Maine inventionINDEX September 2026: 0.99% (C- grade)

The inventionINDEX measures innovation output by comparing GDP growth with patent production growth.

Anything over C grade is positive sentiment; anything under C is negative outlook/sentiment. Using that sentiment, it is possible to observe trends over time, and also compare states/countries. In doing so, we can predict which states have the best chance to recover economically from the pandemic (or any other economic incident that may occur).

Historical Maine inventionINDEX Scores

The Maine inventionINDEX score for the past 12 months is shown in the table below.

The Maine inventionINDEX reached 0.99% in September 2026, earning a C- rating and reflecting a positive shift after consecutive months of stagnation. This result represents an 11 basis point improvement over both July and August 2026, which sat at 0.88% with a D+ rating. Furthermore, the September score pushes Maine back above its 60-month historical mean of 0.93%. This recent upward trajectory signals a welcome recovery from the spring dip in April 2026, when the metric sank to 0.71% and received an F rating.

Evaluating this recent performance against the broader five-year dataset reveals a market operating near its long-term average, though well below historic peaks. The 60-month period saw its apex in March 2024 with a score of 1.78% and an A+ grade, closely followed by October 2023 at 1.50% and May 2023 at 1.44%. Conversely, the dataset shows that lower grades have historically dominated the timeline, with D+ appearing 23 times and F appearing 12 times. Against this backdrop, September 2026 demonstrates encouraging stability relative to historical lows of 0.65% recorded in September 2023, February 2023, and November 2021.

Achieving higher inventionINDEX scores yields significant economic and structural benefits for the region. Elevated grades, particularly those in the B and A tiers observed in late 2023 and early 2024, indicate robust technological progress, strong patent generation, and expanding commercialization pipelines. Higher scores cultivate an environment that attracts institutional investment, secures research grants, and retains skilled technical talent within Maine. A top-tier rating serves as a reliable indicator to venture partners that local startup ecosystems and research facilities possess high commercial vitality.

In contrast, persistent pullbacks into lower scoring tiers carry noticeable drawbacks for state economic growth. Dips into the D and F ranges signal constrained innovation output, reduced venture funding, and potential barriers to technical development. Extended periods of suppressed ratings can lead to capital flight, where investors reallocate resources to more active markets, leaving local entities with diminished support. Rebounding into C- territory helps mitigate these operational risks, ensuring Maine maintains sufficient momentum to avoid long-term developmental stagnation.

Discussion:

In September, the Maine inventionINDEX scored a negative sentiment which was higher than the previous year’s average and outperformed the downward trend for the year. This is in contrast to the prior 12 months, which experienced an upward trend.

As the economy continues to stabilize in the post-pandemic era, it remains uncertain whether any backlog of applications still exists or if the department has returned to normal processing timelines. The inventionINDEX could also be affected by lingering consequences from the pandemic, such as company closures, reduced workforces, and limited R&D capabilities, which may still be impacting current operations.

Learn More:
Are you thinking of patenting any of your bright ideas? Did you know your research work could be eligible for the R&D Tax Credit and you can receive up to 14% back on your expenses? To find out more, please check out our free online eligibility test.

Swanson Reed’s Maine office provides R&D tax credit consulting and advisory services to Portland, Lewiston, Bangor, South Portland and Auburn

Feel free to book a quick teleconference with one of R&D tax specialists if you would like to learn more about R&D tax credit opportunities.

Who We Are:

Swanson Reed is the largest Specialist R&D tax credit advisory firm in the United States. With offices nationwide, we are one of the only firms globally to exclusively provide R&D tax credit consulting services to our clients. We have been exclusively providing R&D tax credit claim preparation and audit compliance solutions for over 30 years.

Swanson Reed hosts daily free webinars and provides free IRS CE and CPE credits for CPAs. For more information please visit us at www.swansonreed.com/free-webinars or contact your usual Swanson Reed representative.