Here are the steps you can perform to delete your QuickBooks Online account. You can cancel your QBO subscription and the system will delete all the data after a year. Within that time frame, you'll only have read-only access to see the information you've entered on that QBO account. Let me walk you through the process:
Sign to your QBO account as the admin (this will let you have the option to cancel your subscription).
Click the Settings icon and select Account and Settings.
Choose the Billing and subscription tab.
From the QuickBooks section, hit Cancel subscription or Cancel online. If you're canceling a trial, tick Cancel trial.
Follow the onscreen steps.
When finished, you'll receive an email that confirms we canceled your subscription.