The accounts payable (AP) business process is the set of procedures through which an entity receives an invoice, undertakes a series of checks and balances, and ultimately pays and records the invoice. In other words, it is a business process that comprises several safeguards that ensure an organization does not pay the same invoice more than once or for goods that the entity does not receive.
Most small businesses do not have a well-defined business process for their accounts payable needs. They usually have an individual responsible for opening the mail, another person to file, and a general sense of what is due at any time.
However, this works until a particular point (typically when a business receives around thirty invoices on a monthly basis) at which moment the first phone call from a supplier about a supposedly unpaid invoice occurs, or a forgotten invoice comes due.
The three-way match is where errors get caught, but the place they get created is invoice coding; someone assigns the wrong GL account or the wrong period, and nothing in the payment run flags it because the money still goes to the right supplier. You find it at year end, when the expense sits in the wrong month and the comparative numbers you've been making decisions on all year turn out to be wrong.
Ankit Sagatani, MBA, B.Com · LinkedInThis article provides information on how an entity can design the accounts payable process from receiving invoices to paying them, including some of the controls and metrics that should be put in place to ensure effectiveness and areas that commonly cause issues.
What Is the Accounts Payable Cycle?
The accounts payable (AP) process is the internal system a business uses to manage, verify, and pay its supplier invoices. A well-designed AP cycle ensures vendors are paid accurately and on time, cash flow is managed strategically, and the business maintains clean audit-ready records.
The AP cycle is the end-to-end process from the moment a purchase order is raised to the moment the supplier invoice is paid and recorded in the general ledger. In a manual process, this typically takes 15 or more days per invoice. In an automated AP environment, the same cycle can be completed in 3-7 days with fewer errors and no manual data entry.
| Metric | Manual Process | Automated Process |
|---|---|---|
| Average processing time per invoice | 15+ days | 3 to 7 days |
| Cost per invoice | $12 to $30 | $2 to $8 |
| Error rate | 3 to 5% | <1% |
| Supplier disputes | Frequent | Rare |
Step-by-Step Breakdown of the Accounts Payable Process
| Step | Description | Who Does It |
|---|---|---|
| 1. Purchase requisition | Department requests a product/service, internal approval obtained | Requesting department |
| 2. Purchase order (PO) issued | Finance/procurement issues a formal PO to the supplier with agreed quantity, price, terms | Finance / procurement |
| 3. Goods/services received | Delivery is received; a goods receipt note (GRN) is created to confirm what was received | Warehouse / operations |
| 4. Invoice received | Supplier sends invoice for payment, paper, email, or e-invoice portal | AP team |
| 5. Invoice capture & coding | Invoice data is extracted (manually or via OCR/AI) and GL codes assigned | AP team / automation |
| 6. Three-way match | PO + GRN + invoice are compared, quantity, price, and terms must align before payment is approved | AP team / system |
| 7. Invoice approval | Invoice routes to appropriate approver(s) based on amount and department | Manager / department head |
| 8. Payment scheduling | Approved invoice is scheduled for payment on or before the due date | AP team / finance |
| 9. Payment execution | Payment is made via ACH, wire, cheque, or card | Finance |
| 10. Reconciliation & posting | Payment is posted to the AP sub-ledger and reconciled with the bank statement | AP / accounting |
Importance of a Streamlined Accounts Payable Cycle
- Cash flow control: knowing exactly when invoices are due and scheduling payments strategically (capturing early payment discounts vs preserving cash) directly impacts working capital
- Supplier relationships: consistent, accurate, on-time payment builds supplier trust, critical for preferential pricing, priority fulfilment, and extended credit terms
- Fraud prevention: a three-way match process and proper approval controls are the primary defences against duplicate payments, fictitious invoices, and AP fraud
- Audit readiness: every invoice, approval, and payment creates a documented audit trail, essential for financial statement audits and tax compliance
Best Practices for 2026
- Move to e-invoicing where your suppliers support it: Electronic invoices arriving through a portal or AP platform skip data entry entirely, and straight-through transactions can process inside a day. The limiting factor is usually your suppliers, not your software.
