Learn · Accounts payable
What are accounts payable? AP basics and why they matter for cash flow
Learn accounts payable basics, why AP affects cash flow, how 2/10 net 30 works, and the correct AP turnover formula with a worked example.
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In short
What are accounts payable?
Accounts payable, or AP, is money a business owes vendors for goods or services bought on credit. It is normally a balance-sheet liability until the obligation is settled. Managing AP means validating invoices, matching them to authorization and receipt, recording the correct liability, choosing the payment date within agreed terms, releasing payment safely, and reconciling the ledger.
Why accounts payable is a liability
The SEC defines accounts payable as amounts an entity owes vendors for goods or services purchased on credit. The balance sheet reports what a company owns and owes at a point in time, so an unpaid supplier invoice appears on the liability side. Paying it reduces both the payable and cash; the payment itself does not create a second purchase expense.
AP, accrued expense, debt, and cash payment are not interchangeable
| Feature | Accounts payableVendor credit | Accrued expenseCost incurred, invoice absent | BorrowingFinancing obligation | Cash paymentSettlement event |
|---|---|---|---|---|
| Origin | Goods or services bought on supplier terms | Expense incurred before final billing | Loan, note, or financing contract | Approved instruction settles an obligation |
| Primary evidence | Invoice, order, receipt, contract | Estimate, usage, payroll, service period | Financing agreement and schedule | Bank or rail settlement record |
| Finance question | What is owed to this supplier? | What cost belongs in this period? | What principal and financing cost are due? | Which liability did this cash clear? |
The correct classification depends on the accounting framework and facts. The SEC describes liabilities broadly as amounts or obligations a company owes to others.
An invoice should not create an unquestioned liability merely because it reached the inbox. FAR 32.905, in its federal-contract context, bases payment on a proper invoice and satisfactory performance and requires receiving or other authorization documentation. A growing company should preserve the same logical chain even if its exact documents are simpler.
The AP lifecycle
A payable is controlled from purchase authorization through bank reconciliation.
Authorize the purchase
Identify the legal buyer, budget, supplier, scope, price, currency, terms, and approver before commitment. Use a purchase order when the process requires one.
Record receipt or performance
Capture what was delivered, how much was accepted, when it arrived, and who confirmed it. For services, define the milestone, timesheet, usage, or deliverable that supports acceptance.
Validate and match the invoice
Check seller and buyer identity, invoice number, date, order reference, description, quantity, price, tax, currency, terms, and total. Compare the invoice to the order and receipt where applicable.
Approve and post
Resolve exceptions, document authority, and code the liability to the correct entity, supplier, account, department, project, tax, date, currency, and due date.
Build the payment proposal
Group approved obligations by due date, discount opportunity, payment rail, funding currency, and cash forecast. Do not alter supplier master data inside the proposal.
Release and settle
Apply payment authority and segregation appropriate to the team. Record the bank or rail reference and investigate returns, deductions, intermediary fees, and wrong-destination alerts.
Reconcile and report
Tie payment to the payable, subledger to the general ledger, and payment run to the bank. Review overdue AP, debit balances, duplicate flags, old credits, and unmatched receipts.
How payment timing affects cash flow
Supplier terms create a permitted payment window, not free permission to pay whenever convenient. FAR defines a prompt-payment discount as an invoice reduction offered for payment before the due date and, in its contract clause, calculates the discount from the invoice date unless the specified exception applies. Commercial contracts may define the clock differently, so AP must read the actual terms.
| Decision | Payment date | Cash paid |
|---|---|---|
| Take 2% discount | Within 10-day discount window | $49,000 |
| Pay full amount | By 30-day due date | $50,000 |
| Difference | 20 days of additional cash use | $1,000 |
2/10, net 30 means 2% off if paid in 10 days, otherwise the net amount is due in 30 days. Arithmetic: $50,000 × 2% = $1,000. Confirm the invoice date, eligible base, returns, tax, and settlement rule before taking a discount.
The decision is not simply “pay as late as possible.” Finance compares the certain discount, liquidity needed 20 days earlier, borrowing or opportunity cost, supplier criticality, and execution risk. If the payment settles after the discount deadline, taking the deduction may create a dispute. If there is no discount, paying on the agreed due date preserves cash without making the supplier fund an unauthorized delay.
