Thanks for posting here in the Community forum, Mac.
Please know that we can't delete a bank account in QuickBooks Online, but we can make it inactive.
If the account is connected, I recommend disconnecting it first. This will delete any pending transactions while keeping all recorded entries unchanged.
Here's how to make it inactive:
- Click the Gear icon and select Chart of Accounts.
- Locate the bank account you want to deactivate and hit the Account history dropdown.
- Select Make inactive.
- When prompted, click Yes, make inactive to confirm.

Feel free to return to this thread if you have any concerns. We're here to help.