Invoice-to-Pay Process: A Practical Guide for UK Businesses

An invoice-to-pay process gives a UK business one controlled route from the moment a supplier invoice arrives until its payment and ledger record are reconciled. The right workflow depends on your invoice volume, systems and supplier relationships.

This guide explains the practical invoice-to-pay process for UK businesses, including invoice intake, matching, approval, payment and reconciliation.

We've also explained what makes Wise Business a suitable business account for businesses using the I2P process.

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Note: Wise Business offers a free Essential plan for basic spending and transferring. If you need to receive money, set up direct debits, or generate invoices, you'll pay a one-time £50 setup fee to unlock the Advanced features.

Wise services and features are not available in all regions, country and product restrictions apply. Visit wise.com to check availability, and for fee details and terms for your region, visit our pricing page for Wise Business.

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Invoice-to-pay process: steps at a glance

Step-by-step invoice-to-pay process

1. Receive invoices through one controlled route

Use a dedicated accounts-payable inbox, portal or e-invoicing connection. Record when the invoice arrived and retain the original document or structured data, rather than relying on a copy forwarded from an individual's mailbox.

According to GOV.UK, e-invoicing is the digital exchange of invoice information directly between buyers' and suppliers' financial systems, including where those systems are different.¹ It can sit alongside a monitored inbox or portal, but each route should lead to the same AP queue.

2. Capture the invoice data and retain the evidence

Capture the supplier name, invoice number, issue date, due date, PO reference, currency, line items, tax and total. A unique internal reference makes an invoice easier to search, match and screen for duplicates.

For VAT-registered businesses, retain the invoice evidence as well as the data entered into the ledger. According to HMRC's VAT record-keeping guidance, an invoice's original form must still be kept when only selected data is entered into functional compatible software; a retained scanned image can meet the requirement when it contains the required VAT detail.²

Note: This content is provided for general educational and informational purposes only. It is not intended to provide legal, tax, financial, investment or professional advice and should not be relied upon as such.

3. Validate the supplier and invoice before matching

Confirm the invoice is addressed to the right legal entity and matches the approved supplier record. Check the supplier name, invoice number, dates, tax treatment, currency, payment terms and beneficiary details before it progresses.

Treat a new or changed bank account as a separate control point. According to the National Cyber Security Centre's guidance on business payment fraud, criminals may impersonate a regular contact, send a realistic-looking invoice or request payment to a different account.³ Contact the supplier using an established contact route, not the number or address in an unexpected change request.

4. Match the invoice to the purchase evidence

Where a PO exists, compare the invoice with the approved PO and evidence that the goods or services were received. A two-way match compares the invoice and PO; a three-way match also checks the receipt.

Define how non-PO invoices are handled rather than allowing them to bypass control. For any mismatch, record the reason, owner and next action. That creates a clear exception queue instead of leaving a disputed or incomplete invoice in a general inbox.

5. Route the invoice for approval

Send the matched invoice, or its documented exception, to the person accountable for the spend. Approval rules can be based on value, department, project, category or risk. Larger or unusual invoices may need more than one approval.

The approver should be able to confirm that the purchase was authorised, the goods or services were received and the amount is correct. An approval record should show who approved, when they approved and any exception they accepted.

6. Post the approved invoice to the ledger

Code the invoice to the correct supplier, account, cost centre, project, tax code and accounting period. Posting records the liability and creates the information your finance team needs for cash planning and management reporting.

Review unusual coding, manual journals and suspense-account postings. If the coded record can't be connected back to the invoice and approval, reconciliation becomes slower and the audit trail becomes weaker.

7. Authorise and execute the payment

Schedule payment in line with the agreed terms, payment calendar and any approved hold. Before release, compare the final payment instruction with the invoice and approved beneficiary record: recipient, account details, amount, currency, reference, date and authorisations all need a final check.

According to GOV.UK's guidance on late commercial payments, an agreed business-to-business payment date must usually be within 60 days, unless a longer period has been agreed and is fair to both businesses.⁴ This is a payment-term rule, not a reason to release an invoice before its checks are complete.

8. Reconcile the payment and close the invoice

Match the payment confirmation and bank transaction to the posted invoice, then update the invoice status. Investigate partial payments, credit notes, returned payments and unapplied entries rather than marking an invoice as paid on submission alone.

Keep the invoice, PO or contract, approval record, payment confirmation and relevant correspondence together. A regular close review of open invoices, aged exceptions and unmatched payments helps the team resolve problems before they affect reporting or supplier relationships.

Controls that keep invoice-to-pay moving without weakening checks

The aim isn't to make every invoice follow the same manual path. It is to make straightforward invoices easy to progress while sending exceptions to the right person.

As a useful control benchmark, GOV.UK's commercial functional standard says supplier payments should be routinely approved by financial, commercial and operational staff to reflect governance, contractual arrangements and supplier performance.⁵ The standard applies to government bodies, but the underlying separation of roles is a practical principle for any business to adapt proportionately.

How can a UK business improve its invoice-to-pay process?

Start with one real invoice and map the hand-offs from receipt to reconciliation. Record each system, owner, approval, exception and delay. That shows whether the largest problem is intake, missing PO data, approvals, payment release or ledger clean-up.

