Section 5733.351 (Former Credit Statute)

Section 5733.351 defines a nonrefundable credit for qualified research expenses incurred in Ohio, originally applicable to the corporate franchise tax and subsequently transitional to current business tax regimes. It establishes a 7% incentive on the increase of research spending over a three-year average, ensuring that growth in state-based innovation is financially rewarded and preserved through carryforward provisions.

The legislative landscape of Ohio’s business taxation has undergone significant transformations over the last quarter-century, moving from a traditional corporate income and net worth-based model to a broad-based gross receipts tax. At the heart of this evolution lies Section 5733.351 of the Ohio Revised Code (R.C.), often referred to as the “Former Credit Statute” due to its origin within the now-phased-out Corporation Franchise Tax (CFT). Despite the transition of most Ohio businesses to the Commercial Activity Tax (CAT), Section 5733.351 remains a cornerstone of the state’s fiscal policy toward innovation. It provides the legal definitions, historical baseline methodologies, and carryforward protections that continue to influence how the Ohio Department of Taxation (ODT) evaluates research and development (R&D) incentives today. To understand the current state of the Ohio R&D tax credit, one must meticulously analyze the language of Section 5733.351, its mechanical interaction with current statutes like R.C. 5751.51 and R.C. 5726.56, and the extensive body of administrative guidance issued by the Tax Commissioner.

Legislative Genesis and the Context of Corporate Franchise Tax

The Ohio Research and Development Investment Tax Credit was birthed during a period of economic repositioning. The General Assembly enacted Section 5733.351 to provide a powerful incentive for corporations to locate their high-value research activities within Ohio boundaries. Originally, this credit was allowed against the tax imposed by R.C. 5733.06—the Corporation Franchise Tax. The history of this section is characterized by a series of delay and implementation phases. Under House Bill 283 of the 123rd General Assembly, the credit was initially intended to apply to tax year 2002 for expenses incurred on or after January 1, 2001. However, subsequent legislation delayed the broad application of the credit until tax year 2004, with specific transitional rules for taxpayers whose 2002 tax years ended prior to July 1, 2001.

During its primary years of operation under the CFT, the credit was designed as a nonrefundable offset. This meant it could reduce a corporation’s tax liability to zero, but any excess could not be refunded in cash. Instead, the statute provided a critical safety valve: a seven-year carryforward period. This carryforward remains vital for modern tax practitioners because many legacy credits generated under the CFT were permitted to “bridge” into the CAT or the Financial Institutions Tax (FIT) as those taxes replaced the franchise tax for various sectors.

The Core Mechanism of Section 5733.351

The statutory language of Section 5733.351(B) sets forth a precise incremental calculation. The credit is not granted for the total amount of research spending; rather, it is granted for the increase in research spending. Specifically, the credit equals 7% of the excess of “qualified research expenses” (QREs) incurred in Ohio during the taxable year over the taxpayer’s “average annual qualified research expenses” incurred in Ohio for the three preceding taxable years.

This incremental structure aligns Ohio with the federal research credit under Internal Revenue Code (IRC) Section 41, but with a simplified base period. While the federal credit involves complex calculations involving “fixed-base percentages” and “gross receipts,” the Ohio statute under 5733.351 utilizes a rolling three-year average of QREs. This makes the Ohio credit particularly attractive to rapidly growing technology companies and manufacturers that are scaling their Ohio-based operations.

Federal Linkage and the Meaning of Qualified Research Expenses

A defining characteristic of Section 5733.351 is its explicit adoption of federal standards. Division (A) of the statute states that “qualified research expenses” has the same meaning as in Section 41 of the Internal Revenue Code. This creates a “piggyback” relationship where the eligibility of a specific activity for the Ohio credit is largely determined by its eligibility for the federal credit. However, this linkage is a source of significant administrative complexity and litigation, as the Ohio Department of Taxation is not legally bound by the Internal Revenue Service’s (IRS) acceptance of a taxpayer’s federal claim.

The Four-Part Test for Qualified Research

To qualify under IRC Section 41, and thus under R.C. 5733.351, an activity must satisfy four distinct tests. These are not merely suggestions but mandatory legal hurdles that a taxpayer must clear to sustain a credit on audit.

