Do you close out aging accounts at month end?

AP and AR subledgers are locked to new postings at month-end close, but individual aging accounts aren't zeroed out or forced closed — open invoices stay open and continue aging into the next period. What happens is a snapshot: the aging report as of the cutoff date becomes part of that period's official record.

By Zuny Fester, Head of Operations and Marketing

Reviewed by Zuny Fester

Published September 10, 2026Last reviewed September 10, 2026Editorial policy

Part of the month-end close guide.

What locks	New postings to AP and AR subledgers for the closed period
What doesn't happen	Open invoices are not force-closed or zeroed out
What becomes official	The aging report snapshot as of the cutoff date
What continues	Open invoices keep aging normally into the next period

What "closing out" actually means here

Locking a period stops new transactions from posting to it — it doesn't force every open invoice to a zero balance. A customer who owes money at the end of March still owes that money in April; the aging report simply reflects a snapshot as of the March cutoff date for reporting purposes, while the underlying invoice keeps aging into the following period until it's actually paid, written off, or otherwise resolved.

What does get reviewed at close

At close, the AR aging balance is reconciled against the general ledger AR balance, and any accounts that have crossed a write-off threshold are evaluated for a bad-debt reserve adjustment. Neither of these zeroes out an aging account outright — they confirm the numbers are accurate and appropriately reserved, not that every balance has been settled.

Next step

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Checklist

What actually happens to AR/AP at close

AP and AR subledgers are locked to new postings
The aging report is snapshotted as of the cutoff date
Aging totals are reconciled against the general ledger
Accounts past a write-off threshold are evaluated for bad-debt reserve
Open balances continue aging normally into the next period

Frequently Asked Questions

No — collections continue on open invoices regardless of period lock; the lock only affects which period new transactions post to.

It posts to the current open period against the still-open invoice, applying against the original invoice balance regardless of which period it was originally booked in.

It's typically booked in the current open period once the decision is made, not backdated into the already-closed period the invoice originated in.

Sources

Topic

Month-End Close

Month-end close is the set of accounting tasks a company runs after a calendar month ends to turn raw transactions into a finished, trustworthy set of financial statements: reconciling subledgers, boo…

Definition

What is month-end close?

Month-end close is the set of accounting tasks run after a calendar month ends to turn raw transactions into finished, trustworthy financial statements: reconciling subledgers, booking accruals, eliminating intercompany activity, reviewing the result, and locking the period so nothing more can post without an explicit reopen.

How-to

How do I lock periods to prevent backdated edits from unreconciling matches?

Lock the accounting period from the Period Close Checklist once reconciliations are complete, restricting new AP, AR, and payroll postings to that period. Only users with an explicit override permission can then post backdated transactions, which keeps an already-reconciled period from silently drifting out of balance.