1.ST-3
2. Two documents you received from NJ Department of Taxation.
3. MA Sales Tax Agreement.
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You can also download Business Registration Certification if you did not receive it, from
http://www.nj.gov/treasury/revenue/busregcert.shtml
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BUSINESS REGISTRATION CERTIFICATE A Business Registration Certificate serves two purposes: For public contracting, as proof of valid business registration ...
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Basically, just click on
obtain a certificate online, and just filled in Tax ID and business name, it will generate a page of certificate.