does the accountant have access to my bank account number and can he see

Accountants added to your QuickBooks Online (QBO) account cannot view your full bank account numbers, tacomacopy.

While they have access to perform financial tasks such as entering transactions, managing invoices, and running reports, QBO's security measures ensure that sensitive information, including complete bank details, remains protected.

You can also check out this article to learn more about what accountants can do if they're added to your QBO account: Add accountant users for your company.

If you have any additional questions about QuickBooks Online, feel free to reach out anytime!