How To Delete an Account From the Quicken Data File or Recover a Deleted Account
Deleting an account (checking, savings, etc.) permanently removes that account, and all of the transactions within it, from your Quicken data file. The data can only be recovered by restoring a backup. To maintain a record of the transactions without having the account show on your account list, hide the account instead.
To delete an account:
In Quicken, click on Tools on the top menu bar, then choose Account List (or hold down Ctrl+A on your keyboard).
Select the account you want to delete, and then click Delete.
To delete the account, you must type YES in the Are you sure you want to delete this account window, and then click OK.