To create a smart for invoices with tax follow the below instructions.
From the BusinessMind home page click on the Sales link.
From the Sales home page locate the View Invoices section and click on the +New SmartSet Query link.
Modify the smart set name to your needs.
Select the columns you would like to appear; We recommend the Total Tax column.
Set your date range in your search
You can choose to only run this search from invoices. To do so add the invoice number to your search critera as per the screen shot below.
Save and run your smart set which will display the sales tax on sold invoices.