Glass and Glazing Deductions: The Glass Inventory, the Cutting Table and the Racks on the Van, the Impact Windows Florida Buys by the Thousand, the Auto Glass That Is a Taxable Repair, and the Specialty License

Glass work spans three businesses that often share a shop: installing windows, storefronts, and shower enclosures into buildings (real property work), replacing auto glass (a taxable repair of tangible personal property), and selling cut glass and mirrors over the counter (retail). Florida's sales tax treats each differently, and a glazier who runs all three keeps three kinds of invoices. In South Florida the first line is dominated by impact-rated windows and doors, bought by homeowners in volume and sometimes with state grant money.

The three-way sales tax split

| Work | Florida treatment | |---|---| | Installing windows, doors, storefronts, shower enclosures, or mirrors into a building under a lump-sum contract | Real property improvement: the glazier pays tax on the glass and frames at purchase and charges the customer none; labor not taxed | | Same work under a retail-sale-plus-installation contract (material itemized at retail, installation separate) | The glazier collects tax on the material's retail price; buys tax-free for resale; installation labor not taxed when separately stated | | Auto glass replacement or repair | Repair of tangible personal property: the whole charge, parts and labor, is taxable, including insurer-paid jobs; the glazier collects | | Cut glass, mirrors, and tabletops sold without installation | Retail sale; taxable |

The books must separate the lines, the resale certificate applies only to material bought for the second, third, and fourth rows, and use tax is owed on material bought tax-free and then installed under a lump-sum contract.

Inventory and materials

Sheet glass, tempered stock, mirror, frames, hardware, sealants, and auto glass are inventory for a shop that sells at retail or under retail-plus-installation contracts, deducted as sold; for lump-sum work they are job materials. A shop whose average annual gross receipts are $32 million or less (the 2026 threshold) may instead treat inventory as non-incidental materials and supplies or follow the method in its books. Impact windows and doors ordered per job from the manufacturer are job materials, with the deposit paid to the manufacturer deducted not when it is paid but as the windows are installed on the job, under either the cash or the accrual method.

Equipment and the shop

Cutting tables, glass lifts and suction cups, polishing and edging machines, tempering ovens (for shops that temper), racks, and the shop's overhead crane are equipment — expensed under Section 179 or bonus depreciation, or depreciated — generally over five years, the recovery period for a contractor's construction equipment. Vans and trucks with glass racks rated over 6,000 pounds gross vehicle weight are deducted in full under the actual-expense method; the rack is part of the upfit. Hand tools, cutters, and suction cups under the de minimis threshold are supplies. A leased shop's interior build-out is qualified improvement property — 15-year property eligible for bonus depreciation.

Impact windows and the storm programs

Florida homeowners replace windows and doors with impact-rated products in large numbers, driven by insurance discounts, building codes, and the My Safe Florida Home program, run by the Florida Department of Financial Services. After a free wind-mitigation inspection, it offers eligible homeowners — owner-occupied, homesteaded, low- or moderate-income — grants of up to $10,000 for upgrades such as impact windows and doors, with $2 of state money for every $1 from the homeowner (low-income homeowners need no match). The program runs on annual legislative appropriations; its official site was advertising grants as available in October 2026, but funding rounds open and close, and the work must be permitted and done by a properly licensed contractor. The grant is the homeowner's; the glazier's income is the full contract price, whatever share of it the program funds. Impact installation is real property work requiring a permit and inspection under the building code; permit fees and the engineering documents for product approvals are job costs.

Licensing, crews, and insurance

Florida offers a state-certified glass and glazing specialty contractor license (Fla. Admin. Code R. 61G4-15.100(1)(s)), covering windows and glass of all types, glass doors, storefronts, curtain walls, structurally anchored impact-resistant opening protection, mirrors, and shower enclosures. Since 2012 it has been voluntary: non-structural glass and mirror work needs no state license, but installing windows, doors, storefront frames, and structurally anchored opening protection requires a general, building, or residential contractor license or an appropriate specialty license, and counties and cities may require a local license that the state certification satisfies. The license holder's qualifier status, exam, continuing education, and renewal are deductible. Installation crews are construction employees: workers' compensation from the first employee; an exemption — available to up to three corporate officers or LLC members who each own at least 10 percent — covers only those owners. Auto glass technicians, in the shop or mobile, are employees too. Florida treats an employer as in the construction industry when any portion of its operations falls under a construction class code — door and window installation and glazier work away from the shop are both on the list — so a company that installs and also does auto glass generally needs coverage from the first employee; the four-employee non-construction threshold is for a shop with no installation work. General liability, commercial auto, inland marine on the glass in transit (breakage), and workers' compensation are deductible.

Worked example. A glazing company does impact window installation, storefront work, auto glass, and counter sales. Its $1.4 million of impact and storefront jobs are lump-sum contracts: it pays tax on $820,000 of windows, doors, and frames at purchase and charges customers none. Its $260,000 of auto glass is taxable in full, collected and remitted, with the replacement glass bought tax-free for resale. Its $90,000 of counter sales of cut glass and mirrors is taxable retail, bought tax-free with a resale certificate. It buys a $42,000 cutting and edging system and two $56,000 rack vans, all deducted in full — $154,000. Twelve installers and three auto glass technicians are on payroll with workers' compensation, required from the first employee because the installation work makes the company a construction employer; the qualifying contractor's license is renewed and deducted.

Official sources

The Florida Department of Revenue explains: “Generally, transactions that involve items that are permanently installed into a structure, where they cannot be removed without destroying them, are classified as real property and are not subject to sales tax. You should also consider the pricing arrangement in the contract when determining whether to charge tax.” — Florida Department of Revenue, Sales and Use Tax on Construction, Improvements, Installations and Repairs (GT-800067), https://floridarevenue.com/forms_library/current/gt800067.pdf

The Florida Department of Business and Professional Regulation explains: “Please be aware that work such as installation of doors, windows, store front frames and structurally anchored opening protections will still require a Division I contractors license or an appropriate specialty contractors license.” — Florida Department of Business and Professional Regulation, Construction Industry – FAQs, https://www2.myfloridalicense.com/construction-industry/faqs/

The Florida Department of Financial Services explains: “Employers with one or more employees, including the owner of the business who are corporate officers or Limited Liability Company (LLC) members, must have workers' compensation coverage. For a list of the trades considered to be in the construction industry see 69L-6.021 Florida Administrative Code.” — Florida Department of Financial Services, Coverage Requirements, https://www.myfloridacfo.com/division/wc/employer/coverage-requirements

Related guides

• Welding Business Deductions: The Rig on the Truck, the Gas Cylinders You Rent, the Consumables, the Certification Tests, and the Fabrication Labor Florida Taxes
• Flooring Installer Deductions: The Material You Pay Tax On and the Material You Collect Tax On, the Showroom Inventory, the Installers Who Are Employees, the Saws, and the Remnants
• Auto Body Shop Deductions: The Paint Booth, the Frame Machine, the Materials That Are Inventory, the Insurer's Direct Repair Program, and the Hazardous Waste Fees
• Inventory for Tax: FIFO, LIFO, and the Small Business Rule
• Florida Sales Tax on Services: Which Services Are Taxable, the Nonresidential Cleaning Rule, and the Service Business That Sells Parts

Next step

Fairlight Accounting handles U.S. domestic, cross-border (U.S.–Canada), and international tax returns, plus bookkeeping, payroll, and CFO advisory. Our U.S. Tax Desk sets up the three invoice types a glazier needs and keeps the resale certificate confined to the lines it covers. See pricing or book a free fit call.