The short answer: The accounts payable month-end close runs on five controls: an invoice cutoff, accruals for costs received but not yet billed, a tie-out of the AP aging to the general ledger, a second-person review, and a period lock. In the worked example below, 23 late vendor invoices worth $58,740 would have overstated one month’s gross margin by 4.3 points.
- Cutoff follows the date goods or services arrived, never the invoice date or the payment date.
- An invoice capture deadline of business day 3 leaves two days for review inside a 5-day close.
- The AP aging and the AP control account must agree to the dollar before the period locks.
- Missed accruals distort two months: the close month looks too profitable and the next month too expensive.
Last updated September 2026.
Payables are where a month-end close quietly loses accuracy. Revenue gets scrutiny because owners watch it. Vendor costs arrive on the vendor’s schedule, often days or weeks after the work was done, and a close that books only the bills in hand will understate expenses every single month.
The fix is procedural. The sections below cover how to set the cutoff, when to book an accrual, how to reconcile the aging report, and how long the AP portion of the close should take. A worked example runs the arithmetic on a mid-sized distributor.
What are the steps in the accounts payable month-end close?
Five steps, in order: capture every invoice by the cutoff, accrue what arrived without a bill, reconcile the aging to the ledger, review, and lock. Skipping the order produces a reconciled balance that is still incomplete.
| Step | What it proves | Target day (5-day close) | Owner |
|---|---|---|---|
| 1. Invoice capture and cutoff | Every bill for the month is entered | Business day 3 | AP clerk or bookkeeper |
| 2. Accruals for unbilled costs | Costs incurred without an invoice are recorded | Business day 3 | Staff accountant |
| 3. Aging-to-ledger tie-out | The subledger and the AP control account agree | Business day 4 | Staff accountant |
| 4. Review | A second person has checked steps 1–3 | Business day 4 | Controller |
| 5. Period lock | No one can post into the closed month | Business day 5 | Controller |
The AP steps sit inside the wider sequence covered in the month-end close process, and they mirror the receivables side described in the accounts receivable month-end close.
How do you set a vendor invoice cutoff at month end?
Pick a business day, publish it to every approver, and book each invoice to the month the goods or services were received. The deadline controls data entry; the receipt date controls which period the cost belongs to.
Business day 3 is the common choice for a 5-day close. For September 2026, that deadline falls on Monday, October 5, since September 30 is a Wednesday. Any invoice entered by then for September deliveries posts to September. Anything arriving later is handled through an accrual.
The receipt date matters because the auditing standards treat completeness as its own assertion. PCAOB AS 1105 defines it as whether “all transactions and accounts that should be presented in the financial statements are so included.” Unrecorded payables are the textbook completeness failure, which is why auditors run a dedicated search for them.
What is an AP accrual, and when should you book one?
An AP accrual is a journal entry that records a cost incurred during the month before the vendor’s invoice arrives. Book one whenever goods or services were received by month-end and no bill was entered by the cutoff.
Three sources produce most accruals:
- Received, not invoiced. Inventory or materials on the receiving log with no matching bill.
- Services billed in arrears. Contractors, freight, legal, and staffing firms that invoice after the month ends.
- Recurring costs. Utilities, telecom, and usage-based software whose statements lag the service period.
A materiality threshold keeps the work proportionate. Many companies accrue individual items of $2,500 or more and combine smaller ones into a single estimate. Set accruals to reverse on the first day of the next month, so the real invoice posts cleanly against the reversal instead of doubling the expense.
Tax timing follows similar logic. IRS Publication 538 states that accrual-method businesses generally deduct an expense once the all-events test is met and economic performance has occurred.
What happens when late vendor invoices are not accrued?
Consider an illustrative wholesale distributor with $16.4M in annual revenue, or about $1,366,667 a month. Its cost of goods sold runs near 71% of revenue, so true gross margin is 29.0%.
After the September close, 23 invoices for September deliveries arrive late, totaling $58,740. Nobody accrued them, so September cost of goods sold is understated by the full amount.
The distortion is measurable. Dividing $58,740 by $1,366,667 gives 4.3 points of margin. September reports 33.3% gross margin instead of 29.0%.
October then absorbs the same $58,740 and reports roughly 24.7%. The month-over-month swing is 8.6 points, and none of it reflects pricing or operations. A board reading those two months would draw the wrong conclusion twice. The same pattern appears in our breakdown of month-end close errors that distort margins.
One accrual entry on business day 3 would have prevented both errors.
How do you reconcile the AP aging report to the general ledger?
Run the AP aging as of the last day of the month, compare its total to the AP control account balance, and explain every dollar of difference. The target variance is zero.
Differences usually trace to three causes. A journal entry posted straight to the AP account without a vendor attached. A bill dated in one month but entered with a date in another. A vendor credit or prepayment recorded outside the subledger.
In the distributor example, the aging totals $412,905 and the control account shows $427,318. The $14,413 gap resolves into two items: a $9,860 manual journal entry with no vendor, and a $4,553 bill dated October 2 but posted to September. Reclassing the first and correcting the date on the second brings the variance to zero.
While the aging is open, scan the over-90-day column. Old unpaid balances are often duplicates, disputed bills, or payments recorded as expenses instead of against the bill. Cleaning up that history is covered in the step-by-step QuickBooks cleanup guide.
How long should the AP portion of the close take?
About three business days in a 5-day close. Invoice capture and accruals finish by business day 3, the tie-out and review land on business day 4, and the lock happens on business day 5.
Speed depends on how early invoices reach the books. Automation through Bill.com or the payables module in QuickBooks Online or NetSuite captures bills when they arrive rather than at month-end, which shortens step 1. It does not replace the accrual review or the tie-out, since software only records the invoices it has received.
The Continuous Close Method™ applies the same principle to the full ledger: bills are coded and matched as they land, so month-end holds review work instead of data entry. Aaron Ressel reviews the AP tie-out on each engagement before the period locks. The day-by-day schedule appears in the five-day close calendar, and ongoing ownership of these controls is part of Debit & Co.’s outsourced controller services.
Frequently asked questions
How do you handle vendor invoices that arrive after the cutoff?
If the goods or services were received during the closed month, record an accrual for that month and let it reverse on day 1 of the next month. When the invoice arrives, enter it normally in the new month; the reversal offsets it, so the expense lands once, in the correct period. Invoices for costs incurred after month-end simply post to the new month.
Do you need to reopen a closed month for a late invoice?
Rarely. Reopening a locked period changes statements that owners and lenders may already have read. Most late invoices are handled through the accrual and reversal pattern instead. Reserve a reopen for material errors, and document the reason, the amount, and the approver when it happens.
How does bill automation change the AP close?
Tools such as Bill.com capture invoices on arrival, route approvals, and sync bills to the ledger, which moves data entry out of the close window. The controls stay the same. A person still has to accrue costs that arrived without a bill, tie the aging to the ledger, and review before the lock.
How do I clear old accounts payable in QuickBooks?
Start by reviewing each open bill older than 90 days. Match bills that were actually paid to the payment that should have closed them, void confirmed duplicates, and confirm disputed balances with the vendor. Any write-off of a genuine old balance should be dated in the current period, so prior-period statements stay intact.
What should an AP month-end close checklist include?
Invoice capture by a stated cutoff day, a receiving-log comparison for unbilled goods, an accrual list with amounts and reversal dates, an aging-to-ledger tie-out at zero variance, a review sign-off, and a period lock. Each line should carry an owner and a due day.
