How to obtain tax id
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Obtain a FEIN (Federal Employer Identification Number) from the Internal Revenue Service, if you have employees. Some states, like Minnesota, require this number of those applying for a sales permit. Other states, like Texas, will issue a temporary sales permit number until the applicant secures a FEIN. You can apply online, over the phone, via fax or by mail (see Resources). You will receive the number instantly if you apply online or over the phone, in four days if you apply by fax and in up to six weeks if you apply by mail.
Complete an application for a sales tax ID in your state. This form may be available from your state's department of revenue website. If not, you may be able to request it over the phone or pick it up from a local office of your state's department
Gather supporting documents. Basic information includes your name, Social Security number and the name of your business. Any other required information will vary by state. For instance, Minnesota requires an NAICS (North American Industry Classification System) code, while California needs the name and address of every bank in which you have a business account.
Submit the application with the supporting documents requested. You may mail it to the address given on the application or submit it in person at the office.
Wait for your permit to arrive in the mail. The permit will have your state tax ID number. The processing time will vary by state.
Register your business with your state, if you have not already done so. If your state does not issue separate seller's permits, the number on the business license you receive will be your state tax ID number.Source: ehow.com