How can I change the email linked to my QuickBooks account to my new business email?

I'd be glad to help you change the email linked to your QuickBooks account, @callum-brown343-.

To change your email address, we can simply change it in your QBO account. Here's how:

1. Sign in to QuickBooks Online.
2. Choose your profile icon next to Settings ⚙ menu.
3. Select Manage your Intuit Account to go to the Intuit Account Manager.
4. Click the Sign in & security option.
5. Select the User ID, Email address, Password, or Phone section.
6. Make the necessary changes.
7. Once done, click Save.

I’m also adding a guide where you’ll see detailed instructions on how to edit the business name and tax info. It includes instructions about updating the payroll services information and QuickBooks Payment: Change your business name, contact info, or EIN in QuickBooks Online.

Please know that you're always welcome to post if you have any other concerns. Wishing you and your business continued success.