AP turnover ratio and a worked example
| Metric | Formula | Meaning |
|---|---|---|
| Average AP | (Beginning AP + ending AP) ÷ 2 | Simple average supplier balance |
| AP turnover | Net credit purchases ÷ average AP | Times average AP turns over in the period |
| Payables days | Days in period ÷ AP turnover | Approximate average payment period |
QuickBooks documents net credit purchases as the numerator. OpenStax presents cost of goods sold in its working-capital example. If COGS is used because net credit purchases are unavailable, label it as a proxy and compare consistently.
| Input or calculation | Amount |
|---|---|
| Net credit purchases | $960,000 |
| Beginning AP | $140,000 |
| Ending AP | $180,000 |
| Average AP | $160,000 |
| AP turnover | 6.0 times |
| Payables days | 60.8 days |
Arithmetic: average AP = ($140,000 + $180,000) ÷ 2; turnover = $960,000 ÷ $160,000; days = 365 ÷ 6.0. Figures are illustrative, not a target.
Interpretation requires context. A lower turnover may reflect longer negotiated terms, a quarter-end purchase, constrained liquidity, or overdue invoices. A higher turnover may reflect early discounts, shorter terms, fewer purchases, or a decision to pay faster. Compare the same numerator and period over time, then inspect due-date aging and supplier terms before concluding that either direction is better.
AP controls that protect cash and supplier trust
- Give each invoice one intake record and search normalized fields for duplicates before posting.
- Verify a supplier bank or wallet change through a trusted contact independent of the request.
- Do not let invoice approvers create suppliers and release their own payments without compensating review.
- Report payables by due date, discount date, dispute, currency, and funding account rather than one undifferentiated total.
- Resolve debit balances and old credits so the ledger does not conceal money owed back by suppliers.
- Review manual payment, rush payment, duplicate override, and after-hours release patterns.
- Reconcile the supplier statement where available, especially for high-volume or critical vendors.
Accounts-payable questions
Are accounts payable an expense?
No. AP is the liability for unpaid supplier obligations. The related inventory, asset, or expense follows the nature and timing of what was purchased. Paying AP reduces the liability and cash.
What is the difference between AP and an accrued expense?
AP commonly represents a supplier amount supported by an invoice. An accrual records an incurred cost before final billing or payment. The exact classification follows the accounting policy and facts.
What does 2/10, net 30 mean?
A 2% discount is available if eligible payment is made within 10 days; otherwise the full net amount is due within 30 days. Confirm which date starts the clock and when the payment counts as made.
What is the correct AP turnover formula?
Net credit purchases divided by average accounts payable. Average AP is beginning plus ending AP divided by two. If COGS is used as a proxy, disclose that because COGS and credit purchases are not identical.
Does a high AP turnover ratio mean AP is healthy?
Not by itself. It can mean fast payment, but it can also reflect short supplier terms, weak use of agreed credit, or a changed purchase mix. Compare terms, overdue AP, discounts, supplier concentration, and consistent periods.
When should a business pay a supplier invoice?
After validation, receipt or performance evidence, approval, and fraud checks, on a date that captures an economic discount when appropriate or meets the agreed due date while fitting the cash forecast.
How should AP handle new bank details on an invoice?
Pause the payment, verify the change through a known independent contact, apply it through controlled supplier-master access, and retain who verified it and how. Do not rely on the changed invoice or reply-to address alone.
Sources
External links open in a new tab.
- Balance sheet building blocks — US Securities and Exchange Commission
- Beginner’s guide to financial statements — US Securities and Exchange Commission
- IAS 37 Provisions, Contingent Liabilities and Contingent Assets — IFRS Foundation
- Payment documentation and process, FAR 32.905 — Acquisition.gov
- Accounts payable turnover ratio — QuickBooks Canada
- Merchandising versus service activities and transactions — OpenStax
- Discounts for Prompt Payment, FAR 52.232-8 — Acquisition.gov
- FAR 32.902 Definitions — Acquisition.gov
- What is working capital? — OpenStax
- Policy and Procedures Manual, Title 7 — US Government Accountability Office
- Business Email Compromise — Federal Bureau of Investigation
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