The first is the Section 174 Test, which requires that expenditures be eligible for treatment as expenses under IRC Section 174. This generally includes all costs incident to the development or improvement of a product or process in the experimental or laboratory sense. It excludes routine activities like quality control, testing of materials for standard requirements, or research after the beginning of commercial production.

The second is the Technological Information Test. The research must be undertaken for the purpose of discovering information that is “technological in nature”. This means the process of experimentation must rely on the “hard sciences,” such as engineering, physics, chemistry, biology, or computer science. Research that relies on social sciences, economics, or management studies is explicitly excluded.

The third is the Business Component Test. The taxpayer must intend to use the information discovered to develop a new or improved “business component”. A business component can be a product, process, software, technique, formula, or invention that the taxpayer intends to hold for sale, lease, or license, or use in their own trade or business. Ohio guidance, particularly in law review analysis, notes that simply adapting an existing product to a new customer’s site (like a sprinkler system) may not constitute an “improved” business component if the underlying technology remains unchanged.

The fourth and perhaps most scrutinized is the Process of Experimentation Test. Substantially all of the activities must constitute elements of a process of experimentation. This involves a systematic evaluation of one or more alternatives to achieve a result where the capability, method, or appropriate design is uncertain at the beginning of the research. “Substantially all” is generally interpreted by the ODT and federal courts as at least 80% of the research activities.

Qualified Research Expenses: Wages, Supplies, and Contract Research

Section 5733.351 applies the credit to three primary types of expenses identified in IRC Section 41(b). Understanding these categories is essential for accurate calculation and documentation.

Wages paid to employees performing “qualified services” form the largest portion of most R&D claims. Qualified services include “engaging in qualified research” or “engaging in the direct supervision or direct support” of research activities. For the Ohio credit, these wages must be paid to employees physically working in Ohio.

Supplies used in the conduct of qualified research are also eligible. This includes tangible property, other than land or improvements to land and property subject to depreciation. Common examples include materials used to build prototypes or chemicals consumed in lab testing.

Contract research expenses represent amounts paid to third parties for research conducted on the taxpayer’s behalf. Under IRC Section 41 and R.C. 5733.351, only 65% of contract expenses are generally qualifying. To include these, the taxpayer must prove they retained “substantial rights” to the research and bore the “economic risk of loss” if the research was unsuccessful.

Transition from Corporation Franchise Tax to the Commercial Activity Tax

The most significant event in the life of Section 5733.351 was the phase-out of the Corporation Franchise Tax and the introduction of the Commercial Activity Tax (CAT) beginning in 2005. This transition created a “legacy” status for Section 5733.351 while giving birth to a nearly identical statute, Section 5751.51, which governs the credit for CAT purposes.

Carryforward Protection and the Bridge Mechanism

As the CFT was repealed, many corporations held significant amounts of unused R&D credits generated under Section 5733.351. The General Assembly enacted specific language in both 5733.351(B)(3) and 5751.51(B)(3) to ensure these credits were not lost. A corporation subject to the phase-out could carry forward any credit not fully utilized by tax year 2008 and apply it against the tax levied by Chapter 5751 (the CAT).

However, this transition came with a strict limitation: the total number of taxable years under the CFT and calendar years under the CAT for which the credit is carried forward shall not exceed seven. This means the “clock” did not restart when the credit moved from the franchise tax to the commercial activity tax.

Section 5751.51: The Modern Incarnation

For tax years beginning on or after January 1, 2008, the R&D credit is primarily claimed under Section 5751.51. The language of 5751.51 almost perfectly mirrors 5733.351, maintaining the 7% rate and the incremental calculation based on a three-year average of Ohio QREs.

The Commercial Activity Tax itself is a privilege tax on the total amount realized by a person from the sale of goods or services, sitused to Ohio. The R&D credit serves as a vital nonrefundable offset against this liability. For tax years 2024 and 2025, the CAT underwent major changes, increasing the exclusion threshold from $1 million in taxable gross receipts to $3 million in 2024 and $6 million in 2025. Despite these shifts, the R&D tax credit remains a permanent fixture of the CAT code.

