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Frequently Asked Questions on the Sales Tax Zero Filing System 1. Are there any special Web browser requirements to use the Sales Tax Zero Filing System?

April 26, 2017browser filing requirements special system web Zero

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Frequently Asked Questions on the Sales Tax Zero Filing System 1. Are there any special Web browser requirements to use the Sales Tax Zero Filing System?

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You will need either Netscape 4.0 (or higher) or Internet Explorer 3.02 (or higher) to use the online application. A zero sales tax return can also be filed by phone at (303) 205-TAX0 (8290). 2. Do I need to register to use the Sales Tax Zero Filing System filing application? No. You must have a valid Colorado sales tax account number, but no additional registration is necessary to use this online application. Your Colorado sales tax account number is printed on your sales tax license and sales tax return and allows you to access the system.