Is accounts payable a debit or a credit?

Accounts payable is a liability account, so it normally carries a credit balance. Recording a supplier invoice credits accounts payable and debits the expense or inventory account. Paying the invoice debits accounts payable and credits cash. A debit balance usually means an overpayment or a payment posted to the wrong vendor.

What is a three-way match?

A three-way match compares the purchase order, the receiving record and the supplier's invoice before payment. Quantities, prices and terms on all three must agree within a set tolerance. If 380 cartons arrived but the invoice bills 400, the difference is held until the supplier issues a credit or ships the rest.

How do you calculate days payable outstanding?

DPO equals average accounts payable divided by cost of goods sold for the period, multiplied by the days in the period. With $48,000 of average payables and $620,000 of annual cost of goods sold, DPO is 48,000 ÷ 620,000 × 365, about 28 days. Compare it with your suppliers' terms to see whether you pay early or late.

Do I need a W-9 from every vendor?

Collect one from every vendor you might have to report on Form 1099, which in practice means every unincorporated service provider, before the first payment. For payments in 2026 you generally file Form 1099-NEC when you pay a non-employee $2,000 or more for services. If a vendor won't give a taxpayer identification number, backup withholding at 24% may apply.

What is the most common accounts payable fraud?

Payment redirection through business email compromise is among the costliest. A fraudster impersonates a real supplier, often from a hacked or look-alike email account, and asks you to change its bank details. The FBI's 2025 Internet Crime Report recorded 24,768 business email compromise complaints with losses of $3.05 billion. Always confirm bank changes by phone using a number already on file.

Finance & accounting

Accounts Payable: The Process, the Three-Way Match, DPO and Fraud Controls (2026)

Accounts payable explained for 2026: the AP process step by step, three-way match, the DPO formula, W-9 and 1099 vendor tracking, and fraud controls that work.

Edited by Sumeet YadavFounder & editor, MSMETOOLS · fact-checked against official sources

Updated October 2026 Verified against official sources 11 October 2026 16 min read

Accounts payable — MSMETOOLS guide cover

Contents (11)

1. What accounts payable means
2. The accounts payable process, step by step
3. The three-way match, with a worked example
4. Days payable outstanding: how fast do you pay?
5. Early-payment discounts: when paying early pays
6. Paying small vendors and freelancers on time
7. Vendor onboarding, W-9s and 1099 tracking
8. Fraud controls that actually work
9. Month-end: accruals, cut-off and reconciliation
10. Common mistakes
11. What to do next

Accounts payable is where a business's money actually leaves the building, which makes it the place where cash planning, supplier relationships, tax reporting and fraud risk all meet. This guide is for US small business owners, bookkeepers and new finance staff who pay supplier bills. It explains what accounts payable means, the step-by-step AP process, how a three-way match catches errors before you pay, how to measure and manage days payable outstanding, how to track vendors for Form 1099 under the 2026 rules, and the controls that stop the payment frauds costing US businesses billions. Tax and fraud figures were checked against IRS and FBI sources in October 2026.

Quick answer

Accounts payable (AP) is money your business owes suppliers for goods or services already received but not yet paid. It is a current liability. A sound AP process matches each invoice to its purchase order and receiving record (the three-way match), pays on the due date rather than early unless a discount pays, and verifies every vendor's identity and bank details before money moves.

DPO = average payables ÷ cost of goods sold × days in the period
Collect a W-9 before the first payment to any service vendor
1099-NEC applies from $2,000 a year for payments in 2026, up from $600
Confirm bank-detail changes by phone using a number already on file
Separate who approves, who pays and who reconciles

What accounts payable means

Accounts payable is the total of unpaid bills from suppliers and service providers at a point in time: inventory and raw materials bought on credit, contractor and freelancer invoices, utilities, software subscriptions, rent and professional fees billed on terms. Cornell's Legal Information Institute describes it as money a business owes for products or services already received, recorded as a short-term obligation until paid.

