can i add tax codes to expenses so that I don't have to add it each time?

To automate Canadian sales tax tracking for expenses, go to your Chart of Accounts and map default tax codes directly to specific general ledger accounts. For electronic entries, you can also set up automated banking rules within QuickBooks Online. This prevents the need to manually choose a tax code for every transaction.

Here's how:
 

1. Go to the Gear icon in the upper right corner of your dashboard and select Chart of Accounts.
2. Check the boxes on the left-hand side next to the specific expense accounts you want to automate.
3. Click the Batch actions dropdown button located at the top of the account grid.
4. Select Set default Tax code from the dropdown menu, choose your required Canadian regional tax code.

For guidelines on the Bank Rule feature, please refer to this article: Set up bank rules to categorize online banking transactions in QuickBooks Online.

Feel free to click the Reply button if you have other questions about QuickBooks.