Commercial Activity Tax (CAT)

Comprehensive Analysis of the Commercial Activity Tax Framework

The Commercial Activity Tax represents a fundamental shift in state-level fiscal policy, moving away from traditional corporate income taxation toward a broad-based gross receipts model. Enacted in 2005 under House Bill 66, the CAT was designed to broaden the tax base while maintaining a low marginal rate of 0.26 percent. This structural choice ensures that almost all business types—including C-corporations, S-corporations, partnerships, and limited liability companies—contribute to the state’s General Revenue Fund based on their volume of economic activity rather than their bottom-line profitability. Unlike an income tax, which may yield zero revenue from a company experiencing a loss, the CAT ensures that any entity benefiting from the Ohio marketplace and infrastructure contributes to the state’s fiscal health.

The tax applies to taxable gross receipts (TGR), defined as the total amount realized by a person from the sale or exchange of property, the performance of services, or the use of an asset. A defining characteristic of the CAT is its situsing rules, which determine whether a receipt is considered an “Ohio” receipt. For tangible personal property, receipts are sitused to Ohio if the property is received in the state by the purchaser. For services, the receipts are sitused based on the location where the purchaser receives the benefit of the service. This market-based sourcing approach ensures that out-of-state companies with substantial sales into Ohio are subject to the same tax burdens as domestic companies, provided they meet the standards of substantial nexus.

Evolution of the Substantial Nexus Standard

The legal threshold for becoming a CAT taxpayer is governed by the concept of “substantial nexus.” Ohio utilizes a bright-line presence test to determine when an out-of-state entity becomes liable for the CAT. An entity is deemed to have a bright-line presence if, at any time during the calendar year, it meets specific property, payroll, or sales requirements. The legislative intent behind these thresholds is to provide clarity and predictability for businesses while ensuring that those with significant economic engagement in the state fulfill their tax obligations.

Bright-Line Presence Category	Requirement for Nexus
Ohio Property	Value of $50,000 at any time during the year
Ohio Payroll	Wages/Compensation paid $50,000 to Ohio employees
Ohio Taxable Gross Receipts	Total Ohio-sourced receipts $500,000
Apportionment Ratio	25% of total property, payroll, or sales located in Ohio
Legal Domicile	The entity is headquartered or legally based in Ohio

Table 1: Standards for establishing a bright-line presence and substantial nexus in Ohio.

The Department of Taxation emphasizes that even if an entity does not meet the bright-line presence thresholds, it may still be subject to the CAT if it is domiciled in Ohio or otherwise has a physical presence that satisfies the dormant Commerce Clause requirements of the U.S. Constitution. However, the 2024 and 2025 legislative updates have introduced a significant layer of exclusion that effectively removes many nexus-qualifying businesses from the actual tax-paying population.

Legislative Reforms and the Elimination of the Annual Minimum Tax

The passage of Am. Sub. House Bill 33 by the 135th General Assembly marked the most significant restructuring of the CAT since its inception. Faced with a substantial budget surplus, Ohio lawmakers sought to provide relief to small and medium-sized enterprises by dramatically increasing the amount of revenue a business can generate before owing any tax. The centerpiece of this reform was the phased increase in the annual exclusion and the total elimination of the Annual Minimum Tax (AMT).

Historically, the AMT was a fixed fee that every registered taxpayer was required to pay regardless of their specific tax calculation. This fee was tiered based on the previous year’s total taxable gross receipts. For the period between 2014 and 2023, these tiers ensured that even the smallest businesses contributed at least $150 per year.

Prior Total Taxable Gross Receipts	Annual Minimum Tax (AMT) Amount (2014-2023)
$1 Million	$150
$1 Million but $2 Million	$800
$2 Million but $4 Million	$2,100
$4 Million	$2,600

Table 2: Historical Annual Minimum Tax (AMT) tiers based on taxable gross receipts prior to 2024.

