How much cash does Connecticut pay for an unused R&D credit?

The exchange under Conn. Gen. Stat. 12-217ee is open to a company whose gross income for the prior year was $70 million or less and that has no Connecticut corporation business tax liability. A pre-profit software company usually clears both.

Only current-year credits qualify. That covers the 20 percent incremental credit under 12-217j and the non-incremental credit under 12-217n, which is a flat 6 percent for companies with prior-year gross income of $100 million or less. Credits from earlier years are outside the exchange.

The standard exchange rate is 65 percent. For a biotechnology company, Public Act 25-168 raised it to 90 percent for income years beginning on or after January 1, 2025. Whatever the rate, a company can exchange no more than $1.5 million in a year.

An illustrative example with round numbers: a SaaS company with $4 million of prior-year gross income and no Connecticut tax earns $60,000 of current-year credit across the two Connecticut credits. Exchanged at 65 percent, that is $39,000 in cash. The same $60,000 at a biotechnology company would bring $54,000.

The exchange is filed on Form CT-1120 XCH. In practice the company works out its current-year incremental and non-incremental credits, confirms it meets the gross income and no-liability tests, and then asks to swap the credit for cash.

S corporations and partnerships have their own route from 2026. Public Act 26-68, section 267, signed May 26, 2026, created a 6 percent R&D credit against the personal income tax for pass-throughs with gross income of $70 million or less, for tax years from January 1, 2026. The business reserves that credit in advance through a DECD voucher, subject to a $1.5 million limit per business and $25 million statewide, and it can be exchanged at 65 percent, or 90 percent for biotech.

At 65 percent, every $100 of credit becomes $65. The missing $35 is the price of getting money now instead of waiting for a year when the company owes Connecticut tax. Whether that trade beats waiting is a planning call for the CPA.

For pass-throughs the statewide $25 million limit adds a timing factor: the credit is reserved in advance through the voucher, so the reservation happens long before the return is prepared, and a pass-through that plans to exchange should put it on the calendar early.

An exchange turns a credit into a check, and Connecticut can review the research and expenses that produced that credit. Both Connecticut credits start from qualified research, so the support has to show what was built, what uncertainty the team worked through, and who was paid to do it.

R&D Binder produces the federal Section 41 documentation from your commit history and payroll, and the Connecticut claim rests on that same research. Your CPA files the forms, and whether your facts qualify is your CPA's call.

• Connecticut's R&D credit (full overview)
• Connecticut R&D credit rate
• Connecticut vs the federal credit
• The Section 41 four-part test
• What is a qualified research expense (QRE)?
• Form 6765 and Section G
• Delaware R&D credit
• Iowa R&D credit

• Connecticut General Statutes chapter 208 (2026 supplement), including 12-217j, 12-217n and 12-217ee - Connecticut General Assembly
• Connecticut Form CT-1120 XCH (Rev. 12/25), research and development credit exchange - Connecticut Department of Revenue Services
• Connecticut Public Act 26-68, section 267 (R&D credit for S corporations and partnerships) - Connecticut General Assembly
• Aprio: State R&D tax credits, recent updates and impacts (August 18, 2025) - Aprio
• CBIZ: Connecticut bill expands R&D credit (July 15, 2026) - CBIZ