200 | £0.28 |
| 201 – 1,000 | £0.16 |
| 1,001 – 5,000 | £0.09 |
| Over 5,000 | £0.07or talk to us |
Checking & matching: we read the invoice, check VAT and totals, match it to the purchase order, catch duplicates and export it to your finance system. Exceptions come to you with the reason. Supplier onboarding is free.
Estimate your monthly cost
£59.80a month · £0.199 per invoice
Ex VAT. Billed monthly in arrears; balances under £5 roll over to the next month.
Receiving is always free, and your first 10 invoices each month cost nothing. Annual commitments for large volumes on request.
free check
Is your business, or your customer, on Peppol?
Search the official Peppol Directory by company name or VAT number. Most UK businesses aren't registered yet, which is normal this far before 2029.
questions
E-invoicing and invoice processing, answered
What is e-invoicing?
An e-invoice is an invoice sent as structured data instead of a PDF or paper. The buyer's system can read it directly, so nobody has to key it in.
When does e-invoicing become mandatory in the UK?
The government has announced that from April 2029, VAT invoices between UK businesses and to the public sector must be e-invoices. More detail, including how it will be phased in, is expected at the November 2026 Budget.
What is Peppol?
Peppol is an international network for sending e-invoices between businesses, used in over 50 countries. In June 2026 the UK confirmed Peppol as the core network for UK e-invoicing. You connect once through a provider and can then reach any business on the network.
Can bunsun process PDF invoices?
Yes, that is what we are launching with. Forward your invoices inbox to bunsun or upload PDFs, and we read, check and match each one to its purchase order before exporting it to your finance system. Peppol becomes another way in when our Peppol service launches.
Is bunsun a certified Peppol provider?
Not yet. We are building our Peppol service and will complete OpenPeppol certification before we offer it. Until then, we do not send or receive invoices over Peppol for you.
Which finance systems does bunsun work with?
We export a file ready to import into Unit4, Microsoft Dynamics, Oracle, Sage or Xero. Direct connections are on the way.
Do I need to change my accounting software?
No. bunsun works alongside the system you already use. Invoices come in through bunsun and go into your finance system as a file.
How much does bunsun cost?
You pay per invoice, and the first 10 each month are free. Sending starts at £0.22 an invoice and checking at £0.28, and the price drops as your volume grows. Receiving invoices is always free.