Purchase order approval process shown as a before and after split: on the left an overflowing inbox tray of paper purchase requests with sticky notes reading Who approves this, Still waiting, Missing quote and Approved in chat; on the right an aerial road interchange where request cars are routed by signs for Under limit to Manager, Over limit to Finance and Owner, and IT gear to IT review, merging at a PO released toll gate beside an Accounting building, with a reminder card showing Day 2 escalate and backup approver set

A purchase order approval process is the path a spending request takes from "we need this" to an approved purchase order a vendor can act on. In most small and mid-sized companies it breaks in the same few places: requests arrive by email or chat with half the details missing, nobody is sure who is allowed to approve which amount, approvals sit in one manager's inbox while the person who asked keeps chasing, and the approved request never cleanly becomes a PO in the accounting system. The fix is not a new purchasing suite or another person to chase signatures. It is one request record, written approval rules that route each request automatically by amount and category, reminders and backups that run on their own, and a clean handoff into the accounting or ERP tool you already use.

Below: what a working purchase order approval process looks like, why it slows down as a company grows, why the usual fixes only solve part of it, and how to fix it on the tools your team already runs.

What does a good purchase order approval process look like?

Strip away the software names and a healthy process has six steps, each with a clear owner and a clear finish line.

Request. The person who needs something fills in one short form: what, why, which vendor, estimated cost, which job, department or budget line, and when it is needed. No free-text email that someone has to decode later.
Check. Before anyone approves, the request is checked for missing details, a known vendor, and whether the budget line has room. Incomplete requests go back to the requester right away instead of stalling at the approver.
Route. The request goes to the right approver based on written rules: amount, department, category (IT equipment, contractors, software subscriptions) and risk. Larger amounts add a second approver, such as finance or an owner.
Decide. The approver sees everything needed to decide on one screen and approves, rejects or sends it back with a question. The decision, the time and the reason are recorded.
Release. An approved request becomes a purchase order in the accounting or ERP system with the same vendor, amounts and coding, without anyone retyping it. Our guide to the purchase approval to PO release workflow covers this handoff in detail.
Close. When the goods or services arrive and the invoice comes in, it can be matched back to the approved PO, so accounts payable is not approving the same spend twice.

The front half of that chain, from request to decision, is where most of the waiting happens. The request to purchase approval workflow guide breaks down what each stage needs.

Why do purchase approvals slow down as you grow?

When a company has ten people, the owner approves everything in a hallway conversation and it works. By fifty or a hundred people, the same habits start to hurt:

The rules live in people's heads. There may be a policy document that says managers can approve up to a certain amount, but routing still happens by whoever the requester decides to email. Some people approve outside their authority without realizing it.
Requests arrive incomplete. The approver has to reply asking for the quote, the budget line or the reason. Each round trip adds a day.
One inbox becomes the bottleneck. When the approver travels or goes on vacation there is no backup, so requests pile up or someone approves informally in chat.
Nobody can see status. The requester does not know whether the request is waiting, rejected or approved. They follow up by email, then in chat, then in person, which adds noise for everyone.
The PO is created by hand. Someone rekeys the approved request into accounting. Amounts, vendors and coding drift, and the audit trail splits between an email thread and the ledger.
Spend gets split or skipped. When the process is slow, people buy on a company card, split a purchase to stay under a limit, or order first and ask later. The process meant to control spend ends up hiding it.

The pain shows up as delay, but the cost is bigger: projects wait on materials, vendors wait on POs, finance loses sight of committed spend until the invoice arrives, and good people spend part of every week chasing signatures. Our piece on why approval workflows stall in growing teams walks through the pattern in more depth.

Why don't the usual fixes work?

Most companies try one of these first. Each solves part of the problem.

Hiring a purchasing coordinator

A coordinator can chase approvals, but they become the new inbox. The rules still are not written into anything, so when that person is out, the process stops. You have paid to make the chasing faster, not to remove it.

A shared spreadsheet or a form tool

A request form feeding a spreadsheet fixes the "missing details" problem. It does not route by amount, send reminders, handle backups, or create the PO. Within a few months the sheet has status columns nobody trusts. We compare the trade-offs in spreadsheet operations vs custom software.

