ST-121 3 2026

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The document ST-121.3 is an Exempt Use Certificate for Computer System Hardware issued by the New York State Department of Taxation and Finance. It allows purchasers to claim exemptions from state and local sales and use taxes for specific computer hardware used in software design and development, including web services. The form must be completed by the buyer and provided to the seller, detailing the exemption being claimed. It also outlines penalties for false claims and provides instructions for proper use.

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