Connecticut R&D Tax Credit Summary

R&D Tax Credit Available:


Eligible Entities:

C-Corporations only

Deadline for Tax Filing:

Due with Connecticut Tax Return

Data Required to Compute Credit:

  • Claim period Qualified R&D Expenses (QREs)
  • Qualified Research Expenses for Prior 1 Year

Credit Carryforward:

RC: 15 Years
RDC: Indefinitely

R&D Credit Summary:

Two credits are available for Connecticut (RC and RDC). The R&D tax credit equals:

  • Incremental - RC: Multiply 20% of the excess of the qualified research and experimental expenses during the current claim year over the qualified research and experimental expenses during the prior year.
  • Non-incremental - RDC: 6% of its research and development expenses. (Eligible for Qualified Small Businesses only)

Special Notes:

  • CT Non-incremental R&D credit (RDC) is only eligible for Qualified Small Businesses.
  • Qualified Small Business is defined as a company that has gross income of less than $100M in the previous income year.
Research Tax Credit
Important Links and Forms

Form CT-1120 RC
Form CT-1120 RDC

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