In RainMaker you can view a financial report to show any tax collected within any date range you choose. The report can break down tax into categories of tuition and anything other than tuition. You will also get a transaction breakdown list to show how the number was calculated. You can export this report into a CSV file.  

The Tax report can be found by clicking on "Reports" on the top right hand of the homepage navigation bar. On the Reports page it is located under the Financial Reports section on the top righthand side.