Tax Commissioner

The Tax Commissioner of Ohio is the chief administrative officer of the Department of Taxation, vested with the ultimate authority to audit, verify, and prescribe the methodology for claiming research and development tax credits. In the context of the Ohio Research and Development Investment Tax Credit, the Commissioner serves as the final arbiter of compliance, ensuring that “qualified research expenses” align with both federal definitions and strict state-level jurisdictional and documentation requirements.

The Legal Persona and Administrative Scope of the Tax Commissioner

The office of the Tax Commissioner, currently held by Patricia Harris, is a cabinet-level position with broad powers to execute the state’s revenue laws as established under the Ohio Revised Code (ORC). While often confused with the Director of Development—a role currently occupied by Lydia L. Mihalik—the Tax Commissioner operates a distinct agency focused on the assessment and collection of taxes rather than the issuance of economic development incentives. Within the specific ecosystem of the Ohio Research and Development (R&D) Investment Tax Credit, the Commissioner’s role is defined by a high degree of discretionary power in auditing claims, formulating rules for credit schedules, and issuing final determinations that set the precedent for how state law is applied to corporate taxpayers.

The administrative mandate of the Commissioner extends to the Commercial Activity Tax (CAT), the Financial Institutions Tax (FIT), and the Individual Income Tax, each of which features unique statutory provisions for R&D-related benefits. The Commissioner is responsible for “making all tax assessments, valuations, findings, determinations, computations, and orders,” which includes the power to re-determine or correct previous findings if a taxpayer’s R&D claim is found to be deficient upon review. This oversight is critical because the R&D credit is “self-claimed” on a tax return without a mandatory pre-approval process from the Department of Development for the expense-based portion of the credit. Consequently, the Tax Commissioner acts as the primary gatekeeper, ensuring that the tax benefit is only utilized by those who meet the rigorous standards of Internal Revenue Code (IRC) Section 41 as modified by Ohio law.

Statutory Framework and the Interplay of Ohio Agencies

The Ohio R&D tax credit is not a monolithic entity but a collection of credits distributed across different chapters of the Ohio Revised Code. The Commissioner must navigate these various sections to ensure consistency in tax administration. The primary credits under the Commissioner’s purview include the nonrefundable credit for qualified research expenses against the CAT (ORC 5751.51), the credit for financial institutions (ORC 5726.56), and the credit for R&D loan payments (ORC 5747.331 and 5751.52).

Credit Type	Ohio Revised Code Section	Tax Applicability	Commissioner’s Primary Role
Nonrefundable QRE Credit	5751.51	Commercial Activity Tax (CAT)	Auditing QREs and verifying Ohio-specific nexus.
Financial Institution R&D Credit	5726.56	Financial Institutions Tax (FIT)	Representative sampling and assessment issuance.
R&D Loan Payment Credit	5751.52 / 5747.331	CAT / Individual Income Tax	Verifying certificates from the Director of Development.
Legacy Franchise Credit	5733.351	Corporation Franchise Tax	Managing carryforward balances from prior tax years.

The relationship between the Tax Commissioner and the Ohio Tax Credit Authority (Authority) is collaborative but strictly delimited by statute. The Authority, a five-member independent board composed of taxation and economic development professionals, is responsible for reviewing and approving applications for tax credit assistance, such as the Jobs Creation Credit. However, for R&D credits, the Authority’s role is often focused on the monitoring of projects that receive state loans, whereas the Tax Commissioner remains the final authority on whether those loan payments translate into valid tax credits on the annual or quarterly returns. The Authority includes key figures such as Emmett Kelly, Brian S. Cooper, Joy Evangelista, and Debora McGraw, who provide the oversight for the “front-end” of incentive packages, while the Commissioner’s staff in the Business Tax Division handles the “back-end” of tax compliance and audit.

Detailed Analysis of “Qualified Research Expenses” (QREs)

The meaning of the Tax Commissioner’s role is most clearly seen in the interpretation of “qualified research expenses.” Ohio law explicitly states that QREs have the same meaning as in Section 41 of the Internal Revenue Code. However, the Commissioner enforces a vital “jurisdictional and geographical distinction” that is not present in the federal code. For federal purposes, research conducted anywhere in the United States or its territories may qualify; for Ohio purposes, the Tax Commissioner strictly requires that the expenses be “incurred in this state by the taxpayer”.

The Four-Part Test in the Ohio Context

The Commissioner utilizes the federal four-part test as the foundational framework for state audits. To satisfy the Tax Commissioner’s requirements, a taxpayer must demonstrate that their research activities meet all of the following criteria:

• Permitted Purpose: The objective of the research must be to create a new or improved business component’s function, performance, reliability, or quality.
• Elimination of Uncertainty: The taxpayer must intend to discover information that would eliminate uncertainty regarding the capability or method for developing or improving a business component, or the appropriateness of its design.
• Process of Experimentation: There must be a systematic process designed to evaluate one or more alternatives, such as through modeling, simulation, or trial and error.
• Technological in Nature: The research must fundamentally rely on principles of physical, biological, computer, or engineering sciences.

