Classification of Errors

Errors in accounting are not all alike. A wrong amount posted to the correct account is a very different mistake from recording a revenue expense as a capital expenditure. To handle them properly, we classify errors into four categories. Each category has a distinct nature and, as you will see in later sections, a distinct method of correction.

1. Errors of Commission

These are errors where the transaction has been recorded, but the recording is incorrect in some detail. The basic double-entry has been performed, but one or more of its elements is wrong.

Common examples include:

• Posting the correct amount to the correct side of the wrong account.
• Posting a wrong amount to the correct side of the correct account.
• Totalling a subsidiary book (like the Sales Book) incorrectly.
• Balancing an account wrongly.
• Entering the correct amount on the correct side but in the wrong account.

The key point is that the transaction has been entered into the books; the mistake is in the execution of the entry.

2. Errors of Omission

These are errors where a transaction is completely or partially left out of the books. The mistake is one of non-recording.

There are two types:

• Complete Omission: The transaction is not recorded in the journal or subsidiary book at all. Neither the debit nor the credit appears anywhere in the ledger. The trial balance will still agree, but both accounts are wrong.
• Partial Omission: The transaction is recorded in one book but not posted to the ledger. For example, a credit sale is entered in the Sales Book but the customer's personal account is never credited. The trial balance will not agree because one side of the entry is missing from the ledger.

3. Errors of Principle

These are the most fundamental errors. They occur when a transaction is recorded in violation of the basic accounting principles — specifically, the distinction between capital and revenue items.

For example:

• Treating a revenue expense (like repairs to a machine) as a capital expenditure (debiting the Machinery account instead of the Repairs account).
• Treating a capital receipt (like the sale of an old asset) as a revenue receipt (crediting the Sales account instead of the Asset account).

The double-entry is complete, and the trial balance will agree. However, the financial statements will be materially wrong. The profit will be misstated, and the value of assets and liabilities on the Balance Sheet will be incorrect.

4. Compensating Errors

These are two or more errors that occur in such a way that their net effect on the trial balance is zero. One error cancels out the other.

For example:

• The Purchases account is overcast (total is too high) by ₹1,000.
• The Sales account is also overcast by ₹1,000. …