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Based on your information - you qualify for the exemption from sales tax as an occasional sale.See following documents posted by the comptroller
(a) Sales exempt. A taxable item that is sold or purchased by way of an occasional sale is exempt from sales and use taxes, except as provided by subsection (i) of this section.
b) Occasional sales by persons not in the business of selling, leasing, or renting.
(1) One or two sales of taxable items, other than an amusement service, during any 12-month period by a person who does not hold himself out as engaged (or who does not habitually engage) in the business of selling taxable items are occasional sales.
Following is the statement you need to submit
Please also see here
Occasional sales include:• one or two sales of taxable items, regardless of price, during any 12-month period (Texas Tax Code Section151.304(b)(1)); or• sales totaling up to $3,000 in a calendar year of items that were originally acquired for personal use by the personor a family member of the person selling them (Tax Code Section 151.304(b)(5)).
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