Hi there andie787,
In order to have your books well balanced, it's key that your transactions have the correct amount of tax added. QuickBooks Online is a great tool that can add up the taxes on sales and expenses in order to calculate the amount owed on your next return. I can provide some information about default taxes.
The default tax rate selection is a default selection to be applied to all transactions, whether they affect suppliers or customers. You can choose to select that all transactions are inclusive or exclusive of tax by default. There isn't a way to have certain types of transactions have one default setting whereas other transactions have the other default setting. I can see how having certain transactions be inclusive of tax by default and other transactions exclusive of tax would be a feature that would help you with managing your sales and expenses in QuickBooks Online. I recommend using the steps that my colleague Tammy put in her last response in order to enter feedback to request the feature. Comments made in the feedback section are taken into consideration by our development team when designing new features for QuickBooks Online. I'll pass along your feedback on my end as well.
If you have any other questions, feel free to reach out here.
