It allows to create, edit and store the legal requisites of your clients and partners. You can set the VAT rate, which is deducted in accordance with the law, and the system will automatically charge the rate during creation of the deals.
You'll be able to view the price in documents both including the VAT and without it. You would need to install the app, under which the output is required, to show the requisites. You may need to display the legal requisites field in the interface, depending on the app.