Can a client view their invoices online?

Hi @clarke01 , you could adding user to your qbo. It's depend what your type subscriptions (please click here ). To add user ;

1. Users.
2. Click the New button on the right.
3. In the Choose user type page, select Regular or custom user. Click Next.
4. Select Limited, then put a check mark on the Customers and Sales box. Click Next.
5. Set the users admin rights, click Next.
6. Enter the new user's e-mail address and name, click Next and then Finish. 

Another alternative is just see the invoice in offline (sent by email). Comment back, cheers.

Hi, clarke01.

Thank you for reaching out to the QuickBooks Community. With QBO you have access to several different ways to share your customers invoices.

Check out this article to view all the different ways available to you: Send an Invoice. I'm here as well to help with any questions you may have. Simply reply below at any time to reach me.

is there a way to disable a customer's ability to view the invoice prior to it being sent?