Navigate to Settings > Integrations.
Click the ⚙️cog icon to configure QuickBooks.
Click the Connect to QuickBooks button.

Log in with your QuickBooks account and allow access.

Select a default Chart of Account (COA) code from the list.
Select a default Tax Code from the list.
Click the Complete QuickBooks Integration button.
Optional settings
- Set default tax rate
Navigate to Settings > Billing > Invoice Settings.
Click the Sync button in the top right corner to resync.
Set your default tax rate.