On the balance sheet, AP is a current liability, because you expect to pay it within a year and usually within weeks. It does not include bank loans, credit card balances, payroll or sales taxes owed to the government, or accrued expenses for which no invoice has arrived yet; those sit in their own liability accounts. Your supplier records the same amount as accounts receivable, so one company's payable is another's receivable. The accounts receivable guide covers the other side of the same transaction.

Under accrual accounting, a supplier invoice is recorded when you receive the goods or services and the invoice, not when you pay. A $7,030 inventory delivery is recorded as a debit to inventory and a credit to accounts payable. When you pay, you debit accounts payable and credit cash. Under the cash method, which many small businesses use for tax, nothing is recorded until payment, but you still need an AP list to know what you owe and when.

The accounts payable process, step by step

The full cycle is often called procure-to-pay. A small business may run it with one person and a spreadsheet; a larger one splits it across purchasing, receiving and finance. Either way, the steps are the same, and skipping any one of them is how duplicate payments, overbilling and fraud get through.

The procure-to-pay cycle

1
Request and approve the purchase
Someone with budget authority approves the need before the order is placed.
2
Issue a purchase order
The PO states the supplier, items, quantities, prices, delivery terms and payment terms.
Create a purchase order
3
Receive and record the goods or services
Receiving counts what actually arrived, notes damage or shortages, and records it against the PO.
4
Capture the invoice
Log every invoice in one place, with the invoice number, date, amount, due date and PO number.
5
Match and resolve exceptions
Compare PO, receiving record and invoice; hold differences until the supplier corrects them.
6
Approve for payment
An approver confirms the matched invoice is valid and coded to the right account.
7
Schedule and pay
Pay on the due date, or earlier only to capture a discount; use controlled payment methods.
8
Record and reconcile
Post the payment, reconcile the AP ledger to the general ledger and to supplier statements each month.

Three habits make the cycle work. First, a single front door for invoices: one email address or portal, so nothing sits in someone's inbox. Second, "no PO, no pay" for anything above a small threshold, so every purchase was approved before it was made. Third, a weekly payment run with a fixed cut-off, so approvers know when invoices must be cleared and suppliers know when to expect money.

The three-way match, with a worked example

A three-way match is the core AP control. Before paying, you compare three documents: the purchase order (what you agreed to buy, at what price), the receiving record (what actually arrived) and the invoice (what the supplier is billing). Quantities, unit prices, totals and terms must agree. If they don't, the difference is held while you resolve it with the supplier.

A two-way match compares only the PO and the invoice and is common for services, where there is no physical delivery to count. A four-way match adds an inspection or quality record, used where goods must pass testing before acceptance. Most businesses set tolerances, such as allowing price differences under 1% or $25, so that trivial rounding doesn't stop payment.

Worked example. A specialty food producer orders 400 cartons of glass jars at $18.50 each, total $7,400, on net 30 terms. The receiving clerk counts 380 cartons and notes the shortfall on the delivery record. The supplier's invoice bills 400 cartons at $18.75, plus $95 freight that was not on the PO.

Three-way match on a jar order

Check	Purchase order	Receiving record	Invoice	Result
Quantity	400 cartons	380 cartons	400 cartons	20 cartons billed but not received
Unit price	$18.50	—	$18.75	$0.25 a carton over the agreed price
Freight	Not included	—	$95	Not authorized on the PO
Total	$7,400	380 × $18.50 = $7,030	$7,595	$565 difference

Quantity

Purchase order: 400 cartons
Receiving record: 380 cartons
Invoice: 400 cartons
Result: 20 cartons billed but not received

Unit price

Purchase order: $18.50
Receiving record: —
Invoice: $18.75
Result: $0.25 a carton over the agreed price

Freight

Purchase order: Not included
Receiving record: —
Invoice: $95
Result: Not authorized on the PO

Total

Purchase order: $7,400
Receiving record: 380 × $18.50 = $7,030
Invoice: $7,595
Result: $565 difference

The match approves $7,030, the value of what was ordered and received at the agreed price, and holds $565. The AP clerk emails the supplier with the PO and receiving record attached, asking for a credit memo for the 20 missing cartons and the price difference, and for confirmation of who bears freight. Without the match, the business would have paid $565 it didn't owe, and on a high-volume account such small errors add up to real money over a year.

