Adjusting Entries Explained: How the Books Get Accurate at Period End

Why the raw books aren't quite right at period end

Throughout the month, your books record the obvious stuff: invoices go out, bills come in, the bank feed gets categorized. But accrual accounting demands that revenue land in the period it's earned and expenses land in the period they're incurred — and a handful of real economic events don't announce themselves with a transaction at the right moment. Your team works the last week of the month but isn't paid until next month. You paid a year of insurance up front in January. A customer prepaid for a service you haven't delivered yet. Left alone, each of these makes a period's profit wrong.

Adjusting entries are the period-end corrections that fix exactly this — bringing the books in line with what actually happened during the period before you produce financial statements. They're usually the backbone of a month-end close. This guide walks the four types in plain English. (General education, not accounting or tax advice.)

The two questions every adjusting entry answers

Every adjusting entry exists because either an expense or revenue is in the wrong period — recorded too early, too late, or not yet at all. That gives four classic types, split into two pairs:

• Accruals — the event happened, but no transaction has recorded it yet. You need to record something that's missing.
• Deferrals — cash already changed hands, but the earning or using-up happens later. You need to move an amount you already booked into the right period over time.

Hold those two ideas — record what's missing versus spread what's already there — and the four types stop being a list to memorize.

1. Accrued expenses

An accrued expense is a cost you've incurred but haven't recorded because the bill or payment hasn't happened yet. The textbook case is wages: employees earned pay in the last days of the period, but payday falls in the next one. The expense belongs to this period, so you record it now — debit Wages Expense, credit a "wages payable" liability — and reverse or settle it when payday comes. The same applies to interest that's built up on a loan but isn't due yet, or a utility you've consumed but haven't been billed for. Skip these and you understate expenses and overstate profit. (Related: the current ratio you read off the balance sheet includes accrued expenses among current liabilities — so the adjustment affects your liquidity picture too.)

2. Accrued revenue

The mirror image: accrued revenue is income you've earned but not yet billed or collected. You delivered work in the final week but won't invoice until next month — the revenue belongs to this period anyway. You debit an "unbilled receivable" asset and credit Revenue, then clear it against the actual invoice when you raise it. This keeps you from understating the period's earnings just because the paperwork lagged. It's the same earned-not-collected idea behind ordinary accounts receivable, pushed one step earlier — earned but not even invoiced yet.

3. Prepaid expenses (a deferral)

A prepaid expense is the opposite timing problem: you paid cash up front for something you'll use up over time. Pay $12,000 for a year of insurance in January and the cost of January is only $1,000 — the other $11,000 is still an asset (value you've paid for but not yet consumed). Each month, an adjusting entry moves one slice from the prepaid asset into expense: debit Insurance Expense $1,000, credit Prepaid Insurance $1,000. Without this, January looks artificially expensive and the rest of the year artificially cheap. This is the whole mechanic behind prepaid expenses and amortization, and it's structurally identical to how depreciation spreads the cost of a big asset across the years it's used.

4. Deferred (unearned) revenue (a deferral)

The fourth type is the mirror of the prepaid: a customer paid you in advance for something you haven't delivered yet. The cash is in your account, but you haven't earned it — so it's a liability, not revenue, until you do the work. Each period, an adjusting entry recognizes the slice you've now earned: debit the Deferred Revenue liability, credit Revenue. Book a year's subscription paid up front as revenue on day one and you'll overstate this period and have nothing to show next period. This is exactly the trap covered in deferred revenue for small businesses and a core part of recurring billing done right.

A note on materiality

Adjusting entries are about accuracy, not perfectionism. A $40 prepaid for an annual domain registration probably isn't worth a monthly amortization schedule — many businesses set a threshold below which they simply expense small prepaids and skip the adjustment. The goal is financial statements that are true enough to make decisions on, not entries for every rounding-level item. Spend the effort where the amounts actually move the picture.

Why this matters even though software helps

Good software automates a lot of this — it can amortize a prepaid on a schedule or recognize deferred revenue over a subscription term once you set it up. But it can't know about the wages your team earned last week or the work you delivered but haven't invoiced unless something tells it. That's why the close still involves a human pass: the value of understanding adjusting entries is knowing what to look for so the statements you sign off on are real.

Get the period-end adjustments right and your P&L finally shows the period's true profit, and your balance sheet shows what you genuinely own and owe. Hosting Books carries prepaids, deferred revenue, and accruals on schedules tied to your close, so the adjusting entries that keep your statements honest happen as part of the routine instead of being remembered — or forgotten — by hand.

This article is general educational information about accounting concepts and is not accounting or tax advice for your specific situation.