Effective January 1, 2024, the AMT was entirely abolished. Taxpayers no longer pay a fixed fee for the privilege of holding a CAT account; instead, they only pay the 0.26 percent rate on receipts that exceed the vastly expanded exclusion amounts.

Taxable Year	Annual Exclusion Threshold	Marginal Tax Rate on Excess
2023 and Earlier	$1,000,000	0.26%
2024	$3,000,000	0.26%
2025 and Thereafter	$6,000,000	0.26%

Table 3: Phased escalation of the Commercial Activity Tax annual exclusion thresholds.

The implication of this change is profound: by 2025, approximately 90 percent of current CAT taxpayers are expected to be exempt from the tax entirely, as their Ohio-sourced revenue falls below the $6 million mark. This reform shifts the CAT into a tax primarily focused on large-scale commercial entities while reducing the administrative and financial burden on the state’s small business community.

The Ohio Research and Development Investment Tax Credit

The Ohio Research and Development (R&D) Investment Tax Credit, codified in Ohio Revised Code (ORC) Section 5751.51, serves as the state’s primary incentive for fostering technological innovation. By allowing businesses to offset their CAT liability through qualifying research expenditures, the state encourages the retention of high-value engineering, scientific, and technical jobs within Ohio. The credit is specifically designed as an incremental incentive, meaning it rewards businesses for increasing their R&D footprint over time rather than simply maintaining a static level of investment.

Defining Qualified Research Under Section 5751.51

To maintain consistency with federal tax standards, Ohio law incorporates the definition of “qualified research expenses” (QREs) as found in Section 41 of the Internal Revenue Code (IRC). This statutory alignment means that businesses can generally leverage their federal R&D tax credit studies to support their Ohio claims, provided they can isolate the expenses incurred specifically within the state of Ohio.

For an activity to qualify, it must meet the federal “Four-Part Test” as established by the IRS and interpreted by the Ohio Department of Taxation:

1. Permissible Purpose: The research must be intended to develop a new or improved business component, such as a product, process, software, technique, formula, or invention.
2. Elimination of Uncertainty: The activity must be undertaken to discover information that would eliminate uncertainty regarding the capability, method, or appropriate design for developing or improving the business component.
3. Process of Experimentation: The taxpayer must evaluate one or more alternatives through a systematic process, such as modeling, simulation, or trial and error.
4. Technological in Nature: The research must fundamentally rely on principles of the physical sciences, biological sciences, engineering, or computer science.

Ohio’s application of this definition is strict: the research must be performed in this state to be included in the Ohio QRE calculation. This location-based requirement is the primary differentiator between the federal and state calculations.

Categorization of Eligible Expenses

Qualified research expenses are categorized into two primary buckets for the purpose of the CAT credit calculation:

• In-House Research Expenses: This includes wages paid to employees who are directly involved in research, as well as those who directly supervise or support research activities. It also encompasses the cost of supplies used in the conduct of qualified research, excluding land or improvements to real property.
• Contract Research Expenses: This includes amounts paid to third parties for the performance of qualified research on behalf of the taxpayer. Following federal guidelines, only 65 percent of these payments are typically includable in the credit base.

Expense Category	Includable Components	Statutory Limitation
Wages	Salaries, bonuses, and stock options for R&D personnel	Only for time spent on qualifying activities
Supplies	Raw materials, prototype components, and chemicals	Must be consumed during the research process
Computer Costs	Payments for the use of computers for R&D (e.g., cloud computing)	Must be specifically for qualifying research
Contract Research	Payments to outside consultants, labs, or universities	Generally limited to 65% of the total invoice

Table 4: Breakdown of qualified research expenses (QREs) under ORC 5751.51 and IRC Section 41.

The Incremental Calculation Formula

The Ohio R&D credit is not a flat percentage of the total QREs. Instead, it is calculated as 7 percent of the “excess” QREs. The excess is defined as the difference between the taxpayer’s QREs in the current calendar year and the average of the taxpayer’s QREs over the three preceding calendar years.