A 1905 coal invoice comparing the buyer's weights with the invoice weights for each rail car and noting the shortage — Matching what was billed against what was received is an old control: this 1905 coal invoice lists the buyer's weights beside the invoice weights for each rail car and totals the shortage.· Image: Thomas Fisher Rare Book Library, UofT (CC BY 2.0)

Days payable outstanding: how fast do you pay?

Balances alone don't tell you whether you pay suppliers early, on time or late. Days payable outstanding (DPO) converts the AP balance into days. The usual formula is average accounts payable divided by cost of goods sold for the period, multiplied by the number of days in the period. Some analysts use total purchases instead of cost of goods sold, which is more accurate when inventory levels change a lot. The cost of goods sold guide explains how that figure is built.

Worked example. The food producer had $44,000 of payables at the start of the year and $52,000 at the end, so average AP is $48,000. Cost of goods sold for the year was $620,000. DPO = 48,000 ÷ 620,000 × 365 = about 28 days.

Its main suppliers offer net 45 terms. Paying in 28 days means it pays roughly 17 days early on average and gives up free credit. Each day of payables is worth about $1,700 (620,000 ÷ 365), so moving to paying on the due date would keep roughly 17 × $1,700, or about $28,400, more cash in the business at any time, with no cost and no harm to the relationship as long as payments arrive on the due date.

Food producer AP at a glance

28 days

DPO

$48,000 ÷ $620,000 × 365

45 days

Supplier terms

Net 45

≈ $1,700

Cash per day of payables

$620,000 ÷ 365

≈ $28,400

Cash kept by paying on the due date

17 days × $1,700

Higher DPO is not automatically better. Paying beyond terms damages supplier relationships, can cost you late fees or credit holds, and may breach state laws that set payment deadlines. Low DPO is fine if you are taking early-payment discounts. The goal is to pay each bill on its due date, deliberately, unless there is a reason to do otherwise. Use the working capital calculator to see how your payables, receivables and inventory combine.

Early-payment discounts: when paying early pays

The one good reason to pay early is a discount worth more than the cash. Under 2/10 net 30, you can take 2% off if you pay within 10 days instead of 30. Giving up 2% for 20 days of credit is equivalent to an annual rate of about 37% (2 ÷ 98 × 365 ÷ 20). If you have the cash, or can borrow it for less than that, taking the discount is one of the best returns available.

On $40,000 a month of purchases from a supplier offering 2/10 net 30, discounts are worth $800 a month, or $9,600 a year. To capture them reliably, your process has to get invoices matched and approved within days, not weeks. That is a practical reason to tighten the front end of the AP cycle: slow approvals don't just annoy suppliers, they forfeit discounts. The payment terms guide shows the annualized cost of other discount terms.

Paying small vendors and freelancers on time

Some vendors have legal deadlines on their side. New York's Freelance Isn't Free Act, statewide since August 2024, requires a written contract stating the payment date for individual freelancers paid $800 or more over 120 days. California and Illinois freelancer laws require payment on the contract date, or within 30 days of completing the work if the contract is silent, for engagements from $250 in California and $500 in Illinois. Most states also have construction prompt payment laws that impose interest on late payments to contractors.

If your business hires freelancers in these states, flag them in your vendor master so their invoices are scheduled to meet the statutory deadline rather than your standard terms, and keep the signed contract on file for as long as the law requires.

