The India VAT tax calculating system is used by Enquiries, Quotations, Orders and Invoices module. Tax rates are filled in as per government rules for the current fiscal year. These rates can also be modified at any date if the government changes the tax rates after you have configured Webhuk initially. The India VAT module also generates statutory documents required for filing sales tax and service tax returns.
Further reading: Generating Statutory Documents, Modifying Tax Rates