N.Y. Comp. Codes R. & Regs. tit. 20, § 541.1
(b) The principal distinguishing feature of a sale to a contractor, as compared to a sale to other vendors who purchase tangible personal property for resale, is that the sale of tangible personal property to a contractor for use or consumption in construction is a retail sale and subject to sales and use tax, regardless of whether tangible personal property is to be resold as such or incorporated into real property as a capital improvement or repair. Whenever a contractor uses materials, on which the contractor has paid sales tax, in a repair or maintenance contract (except interior cleaning and maintenance contracts of 30 days or more) subject to the sales tax on services under section 1105(c) of the Tax Law, the contractor may be entitled to a refund or credit of the portion of the tax he paid attributable to the materials transferred to the customer.
Cross-reference:
For refund or credit, see section 534.5 of this Title.
(c) Receipts from the performance of a capital improvement to real property by a contractor are not subject to the sales tax.
Cross-reference:
For additional information on capital improvements and repairs see section 527.7 of this Title.
(f) Corrective work receives the same tax treatment as the original work to which the corrective work relates. Thus, for example, if the original contract was a capital improvement and the contractor is required to repair windows broken in installation to make the work acceptable to a customer, the repair is considered a part of the original capital improvement contract.
(2) Where a contractor services real or tangible personal property and a charge is made to the customer, the charge is subject to the tax even though some of the work is performed partially under a guarantee or warranty.
(3)
(g) Guarantee and warranty work.
(h) A contractor purchasing an existing business, or any portion of a business, or its assets, from a person required to collect tax is subject to the bulk sales provisions of the Tax Law. See Part 537 of this Title for complete information on bulk sales.
Cross-reference:
For detailed explanation of the application of the compensating use tax and the available or reciprocal credits, see Part 531 of this Title.
Tax Law, §§ 1101(b)(4); 1105(c)(2), (3), (5); 1115(a) (15), (16); 1119 (c)
(a)