New York State offers a significant sales tax exemption for businesses engaged in manufacturing. When properly applied, machinery, equipment, parts, tools, and certain supplies used directly in the production process can be purchased free of sales tax — a meaningful cost reduction for manufacturers operating in a high-tax state.
But the exemption is not automatic and not unlimited. Qualifying for it requires meeting specific statutory criteria, using the correct documentation, and understanding precisely where the exemption ends and taxable purchases begin. Businesses that claim the exemption too broadly — exempting purchases that do not qualify — face audit adjustments that include the uncollected tax, interest, and penalties. Businesses that fail to claim it at all pay tax they do not legally owe.
Getting the manufacturing exemption right is a substantive compliance task. The Tax Department audits manufacturers specifically for improper use of exemption certificates, and both over-claiming and under-claiming are audit findings.
While our office is based on Long Island, we represent manufacturing businesses facing NYS sales tax audits and serious sales tax problems throughout New York State — including Nassau County, Suffolk County, and across the New York City metro area.
Who qualifies as a manufacturer in NYS?
To claim the manufacturing exemption, a business must be engaged in manufacturing — the process of making, processing, fabricating, or assembling tangible personal property for sale. The critical element is that the end product must be sold, not consumed by the manufacturer in its own operations.
Qualifying activities include traditional manufacturing and fabrication, food processing and production, printing and publishing, mining and extraction, and research and development activities directly tied to production.
Service businesses, retailers, and businesses that process materials for internal use rather than for sale generally do not qualify. A restaurant that cooks food and sells it may qualify for certain exemptions on cooking equipment, but the analysis is fact-specific. A business that takes in raw materials and produces a finished product for sale to customers is the core qualifying activity.
The two key tests are "directly" and "predominantly"
The manufacturing exemption applies to purchases used "directly and predominantly" in the production process. The Tax Department applies both tests before allowing an exemption:
The "directly" test. The equipment or supplies must be used directly in the actual production activity — not in administration, management, inventory control, shipping, or other support functions. Equipment on the production floor that makes the product qualifies. The office computer used to manage billing does not.
The "predominantly" test. The item must be used predominantly in qualifying production activities — meaning more than 50% of the time. An item used 60% in qualifying manufacturing and 40% in non-qualifying activities satisfies the test. One used 30% in manufacturing and 70% in other activities; the other does not.
When an item is used in both qualifying and non-qualifying activities, an apportionment analysis is required. Businesses that exempt the full purchase price without apportioning for non-qualifying use are taking an overly broad exemption that auditors will adjust.
What purchases qualify
Qualifying exempt purchases typically include:
- Production machinery and equipment used on the manufacturing floor
- Replacement parts and components for qualifying machinery
- Hand tools and other implements used directly in the production process
- Consumable supplies used in production — lubricants, chemicals, materials that become part of the finished product
- Certain utilities and fuel used directly and predominantly in production, subject to additional rules
- Machinery used in quality control testing that is part of the production process itself
What does not qualify
The exemption does not cover:
- Office equipment, computers, furniture, and administrative supplies
- Vehicles used for transportation and delivery of finished goods
- Equipment used for storage or warehousing after production is complete
- Machinery used in administrative or sales support functions
- Building materials and capital improvements to real property
- Safety equipment and personal protective gear for workers
The line between qualifying and non-qualifying can be genuinely difficult for equipment that performs multiple functions. A piece of machinery that is used partly in production and partly for non-qualifying activities requires careful analysis of actual use patterns — and accurate records to support the claimed allocation.
How to claim the exemption
Qualifying manufacturers claim the exemption by providing vendors with a completed Exempt Use Certificate — Form ST-121 — at the time of purchase. The certificate identifies the buyer, the qualifying use of the items being purchased, and includes the buyer's certification that the purchase qualifies.
The vendor retains the certificate as documentation of why tax was not collected. If the Tax Department later determines the purchase did not qualify, the liability and any penalties shift to the buyer who issued the certificate — not the vendor.
Manufacturers should maintain copies of all certificates issued, organized by vendor and period. Lost or missing certificates are a common source of audit adjustments.
Long Island manufacturers: the regional audit environment
Long Island manufacturers — including food producers, printers, fabricators, and light industrial operations in Nassau and Suffolk County — face the same manufacturing exemption rules as manufacturers statewide, but in a regional audit environment where the DTF is actively reviewing this sector. The combination of the directly-and-predominantly test, multi-use equipment, and the documentation requirements creates genuine compliance complexity for Long Island manufacturing businesses.
Manufacturers who have been claiming the exemption broadly without maintaining use records, or who have been purchasing all equipment under the exemption without distinguishing qualifying from non-qualifying use, should conduct an internal review before the Tax Department does it for them.
Common audit findings for manufacturers
The Tax Department's most frequent adjustments in manufacturing audits:
Purchases that do not meet the direct and predominantly tests. Auditors examine actual equipment use, not just how use is described on a certificate or in a business's own records.
Failure to apportion multi-use equipment. Equipment used in both qualifying and non-qualifying activities requires an allocation. Businesses that exempt 100% of the purchase without apportionment face adjustment on the non-qualifying portion.
Missing or deficient exemption certificates. If the manufacturer cannot produce the certificate for an exempt purchase, the Tax Department assesses tax on that purchase.
Misclassification of the business activity. Some businesses claim the manufacturing exemption for activities that do not qualify under New York law — processing materials for their own use, providing services rather than making products for sale.
Why work with an experienced New York sales tax attorney
NYS sales tax matters are not like federal tax issues. The New York State Department of Taxation and Finance has its own procedures, its own auditors, and its own enforcement playbook — and it moves aggressively. For manufacturers, the directly-and-predominantly test and the documentation requirements create real compliance complexity, and audit assessments in this sector can be substantial. Here is what an experienced New York sales tax attorney brings to the table:
- Deep knowledge of DTF audit procedures. We know how auditors are trained, what indirect methods they use, and where their assessments can be challenged. Generic tax help is not enough here.
- Direct negotiation with the Tax Department. We communicate with the DTF on your behalf from day one — protecting you from statements that can be used against you and positioning the case correctly from the start.
- Personal liability protection. NYS sales tax is a trust fund tax. If your business owes it, the state can and will pursue you personally. An attorney identifies and limits that exposure before it becomes a personal financial crisis.
- Knowledge of every resolution option. From installment agreements to Voluntary Disclosure to formal appeals — we know which path fits your situation and how to negotiate the best possible outcome.
- Local presence, statewide reach. Our practice is based on Long Island and focused exclusively on New York tax problems. We are not a national call center. When you work with us, you work directly with an attorney who knows New York State tax law from the inside.
Speak with a New York sales tax attorney
If you have received a DTF audit notice, or have a serious New York State sales tax problem, the NYS Tax Department does, do not wait. The sooner you have qualified representation, the more options remain available to you.
Contact our office to speak directly with a New York sales tax attorney. While our office is based on Long Island, we represent businesses and individuals facing NYS sales tax problems throughout New York State — from New York City and Long Island to Westchester, the Capital Region, the Hudson Valley, and beyond. Call us or use the contact form at Tax Problem Law Center to schedule a consultation.