Connecticut partnership and S corporation research credit
Tax credit
Agency: Connecticut Departments of Economic and Community Development and Revenue Services. Agency source
This directory is not tax advice. Confirm eligibility, tax-year rules, deadlines and filing requirements with a tax professional.
New program for tax years beginning in 2026 [Connecticut Revenue 2026 enacted tax developments]
- Who qualifies
- Qualifying partnerships and S corporations with gross income no greater than $70 million, receiving DECD approval for eligible research expenditures. [Connecticut Revenue 2026 enacted tax developments]
- What it’s worth
- 6% of qualifying research expenses, up to $1.5 million per business and subject to the $25 million program cap. Eligible excess can be exchanged at 90% for biotechnology businesses or 65% for other qualifying businesses. [Connecticut Revenue 2026 enacted tax developments]
- How to claim
- Apply to DECD for a reservation, verify spending and obtain the credit voucher. Submit any refund-exchange claim with the tax return. The legislative overview does not identify a numbered form. [Connecticut Revenue 2026 enacted tax developments]
- Deadlines and application windows
- Applies to tax years beginning on or after January 1, 2026. Verify expenditures within 90 days after the tax year ends. [Connecticut Revenue 2026 enacted tax developments]
Amounts are subject to the conditions in each listing. A source review does not mean applications are open or that a business qualifies.
Official sources
Listing reviewed