Local State Revenue Office Guidance and Interpretive Standards

The Ohio Department of Taxation (ODT) serves as the “local state revenue office” with authority over Section 5733.351 and its successors. ODT guidance is issued through Administrative Code rules, Information Releases, and Final Determinations issued by the Tax Commissioner. These documents provide the “meat” to the statutory “bones,” explaining how the law is applied during audits.

Ohio Administrative Code Rule 5703-29-22

The ODT codified the application of the R&D credit in O.A.C. 5703-29-22. This rule provides essential procedural guidance that often overrides a taxpayer’s federal reporting habits.

First, the rule clarifies the reporting period. Regardless of a taxpayer’s federal taxable year (which might end in June or September), the Ohio R&D credit must be computed based on expenses incurred during the calendar year (January 1 through December 31). This often requires taxpayers to perform a specific “cut-off” analysis to isolate Ohio expenses into the correct calendar year.

Second, the rule dictates the filing frequency. For CAT purposes, the credit must first be claimed on the annual return, which is the fourth-quarter return due in February of the following year. If the credit exceeds the liability on that return, it can then be carried forward to subsequent quarterly returns.

Third, the rule addresses the sequencing of credits. Section 5751.98 of the Revised Code dictates the order in which multiple credits must be claimed. The R&D credit is nonrefundable and must be taken after certain other credits (like the Jobs Retention Credit) but before the carryforward of the same credit from a prior year.

The Geographic Imperative: “Incurred in This State”

One of the most frequent sources of audit assessments is the “jurisdictional and geographical distinction” between the federal and state credits. Under Section 5733.351(B) and Section 5751.51(B), only qualified research expenses incurred in the State of Ohio are eligible.

In Final Determinations such as the Cristal USA (INEOS Pigments) case, the Tax Commissioner has strictly enforced this rule. The petitioner in that case claimed credits for plant trial activities and R&D conducted at its Ohio manufacturing facilities. However, the ODT’s audit staff denied the credits because the taxpayer could not sufficiently document that the specific activities—and the corresponding employee wages—occurred physically within Ohio. The Department noted that meeting the federal definition of a QRE is not sufficient; the taxpayer must also meet the state’s geographic nexus requirement.

The “Strict Construction” Doctrine

The ODT and the Ohio Board of Tax Appeals (BTA) apply a “strict construction” standard to all tax reduction statutes, including R.C. 5733.351. Under Ohio law, the taxpayer must demonstrate a “clear entitlement” to the credit. If there is any doubt or lack of substantiation, the law is interpreted in favor of the taxing authority and against the taxpayer. This puts a heavy burden of proof on the company claiming the R&D credit, requiring meticulous record-keeping.

Audit and Substantiation: Lessons from Final Determinations

The ODT’s enforcement of Section 5733.351 and Section 5751.51 is revealed through its audit practices. These audits often focus on the quality of documentation and the “nexus” between the expenses and the research activity.

The Problem of High-Level Summaries

A common mistake highlighted in ODT Final Determinations is the reliance on high-level project summaries or general employee rosters. In the Alliance Industries determination, the claimant sought a refund based on QRE credits but was denied because it failed to provide contemporaneous records linking specific wages to qualified research.

The ODT consistently rejects “estimates” of time spent on R&D if they are not backed by evidence. While the IRS has sometimes accepted “project-based” estimates, the ODT often requires more granular proof, such as lab notebooks, innovation logs, time-tracking software entries, or CAD modeling records that show the specific “Process of Experimentation” occurring.

Record Retention Requirements

Taxpayers claiming a qualified research expense credit must adhere to strict record retention rules. Section 5751.51(D) and various Information Releases (e.g., CAT 2006-09) require taxpayers to retain all records used in the calculation of the credit for at least four years after the return was actually filed or its due date, whichever is later.

Crucially, because the credit is based on a three-year rolling average, the taxpayer must also retain records for those three preceding years to substantiate the “base amount”. If a taxpayer undergoes an audit in 2024 for a credit claimed in 2020, they may effectively need records dating back to 2017 to justify the three-year average used in the 2020 calculation.

