Accounts Payable Process: Invoice to Payment Steps

The accounts payable process is the sequence of steps a business follows to receive, check, approve, record and pay supplier invoices. A typical flow runs: set up the supplier, order, receive the goods, receive the invoice, match it, approve it, record it, then schedule and make payment. Done well, it ensures you pay only for what you ordered and received, on time, and once.

This guide walks through each step, shows the journal entries with a worked example from invoice to payment, and explains the controls that stop errors and fraud. For the receivables side of the same transactions, see our guide to accounts payable vs accounts receivable.

The AP workflow steps at a glance

Step	What happens	Key control
1. Supplier setup	Collect legal name, address, tax ID and bank details	Verify bank details independently
2. Purchase order	Agree what is being bought, at what price	Spending authority limits
3. Receipt	Confirm goods or services were delivered	Delivery note or sign-off by the requester
4. Invoice capture	Log the supplier invoice in one place	Single invoice inbox, duplicate check
5. Matching	Compare invoice to order and receipt	Two-way or three-way match with tolerances
6. Approval	Budget holder confirms the invoice is valid	Approval matrix by amount
7. Recording	Post the invoice to Accounts Payable	Correct coding and tax treatment
8. Payment	Pay in a scheduled run by the due date	Separate approval to release funds
9. Reconciliation	Match payments to bank and supplier statements	Monthly statement reconciliation

Step by step: how the accounts payable process works

1. Set up the supplier

Before the first payment, create a supplier record with the legal name, address, tax registration number where relevant, payment terms and bank details. Get bank details in writing on the supplier's letterhead or invoice, and confirm them by phone using a number you already hold, not one in the same email. Changes to bank details later should go through the same verification. Fraudsters frequently impersonate suppliers to redirect payments.

2. Raise a purchase order

For goods, larger services or anything above a set amount, raise a purchase order (PO) showing items, quantities, prices and delivery terms. The PO number gives both parties a reference. Smaller recurring costs, such as utilities or software subscriptions, usually skip this step.

3. Receive the goods or services

Whoever receives the delivery checks it against the PO and records what actually arrived, including shortages and damage. For services, the person who requested the work confirms it was completed.

4. Capture the invoice

Ask suppliers to send invoices to one dedicated email address or postal address, not to individual staff. Log each invoice on arrival with the supplier, invoice number, date, amount, due date and PO number. This is where duplicate checks belong.

5. Match the invoice

Compare the invoice against the PO (two-way match) or against the PO and the receipt (three-way match). Prices, quantities, tax and terms should agree within tolerances you set. Our three-way match guide covers tolerance rules and common exceptions.

6. Approve

The budget holder confirms the invoice is valid and correctly coded. An approval matrix sets who can approve what, for example team leads up to $2,000 and the owner above that. Our invoice approval workflow guide includes a template matrix.

7. Record the liability

Post the approved invoice to Accounts Payable with the correct expense, inventory or asset account. If the invoice relates to a future period, it may belong in prepayments; if the goods arrived before the invoice at month end, you may already hold an accrual to clear.

8. Schedule and make the payment

Pay in scheduled runs, such as weekly, picking each invoice up in the last run before its due date or its early-payment discount deadline. A second person, or the owner, releases the payment run after reviewing the list.

9. Reconcile

Reconcile supplier statements monthly to catch missing invoices, unapplied credits and duplicates, and reconcile the bank account so every payment is matched. The total of open items in the payables sub-ledger should equal the Accounts Payable balance in the general ledger.

Worked example: invoice to payment with journal entries

A small furniture maker orders 200 hardwood panels at $12 each from a timber supplier: PO total $2,400. Terms are 2/10 net 30 on the goods, with delivery charged separately. Sales tax is not charged because the panels are bought for resale in this example.

Receipt: 190 panels arrive; 10 are back-ordered.

Invoice: The supplier invoices 200 panels ($2,400) plus $60 delivery, total $2,460.

Match: The three-way match fails on quantity. The AP clerk contacts the supplier, who agrees to bill the 10 missing panels when they ship and issues a credit note for $120. The approved amount is now 190 x $12 = $2,280 plus $60 delivery = $2,340.

Recording the approved invoice (net of the credit note):

Account	Debit	Credit
Inventory, Raw Materials	$2,340.00
Accounts Payable, Timber Supplier		$2,340.00

Delivery is included in the inventory cost here because freight to bring materials in is usually treated as part of their cost; your accountant may prefer a separate freight-in account.

Payment within 10 days, taking the discount on the goods only: 2% x $2,280 = $45.60. Cash paid is $2,340 - $45.60 = $2,294.40.

