Hello there, roger.

When you run both reports in QuickBooks Online (QBO) within the same date range, there shouldn't be a discrepancy between the two. 

You'll need to run a cash Balance Sheet and Statement of Cash Flow report with the dates aligned together to locate the entries making a disparity.





Also, check out this resource for more information on how to personalize the data reflected in your reports: Customize reports in QuickBooks Online.

Should you have follow-up questions or need further assistance running specific reports in QBO, feel free to notify me by leaving a reply below. 

@roger-weber 

There shouldn't be a difference as long as your dates align on both reports.  If there's a difference (and your balance sheet balances), then the issue is with QB.  Are you able to run the reports at the end of the previous month to see if your cash balance matches then.  How about the prior month-end?      

Mystery solved.  I found a transaction that hit the undeposited funds account at yearend. It had a date problem.  When I fixed the dates, the reports are working again.  Thanks for your help.