Key Takeaways
- Ohio’s manufacturing sales tax exemption applies to purchases used primarily (more than 50%) in a qualifying production operation, covering production machinery, consumables, materials handling equipment, and utilities.
- The “primary use” test governs dual-use equipment. Whether an asset is fully exempt or fully taxable depends on which use (production or non-production) accounts for the majority of its activity.
- Utilities are fully exempt when production accounts for more than 50% of total consumption, but claiming that exemption requires a utility usage study.
- Ohio allows refunds on sales tax already paid on qualifying purchases. Form ST AR must be filed within four years of the payment date—a lookback window that carries real recovery potential.
- The most common gaps: under-claimed utility exemptions, repair parts categorized as generic maintenance supplies, and dual-use equipment that was never formally classified under the primary use test.
When did your team last audit which purchases are being taxed and whether they should be?
Ohio’s sales tax exemption for manufacturing is broader than most companies realize, and the gap between what is claimable and what is actually claimed tends to grow quietly over time.
For Ohio manufacturers, understanding the full scope of the exemption is a measurable line item that could save you money in the long run.
What Is the Ohio Manufacturing Sales Tax Exemption?
The Ohio manufacturing sales tax exemption is a provision in Ohio law that lets qualifying manufacturers avoid paying sales tax on purchases that go directly into their production process.
This includes things like:
- Equipment that acts on the product
- Consumables used in manufacturing
- Materials handling equipment
- Qualifying utilities.
If it is part of how you make what you sell, there is a good chance it is exempt.
An important nuance is that this is not a blanket exemption that applies to everything a manufacturer buys. It applies based on how a purchase is actually used.
A piece of equipment used on the production floor qualifies. The same piece used in a warehouse or administrative area does not. That distinction is what makes a periodic review worthwhile, because the line between qualifying and non-qualifying use is where most of the money gets left behind.
Why Is the Sales Tax Exemption Meaningful to Manufacturers?
The exemption exists because the state recognizes that taxing production inputs creates an unnecessary drag on manufacturing competitiveness.
Ohio’s combined sales tax rate runs up to 8%, depending on the county (5.75% state plus up to 2.25% local). On a $1 million year of qualifying equipment and supply purchases, that is up to $80,000 that should not be changing hands.
That context matters. Manufacturing generated $137.9 billion of Ohio’s GDP in 2024 — 16.5% of the state’s private economy, the largest share of any industry.
Ohio did not arrive at that position by accident, and the sales tax exemption is part of the policy infrastructure that supports it. The exemption is the state’s way of keeping production costs from being inflated by taxes on the inputs that make manufacturing possible.
It’s worth noting that the exemption applies to both sales tax and use tax. If your company purchased qualifying equipment or supplies from an out-of-state vendor and did not pay Ohio sales tax at the time, that purchase may still be subject to Ohio use tax—and the same exemption applies. For manufacturers who source nationally, that is a frequently overlooked area of both exposure and opportunity.
How Do You Know If You Qualify?
Two questions determine whether you qualify: Does Ohio consider your business a manufacturer? And does the specific purchase go primarily toward making what you sell?
Let’s dive into both.
1. You Fall Into The State’s “Manufacturer” Definition
Ohio defines a manufacturer as a person engaged in manufacturing, processing, assembling, or refining a product for sale.
The core legal test is whether the business is changing, converting, or transforming materials into a different state or form from the one in which they previously existed.
For most mid-market Ohio manufacturers, like metal fabricators, food processors, plastics manufacturers, and industrial equipment producers, the threshold question of qualification is relatively straightforward. The more consequential question is not whether you qualify as a manufacturer, but whether the specific purchases you are making qualify for the exemption.
2. Your Purchases Meet the State’s Criteria
Ohio’s standard is built around a “primary use” test.
A piece of equipment or a supply used more than 50% of the time in a qualifying manufacturing operation is exempt.
If it is used in both manufacturing and non-manufacturing activities, the classification—taxable or exempt—is determined by which use predominates. That primary use determination matters, and it needs to be documented before an audit surfaces the .
A word of caution: if your company is ever audited, Ohio auditors have been known to physically observe operations on the factory floor, timing the use of specific equipment to verify it meets the exempt threshold. A well-supported primary use determination is your best line of defense when that scrutiny arrives.
Rea’s manufacturing and distribution advisors work with Ohio manufacturers at every stage of growth to identify where tax exposure exists and where exemptions are going unclaimed.
What Does the Ohio Manufacturing Sales Tax Exemption Cover?
The scope of eligible purchases is broader than many manufacturers initially assume.
Production machinery and equipment that directly act on the product are exempt, as is materials handling equipment that moves product through a continuous manufacturing operation. Consumables that interact directly with the product (e.g., catalysts, solvents, water, acids, and similar substances) qualify when they are integral to the process itself.
Utilities are also eligible, though the rules require attention. Ohio provides a full exemption on electricity, natural gas, water, and other utilities when more than 50% of consumption occurs in qualifying production activities. This is the category most frequently left on the table because claiming it requires a utility usage study.
