These errors can be sub-divided as follows:
- Errors of omission: When a transaction is either wholly or partially not recorded in the books, it is an error of omission. It may be with regard to omission to enter a transaction in the books of original entry or with regard to omission to post a transaction from the books of original entry to the account concerned in the ledger.
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- Errors of commission: When an entry is incorrectly recorded either wholly or partially-incorrect posting, calculation, casting or balancing. Some of the errors of commission effect the trial balance whereas others do not. Errors effecting the trial balance can be revealed by preparing a trial balance.
- Compensating errors: Sometimes an error is counter-balanced by another error in such a way that it is not disclosed by the trial balance. Such errors are called compensation errors.