R&D Tax Credits for Controlled Groups and Ohio Businesses Under Common Control

Ohio businesses with multiple related entities may not be able to calculate the R&D Tax Credit one company at a time. Under Section 41, members of certain controlled groups and businesses under common control are generally treated as a single taxpayer when calculating the research credit. The resulting credit is then allocated among the members.

For Ohio manufacturers, software companies, engineering firms, holding-company structures, and family-owned business groups, this can affect qualified research expenses, gross receipts, Form 6765 reporting, and the amount ultimately reported by each entity.



Since 2004, RCG Tax Partners has completed more than 25,000 R&D tax credit studies and identified over $750 million in tax savings. Its team includes CPAs, tax specialists, engineers, technical writers, and architects who support R&D Tax Credit studies with technical activity analysis, qualified expense review, and detailed supporting documentation.

The Core Rule: Calculate the Credit at the Group Level  

For purposes of Section 41, applicable members of a controlled group or businesses under common control are treated as one taxpayer when the credit is calculated.

That means the group generally needs to aggregate relevant qualified research expenses, or QREs, before determining the credit. The group credit is then allocated among members based on their proportionate share of the aggregate QREs taken into account for the credit.



This is different from simply calculating a separate R&D credit for each legal entity and adding the results together.

When Separate Companies Can Still Be One R&D Credit Group  

Separate corporations, LLCs, or operating companies can still fall within the controlled group R&D tax credit rules when ownership and common-control requirements are met.

The R&D credit analysis should therefore begin with ownership structure, not just the tax return each entity files.

For an Ohio business group, useful early questions include:

• Which entities are under common ownership or control?
• Which entities incurred qualified research expenses?
• Which entities generated the gross receipts used in the calculation?
• Did ownership change during the year?

Answering these questions before the credit calculation helps determine the correct group population.

How Is the R&D Credit Allocated?  

Once the credit is calculated for the controlled group, each member receives its share under the applicable allocation rules.

Current Form 6765 instructions state that a member’s credit is determined proportionately based on its share of the aggregate QREs taken into account by the group.

A simplified workflow looks like this:

Identify controlled-group members → Aggregate QREs → Calculate the group credit → Allocate the credit → Report each member’s share



That group-level approach is one of the biggest differences between a standard single-company R&D study and a common control R&D credit analysis.

What Does Form 6765 Require?  

Businesses that answer “Yes” to the controlled group/common control question on Form 6765 must provide an Item B attachment.



The attachment includes information such as:

The IRS also requires information about the number of group members and whether QREs are being reported through a consolidated return or separate returns. 

Controlled Groups and Section G Reporting  

The newer Form 6765 business-component rules make controlled-group analysis even more important.

When Section G applies, the 80%/Top 50 business-component determination is generally made at the controlled-group level. However, a group member filing a separate return reports its own applicable QREs in Sections F and G rather than the group’s combined amounts.

That means Ohio businesses need documentation that works at both levels:



Group level: ownership, aggregate QREs, calculation method, and allocation.

Entity level: projects, employees, supplies, contractors, and business components attributable to each filing member.

Common Controlled-Group R&D Credit Problems  

Related businesses can create reporting issues when the ownership structure is not reviewed before the study begins. Common problems include:

•  Leaving an applicable entity out of the controlled group
• Calculating credits independently when aggregation is required
• Omitting an entity’s QREs from the group calculation
• Using inconsistent credit calculation methods across members
• Allocating the group credit incorrectly
• Failing to connect project documentation to the entity performing the research
• Overlooking ownership changes, acquisitions, or dispositions

The IRS also requires controlled-group members to conform to the designated member’s applicable computation method. 

What Documentation Should Ohio Business Groups Maintain?  

A related companies research credit study may require more than technical project files alone.

Useful records can include ownership charts, entity-level QRE schedules, payroll records, project lists, technical narratives, supply records, contract research expenses, gross-receipts information, and credit-allocation workpapers.



For Ohio businesses with engineering or research spread across multiple operating entities, these records help connect technical activity to both the entity-level expenses and the final group calculation.

FAQs About Controlled Group R&D Tax Credits  

Review Ownership Before Calculating the R&D Credit  

For Ohio businesses, the controlled group R&D tax credit rules make ownership structure an important part of the credit analysis. Related companies may need to aggregate QREs, calculate the credit at the group level, and then allocate the resulting credit among members.



RCG Tax Partners supports Ohio businesses with R&D Tax Credit studies that include technical activity analysis, qualified expense review, project documentation, and reporting support for businesses and their CPAs.