What is explicitly excluded includes property used in administrative functions, security, inventory control, pre-production storage of raw materials, post-production handling of finished goods, and HVAC or ventilation systems. The boundary between production and non-production use is where most disputes arise, which makes clear documentation both a compliance matter and a strategic one.
Where Ohio Manufacturers Leave Money on the Table
The most common missed exemptions fit into one of the following categories.
Utilities
Utilities represent the largest recurring oversight, particularly for manufacturers who have never conducted a formal usage study to document production versus non-production consumption. The challenge is compounded when a facility has a single energy entry point serving both the plant floor and administrative areas. Without separate energy monitors for production and administrative usage, isolating exempt costs requires a formal study — and without that study, there is no defensible basis for the exemption claim. Many manufacturers end up paying full tax on utility costs that would qualify if the analysis were done.
Repair and Replacement Parts
Repair and replacement parts for production equipment are another area that warrants careful attention — in both directions. Parts used to maintain machinery that qualifies for the exemption are themselves exempt, but the connection between the parts and the qualifying equipment must be traceable and documented.
There is also an exposure side to this. Many manufacturers purchase parts and supplies in bulk without paying sales tax upfront. When those items are consumed, the tax treatment depends on what they are ultimately used for — exempt production equipment or taxable equipment. If parts go toward taxable equipment, use tax needs to be accounted for separately. Generic categorization as “maintenance supplies” in an ERP or accounting system obscures that distinction and creates risk in both directions: missed exemptions on one side, untracked use tax liability on the other.
Dual-Use Equipment
Dual-use equipment represents a third area of opportunity. Ohio’s primary use test means some assets that appear borderline may qualify fully for the exemption, but only if the usage analysis has been completed and documented. Without it, manufacturers tend to default to paying tax rather than making the case.
There is also a retroactive opportunity worth understanding. Ohio allows manufacturers to file for refunds on sales tax already paid on qualifying purchases going back four years, using Form ST AR. For a company that has never reviewed its exemption claims in detail, that lookback window can represent a meaningful recovery.
Rea’s SALT advisors help manufacturers work through both sides of that equation. Importantly, before submitting any refund claim, they assess whether tax exposure exists elsewhere in the operation, because the last thing a refund filing should do is trigger an audit that wipes out the recovery.
How to Claim, Document, and Protect Your Exemption
Claiming the Ohio manufacturing sales tax exemption requires providing vendors with the correct Ohio Department of Taxation exemption certificate at the time of purchase.
- For recurring purchases from the same vendor, Form STEC B is the standard mechanism.
- For one-time purchases, Form STEC U applies.
Both forms are available through the Ohio Department of Taxation.
The certificate must identify the purchasing company, describe the nature of the exempt use, and cite the specific statutory basis for the exemption. Vague language creates audit risk. A certificate that states “manufacturing use” without identifying the qualifying activity and the governing statute is unlikely to hold up under scrutiny from Ohio’s Department of Taxation.
If your company has already paid sales tax on purchases that should have qualified for the exemption, Form ST AR, Ohio’s Sales/Use Tax Application for Refund, is the mechanism to recover those amounts. The filing window is four years from the date of payment, with no minimum threshold. Given how frequently exemption reviews surface recoverable amounts, that four-year window is worth treating with some urgency.
Make Sure Your Ohio Tax Strategy Is Working as Hard as Your Operation
Ohio’s manufacturing sales tax exemption is one of the more meaningful tax tools available to manufacturers in the state. But its value depends entirely on how well it is claimed, documented, and maintained.
At Rea, our manufacturing and distribution advisors work with Ohio companies to identify unclaimed exemptions, build defensible documentation practices, and connect sales tax strategy to the broader financial picture of the business.
Whether you are reviewing your exemption posture for the first time or evaluating refund opportunities within the four-year lookback window, the right advisory relationship makes the process considerably more productive.
Rea’s SALT advisors provide an extensive use tax process review and mapping — helping manufacturers understand which areas of their operation carry exempt or taxable usage, and where the real risk and opportunity live. Contact Rea’s SALT team to discuss what a comprehensive sales and use tax review could mean for your operation.
About the Author
Kathy LaMonica, Principal, Director of State & Local Tax (SALT)
Kathy LaMonica is a Principal at Rea and Director of the firm’s State and Local Tax practice, with a focus on indirect tax consulting, compliance, and technology. Since joining Rea in 2018, she has built and grown the firm’s sales tax compliance practice into a significant service offering — earning recognition from Avalara as a success story in the process. Kathy holds certifications as an Avalara Certified Implementation Professional (CIP) and a Vertex Implementation Specialist and brings deep experience advising manufacturers and contractors on complex sales and use tax issues. She is a member of the Institute for Professionals in Taxation and is based in Rea’s Cleveland office.
To connect with Kathy or learn more about Rea’s State and Local Tax services, visit reaadvisory.com/contact or explore our SALT practice page.
