It's a bookkeeper's worst nightmare!  Your balance sheet doesn't balance!  
Everything is database driven with QBO, so this sometimes does happen.  The first step is to find what transaction(s) caused everything to go out of balance.

Try to narrow down the date that it is out of balance.

  1. Run a Balance Sheet
  2. Customize the report to display columns by Month
  3. Once you've identified the month that is out of balance, display columns by Week
  4. Then display columns by day.
  5. Review the transactions for that day which either are the exact balance for which you are out, or have entries which don't balance.

Updated: March2017