Correction
Using the same accounting method can help comparisons, but it does not make different situations alike. Useful comparisons preserve relevant differences as well as similarities.
Distinguish the two terms
Consistency means keeping an accounting method stable for similar events across reporting periods or entities. Comparability helps readers identify similarities and differences. Consistency supports that goal; it is not a guarantee that every reported amount can be compared directly.
Compare a standalone example
Harbor Design and Meadow Design both use straight-line depreciation for their printers. Harbor uses its printers for long daily production runs; Meadow uses its printers occasionally for proofs. Applying the same method does not prove that the printers should have identical useful-life estimates.
A reader should understand the different use patterns and the estimates supported by each company's facts. Making both estimates identical solely to produce matching expenses would hide a difference instead of explaining it.
Check your answer
Before comparing expenses, check the period, asset use, method, and estimates. Explain the differences that affect your conclusion. Do not call two reports comparable merely because their account names or methods match.
The Financial Accounting Standards Board distinguishes these ideas in Concepts Statement 8, Chapter 3, QC21–QC23.
When this mistake may appear
- Companies use the same accounting method.
- A comparison spans periods with different business conditions.
Your work may contain this mistake if:
- Treats matching labels as proof that the amounts are comparable.
- Ignores differences in how the companies use their assets.
- Changes an estimate only to make two reported amounts match.