Generate the tax rate information you need. This service uses a US ZIP code or Canadian postal code to get the general sales and use tax rate levels for the state, county, city, metropolitan transit authority (MTA), special purpose district (SPD), and more. You'll know about multiple tax jurisdictions within a single ZIP code (where county boundaries cross a ZIP code, for example), and also multiple levels of tax rates such as MTA and SPD data and four “other” tax rate fields.