Currently rolling-out across Google Play is version 1.2 of Quick Quote Professional, which allows you to add tax amounts to your quotations and estimates. You can specify any number of percentage tax rates, and the total is calculated automatically.
Quick Quote is an easy-to-use quotation and estimate calculator for Android phones and tablets. Enjoy the free version for as long as you want, with no limits on how many quotes you can store. This new tax feature is only available in the paid-for version.