The mathematical representation of the credit earned is as follows:

Credit = 0.07 × (QRE CY – Average(QRE PY1, QRE PY2, QRE PY3))

Where:

• QRE CY is the Qualified Research Expenses incurred in Ohio during the current calendar year.
• QRE PYn are the Qualified Research Expenses incurred in Ohio for the three prior calendar years.

If a taxpayer has no history of R&D in Ohio, the average of the three prior years is considered zero, effectively allowing them to claim 7 percent of their entire first-year spend. This “simplified” calculation method is permanent and does not expire, providing long-term certainty for growing firms.

Credit Nonrefundability and Carryforward Provisions

The R&D investment credit is nonrefundable, meaning it can only be used to reduce the amount of CAT owed. If the credit exceeds the total tax liability for a given period, the taxpayer cannot receive a check for the difference from the state. However, any unused credit amount can be carried forward for a period of seven years.

The carryforward mechanism is essential because the R&D credit is applied to the CAT liability after the exclusion amount has been utilized. In 2025, for example, a company must first have more than $6 million in Ohio receipts before the R&D credit provides any immediate financial utility. The seven-year window allows companies to “bank” credits earned during lean years or heavy R&D phases to offset future tax burdens as their commercial products reach the market and revenue grows.

Local State Revenue Office Guidance and Administrative Rules

The Ohio Department of Taxation (ODT) provides extensive guidance through Administrative Code rules and Information Releases to ensure uniform application of the law. For practitioners, navigating this guidance is critical to maintaining compliance and surviving audits.

The CAT CS Schedule and Filing Requirements

All taxpayers claiming the R&D credit must submit the Commercial Activity Tax Credit Schedule (CAT CS). This form acts as the formal declaration of the credit and requires the taxpayer to provide specific details regarding the location and nature of the research.

Key requirements of the CAT CS include:

• Facility Identification: The taxpayer must list the physical address where the research was conducted to verify it occurred within Ohio borders.
• Three-Year Comparison: The schedule provides dedicated lines for entering the current year’s expenses and the three prior years’ expenses to calculate the average.
• Tracking the Balance: The form tracks the opening unused credit balance, the credits earned during the current period, the credits actually claimed against the tax, and the final closing balance to be carried forward.

Starting in 2024, the ODT has mandated that the R&D credit must be claimed on the fourth-quarter return (due in February) for the year in which the expenses were incurred. While the expenses are tracked throughout the year, the formal credit generation occurs on a calendar-year basis.

The Order of Credits (ORC 5751.98)

One of the most complex areas of ODT guidance involves the “Order of Credits.” Under ORC 5751.98, taxpayers must apply their various credits in a specific sequence to determine their final CAT liability. This hierarchy is designed to ensure that nonrefundable credits with limited carryforward periods are utilized before refundable credits or those with longer lives.

Priority Order	Credit Type	Refundable/Nonrefundable	Carryforward Period
1	Jobs Retention Credit (Nonrefundable portion)	Nonrefundable	3 Years
2	Qualified Research Expenses Credit	Nonrefundable	7 Years
3	R&D Loan Payments Credit	Nonrefundable	Unlimited
4	Unused Net Operating Losses (NOLs)	Nonrefundable	20 Years
5	Motion Picture & Broadway Credit	Refundable	N/A
6	Jobs Creation/Retention Credit	Refundable	N/A

Table 5: Statutory order for claiming Commercial Activity Tax credits under ORC 5751.98.

Understanding this order is critical for tax planning. For instance, if a company has a large Jobs Retention Credit that expires in three years, that credit must be used first. If the Jobs Retention Credit completely offsets the CAT liability, the R&D credit for that year cannot be used and must instead be carried forward, potentially risking the expiration of its seven-year window if the pattern continues.

Audit Sampling and Record Retention Mandates

House Bill 33 formally expanded the ODT’s authority to audit the R&D credit. The law now explicitly permits the Tax Commissioner to audit a “representative sample” of a taxpayer’s QREs to ascertain the validity of the credit claim. This allows auditors to extrapolate findings from a subset of projects across the entire credit amount, which can significantly increase the financial impact of any documentation failures.

