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Avalara Help Center

How do I avoid a QuickBooks error CB-201 when calculating tax?


An error message with the text "CB-201" is displayed when trying to access the AvaTax service and you want to know how to avoid it.




  1. Ensure that all the AvaTax dialogue windows are closed.  If the issue continues, you'll want o
  2. Close QuickBooks, end all the QuickBooks processes in Task Manager
  3. Look for AvalaraEvenCallback.dll in Task Manager and if present  end it
  4. Restart QuickBooks and process transactions.
  5. For QuickBooks 11 and higher, uncheck Keep QuickBooks running for quick start, found under Edit >Preferences in the General section
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