How can I find the total tax I have taken on my orders?

The  Orders Summary Report contains a tally of the total amount of tax taken on all orders within a specific time period. 

If you also need a breakdown of taxable and non taxable sales, the  Orders Taxable Status Report provides this level of additional detail.

To find tax taken by country and state, see your  Orders by Customer Location Report.

Depending on your connected Integrations, tallies may include tax already remitted on your behalf to authorities.