The typical reason for a Balance Sheet not balancing is due to the misclassification or due to an unclassified account in Bookvalu.
It is a good idea to review each Account Classification within Bookvalu to make sure that a QuickBooks account is being classified correctly. We have done our best to make sure that accounts are automatically classified correctly. There are however times where some classifications may be incorrect and need to be re-classified.
There are usually one or two tags listed after each account in the Accounts Classification section as shown below. This of these two tags as hints based on the way your QuickBooks Online accounts are listed in your Chart of Accounts.
If something doesn't look as though it is classified correctly, double-check your Chart of Accounts to make sure that it is correctly classified in QuickBooks Online itself.
To do so, log in to your QuickBooks Online account and open up the Chart of Accounts. From there, specifically, review the "Type" and "Detail Type" fields to ensure they make sense.
If you have any issues or have further questions, contact Support.