The approval feature in your accounting tool

Many accounting and ERP systems include a basic approval step, and it is worth turning on. For example, Microsoft's documentation for Business Central describes setting up approval users with amount approval limits and substitute approvers, and warns that the same user should not be both a requestor and an approver in a workflow user group. Built-in features like this are often limited to people who have a license for that system, so the field supervisor or department head who actually needs to request or approve may not be in it. Rules beyond amount, such as category, project or vendor risk, are often hard to express.

Another purchasing portal

A full procurement suite can work for large companies, but for a growing business it often means another login for every requester, a long setup, and a second vendor list that drifts from the one in accounting. If people avoid the portal, you are back to email with an extra system on top.

What a real fix looks like

The fix is to put the approval rules your company already has into software that sits on top of the tools you already run. Nobody has to give up accounting, email or chat. The pieces:

One request record. A short request form that captures what approvers and accounting need, with required fields and attachments (quote, contract, spec). Every comment, decision and change lives on that record.
Written routing rules. An approval matrix by amount, department, category and project, so the right approver is picked automatically. The approval matrix software requirements guide lists what to decide before building it.
Reminders, escalation and backups. If an approver has not acted, a reminder goes out; after a set time it escalates or goes to a named substitute. No more requests parked in a vacation inbox.
Approve where people already work. Approvers can act from an email or chat notification with the key details visible, instead of logging into one more portal.
Budget context. The approver sees what has been spent and committed against the budget line before deciding. If budget changes need their own sign-off, a budget approval workflow can share the same rules.
Clean PO creation. Approved requests create the purchase order in your accounting or ERP system through its API, with the same vendor, amounts and coding. See approval workflow to ERP integration for how to decide which system owns which record.
Status anyone can check. Requesters see where their request is and who has it. Finance sees committed spend and what is waiting, by approver and by age.

This is the kind of system described on our purchase order approval software page, and it is built through our approval workflow automation service. The point is not to add a tool. It is to make the rules you already have run on their own.

Where does AI fit?

In narrow, checkable roles: reading an attached quote to pre-fill the vendor and amount for the requester to confirm, or flagging a request that looks like a duplicate of one approved last week. It should not approve spend on its own, and it does not replace your accounting system or your approvers.

What you can do this week

Write down the real rules. Who can approve what, up to which amount, for which departments and categories. Note where people disagree; those are the gaps causing confusion.
Pull the last month of requests. Count how many arrived incomplete, how long each waited, and where they waited. The longest waits usually point at one or two approvers or one missing field.
Fix the request form first. Make the fields approvers keep asking for required. This alone removes a round trip on many requests.
Name a backup for every approver. Even before any software, this stops the vacation pile-up.
Check the handoff to accounting. Compare a few approved requests with the POs that were created. If vendors, amounts or coding differ, the release step needs to be connected, not retyped.

If you are moving off email approvals entirely, the email approvals to approval workflow software guide shows how to switch without stopping purchasing for a week, and the workflow automation readiness checklist helps you decide whether the process is ready to automate.

What do teams ask about the purchase order approval process?

Do we need a PO for every purchase? Usually not. Many companies skip POs for small or recurring spend and require them above an amount or for certain categories. Write that threshold down so people are not guessing.

How many approvers should a request have? As few as your controls allow. One approver for routine spend within budget, a second for larger amounts or unusual categories. Every extra step adds waiting time, so each one should have a reason.

Should the requester ever approve their own purchase? As a rule, no. Separating who asks from who approves is a basic control, and good routing rules enforce it automatically.

How is this different from AP approval? PO approval happens before you commit to spend; AP approval happens when the invoice arrives. They should connect, so an invoice matched to an approved PO does not need to be approved again. Our post on when AP approvals should stop living in email threads covers the invoice side.

Will we have to replace our accounting system? No. A good approval layer works with the accounting or ERP system you already have and writes approved purchases into it.

A purchase order approval process gets faster when every request has one record, the routing rules run on their own, and approved requests flow straight into accounting. If you want help building that on top of the tools you already run, Pro Logica focuses on custom software development that connects your existing systems instead of replacing them. book a call

What should you read next if this issue sounds familiar?

If this topic matches what your team is dealing with, these pages are the best next step on the Pro Logica site.

Purchase Order Approval Software for a closely related next read.
Field Service Management System Development for delivery context.
Work Order Management Software for a closely related next read.

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