Account	Debit	Credit
Accounts Payable, Timber Supplier	$2,340.00
Business Checking		$2,294.40
Purchase Discounts (or Inventory)		$45.60

The payable is cleared in full. Whether the discount reduces inventory cost or goes to a separate purchase discounts account depends on your accounting policy. The basic debit and credit logic is covered in our guide to journal entries.

Early-payment discounts: are they worth taking?

With terms of 2/10 net 30, skipping the discount means paying 2% more to hold the money for 20 extra days. Annualized:

(2 / 98) x (365 / 20) = about 37.2% a year

Terms	Extra days of credit	Approximate annualized cost of skipping
1/10 net 30	20	18.4%
2/10 net 30	20	37.2%
2/10 net 60	50	14.9%

If your borrowing cost or the return on spare cash is lower than these figures, taking the discount usually saves money, provided you can do so without squeezing cash needed elsewhere. Plan for it in your cash flow forecast.

The opposite risk is paying late. Missing due dates can mean late fees written into the supplier's terms, a damaged relationship and, in some countries, a statutory right for the supplier to charge interest on late commercial payments (the UK has such a law, for example). A reliable payment schedule protects your credit standing with suppliers as much as it protects your cash.

Controls that protect the accounts payable process

• Segregation of duties. The person who sets up suppliers should not be the person who releases payments. In a tiny business, the owner approving every payment run is often enough.
• Bank detail verification. Call back on a known number for every new supplier and every change request.
• Duplicate detection. Check supplier, invoice number, date and amount; be wary of reminders or statements being paid as if they were invoices.
• Pay from invoices only. Never pay from a statement or an email that just names an amount.
• Locked supplier master data. Limit who can edit supplier records and keep a log of changes.
• Month-end cut-off. Accrue for goods and services received but not yet invoiced so the period's costs are complete.

Who does what in the accounts payable process

Segregation of duties is easier to apply when roles are written down. Here is a simple responsibility map for a business with an owner, a bookkeeper and a couple of team members who buy things:

Task	Team member	Bookkeeper	Owner
Request purchase and raise PO	Does	Checks PO number sequence	Approves above limit
Confirm delivery	Does
Log and match invoice		Does
Approve invoice	Confirms work done		Approves above limit
Add or change supplier bank details		Prepares	Verifies by phone and approves
Prepare payment run		Does
Release payment			Does
Reconcile statements and bank		Does	Reviews monthly

The point is that no single person can both create a supplier and pay it, or both approve an invoice and release the money. If you work alone, you cannot split duties, but you can still slow down: never pay a new supplier or changed bank details on the same day you receive the request.

Month-end close for payables

At month end, the accounts payable process feeds directly into your financial statements, so a short routine keeps the numbers complete:

1. Log every invoice received up to the last day of the month, even if it is not yet approved.
2. Accrue for goods and services received but not yet invoiced. Our guide to accrued expenses shows the entries.
3. Move advance payments to prepayments where an invoice covers future months; see prepaid expenses.
4. Run the aged payables report and compare its total with the Accounts Payable balance in the ledger.
5. Reconcile key supplier statements and chase missing credit notes.
6. Reconcile the bank so every supplier payment is matched; our bank reconciliation guide explains how.

These steps slot into a wider month-end close checklist. A tidy payables close also gives you an accurate view of what cash is committed for the next few weeks.

Small business vs larger business AP

Area	Small business (owner plus bookkeeper)	Larger business
Purchase orders	Only for stock and large purchases	Required above a low threshold
Matching	Two-way, or eyeballing delivery notes	Systematic three-way matching with tolerances
Approval	Owner approves the weekly payment list	Multi-level approval matrix in software
Payment	Online banking batch, owner releases	Payment files with dual authorization
Reporting	Aged payables report monthly	KPI dashboard and supplier scorecards

Whatever the size, the accounts payable process has the same purpose: pay the right amount, to the right supplier, at the right time. As volume grows, it is worth measuring how well it does that. Our accounts payable KPIs guide explains metrics such as cost per invoice, days payable outstanding and exception rate.

Common mistakes

• Invoices scattered across inboxes, so some are paid late and some are never recorded.
• Paying on receipt instead of on the due date, which gives away free credit.
• Missing early-payment discounts because approval takes longer than the discount window.
• Changing supplier bank details on email instruction alone.
• Not reconciling supplier statements, which hides missing credits and duplicate payments.

For suppliers: invoices that move through AP fast

If you are the one sending invoices, the customer's accounts payable process decides when you get paid. Quote their PO number, use a unique invoice number, match the PO prices and quantities exactly, state your payment terms and bank details, and send it to their invoice address rather than your contact. Our free invoice generator includes a PO number field, notes and terms, and lets you download a clean PDF you can send to the customer's accounts team.