Furthermore, the record retention period has been strictly defined as four years from the date the return was filed or the tax was due, whichever is later. Required records for an R&D claim include:

• Detailed project logs and technical documentation explaining the research goals and uncertainties.
• Payroll records, including Form W-2s and time-tracking data for R&D employees.
• Invoices and receipts for all supplies used in prototypes or testing.
• Copies of Federal Form 6765 (Credit for Increasing Research Activities) for the current year and the three-year base period.

The ODT has adopted an increasingly rigorous stance on these audits, often re-evaluating whether activities meet the IRC Section 41 definition even if the IRS has already accepted the taxpayer’s federal claim. Taxpayers are advised to maintain “bullet-proof” documentation that clearly articulates the technological challenges being solved in Ohio.

Application of the Law to Group Filers

The CAT provides unique challenges and opportunities for businesses with complex organizational structures. Companies under common ownership (more than 50 percent) are generally required to file as a group, either as a “Combined Taxpayer” or a “Consolidated Elected Taxpayer”.

Combined vs. Consolidated Status

The choice between combined and consolidated status affects how the R&D credit and the exclusion are applied:

• Combined Taxpayers: These groups include all members with substantial nexus in Ohio. They receive a single annual exclusion (e.g., $3 million in 2024) that is shared across all members. However, receipts from transactions between members are still taxable.
• Consolidated Elected Taxpayers: These groups elect to include all members with common ownership, regardless of whether they have Ohio nexus. The group receives one exclusion, and crucially, all receipts between members are excluded from the tax base.

Member-by-Member Credit Calculation

A pivotal change introduced in 2023 requires that the R&D credit be calculated on a “member-by-member” basis. Historically, some groups attempted to calculate the credit at the aggregate group level, blending the historical base of all members. Under the current law, each individual person or legal entity within the group must separately calculate its own credit using its own Ohio QREs and its own three-year average.

Once calculated, these individual credits are summed and applied to the group’s total CAT liability. This requirement prevents a group from “diluting” the base of a high-growth R&D entity by merging it with a legacy entity that has high historical research spend but low current activity. Furthermore, a group can only claim the credit for members that were part of the group on December 31 of the year the expenses were incurred.

Practical Example: Integrated CAT and R&D Credit Calculation

To demonstrate the interplay between the increasing exclusion thresholds and the R&D tax credit, consider “Columbus Precision Aerospace,” a mid-sized manufacturer with significant Ohio operations.

Scenario Baseline (Tax Year 2024)

Metric	Amount
Total Ohio Taxable Gross Receipts	$12,000,000
2024 Ohio QREs	$800,000
2021 Ohio QREs (Prior Year 3)	$450,000
2022 Ohio QREs (Prior Year 2)	$500,000
2023 Ohio QREs (Prior Year 1)	$550,000

Step 1: Determine the Gross CAT Liability

For the 2024 tax year, the exclusion amount is $3,000,000. Any receipts above this amount are taxed at 0.26 percent.

• Excess Receipts: $12,000,000 – $3,000,000 = $9,000,000
• Tax Before Credit: $9,000,000 × 0.0026 = $23,400

Step 2: Calculate the R&D Investment Credit

First, calculate the average of the three prior years’ expenses:

Base Average = (450,000 + 500,000 + 550,000) / 3 = $500,000

Next, determine the incremental increase in R&D spend and apply the 7 percent rate:

• Incremental Spend: $800,000 (Current) – $500,000 (Base) = $300,000
• Credit Earned: $300,000 × 7% = $21,000

Step 3: Final Tax Due and Carryforward

The credit is applied against the tax due:

• Net CAT Liability: $23,400 – $21,000 = $2,400

In this scenario, the manufacturer pays only $2,400 in CAT, having effectively funded its innovation through a state-sponsored tax reduction of $21,000. If the credit had been larger (e.g., $30,000), the liability would be $0, and the remaining $6,600 would be recorded on the CAT CS schedule as a carryforward for use in 2025.