According to GOV.UK's payment-practices reporting guidance, businesses in scope report the proportion of qualifying payments made in 30 days or fewer, 31 to 60 days, 61 days or longer, and outside agreed terms.⁶ Even where public reporting doesn't apply, the same measures can help a business locate delays in its own workflow.

How can Wise Business support the payment stage of invoice-to-pay?

Once an invoice has been validated, matched and approved, the final challenge is making the payment without losing the controls and records built earlier in the process.

Wise Business can support eligible UK businesses that settle approved international supplier invoices, while your business keeps control of supplier verification, invoice approval and payment authorisation.

You can use our batch payments tool to create and send multiple payments together, or use our accounting software connections to keep transaction data available for reconciliation. That gives the payment stage a clearer connection to the invoice and approval record that came before it.

Wise Business offers a free Essential plan for basic spending and transferring. If you need to receive money, set up direct debits, or generate invoices, you'll pay a one-time £50 setup fee to unlock the Advanced features.

With Wise Business, you can:

• 🌍 Send money to 70+ countries and pay overseas invoices at the mid-market exchange rate with low, transparent fees and no hidden exchange rate markups (product availability varies by region)
• 📥 Receive payments in 24 currencies and counting
• 💵 Get local account details for 8+ currencies, including USD and EUR, to let your customers pay in a currency they know and trust - convenience for them and peace of mind for you
• 💰 Hold money in 40+ currencies
• 🔁 Convert currencies anytime at the mid-market exchange rate with low, transparent fees
• ⚡ Use the batch payments tool to create and send up to 1,000 payments in a single transfer
• 👥 Run payroll and make international payments for up to 1,000 employees all over the world - including paying suppliers using local payment methods like ACH, SEPA, and Faster Payments
• 💳 Get business debit cards with 0.5% cashback for you and your team to keep track of team expenses and spend all over the world, with real-time visibility and categorisation. See full cashback terms and conditions
• 🏢 Manage cash in 55+ currencies across international offices from a single business account and move money between business accounts in seconds (exact speeds can vary depending on individual circumstances and may not be the same for all transactions)
• 🧾 Connect and sync every business transaction to your favourite accounting software, including Xero, Quickbooks, and more
• 🔐 Create your own payment approvals process to manage your team better with customised access for different team members, roles and permissions
• 📑 Create custom professional invoices and schedule invoice payments for future dates
• 📈 Earn variable returns on GBP, USD and EUR with Wise Interest (Growth not guaranteed. Your balance will go down in the event of a government default or interest rates going negative.)
• 🔗 Create payment links and QR codes to get paid easily (Card payment acceptance for new Wise Business customers is currently unavailable. Payment methods subject to eligibility and availability.)
• ⚙️ Automate payouts with the Wise API (comes with 24/7 customer support, a sandbox account to test integrations, API tokens, and clear documents on how to implement and make the most of our API)

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Wise Interest disclaimer: Growth not guaranteed. Your balance will go down in the event of a government default or interest rates going negative. Taxes may apply. 3.32% variable rate on GBP is based on 7 day performance as of 05 Aug 2026. For full 5-year past performance and fund information, visit https://wise.com/interest. Investments are offered by Wise Assets UK Ltd. (FRN 839689)

Wise services and features are not available in all regions, country and product restrictions apply. Visit wise.com to check availability, and for fee details and terms for your region, visit our pricing page for Wise Business..

FAQs

What is the difference between invoice-to-pay and procure-to-pay?

Invoice-to-pay starts when a supplier invoice arrives and ends when the payment is reconciled. Procure-to-pay starts earlier, with the business need, supplier selection, purchase order and receipt of goods or services. I2P should use the PO and receipt evidence created earlier in the wider P2P workflow.

Do all supplier invoices need a purchase order?

No. Some legitimate costs, such as utilities, rent or certain professional services, may follow a controlled non-PO route. The key is to define which spend is allowed without a PO, who approves it and what alternative evidence is required.

What should a business do when a supplier's bank details change?

Pause the payment and verify the change through an established, trusted contact route. According to the National Cyber Security Centre, a fraudulent request can impersonate a regular contact and direct payment to a different bank account.³ Update the supplier record only after the required verification and approval have been completed.

How long should invoice-to-pay take?

There isn't one correct cycle time. Measure the time from receipt to approval and from approval to payment, then set targets by invoice type, supplier terms and risk. A clean, matched invoice should move more quickly than a disputed, non-PO or high-value invoice.

What is e-invoicing?

According to GOV.UK, e-invoicing exchanges invoice information directly between buyers' and suppliers' financial systems and can write the invoice into the buyer's system without manual processing.¹ It doesn't remove the need for supplier, matching and approval controls.

Sources:

1. Promoting electronic invoicing across UK businesses and the public sector - GOV.UK
2. Record keeping (VAT Notice 700/21) - GOV.UK
3. Business payment fraud | National Cyber Security Centre
4. Late commercial payments: charging interest and debt recovery - GOV.UK
5. Government Functional Standard - GovS 008: Commercial - GOV.UK
6. Duty to report: guidance to reporting on payment practices and performance - GOV.UK

Sources last checked on 22nd September 2026