Journal Entries & Estimates
True-up in accounting: what it is and when you book one
A true-up is an entry that brings a recorded amount to the better figure once it's known. The term covers two genuinely different situations, and most explanations of it blur them together.
You recorded a number based on the best information you had. Now you have better information. The true-up is the entry that closes the gap — for the difference only, not a reversal and rebook of the whole amount.
That definition is right, and it's also where most explanations stop. The part worth knowing is that "better information" arrives in two different ways, and they produce two different kinds of true-up.
| Estimate to actual | Balance to target | |
|---|---|---|
| What changes | The real number arrives — an invoice, a statement, a final figure | You recalculate what a balance should be, using current data |
| How often | Once per estimate, when the actual lands | Every period, as a recurring close task |
| Typical accounts | Accrued expenses, estimated liabilities, unbilled amounts | Reserves, allowances, contra accounts |
| What the entry books | Actual minus what was accrued | New target balance minus the current balance |
Estimate to actual
This is the version every textbook uses, and it's the easier one.
At August close there's no invoice yet for the month's utilities, so you accrue $4,200 based on recent consumption. The invoice arrives in September for $4,650. The true-up is $450 — the difference — booked in September.
| Amount | |
|---|---|
| Accrued at August close | 4,200 |
| Actual invoice received | 4,650 |
| True-up, September | 450 |
Once the actual is in, this estimate is finished. There's nothing left to true up.
The illustrative figures here and below are synthetic and the entity doesn't exist.
Balance to target
This is the one practitioners spend most of their time on, and it's usually what people mean when they say they're truing up a reserve.
A reserve or allowance isn't waiting on an invoice. It's an estimate of something that won't fully resolve for months — returns, credit losses, rebates. So each period you recalculate what the balance should be using current activity and your estimation method, compare that to what's on the books, and book the difference.
| Amount | |
|---|---|
| Reserve balance, prior month end | 182,000 |
| Recalculated target, current month end | 196,500 |
| True-up this period | 14,500 |
The expense isn't calculated directly. It falls out of the difference between where the balance is and where it should be. That's a distinct method from calculating expense as a percentage of activity and letting the balance land wherever it lands — and it's the reason a documented estimation method matters more than the entry itself.
Unlike the first kind, this never finishes. Next month you recalculate again.
The true-up journal entry
Mechanically, the entry is small: it books only the difference, to the same accounts the original estimate used.
In the utilities case, the $450 goes to the same expense account the accrual hit, with the offset clearing against the accrued liability as the actual invoice is recorded. In the reserve case, the $14,500 increases the reserve with the offset to the expense or contra account the reserve relates to.
Two things to get right that are easy to get wrong:
- The period. A true-up for a change in estimate is recorded when the better information arrives, going forward — not by reopening the period the estimate was made in. That's the line between a change in estimate and an error, covered in more detail here. If what you've found means a prior period was materially wrong, that's a different question entirely, and it's decided on materiality rather than on what you call the entry.
- The direction. A true-up can go either way. Accruing too little produces an upward true-up; accruing too much produces a downward one, sometimes called a true-down.
True-up vs true-down
A true-down is a true-up going the other direction — not a separate mechanism, just the case where you accrued or reserved too much rather than too little. The utilities example above happens to be an upward true-up because the actual invoice came in higher than the accrual; if it had come in lower, the same entry, mirrored, would be a true-down.
The confusion usually isn't about the mechanics — it's that "true-up" gets used loosely to mean "correct the balance," in either direction, while "true-down" only ever means the downward case. If someone says "we need to true that up" when the balance is actually too high, they mean true it down. The entry doesn't care what you call it; the account, the amount, and the direction are what a reviewer checks.
True-up vs adjusting entry
These aren't really alternatives. A true-up is a kind of adjusting entry — specifically one that corrects an earlier estimate toward a better figure.
Every true-up is an adjusting entry. Not every adjusting entry is a true-up: recognizing a prepaid as it's consumed, or recording depreciation, adjusts the books without correcting any earlier estimate. The vocabulary around entry types is looser than most sources admit, and the published definitions conflict on the edges.
When a pattern of true-ups is worth a second look
A single true-up tells you the estimate was off by some amount, which is normal — that's what an estimate is.
A run of true-ups in the same direction is worth noticing, though not because it points to one clear cause. If an accrual gets trued up upward every month — $2,800, then $3,100, then $2,650, then $3,400 — there are a few honest explanations, and the pattern alone doesn't tell you which one you're looking at.
The distinction matters because the two calls for different things. A trend that reflects real seasonality or growth is a case for revisiting the inputs to the estimate — the method may be sound but built on activity levels that have since moved. A true-up that's really catching up on a chronic under-accrual is closer to a recurring entry's design going stale: the process keeps running correctly on assumptions the business has quietly outgrown.
Either way, the same-direction run is the thing worth noticing. What it means takes a closer look at what's actually driving the activity behind the estimate, not just at the string of true-ups itself.
What to put in the description
"True-up" on its own tells a reviewer almost nothing. A useful description names what estimate is being corrected and toward what:
- "True-up of August utilities accrual to invoice #…"
- "Reserve true-up to recalculated target, September"
That's the difference between an entry a reviewer can follow in ten seconds and one they have to ask about.
How a true-up shows up in flux
On a reserve or accrual account, a true-up posted during the month is often most or all of that month's movement — which makes the true-up the driver. The commentary should name what was trued up, by how much, and why the estimate moved. "Accrual trued up" restates the entry. "August utilities accrual trued up $2,800 to the actual invoice; usage ran higher than the estimate assumed" names a cause a reviewer can check.
If you want to confirm the driver lines actually cover the movement before it goes to review, the commentary test does that arithmetic in your browser.
Most of this surfaces again at flux review. The free flux template flags which balances moved enough to explain. The CloseOps Flux & Variance System ($79) starts from your trial balance instead: confirm each account's classification and it builds the income statement and balance sheet flux statements, then ranks what to investigate.
Related: reclass vs adjusting entry, what actually goes into an accounting estimate, why a recurring entry's design goes stale, and reversing entries — a true-up is never the reversing kind.
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