Quick Balance Checking Normally these should be checked at least once a month. If you do hundreds of transactions a day or week, then check more often. Things get out of balance usually thru machine interruptions while a file is being updated. Power failures, network lockups, etc. The trial balance may also get out by intentionally posting a journal entry out of balance. You are always warned but you can still do it. This is to allow doing a onesided entry to get back in balance. Finding and correcting a Trial Balance that is O/B (Out of Balance) First, Go to the G/L Reports and run a Trial Balance on previous months until you find the month that is first out of balance. This helps pin down when it becamoe O/B. The amount O/B may correspond to something you remember, a check, payment, invoice, etc.