The Tax Commissioner’s interpretation of these points often leads to a “paper-only” audit approach, where the absence of contemporaneous project notes, lab results, or payroll logs can lead to a summary denial of the credit. Recent trends in the Department of Taxation suggest that the Commissioner’s agents are increasingly focused on the “Process of Experimentation,” demanding proof that the taxpayer actually evaluated multiple alternatives rather than simply performing routine engineering or quality control.

The Calculation of the Credit Amount

The Tax Commissioner provides specific guidance on the mathematics of the credit. The credit is generally calculated as 7% of the amount by which the current year’s Ohio QREs exceed the average annual Ohio QREs for the three preceding taxable years. This calculation is expressed as:

$$Credit_{Ohio} = 0.07 \times \left( QRE_{current} – \frac{\sum_{i=1}^{3} QRE_{t-i}}{3} \right)$$

If a taxpayer has no history of QREs in Ohio, the base amount (the denominator) is treated as zero, allowing the 7% credit to apply to the entire current-year investment. The Commissioner requires this calculation to be performed on a “member-by-member” basis for taxpayers included in a combined or consolidated group, ensuring that the research activities of one subsidiary are not improperly attributed to another for the purpose of inflating the credit.

Local State Revenue Office Guidance: Administrative Rules and Releases

The Tax Commissioner disseminates “local state revenue office guidance” through the Ohio Administrative Code (OAC) and Information Releases. These documents represent the Commissioner’s official stance on how the law should be applied and are binding on Department of Taxation staff during audits.

OAC 5703-29-22: The Master Rule for CAT Credits

This administrative rule provides the most granular guidance for the CAT R&D credit. It establishes several critical compliance mandates:

• Filing Frequency and Timing: The credit must be computed based on expenses incurred during the calendar year, regardless of the taxpayer’s federal taxable year. It must be first claimed on the annual return due in May or the fourth-quarter return due in February.
• Order of Application: The Tax Commissioner dictates a strict “order of credits” under ORC 5751.98. Nonrefundable credits like the R&D credit must be applied after certain other credits but before any carryforwards are utilized.
• Documentation and Denial: If a taxpayer fails to provide the required “Form CAT CS” or any necessary certificates from the Director of Development, the Tax Commissioner is mandated to deny the credit until such documentation is produced.

Information Release CAT 2007-03

This release, archived and revised over the years (lastly in 2022), explains the transition of credits from the old Corporation Franchise Tax to the CAT. The Commissioner clarifies that a taxpayer cannot claim a credit against the CAT if they previously received the benefit of that same credit against another tax. This release also details the carryforward periods for various credits:

Credit Name	Carryforward Period	Statutory Basis
Qualified Research Expenses (QRE)	7 Years	ORC 5751.51
R&D Loan Payments	Unlimited	ORC 5751.52
Jobs Retention Credit	3 Years	ORC 122.171
Unused Franchise Net Operating Losses	20 Years	ORC 5751.53

Guidance on Audit Procedures and Representative Sampling

A unique power of the Tax Commissioner, specifically emphasized in the Financial Institutions Tax context (ORC 5726.56), is the ability to audit a “representative sample” of the taxpayer’s QREs. The Commissioner is instructed to make a “good faith effort” to reach an agreement with the taxpayer regarding the sample selection. However, the guidance also clarifies that the Commissioner is not precluded from proceeding if an agreement cannot be reached, giving the Department significant leverage during the audit process.

The Impact of Legislative Reforms: House Bill 33 and the 135th General Assembly

The 2023 budget bill, Am. Sub. House Bill 33, introduced seismic shifts in the Ohio tax landscape, directly affecting the Tax Commissioner’s role in R&D administration. Key changes include:

• Increased Exclusion Thresholds: The CAT exclusion was raised from $1 million to $3 million in 2024 and will reach $6 million in 2025. The Tax Commissioner has issued guidance allowing businesses below these thresholds to cancel their CAT accounts.
• Codification of Audit Authority: HB 33 explicitly empowered the Department of Taxation to audit QREs and mandated that taxpayers maintain records for four years. Practitioners have noted that this change “effectively gave justification to the Department of Taxation’s aggressive audit policy,” as the Commissioner can now cite these amendments to support heightened documentation demands.
• Elimination of Annual Filing: The Tax Commissioner now requires all CAT taxpayers to file on a quarterly basis, eliminating the annual filing option for periods after January 1, 2024.

