QB Issue Resolution:

If you’re a new customer and are within the first 60 days of having set up your account, you can delete all of the existing data and start over from scratch. If your account has been setup for more than 60 days you will need to cancel your current company and start a new company in order to start from scratch.

To complete the process, follow the instructions below:

Log in to your QuickBooks Online company.
Change the URL to include /purgecompany instead of /homepage

EXAMPLE:

URL shows: https://qbo.intuit.com/c27/app/homepage
Change to: https://qbo.intuit.com/c27/app/purgecompany

Resolution for Issue 'I want to delete all the information hosted until now on quickbooks. How can I do it?' available: Yes (Solved).
Source: Intuit Community forum.

I want to delete all the information hosted until now on quickbooks. How can I do it?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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