- Enforce the match, but match the right way. Three-way for goods. Two-way plus receipt confirmation for services. This one control catches more duplicate and fraudulent payments than everything else combined.
- Clean the vendor master before you automate anything. One record per supplier, unique IDs, no duplicates. Automating on top of a vendor list with the same company entered four different ways just produces errors faster. This is the step most businesses skip and most regret.
- Standardise payment terms. Net 30 or Net 45 across the board makes forecasting possible. A ledger where every supplier has different terms can't be forecast at all without opening each invoice.
- Do the maths on early payment discounts. Terms of 2/10 Net 30 work out to roughly a 37% annualised return on paying 20 days early better than almost anywhere else you could put that cash. Take them when you have the working capital. When you don't, don't pretend you do.
- Separate approval from payment. Whoever approves an invoice should not be the person who releases the funds. In a business too small to split those roles, the owner reviews the payment run before it goes out. That's the minimum.
- Verify bank detail changes by phone. Any email asking you to update a supplier's bank details gets confirmed on a number you already had, not the one in the email. This is the most common six-figure loss in small business AP and it costs one phone call to prevent.
Key AP Metrics to Track
| Metric | How to Calculate | Benchmark |
|---|---|---|
| Days Payable Outstanding (DPO) | AP balance / (COGS / 365) | 30 to 60 days (varies by industry) |
| Invoice processing time | Days from invoice receipt to payment | <7 days (automated); <15 days (manual) |
| Cost per invoice | Total AP cost / number of invoices processed | <$5 (automated); $12 to $30 (manual) |
| Invoice exception rate | Invoices requiring manual intervention / total invoices | <5% (well-run AP) |
| Duplicate payment rate | Duplicate payments / total payments | <0.1% |
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Frequently Asked Questions
What is the difference between accounts payable and accounts receivable?
Accounts payable is money your business owes suppliers: a liability on the balance sheet. Accounts receivable is money customers owe you, an asset. They're managed in opposite directions: AR you want collected as fast as possible, AP you want paid on time but not early, unless there's a discount that makes early payment worth more than holding the cash.
What is a three-way match in accounts payable?
It compares three documents before an invoice gets approved: the purchase order showing what was ordered, the goods receipt note showing what arrived, and the supplier invoice showing what you're being charged. All three have to agree on quantity, price and terms. Anything that doesn't match gets held and resolved before payment. For services, where there's no physical receipt, you use a two-way match against the PO or contract plus confirmation from whoever received the work.
How do I reduce duplicate payments?
Start with the vendor master: one record per supplier, unique IDs, and no near-duplicate entries, because most duplicate payments trace back to the same supplier existing twice in the system. Then enforce matching, use AP software with duplicate detection on invoice number and amount, and reconcile the AP sub-ledger against supplier statements monthly. That last one catches what the software misses.
How long should the accounts payable process take?
Under seven days from invoice receipt to payment approval is a reasonable target with automation; under fifteen if you're processing manually. What matters more than the average is the exception rate, if more than one invoice in twenty needs someone to intervene, the problem is upstream in your PO or vendor data, and speeding up the back end won't fix it.
Should a small business outsource accounts payable?
It's worth considering once invoice volume is high enough that AP is taking up meaningful time from someone whose actual job is something else, or when you can't segregate approval from payment internally because there aren't enough people. Outsourcing gives you the control structure and the documentation without hiring for it. The tradeoff is that it only works if you're disciplined about telling your provider when vendor details or approval authority change, the process is only as current as the information going into it.
Written by
Ankit Sagatani, MBA, B.Com
Ankit works with business owners across the US on industry-specific bookkeeping, from real estate to construction and retail. He writes about what each trade's books actually need. Connect on LinkedIn Connect on LinkedIn
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