The CSV solution doesn't work to import and IIF file.  As far as I can tell, the CSV format only supports 3 or 4 columns and will only upload into a single account in Quickbooks Online.  IIF files import splits into multiple accounts.

Am I interpreting this correctly?  If so, that solution doesn't work.

Please add .IIF import to the product roadmap.  It's just simply unacceptable that Intuit doesn't support it's own format in QBO.

Also, how is it possible that QBO doesn't support export to TurboTax for Business (also an Intuit product).  this is just unacceptable.  

If this is the case, will not be switching to QBO