Section 370.120 - Receipt of reports, returns and remittances sent by mail1. Any report, return or remittance to cover a payment required by NRS 370.001 to 370.430, inclusive, which is transmitted through the United States mail, shall be deemed filed or received on the date shown by the postmark stamped upon the envelope containing it, as provided in NRS 238.100, or on the date it was mailed if other proof satisfactory to the Commission establishes that it was timely deposited in the United States mail, postage prepaid and properly addressed to the Commission.2. The date on a receipt for material sent by certified or registered mail, if different from the postmark, prevails if the date on the receipt is earlier than the date of the postmark.3. A record authenticated by the post office that the postmark on certain batches of mail was erroneous is proof satisfactory to the Commission that the mailing was made on a date other than the date of the postmark.4. If it is known that the postal service was inoperative at a certain time because of a strike, riot, warfare or act of God or for some other reason, the Commission will consider the circumstances, and if there is other evidence of timely mailing, will accept the evidence and deem the return or payment timely.5. A postmark affixed by a postage meter in the possession of the taxpayer or other person outside the post office will be disregarded as proof of the date mailed whenever it is contradicted by an official postmark stamped upon the envelope containing the payment. Unless corroborated, statements by a taxpayer or the taxpayer's employees are not sufficient to refute the postmark as the date of mailing.Nev. Admin. Code § 370.120
Tax Comm'n, Cigarette Tax Reg. part No. 6, eff. 7-24-70; A 10-9-71-NAC A by Dep't of Taxation, 10-10-83