Audit reasonableness testing is the audit technique or procedure used to assess the reasonableness of accounting transactions, events, or balance that records in the financial statements by auditors by using two or more different sources of data or information to predict accounting transactions or events.

The audit reasonableness test is also one of the most popular analytical procedures to test the types of expenses that regularly happen and record in the income statement.

The main principle of this technique is using one event or transaction to predict or assess the reasonableness of others that have a connection with it.

For example, the cost of goods sold has a strong connection with sales revenues and inventories.

The auditor might use inventories data or cost of goods sold data to assess the reasonableness amount of revenues that records in the financial statements.

Other examples are depreciation expenses or utility expenses. We will explain your detail in this article on how, and why and when you use the reasonableness test.


For example, you are assigned to perform auditing testing in many cycles. One of those cycles is fixed assets.

Basically, before you perform the substantive testing on fixed assets that report in the financial statements, you are supposed to understand the key controls of an entity related to fixed assets.

Those controls will be included from the management level of authority on purchasing fixed assets, fixed assets control, and depreciation calculation. Once you complete your understanding, you will decide whether to test on the key control or not.

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Understanding the key internal control related to the cycle you are testing is a very important part of the success of reasonableness testing. The reason is if you don’t fully understand, you probably miss interpret the result of your testings.


Let say you decided to test the control, and some of those control include purchasing authority and depreciation.

Now, let assume that the depreciation charge in the financial statements is in the correct ways and control on the depreciation is concluded to be okay.

Now let start reasonableness test,

As you know reasonableness test is part of substantive procedures and now let use reasonableness test to confirm if reasonably fixed assets expenses recorded in the financial statements are correct or not

We assume you understand what are depreciation expenses and how they are charged to the income statement.

Now let start testing,

Basically, we know that fixed assets’ depreciation expenses are charged in a systematic way, right?

Once we figure out how those systematic ways are, for example, using the straight-line method, then we need to perform independence calculation of depreciation expenses and then predict what are the total expenses for the whole year.

But before you compare the expected expenses with actual expenses in financial statements, you should project the threshold on how much different we will accept and how much we will investigate.

This is how to audit reasonableness test work.

Remember, the reasonableness test is the kind of audit testing that lets auditors understand the reasonableness of balances and amounts of events and transactions that records in the financial statements.

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However, another testing like inspection, vouching and observation still need to be performed if required.

By Sinra