I want to ask whether we can customize the QuickBooks Chart of Accounts to use a 36-digit account number.

Hi there, Babar. QuickBooks Online has a built-in restriction on account numbers, limiting them to a maximum of 19 characters. This limit applies across all account types, subscription plans, and versions of QBO.

If you try to enter an account number that exceeds 19 characters, the system will not accept it. Instead, it will automatically revert to the previously saved account number when you attempt to save the update.

To ensure smooth integration and functionality, users should align their account numbering system with this restriction.

If you have any additional questions, feel free to comment below.