Vendor onboarding, W-9s and 1099 tracking

Every payment you make starts with a vendor record, and a clean vendor master is both your best tax-reporting tool and your first fraud control. Before the first payment, collect the vendor's legal name, address, contact, payment terms and bank details, and a Form W-9 from any vendor you might have to report on a Form 1099. The W-9 guide walks through the form.

Before a new vendor's first payment

0/7

For payments made in 2026, you generally must file Form 1099-NEC for each non-employee individual, partnership or LLC you paid $2,000 or more for services in the course of your business. That threshold applies to tax years beginning after 2025, up from $600, and the IRS says it may be adjusted for inflation from 2027. The form goes to the vendor and the IRS by January 31. Payments to most corporations are excluded, but attorneys' fees are reportable even if the law firm is incorporated. Payments you make by credit card or through a third-party payment network are reported by the payment processor on Form 1099-K, not by you on 1099-NEC.

Worked example. In 2026, the food producer pays a freelance designer $1,800 by ACH, a sole-proprietor electrician $2,400 by check, an incorporated accounting firm $6,000, and a photographer $2,500 by credit card. Only the electrician needs a 1099-NEC: the designer is under $2,000, the accounting firm is a corporation, and the photographer was paid by card.

Which 2026 payments need a 1099-NEC?

Vendor	Paid	How	1099-NEC?
Freelance designer (individual)	$1,800	ACH	No — under $2,000
Electrician (sole proprietor)	$2,400	Check	Yes
Accounting firm (corporation)	$6,000	ACH	No — corporation
Photographer (individual)	$2,500	Credit card	No — reported on 1099-K by the processor

Freelance designer (individual)

Paid: $1,800
How: ACH
1099-NEC?: No — under $2,000

Electrician (sole proprietor)

Paid: $2,400
How: Check
1099-NEC?: Yes

Accounting firm (corporation)

Paid: $6,000
How: ACH
1099-NEC?: No — corporation

Photographer (individual)

Paid: $2,500
How: Credit card
1099-NEC?: No — reported on 1099-K by the processor

If a vendor won't provide a taxpayer identification number, or the IRS tells you the name and number don't match, you may have to start backup withholding at 24% of payments and send it to the IRS. Avoid that by collecting the W-9 before you pay and, if you file 1099s regularly, checking names and numbers through the IRS TIN Matching service before filing. Track 1099-eligible spending by vendor throughout the year so January is a report, not a project. The 1099 vs W-2 guide covers whether a worker should be on payroll instead.

Fraud controls that actually work

Accounts payable is the most common target for business payment fraud because it is the function that sends money out. The losses are large. The FBI's Internet Crime Complaint Center received 24,768 complaints of business email compromise in 2025, with reported losses of $3.05 billion, the second-largest loss category after investment fraud. Total reported internet crime losses were $20.877 billion, up 26% from 2024.

The typical scheme is simple. A fraudster takes over or imitates a real supplier's email account, sends a convincing message saying the supplier has changed banks, and attaches new account details. The next legitimate invoice is paid to the fraudster, and by the time the real supplier asks why it hasn't been paid, the money has been moved. Other schemes include fake vendors set up by an insider, duplicate invoices submitted twice with slightly different numbers, and altered or stolen checks.

A brick warehouse with a sign marking receiving dock number 5 beside an industrial street — The receiving dock is part of AP control: an independent count of what arrived is what makes the three-way match meaningful.· Image: bradleygee (CC BY 2.0)

The controls that stop these are mostly procedural:

Verify every bank-detail change by phone, using a number already in your vendor file or from the original contract, never one from the email requesting the change. Hold payment until it is verified.
Separate duties. The person who sets up vendors should not approve invoices, and the person who approves should not release payments or reconcile the bank account. In a very small business, the owner should at least approve new vendors and review the payment run.
Require dual approval for payments above a threshold and for any first payment to a new or changed bank account.
Detect duplicates. Block invoices with the same vendor, amount and date or with near-identical invoice numbers.
Use bank fraud services. Positive pay for checks and ACH debit blocks or filters let your bank reject items you haven't authorized.
Review the vendor master quarterly for inactive vendors, duplicate records, vendors sharing an address or bank account with an employee, and missing W-9s.