Audit Sampling and Good Faith Efforts

The Tax Commissioner has the authority to audit a “representative sample” of a taxpayer’s qualified research expenses. According to Section 5751.51(E), the Commissioner must make a “good faith effort” to reach an agreement with the taxpayer on selecting this sample. However, if no agreement is reached, the Commissioner is not precluded from proceeding with the audit using their own sampling methodology. This underscores the importance of a cooperative relationship between the taxpayer’s tax team and the state’s auditors.

Detailed Calculation Example: “Ohio Precision Manufacturing, LLC”

To illustrate the meaning and application of Section 5733.351 (as it flows into current law), we will examine a hypothetical scenario for “Ohio Precision Manufacturing, LLC” (OPM).

Background and Data

OPM is a manufacturer of advanced aerospace components based in Akron, Ohio. In 2024, they increased their investment in developing a new lightweight alloy. All research was performed in their Ohio laboratory.

• 2024 Ohio QREs (Current Year): $2,500,000
• 2023 Ohio QREs: $1,800,000
• 2022 Ohio QREs: $1,500,000
• 2021 Ohio QREs: $1,300,000
• Unused Legacy Credit (from 5733.351 CFT era): $40,000 (currently in its 6th year of carryforward).
• 2024 CAT Liability (after exclusion): $120,000.

Step 1: Calculate the Base Amount

The base amount is the average of the qualified research expenses incurred in Ohio for the three preceding taxable years.

Base Amount = ($1,800,000 + $1,500,000 + $1,300,000) / 3 = $1,533,333.33

Step 2: Calculate Excess QREs

The excess is the amount by which current year Ohio QREs exceed the base amount.

Excess QREs = $2,500,000 – $1,533,333.33 = $966,666.67

Step 3: Compute the Current Year Credit

The credit rate is a flat 7% of the excess.

Credit = $966,666.67 x 0.07 = $67,666.67

Step 4: Application and Sequencing

OPM must apply its credits against its $120,000 CAT liability according to the statutory order.

1. Legacy Credit (Section 5733.351): Because it expires sooner (7-year limit), the $40,000 legacy carryforward is applied first.

• Remaining Liability: $120,000 – $40,000 = $80,000.

2. Current Year Credit (Section 5751.51): The current credit of $67,666.67 is applied next.

• Remaining Liability: $80,000 – $67,666.67 = $12,333.33.

3. Final Result: OPM pays $12,333.33 in CAT for the period. All R&D credits for 2024 are fully utilized, so there is no carryforward to 2025.

If OPM’s 2024 credit had been $100,000, it would have wiped out the $80,000 remaining liability and had a $20,000 carryforward for the next seven years.

Special Considerations for Consolidated Groups and Financial Institutions

The application of Section 5733.351 and Section 5751.51 becomes significantly more complex in the context of large corporate groups and specialized industries.

Consolidated Elected Taxpayers and Combined Taxpayers

Under the CAT, businesses can choose to file as “consolidated elected taxpayers” or “combined taxpayers.” Section 5751.51(C) requires that each person in the group separately calculate their credit using their own Ohio QREs. This prevents companies from aggregating the research of an out-of-state subsidiary into the Ohio base.

Furthermore, a taxpayer may only claim the credit with respect to persons who were members of the group as of December 31 of the year the expenses were incurred. For carryforwards, the entity must be a member of the group as of the last day of the tax period for which the return claiming the credit is filed. This “membership rule” requires careful tracking during mergers and acquisitions to ensure that R&D credits remain available to the correct filing group.

The Financial Institutions Tax (FIT) and Legacy Credits

When Ohio shifted financial institutions from the franchise tax to the FIT (Chapter 5726) in 2014, it ensured the continuity of R&D incentives. Section 5726.56(D) specifically allows financial institutions to claim against the FIT any “unused portion of a credit authorized under section 5733.351”. This provides a 20-year lookback bridge (effectively) for banks that may have generated significant R&D credits in their data processing or software development divisions during the early 2000s and were unable to use them before the tax regime changed.

