What it means
Financial statements can contain mistakes, such as a miscalculated depreciation charge, an invoice recorded in the wrong year or a misapplied accounting rule. When the error is small, it is usually corrected in the current period.
When it is material, meaning large enough to change decisions of a reasonable reader, accounting standards generally require the earlier period to be restated. The restatement works by correcting the comparative figures and adjusting the opening retained earnings (the accumulated profits kept in the business).
The current year's income statement is not distorted by an old error. Readers can then compare like with like.
Prior period adjustments are different from changes in accounting estimates, such as revising how long an asset will last. Those are handled going forward and do not rewrite history.
They also differ from normal year-end accruals, which are expected adjustments made before the books are closed. For managers, the consequences go beyond the numbers.
Lenders may rely on covenants (promised financial ratios), so a restatement that reduces earlier profit could cause a breach. Investors may lose confidence, and tax filings for earlier years might need amendment.
Strong controls are the best defence. Regular reconciliations, review of unusual entries and a clear policy on materiality reduce the chance of an error surviving to the year end.
When one is found, the finance team should document its cause, its size and the correction, and inform auditors promptly. Disclosure is part of the process.
The notes to the statements normally explain what the error was, which periods were affected and how each line item was changed. This transparency lets readers judge whether the problem was an isolated slip or a sign of weak controls.
In practice
Real-world examples
Example 1
A construction company discovers that it recorded a $120,000 equipment purchase as an expense rather than an asset two years ago. The finance team restates the earlier statements, capitalises the asset and adjusts opening retained earnings.
Example 2
A retailer finds that an inventory count error overstated stock by $75,000 at last year's end. Because the amount is material to profit, it corrects the comparatives and opening balances rather than reducing the current year's gross margin.
Example 3
A software firm learns that it recognised a $200,000 subscription as revenue immediately rather than over twelve months. It restates the prior period, discloses the nature of the error and explains the effect to its auditors and lenders. The lenders confirm that the covenant calculations still pass after the restatement.
Think of it
Imagine you are tracking your personal weight loss over five years, but you realize your bathroom scale was broken during year two and always showed you five pounds lighter. Instead of pretending you gained five pounds this month, you go back and correct the old log so your long-term progress makes sense.
Formula
Calculation
Adjusted opening retained earnings = reported opening retained earnings - after-tax effect of the error
Suppose depreciation was understated by $40,000 in the prior year, and assume a 25% tax rate. The after-tax effect is 40,000 x (1 - 0.25) = $30,000. Reported opening retained earnings were $500,000. The adjusted opening balance is 500,000 - 30,000 = $470,000, and the prior year's comparative profit is also reduced by $30,000. The current year's profit is unchanged by the correction, which is the whole point of restating the comparatives.Case study
Seen in the real world
Tidewell Components is an illustrative, fictional manufacturer whose new controller found that a machine had been depreciated over five years when its useful life was ten. The error had run for three years and overstated expenses by $60,000 in total.
The company judged the amount material because it affected a loan covenant on profitability. It restated the comparative figures, increased opening retained earnings by the after-tax amount, and wrote a clear note describing the correction. The illustrative outcome was that lenders accepted the explanation, and the company introduced an annual review of asset lives to stop the issue recurring.
The auditor tested the restated figures and agreed with the approach. The board asked the finance team to report any similar issues quarterly for a year. The illustrative result was that confidence returned, because the company had found and fixed the problem itself.
Watch out
Common mistakes
- Burying a material old error in the current year's expenses, which distorts both years' results.
- Treating a change in an estimate as an error, when estimates are revised going forward without restating the past.
- Forgetting the tax effect of the correction, which changes the amount posted to retained earnings.
Questions
People also ask
When is an error material enough to require restatement?
An error is material if it could influence the decisions of users of the statements, and judgement considers its size and nature.
Does a prior period adjustment affect the current year's profit?
It should not, because the correction goes to opening retained earnings and the restated comparatives.
Who needs to be told about a restatement?
Auditors, lenders, investors and tax authorities may all need notice, depending on the contracts and rules involved.