Reversing Journal Entry

A reversing journal entry is a journal entry with a built-in expiration date. It posts in one period, and on the first day of the next period an identical entry posts against it with the debit and credit flipped, which cancels it out before anyone has to remember to.

The case it exists for is the expense accrual. A company receives a service in March but the vendor's invoice does not arrive until April. Waiting for the invoice means March's expenses are understated. The fix is to estimate the cost and accrue it in March, which is a normal adjusting journal entry. The problem starts in April, when the real invoice shows up: post it as a fresh expense on top of March's estimate, and the cost is now counted twice. Skip posting it because "we already accrued for that," and the accrual sits on the books indefinitely, quietly wrong. A reversing entry solves this by canceling the March estimate automatically at the start of April, so April's invoice can post exactly the way it would have if no accrual had ever happened.

The mechanics only work if three things hold. The reversing entry has to hit the same accounts as the original, for the same amount, just flipped. It has to post on the first day of the next period, not sometime later once someone remembers. And it has to be flagged as reversing at the moment the original entry is created, not decided after the fact, because the whole point is that nobody has to track it separately once it is set up.

Revenue accruals for services delivered but not yet billed follow the identical pattern in the other direction, and payroll accruals for days worked after the last pay date use it too: estimate now, reverse automatically, let the real transaction land clean.

Two failure modes show up wherever this is still a manual habit rather than a system-enforced rule. The first is the one above: someone forgets the reversal ran, or forgets it should have, and an estimate becomes a permanent, undetected duplicate. The second is subtler: a team uses a recurring standing entry as a substitute for a true reversing entry, because it is faster to set up, and loses the audit trail that shows the estimate was deliberately created and deliberately cleared. Neither failure is visible in the trial balance the month it happens. Both show up eventually, usually at the least convenient time to explain them.

Go deeper: The Month-End Close: The Complete Guide

Adopt's agents draft the accrual entry, flag it as reversing at the moment it is created, and confirm the reversal actually posted the following period, so an estimate never quietly turns into a duplicate. Sign up free.