Find information about contracting with Hennepin County, including processes, forms, and diversity rules for goods and biddable services. You must register to collect sales tax if you make taxable retail sales in Minnesota.This includes sellers outside Minnesota who:. This Convention governs only the formation of the contract of sale and the rights and obligations of the seller and the buyer arising from such a contract. (l) In the case of a conditional sales contract, a retail sale occurs upon the transfer of title or possession of the tangible personal property. Use our online calculator to determine the correct State Deed Tax (SDT) amount (the tax is . The purpose of the CISG is to provide a modern, uniform and fair regime for contracts for the international sale of goods. In 12 hours — PURCHASE AGREEMENT. Sales Tax applies to most retail sales of goods and some services in Minnesota. Ensure compliance with Hennepin County Purchasing Rules and Minnesota Statutes.