These reforms have turned the Commissioner’s office into a more rigorous investigative body. Because fewer small businesses will pay the CAT, the Commissioner’s audit resources are likely to be concentrated on the larger entities that remain, particularly those claiming significant R&D credits.

Judicial Review and the Limits of the Commissioner’s Discretion

While the Tax Commissioner possesses broad authority, the Ohio Board of Tax Appeals (BTA) and the Ohio Supreme Court serve as critical checks on that power. Recent cases have challenged the Commissioner’s ability to impose requirements that go beyond the plain language of the statute.

Testimonial Evidence vs. Written Logs: “Perrigo Sales Corp. v. Harris”

In Perrigo Sales Corp. v. Harris (2025), the BTA addressed whether the Tax Commissioner could reject a taxpayer’s claim simply because it was supported by “testimonial evidence” rather than written logs. The Commissioner had argued for a heightened burden of proof, but the BTA, following the Supreme Court’s decision in Stingray Pressure Pumping, LLC v. Harris, ruled that the tribunal’s role is to provide a “fair reading” of the statute that is not “slanted toward one side or the other”. This case is a landmark for R&D taxpayers, as it suggests that credible testimony from engineers and researchers can substantiate R&D activities even if formal project logs are incomplete, effectively checking the Commissioner’s “paper-only” audit preference.

The “Park-Ohio” Effect and Federal Conformity

The ongoing litigation in Park-Ohio Holdings Corp. v. United States highlights a similar struggle at the federal level, where the IRS is demanding granular, person-by-person explanations for R&D work. The Ohio Tax Commissioner has historically shadowed these federal tactics. If the courts rule that these requirements are “unreasonable recordkeeping,” the Ohio Tax Commissioner may be forced to scale back the aggressive documentation demands currently found in Department guidance.

The “Loper Bright” Trend and Agency Deference

The U.S. Supreme Court’s decision in Loper Bright Enterprises v. Raimondo, which overturned Chevron deference, is beginning to ripple through Ohio tax law. The Ohio Supreme Court has shown a newfound willingness to scrutinize the Tax Commissioner’s determinations, as seen in the CAUV case where the Commissioner’s clearing-cost rate was deemed “arbitrary” because it lacked substantial evidence. For R&D credits, this means the Commissioner’s “Information Releases” no longer carry the weight of law and can be successfully challenged if they impose extra-statutory burdens on taxpayers.

Practical Compliance: Forms, Logistics, and Voluntary Disclosure

To interact with the Tax Commissioner’s office effectively, taxpayers must utilize a suite of prescribed forms and electronic services. The “OH|TAX eServices” platform is the primary gateway for filing returns and managing payments.

Form CAT CS: The Critical Schedule

To claim the R&D credit, a taxpayer must submit “Form CAT CS” (Commercial Activity Tax Credit Schedule) along with their return. The Tax Commissioner requires the following information on this form:

• Entity Identification: Name, FEIN, and CAT account number for the reporting entity and the specific member entitled to the credit.
• Calculation Logic: A four-year breakdown of expenses (current year plus three prior years) to calculate the 7% credit earned.
• Facility Location: The specific address where the research was conducted, which is vital for the “incurred in this state” requirement.
• Supporting Documentation: For nonrefundable credits, the Commissioner advises attaching a copy of the federal Form 6765 to substantiate the “qualified” nature of the research.

The Voluntary Disclosure Agreement (VDA) Program

For companies that have overlooked their CAT obligations while conducting R&D in Ohio, the Tax Commissioner provides a path to compliance through the VDA program. This program allows a business to voluntarily register and pay back taxes for a three-year “lookback” period, with all penalties waived. The Commissioner’s agents review these requests, and if approved, the taxpayer can then claim their R&D credits for the prior three years to offset the newly disclosed liability.

Comprehensive Example: The Commissioner’s Role in a Manufacturing Scenario

To illustrate the meaning of the Tax Commissioner in this context, consider the case of “Buckeye Precision Engineering,” a manufacturing firm specializing in aerospace components with its primary facility in Akron, Ohio.

Step 1: Claiming the Credit

In 2024, Buckeye Precision Engineering invests $2,000,000 in qualifying research activities, including the development of a new heat-resistant alloy. Their records show Ohio QREs for the preceding three years as follows:

• 2023: $1,500,000
• 2022: $1,400,000
• 2021: $1,600,000

The average of these three years is $1,500,000. Under the Tax Commissioner’s prescribed calculation, the excess QRE is $500,000 ($2,000,000 – $1,500,000). The credit amount is:

$$Credit = 0.07 \times \$500,000 = \$35,000$$

Buckeye Precision Engineering files their fourth-quarter 2024 CAT return and includes “Form CAT CS,” listing the Akron facility address and attaching their federal Form 6765. They apply the $35,000 credit against their CAT liability for the quarter.

