When you open the Begin Reconciliation window and select an account to reconcile, the opening balance is zero or incorrect.
This issue can occur for several reasons:
If this is your first time to reconcile the account and you entered an incorrect balance or if you did not enter an opening balance at all when you set it up, your beginning balance will be incorrect or zero. You cannot edit the opening balance in the Reconciliation window. However, you can create the opening balance with a journal entry then do a mini-reconciliation.
Run a Reconcile Discrepancy report:
Run an Audit Trail report;
Run a Previous Reconciliation report:
To correct the discrepancy, you may need to:
Since reconciliation works quite differently in QuickBooks for Mac and QuickBooks Online, some transactions may get unreconciled and your opening balance is affected.
To know more:
If you converted from Mac, click here.
If you converted from QuickBooks Online, click here.
Occasionally, your data file may be damaged or corrupted.To fix the problem, try to use rebuild and verify data utilities.