Sales tax must be collected by the retailer, or paid by the service provider, on sales to entities that have not provided an exemption certificate to the retailer or service provider, and on sales of tangible personal property or services that are not related to the activity identified on the certificate issued to the entity. Retailers and service providers must maintain in their files a copy of the exemption certificate issued to any exempt organization to which they make a tax-exempt sale. Separate invoices of all tax-exempt sales must be retained by the retailer or service provider and appropriately marked. The words "Maine Sales Tax Exempt" or "Maine Service Provider Tax Exempt," together with a notation of the applicable exemption number, will satisfy this requirement.
Regardless of the specific method of payment, are tailer or service provider is not relieved of its burden of proving that a sale is exempt if it has, at the time of the sale, knowledge of facts that give rise to a reasonable inference that the purchaser is not the holder of the exemption certificate, that the exemption certificate has been revoked or is otherwise invalid as of the time of the sale, or that the tangible personal property or service is not to be used exclusively by the exempt organization primarily in the activity identified on the exemption certificate.
Notwithstanding the previous paragraph, sales made to authorized employees or representatives on behalf of exempt organizations that are paid for with cash, personal check, personal credit card, or personal debit card may be made tax-free if a magnetic customer card issued by the retailer or service provider to the exempt organization and identifying the organization as tax-exempt is presented at the time of the sale by the authorized individual making the purchase and is recorded electronically by the retailer or service provider. The retailer or service provider must retain the digital information identifying the transaction and the purchaser. The customer card must:
18-125 C.M.R. ch. 302, § 4