Every person making a casual sale of items subject to New York State and local sales taxes must file this form. This bulletin explains the sales tax filing requirements for quarterly, partquarterly (monthly), and annual filers, including the Efile mandate.If you plan to sell devices purchased from us in New York State, we require that you fill out and esign the ST120 form. This guide will explain New York's sales tax system in simple terms to help you file correctly and avoid penalties. Currently, combined sales tax rates in New York range from 4 percent to 8.875 percent, depending on the location of the sale. What businesses need to know about completing a sales tax return in New York: how to prepare a return and when to file to stay compliant. Download Form DTF17, Application for Sales Tax Registration. Fill out the form with all the necessary information about your business. The property and improvements which the Seller is agreeing to sell and which the Purchaser is agreeing to purchase is known as. In most states, sales of intangible assets – goodwill, IP, trademarks, etc.