Can I change my current QB account from Sole Trader to Limited? Bank details etc are already separate and VAT set up so the main business details won't need to change.

Hey Lewis_w61, 

You can change the company type in the advanced settings by going to the Advanced settings (Gear icon > accounts and settings > advanced > company type).

The company type is selected during the set-up of a new account, and quickbooks will generate the default chart of accounts based on the selection here, however changing the company type after you have setup the account will not change your existing chart of accounts.