What it means
When running a business, you occasionally need to change how you record financial transactions, or you might discover a mistake in previous financial statements. IAS 8, which stands for International Accounting Standard 8, provides the official playbook for handling these situations.
It splits changes into three distinct categories: changes in accounting policies, changes in accounting estimates, and the correction of prior period errors. A change in policy happens when you switch from one standard accounting method to another, such as changing how you value your inventory.
IAS 8 usually requires you to apply this new policy retrospectively, meaning you must rewrite past financial statements as if you always used the new method. This allows investors to compare apples with apples when looking at performance across different years.
Changes in estimates, like guessing how long a delivery van will last or predicting bad debts, are treated differently. Because estimates rely on future unknowns, you handle these prospectively, adjusting the numbers only for the current and future periods without rewriting history.
Finally, when genuine errors from past years come to light, IAS 8 demands that you fix them immediately by restating the comparative figures. For non-finance managers, understanding IAS 8 matters because it protects the integrity of your company numbers.
If you alter accounting methods without following these rules, your financial reports lose credibility with banks, investors, and tax authorities. Compliance ensures transparency and maintains trust in your business reporting.
Think of IAS 8 as the rulebook for editing a scoreboard in a sports league. If the referee realises a rule was interpreted wrongly all season, past scores must be recalculated.
But if a player's expected running speed is just adjusted for the next match, you only change future expectations.
In practice
Real-world examples
Example 1
TechStart switched its revenue recognition policy to match new industry standards. Under IAS 8, the founder had to restate the previous year's revenue figures so investors could fairly compare performance. The notes to the accounts explained what changed and by how much.
Example 2
GreenDelivery realised it had completely missed a $9,000 utility bill from the previous financial year. Following IAS 8, the SME corrected this prior period error directly in the comparative financial statements. It also disclosed the amount of the correction for each affected line item.
Example 3
Metro Logistics reviewed its forklift depreciation estimates and found the machines wear out faster than expected. Under IAS 8, it applied this estimate change prospectively, so only current and future years carry the higher depreciation charge. Earlier reported profits were left exactly as published.
Think of it
Think of IAS 8 as the rulebook for editing a scoreboard in a sports league. If the referee realizes a rule was interpreted wrongly all season, past scores must be recalculated. But if a player's expected running speed is just adjusted for the next match, you only change future expectations.
Formula
Calculation
Restated Opening Retained Earnings = Original Opening Retained Earnings + Retrospective Policy Adjustment - Prior Period Error Correction. For a change in estimate, nothing is restated: the Remaining Carrying Amount is simply spread over the Revised Remaining Life.
Example 1, prior period error: retained earnings were originally $100,000. A past expense error of $15,000 is discovered, so the restated opening balance is $100,000 - $15,000 = $85,000.
Example 2, change in estimate: a van costing $60,000 with no residual value and a five-year life is depreciated at $12,000 a year. After two years its carrying amount is $60,000 - $24,000 = $36,000. If the business now expects only two more years of use, the new charge is $36,000 / 2 = $18,000 a year, applied from now on with no restatement of earlier years.Case study
Seen in the real world
This is a fictional, illustrative scenario. Brighton Bakeries, a growing regional bakery chain, prepared its annual financial statements and discovered a significant oversight. For the past two years, the company had been incorrectly capitalising minor equipment repairs as long-term assets instead of treating them as immediate operating expenses. Under IAS 8, this qualified as a prior period error rather than a change in estimate.
The finance team could not simply sweep the correction into the current year because doing so would artificially deflate current profits and make past reports misleading. Instead, Brighton Bakeries applied IAS 8 by recalculating the financial statements for both preceding years. They reduced the asset values and lowered the opening retained earnings by $40,000 to reflect what the expenses should have been. When the revised accounts were published, the notes clearly explained the nature and size of the correction.
This transparent approach preserved the trust of their lending bank, ensuring continued credit facilities without regulatory penalties. The $40,000 was made up of $25,000 of repairs from the first year and $15,000 from the second, ignoring the small depreciation previously charged on them. The finance director also tightened the capitalisation policy, setting a clear threshold so that routine repairs would be expensed as they happen. A short training session for site managers explained the difference between repairing an oven and replacing it.
Watch out
Common mistakes
- Treating a change in accounting policy as a change in estimate to avoid the hassle of rewriting past figures.
- Hiding past accounting errors in the current year income statement instead of restating comparative prior periods.
- Failing to disclose the financial impact of a new accounting standard in the notes to the financial statements.
Questions
People also ask
What is the main difference between an accounting policy and an accounting estimate?
An accounting policy is a specific principle or rule used to prepare financial statements, such as a depreciation method. An estimate is a measurement approximation based on current information, like the useful life of an asset.
Why do we have to rewrite past figures when changing a policy?
Rewriting past figures ensures that financial statements remain comparable over time. If a company changes how it counts revenue, past years must use the same method so trends are genuine.
Are corrections of errors treated differently from changes in estimates?
Yes. Errors from past periods must be corrected retrospectively by fixing prior year numbers. Changes in estimates are applied prospectively, affecting only current and future periods.