Step 2: The Audit and the Commissioner’s Assessment

Two years later, the Tax Commissioner’s office initiates an audit. The auditor requests the “project narratives” for the heat-resistant alloy. During the review, the auditor discovers that Buckeye Precision Engineering included the wages of three engineers who work remotely from their homes in Pennsylvania.

The Tax Commissioner issues a “Final Determination” (similar to the Cristal USA case), ruling that these wages must be excluded because they were not “incurred in this state”. Furthermore, the auditor determines that one of the projects—aimed at fixing a known defect in an existing product—did not involve “experimentation” but was routine maintenance.

Step 3: Reassessment and Interest

The Commissioner issues an assessment for the disallowed portion of the credit, plus interest. Buckeye Precision Engineering, utilizing the Perrigo precedent, provides testimonial evidence from the Lead Metallurgist explaining that the “defect fix” actually required a complete redesign of the molecular structure of the alloy, which involved high technical uncertainty. The Commissioner reviews this testimony and, recognizing the evolving judicial standard, partially restores the credit, but maintains the disallowance for the out-of-state wages.

Second and Third-Order Insights: The Future of the Commissioner’s Role

The meaning of the Tax Commissioner in the Ohio R&D context is shifting from a purely administrative role to one of highly specialized technical oversight. This evolution has several profound implications for the future.

The “Threshold Trap” for Small Businesses

The increase in CAT thresholds to $6 million creates a “threshold trap” that the Commissioner’s guidance does not explicitly address but which is inferred by the carryforward rules. Small businesses that drop out of the CAT system in 2025 may stop maintaining the rigorous R&D records required by the ODT. If these companies grow and re-enter the CAT system five years later, they will be unable to claim the R&D credit because they cannot prove their “base period” average from the years they were exempt. The Commissioner’s role will likely expand to providing “voluntary filing” guidance for these entities to preserve their credit history.

The Impact of “Representative Sampling” on Corporate Strategy

The Commissioner’s power to use representative sampling will fundamentally change how large corporations document their R&D. Instead of focusing on every project, companies will likely focus on “perfection” in a few high-value projects, knowing that these will serve as the “representative sample” for the entire claim. This could lead to a strategic narrowing of R&D investments in Ohio as firms avoid smaller, harder-to-document technical trials that might pull down their audit success rate.

The End of Agency Deference and the Rise of Professional Tax Controversy

With the erosion of Chevron-style deference in Ohio, the Tax Commissioner’s “Final Determinations” will be viewed as the starting point of a legal dispute rather than the end of it. We can expect the rise of specialized “Tax Controversy” practices in Ohio law firms that focus specifically on challenging the Commissioner’s interpretation of IRC Section 41. The Commissioner will likely respond by hiring more engineers and technical specialists to ensure that Department assessments can withstand the heightened scrutiny of the Board of Tax Appeals.

Summary of the Commissioner’s Interpretive Guidelines

To successfully navigate the Ohio R&D tax credit, taxpayers must understand the following core interpretations enforced by the Commissioner:

Interpretation Category	Commissioner’s Stance	Legal Consequence
Geographic Nexus	Expenses must be strictly incurred within Ohio borders.	Out-of-state remote work or testing is disallowed.
Federal Mirroring	Ohio “piggybacks” on IRC 41, but with independent state audit rights.	Federal approval does not guarantee State approval.
Member-by-Member	Credits are calculated at the individual entity level.	Groups cannot aggregate expenses to bypass base-period thresholds.
Documentation Standard	Contemporaneous records are preferred, but testimony is increasingly relevant.	Failure to provide “Form CAT CS” results in immediate denial.
Carryforward Priority	Credits must be used in the specific order dictated by section 5751.98.	Improper ordering can lead to the “loss” of carryforward benefits.

Final Thoughts

The Tax Commissioner is far more than a collector of revenue; in the context of the Ohio R&D tax credit, the Commissioner is the architect of the state’s technical compliance standards. By interpreting federal law through a strictly local lens, the Commissioner ensures that state tax benefits are directly tied to Ohio-based investment. The Commissioner’s authority to audit, sample, and assess creates a rigorous environment that demands “audit-ready” documentation from the moment research begins.

As the legal landscape shifts toward a “plain language” reading of statutes and away from blind agency deference, the Tax Commissioner’s role will continue to adapt. Taxpayers who understand the Commissioner’s prescribed forms—and the judicial limits of the Commissioner’s power—will be best positioned to maximize their R&D benefits. Ultimately, the meaning of the Tax Commissioner in this context is defined by a balance of administrative rigor and the evolving standards of fairness established by the Ohio courts. Professional adherence to the local guidance issued by the Department of Taxation remains the only viable path for ensuring that the 7% investment credit is both secured and defended.