AP teams shouldn’t have to spend their day chasing invoice approvals. But in many UK businesses, that’s precisely what happens.
Invoices arrive by email, get saved into folders, then bounce around in threads until someone has time to respond. It only takes one missing cost centre or unclear approval chain to hold everything up.
A structured invoice approval process takes the pressure off UK AP teams. It captures invoices as they arrive, validates the data, and automatically routes them to approvers using predefined rules and service-level agreements (SLAs).
Approvers can review and sign off on invoices remotely using mobile or digital signatures, and escalate exceptions so invoices don’t sit in limbo. Once signed off, approved invoices are posted to enterprise resource planning (ERP) software with a complete audit trail.
In this guide, we’ll break down what a structured invoice approval workflow looks like, how automation compares to email-based approvals, and the key controls and metrics that help UK AP teams keep invoices moving.
An invoice approval workflow (also known as an invoice approval process) is the repeatable procedure for reviewing and authorising supplier invoices before they are posted and paid.
It ensures every invoice is legitimate, accurate, correctly coded, and compliant with company policy before funds leave the business. In UK accounts payable (AP) teams, it also supports the consistent handling of VAT, supplier master data checks, and proper authorisation based on spend thresholds.
For most organisations, invoice approval procedures sit between invoice receipt and payment execution. Workflow may vary by business size and sector, but the goal stays the same: to establish a standardised, policy-driven process for vendor invoice approval that minimises delays and prevents avoidable errors.
Before UK AP teams can improve billing approval performance, it helps to map the moving parts. Most invoice delays can be traced back to one of three things: missing artefacts, unclear ownership, or disconnected systems.
The invoice approval process usually relies on a set of related documents and data points, including:
In most UK SMEs and mid-market firms, invoice approvals aren’t handled by one person. Instead, they’re spread across the finance team and the wider business. The people typically involved in invoice approval may include:
When roles aren’t defined clearly, invoices may bounce between teams or sit untouched while AP personnel try to identify the correct approver.
Even in lean finance teams, invoice handling usually spans several systems:
Most teams don’t choose a manual invoice approval process; they inherit it. Email approvals, spreadsheet trackers, and shared folders can work at low volume, but cracks begin to show as operations scale.
Here’s how manual and automated approaches to invoice approval compare:
|
Aspect |
Manual (email/Excel) |
Automated (Solution like DocuWare) |
|---|---|---|
|
Routing |
Ad-hoc CCs, unclear owners |
Rules, thresholds, SLAs, escalations |
|
Visibility |
“Where is it?” |
Dashboards & status tracking |
|
Speed |
Chasing approvers |
Reminders, mobile & e-/digital signatures |
|
Risk |
Missed duplicates/fraud |
Validation, duplicate checks, and audit trail |
Automated billing approval reduces the need for chasing and back-and-forth communication. Instead of relying on individual knowledge (e.g. “send it to Sarah for sign-off”), the workflow applies consistent rules and records to each approval.
A high-performing invoice approval workflow follows a consistent sequence from intake to payment readiness. The steps below are typical in UK businesses and align well with how finance teams manage supplier risk, VAT, and delegated spend authority.
The process starts as invoices arrive via email inboxes, PDF attachments, scanned paper or EDI feeds. This is the stage where many invoice approval procedures break down in manual systems, as data entry is slow, fields are missing, and errors creep in.
At this first step, an automated solution can:
Learn more about invoice data capture.
Once the invoice is validated, it must be routed to the correct approver(s). Routing is also where many teams apply controls to ensure vendor invoice approval follows segregation of duties (SoD) requirements.
In an automated billing approval model, consistent rules can be created based on:
A strong invoice approval workflow will also include:
For finance teams under pressure, faster invoice approval is only valuable if control remains intact. The approval experience must support both speed and accountability.
Approvers need sufficient context to green-light invoices quickly and confidently. At a minimum, they should be able to review:
E-/digital signatures can be included in the approval process if an organisation’s controls require explicit confirmation, or if there is an internal audit preference for signed authorisation.
