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Late payments are rarely caused by a finance team that does not care about suppliers. They are usually caused by an approval process that moves too slowly. The invoice arrives. It sits in a queue. The budget holder is travelling. Nobody chases them. The payment terms expire.
A well-designed invoice approval workflow removes these delays without removing the controls that make approval meaningful. This guide covers how to structure an AP approval process, what causes it to break down in practice, and how automation changes the experience for both the finance team and the people doing the approving.
An invoice approval workflow is the structured process by which an invoice moves from receipt to authorised payment. It defines who needs to approve an invoice, under what conditions, and in what sequence.
At its simplest, a one-person business approves every invoice itself. At the other end of the scale, a multi-entity business with complex purchasing authority might require sign-off from the budget holder, their line manager, and the CFO for invoices above a certain value.
The purpose of the approval workflow is to confirm that:
When the workflow works well, it is nearly invisible. Invoices move through quickly, payments go out on time, and there is a clean audit trail. When it does not work well, it consumes a significant portion of the AP team's time chasing approvals that should not require chasing.
The gap between how an approval process is designed and how it actually operates is almost always larger than finance teams realise.
In most mid-market businesses, the invoice approval process runs through email. The AP manager forwards an invoice to the relevant budget holder. The budget holder replies to approve. Sometimes they reply with a question. Sometimes they do not reply at all.
There is no central record of what is pending. There is no automatic escalation when an approver does not respond. The AP manager has to track every outstanding approval manually and chase each one individually. As invoice volume grows, this becomes unsustainable.
A budget holder receives an invoice PDF and an email asking them to approve it. They do not see the original purchase order it was raised against. They do not know whether similar invoices from this supplier have been approved before, or whether the amount is within the agreed rate.
When approvers do not have the context they need to make a confident decision, they either delay (waiting until they can check the details) or they approve without checking (which defeats the purpose of the control).
Many businesses operate with informal approval rules that exist in the AP manager's head rather than in any written policy. Who approves what is based on historical practice rather than a defined matrix. When the AP manager leaves or the team grows, the rules become inconsistent and decisions become unpredictable.
Finance leaders often have no real-time view of how many invoices are pending approval, how long they have been waiting, or which approvers are the bottleneck. The picture only exists in the AP manager's tracking spreadsheet, and it is only as current as the last time they updated it.
A well-structured approval workflow is built around three decisions: who approves, under what conditions, and what happens when they do not respond.
The approval matrix sets out the rules for who approves which invoices. A basic matrix might look like this:
The specific thresholds depend on the business. The important thing is that the rules are written down, applied consistently, and reviewed periodically as the business changes.
Amount is the most common approval trigger, but it should not be the only one. A well-designed invoice approval process also routes by:
Every approval step needs a defined escalation path. If the primary approver does not respond within a configured window, the invoice escalates to their manager or a designated deputy. If that escalation is also not acted on, the AP manager receives a notification.
This removes the dependency on someone remembering to chase. The escalation happens automatically, with a full record of when each reminder was sent and when escalation was triggered.
Approval delays are often not caused by approvers being obstructive. They are caused by approvers having to log into a system they do not use regularly, find the invoice, understand the context, and take action. For non-finance approvers who handle a handful of approvals a month, this friction is real.
A well-designed automated invoice approval process lets approvers act by email or mobile with one click: approve, reject, or query. They do not need to log into the AP system. The full context is attached to the notification: the invoice, the matched PO, the supplier history, and the specific reason the invoice is in front of them.
Automating the approval workflow does not change the underlying logic. The same rules still apply. What it removes is the manual work of managing the process.
Reminders go out automatically at configured intervals. Escalations happen without anyone triggering them. The AP team can see the full status of every pending approval in one view without maintaining a tracking spreadsheet.
Every approval action is logged: who approved, when, from which device, what they were shown at the point of approval. This is the record that auditors ask for, and it exists automatically rather than needing to be reconstructed from email threads.
When approvers receive notifications with full context and can act in one click, the average time from invoice receipt to approval approval drops significantly. For invoices that match their PO and pass automated validation, some businesses configure straight-through processing for low-value invoices with approved suppliers, removing the human approval step entirely for routine transactions.
Real-time dashboards show what is in the approval queue, how long each invoice has been waiting, and which approvers or cost centres are generating the most delays. Finance leaders can address bottlenecks before they affect payment runs rather than after supplier relationships have been strained.
Setting low approval thresholds creates high approval volume. Every approver in the business is handling invoices regularly, and the approval itself becomes a rubber-stamp exercise rather than a genuine control. This increases the risk that approvers stop reading what they are approving.
Match the threshold to the risk. Low-value invoices from approved suppliers with matched POs do not need manual approval. Focus human review on the transactions where it adds value.
An approval matrix configured when the business had 50 employees may not be appropriate at 200 employees. New departments, new entities, new cost centres, and changes in authority create gaps and inconsistencies over time. Build a review of the approval matrix into the annual finance controls review.
Many approval workflow implementations focus on PO invoices and treat non-PO invoices (expenses, subscriptions, one-off professional services) as a separate problem. This creates two parallel processes, each with their own approval logic and audit trail. A well-designed workflow handles both in the same system with appropriate rules for each category.
Dost configures approval workflows based on the rules finance teams define: amount, supplier type, cost centre, entity, or any combination. Approvers receive notifications by email with the full context attached and can approve, reject, or query in one action without logging into a specialist system.
Reminders and escalations run automatically. Every action is logged with a full timestamp and approver identity. The AP team has a real-time view of every invoice in the approval queue without a manual tracking step.
Dost integrates in real time with SAP, Microsoft Business Central, Sage (200, Intacct, X3), and Oracle. Approved invoices flow directly into payment runs without re-entry.
See what a streamlined approval workflow could save your team at month-end. Use Dost's ROI calculator to calculate based on your invoice volume and current process.
Each entity can have its own approval matrix with its own thresholds, signatories, and escalation paths. An invoice raised against Entity A routes to Entity A's budget holder. An invoice above Entity B's threshold requires Entity B's CFO sign-off. The rules are configured separately per entity but managed in the same system, so the finance team has a single view across all entities without managing separate processes.
Yes. Modern AP approval systems send notifications by email or mobile and allow approvers to act with one click, without logging into the AP platform. The approval is logged with the approver's identity and the time of action regardless of where they are. This is particularly important for businesses where budget holders travel regularly, since it removes the need for delegated approval just because someone is out of the office.
Rejected invoices return to the AP team with the reason for rejection attached. The team can contact the supplier, query the invoice, request a credit note, or escalate the rejection for further review. A complete rejection history is maintained on the invoice record so anyone picking it up later has full context on what has already happened.
The invoice approval workflow is one of the most direct levers a finance team has on payment timing and supplier relationships. A well-designed workflow with clear rules, automated reminders, and a simple approver experience removes the most common causes of payment delay without weakening the controls that approval exists to provide.
The businesses that get this right treat it as a process design question before they treat it as a technology question. Who approves what, under what conditions, and what happens when they do not respond: these decisions precede the choice of system. When the process logic is clear, the automation handles the rest.
Calculate what a streamlined AP approval process could save your team with Dost's ROI calculator.
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