Handling a bank-detail change request

Step 1

Request arrives by email or letter

Step 2

Hold all payments to that vendor

until verified

Step 3

Call a number already on file

never one in the request

Step 4

Second person approves the change

Step 5

Small test payment, then normal run

If you discover a fraudulent payment, call your bank immediately and ask it to recall the payment, then file a complaint with IC3. The FBI's Recovery Asset Team works with banks to freeze funds in fraudulent accounts, and speed is what makes recovery possible.

Month-end: accruals, cut-off and reconciliation

At month-end, make sure your payables reflect everything you owe, not just the invoices that happen to have arrived. Goods received without an invoice should be accrued as a liability at the PO price, and services used, such as utilities or a contractor's hours, should be estimated and accrued. Reverse the accruals when the invoices arrive.

Reconcile three things monthly: the AP subledger total to the accounts payable balance in the general ledger, major suppliers' statements to your vendor balances, and the bank account to recorded payments. Supplier statements are especially useful: they show invoices you haven't recorded, payments the supplier hasn't applied, and credits you are owed. Investigate any debit balance on a vendor account, which usually means an overpayment you should recover.

Common mistakes

Paying from the invoice alone. Without a PO and receiving record, you can't tell whether you're paying for what you ordered and received.

Paying everything as soon as it arrives. Unless you are earning a discount, paying a net 45 bill on day 10 gives away 35 days of free financing.

Changing bank details on the strength of an email. This is how most payment-redirection frauds succeed. Call a known number.

Collecting W-9s in January. By then the vendor may be gone. Make the W-9 a condition of the first payment.

Letting one person do everything. Combining vendor setup, approval, payment and reconciliation in one role removes every check.

Ignoring statutory deadlines for freelancers and contractors. Standard terms don't override state payment laws.

Official guidance

What to do next

Map your current process against the procure-to-pay steps above and fix the weakest link first, usually invoice capture or bank-change verification. Issue POs with the purchase order generator, calculate your DPO and compare it with supplier terms, and check your cash position with the working capital calculator. Then read the accounts receivable guide for the other half of working capital, and the W-9 guide before onboarding your next vendor.

This is general information, not legal or tax advice — confirm on the official source or with a professional.

Frequently asked questions

Accounts payable is the money your business owes suppliers for goods or services it has already received but not yet paid for, such as an inventory delivery on net 30 terms or a contractor's monthly invoice. It is a current liability on the balance sheet and is cleared when you pay the bill.

Sources & verification

Figures on this page were checked against the sources below when it was last reviewed on 11 October 2026. Each rate and limit is stored once with its own official source and review date, and official update channels are monitored daily so changes are picked up. How we verify

1.Accounts payable — Legal Information Institute, Cornell Law School · accessed 11 October 2026
2.Instructions for Forms 1099-MISC and 1099-NEC — Internal Revenue Service · accessed 11 October 2026
3.Backup withholding — Internal Revenue Service · accessed 11 October 2026
4.Taxpayer Identification Number (TIN) Matching — Internal Revenue Service · accessed 11 October 2026
5.2025 Internet Crime Report — FBI Internet Crime Complaint Center · accessed 11 October 2026
6.Freelance Worker Protection Act — Illinois Department of Labor · accessed 11 October 2026
7.N.Y. General Business Law § 1410 (Freelance Isn't Free Act) — New York State Senate · accessed 11 October 2026
8.Prompt Payment — Bureau of the Fiscal Service, U.S. Treasury · accessed 11 October 2026

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We provide tools, guides and information for general educational purposes only. Always refer to official government websites for the latest and most accurate information.