Choosing an invoice approval system with mobile access and one-click actions also means approvers can progress invoices without waiting to return to a laptop or office.
Once approved, the invoice can be posted to your ERP and queued for payment processing. A connected invoice approval workflow can:
Integrated document storage reduces manual rekeying and ensures that a posted invoice remains traceable back to its original documents and approvals.
Invoice approval is one step in the wider invoice-to-pay process. It works best when approvals connect cleanly to the controls that precede them and to the checks that occur after payment.
When these steps align properly, fewer invoices are held as exceptions, and your AP team has better visibility from receipt through to payment.
To keep invoice approval on track, teams need to be able to see and report on where invoices are getting stuck, how long approvals take, and how often rework is happening.
Here are some useful metrics to track:
These metrics show how well the workflow is performing, but the process still needs controls to keep invoice approvals consistent. Common controls include:
Remote working is now routine for many UK organisations, and hybrid roles are common across finance, procurement and operational teams. According to industry research, more than half (53%) of UK accountancy and finance professionals currently have a hybrid working setup.
To keep SLAs intact, approvals need to be easy to complete wherever approvers are working, using tools such as:
UK case study snapshot: Owens Group & Glenkeir Whiskies
Across the UK, AP teams are using workflow automation to speed up invoice approvals, reduce paper handling, and strengthen traceability from receipt through to posting.
The company wanted to make purchase approvals and invoice handling easier to track, with stronger control and traceability across the process.
Owens Group introduced a customised digital purchase order form and automated approval routing. Requests are now sent to the relevant authorised approvers, who can accept or reject digitally (returning a rejection with a reason). Incoming invoices are captured digitally, indexed and linked to related order documentation.
Invoice data is then transferred into Sage 200, reducing manual entry and speeding up processing for the finance team.
By connecting invoice capture and approvals into a structured workflow, Owens Group can see invoice status, who has approved them, and when — improving visibility for both purchasing and finance.
Read the full Owens Group UK case study.
During peak periods, the accounts team would match invoices line by line against goods received notes, then manually enter invoice data into their accounting package. With multiple documents linked to the same purchase, this created delays, added admin workload, and increased the risk of errors.
With DocuWare Cloud and a Sage 200 integration, Glenkeir digitised purchase orders and stored GRNs, enabling its accounts team to access supporting documents in one place. DocuWare also automated the processing of emailed invoices and matched them to GRNs using key data points, removing manual verification.
Invoice approvals now run through an electronic workflow, supporting remote working and speeding up sign-off. Glenkeir’s finance team have reported significant time savings, improved accuracy and cost reductions.
Read the full Glenkeir Whiskies case study.
Start streamlining your invoice approval workflow today with DocuWare’s secure, rules-driven platform.
Capture the invoice (email/PDF/EDI) and extract key fields, then validate supplier/master data and link the document to its PO or contract; for non-PO invoices, enforce coding to cost centre/project. Check totals, VAT, currency, and due date; run duplicate/fraud checks (e.g., vendor, number, amount); and only then route via the approval matrix.
The invoice is routed to the correct approvers based on thresholds, category, and cost centre, with SLAs, reminders, and escalation. Approvers review coding and any variances, approve (often via mobile/e-/digital signature), after which AP posts to the ERP, queues for payment and archives the audit trail.
It verifies that the purchase order (PO), goods receipt note (GRN) and supplier invoice agree on quantities, prices and taxes within defined tolerances. If they match, the invoice moves straight through; if not, it’s raised as an exception (e.g., variance, partial receipt) for resolution before approval.
By enforcing required fields (cost centre, budget, contract reference), applying stricter thresholds and adding the relevant business owner/budget holder before AP posts the invoice.
The workflow reads budget and cost-centre data, applies the right approval path, and auto-escalates if approvals would exceed available funds.
Master data is used for validation; approved invoices (with coding/VAT) are written back to the ERP, and links to the archived document support audit trails.