The Impact of 2025: Strategic Planning for the $6 Million Exclusion

The final phase of the HB 33 reforms, effective January 1, 2025, will raise the exclusion to $6 million. This will fundamentally change the value proposition of the R&D credit for many businesses.

Cancellation vs. Retention of CAT Accounts

For businesses with receipts between $3 million and $6 million, the 2025 update means they will no longer owe CAT. The ODT recommends that such businesses take the following steps:

• Cancel the Account: If a taxpayer anticipates having $6 million or less in taxable gross receipts in 2025, they should cancel their account effective December 31, 2024. This can be done through the Ohio Business Gateway or via Form BA UF.
• Final Return: A final quarterly return for the fourth quarter of 2024 must be filed by February 10, 2025.
• Audit Readiness: Even after canceling an account, the taxpayer must retain records for four years to substantiate the exclusions and any credits claimed in previous periods.

Managing Credits During the “Non-Taxable” Period

A strategic challenge arises for companies that fall below the $6 million threshold in 2025 but expect to grow beyond it in the future. Because the R&D credit only has a seven-year carryforward, a company that stays below the threshold for several years may find its “banked” credits expiring before they can be used.

Companies in this position should continue to calculate and track their QREs each year. Even if they are not filing CAT returns because they are below the threshold, they may need to reactivate their account and file if they cross the $6 million mark. At that time, having a well-documented history of R&D investment will be vital for offsetting their newfound tax liability.

The Interaction with JobsOhio and Other State Incentives

Beyond the standard R&D credit, businesses can often stack additional incentives to maximize their savings. One such program is the Research and Development Investment Loan Fund managed by JobsOhio.

R&D Loan Repayment Credit

This program provides low-interest loans ranging from $500,000 to $5 million for R&D projects that create high-wage jobs in Ohio. Crucially, the law provides a nonrefundable CAT credit for the payments made on these loans. This credit is applied after the standard R&D credit in the order of application, providing a secondary layer of tax reduction for the state’s most intensive research projects.

R&D Sales Tax Exemption

Separate from the CAT, Ohio also offers a Research and Development Sales Tax Exemption. This provision exempts the purchase of qualified machinery and equipment from state and county sales and use tax, provided the equipment is used primarily for R&D. To claim this, the purchaser must provide a Sales and Use Tax Blanket Exemption Certificate to the vendor. When paired with the CAT R&D credit, this exemption provides both an immediate cash-flow benefit on capital purchases and a long-term tax reduction on operational revenue.

Final Thoughts: Synthesis of Policy and Practice

The Ohio Commercial Activity Tax and its accompanying Research and Development Investment Credit represent a sophisticated effort to balance state revenue needs with the imperative for economic growth. The 2024 and 2025 legislative reforms have essentially bifurcated the Ohio business community into a large group of exempt small businesses and a focused group of larger commercial entities that provide the bulk of the state’s business tax revenue.

For those larger entities, the R&D credit is not merely a tax break; it is a critical component of their competitive strategy within the Midwestern manufacturing and technology corridor. However, the shift toward more aggressive ODT auditing and the new member-by-member calculation rules for group filers necessitate a high degree of administrative rigor. Businesses must move beyond simple “look-back” studies and toward a contemporaneous compliance model that integrates project-level technical data with precise Ohio-based cost accounting.

Ultimately, the goal of the CAT-R&D nexus is to create a virtuous cycle: as companies invest in research to create better products, they grow their taxable gross receipts, and while they pay tax on that growth, they are rewarded with credits that reduce the marginal cost of their next innovation. For the professional tax practitioner or business leader, success in this environment requires a deep understanding of the statutory mechanics, a vigilant eye on legislative updates like HB 33, and a commitment to the detailed record-keeping that the Department of Taxation now demands. By mastering these nuances, Ohio-based innovators can ensure they fully capture the benefits of the state’s business-friendly tax code while mitigating the risks inherent in an evolving compliance landscape.