The Impact of Internal-Use Software (IUS)

In the modern economy, much of the research conducted in Ohio—especially by financial institutions and tech companies—revolves around software development. The Law Review analysis of the Ohio QRE credit notes that “Internal-Use Software” (IUS) faces a higher threshold for qualification. In addition to the four-part test, IUS must generally be:

• Innovative (resulting in a significant reduction in cost or improvement in speed).
• Involve Significant Economic Risk (substantial resources committed with uncertainty of recovery).
• Not be Commercially Available.

ODT auditors frequently scrutinize software claims to distinguish between “qualified research” and “routine coding” or “system maintenance”.

Comparative Context: Ohio vs. Federal and Other States

While Ohio’s 7% incremental credit is robust, it exists within a competitive national environment for R&D investment. Understanding these differences helps articulate why the Ohio statute’s simplicity is a strategic advantage.

Ohio’s 7% rate is generally considered high for an incremental state credit, especially given the simplified three-year average base. Furthermore, unlike some states that require a formal application or “certification” from a Department of Development, Ohio allows taxpayers to claim the credit directly on the tax return with no prior approval, subject only to audit.

Recent Legislative and Judicial Developments

The meaning of Section 5733.351 continues to be shaped by current events and new legislation.

House Bill 33 and the CAT Overhaul

The most recent budget bill, House Bill 33 of the 135th General Assembly, significantly altered the Commercial Activity Tax by eliminating the Annual Minimum Tax (AMT) and raising the exclusion thresholds. For many small and medium-sized businesses, their CAT liability will effectively drop to zero. However, for those still subject to the tax (those with over $6 million in Ohio receipts starting in 2025), the R&D tax credit remains a vital tool. The statute for the credit was reenacted and updated to ensure it remains functional within this new higher-threshold environment.

Federal R&D Expensing and the “One Big Beautiful Bill”

At the federal level, recent changes (and proposed restorations) regarding the immediate expensing of R&D costs under Section 174 have created significant noise. Starting in 2022, federal law required R&D costs to be capitalized and amortized over five years. Because R.C. 5733.351 and 5751.51 link to federal definitions, there was concern about how this would affect the timing of the Ohio credit. However, administrative guidance generally suggests that the credit remains based on the expenses incurred during the year, even if those expenses must be capitalized for deduction purposes on a federal income tax return.

The Park-Ohio Refund Case

The Park-Ohio Holdings Corp. v. United States case, while federal, is being closely watched by Ohio tax practitioners. The IRS has attempted to raise the bar for refund claims, requiring line-by-line, person-by-person explanations of R&D work. If the IRS prevails, it is highly likely the Ohio Department of Taxation will adopt even more stringent “paper-only” audit standards for claims under R.C. 5751.51, making contemporaneous documentation an absolute necessity rather than a best practice.

Synthesis and Compliance Recommendations

The legacy of Section 5733.351 is one of strategic continuity. By creating a 7% incremental credit and ensuring its survival through the most massive tax overhaul in state history, Ohio has signaled to the business community that R&D investment is a long-term priority. However, the “strict construction” of the law by the ODT means that the credit is only as strong as the documentation supporting it.

For professional peers and corporate tax departments, compliance with the meaning of Section 5733.351 and its modern successors requires a three-pronged strategy:

First, geographic isolation is paramount. Taxpayers must be able to prove that research was “incurred in this state”. This requires more than just an Ohio address; it requires evidence that the employees were in Ohio and the supplies were used in Ohio.

Second, the “Four-Part Test” must be documented at the project level. High-level summaries will not survive an ODT field audit. Companies should maintain an “innovation log” or a similar technical repository that captures the uncertainties identified and the alternatives evaluated during the “Process of Experimentation”.

Third, record retention must account for the rolling base period. Because the current year’s credit is inextricably linked to the prior three years’ spending, a deficiency in documentation from four years ago can disqualify a credit claimed today.

Ultimately, Section 5733.351 is far more than a “former” statute. it is the bedrock upon which Ohio’s current innovation economy is built. Its 7% rate, 7-year carryforward, and federal linkage provide a powerful, yet demanding, incentive for those willing to meet the rigorous substantiation standards set by the Ohio Department of Taxation. Through a nuanced understanding of these statutory mechanics and administrative guidelines, taxpayers can successfully navigate the complexities of Ohio’s R&D tax landscape and secure significant fiscal benefits for their state-based research initiatives.