Section 45Q Carbon Capture Tax Credit: Complete Guide
Section 45Q is the most valuable per-unit tax credit in the IRA for carbon capture, utilization, and storage (CCUS) projects. The IRA raised credit rates, dramatically lowered capture thresholds, and made 45Q transferable, turning a previously niche credit into a primary incentive for industrial decarbonization and direct air capture development. The One Big Beautiful Bill Act (P.L. 119-21) then gave utilization and enhanced oil recovery the same rate as geologic storage for newer equipment, and added foreign-entity restrictions.
What Is Section 45Q?
Section 45Q of the Internal Revenue Code provides a per-metric-ton federal tax credit for carbon dioxide (CO2) and other carbon oxides that are captured and either: (a) geologically sequestered in secure formations, or (b) utilized in qualified industrial processes. The credit is claimed annually over a 12-year period from the date the carbon capture equipment is placed in service.
Originally enacted in 2008 and significantly enhanced by the Bipartisan Budget Act of 2018, the IRA made the most substantial changes to 45Q in its history, raising maximum rates, reducing minimum capture thresholds by 80–90%, and adding transferability and direct pay.
45Q Credit Rates: Complete Table
| Category | Storage Rate | Utilization / EOR Rate | Min Capture/yr |
|---|---|---|---|
| Industrial CCUS | $85/ton | $85/ton | 12,500 metric tons |
| Power Generation | $85/ton | $85/ton | 18,750 metric tons |
| Direct Air Capture (DAC) | $180/ton | $180/ton | 1,000 metric tons |
Rates shown are for carbon capture equipment placed in service after July 4, 2025, for which the One Big Beautiful Bill Act (P.L. 119-21) set utilization and enhanced oil recovery equal to geologic storage. Equipment placed in service earlier keeps the prior utilization and EOR rates ($60/ton, or $130/ton for DAC). Rates are adjusted for inflation for taxable years beginning after 2026. All rates require prevailing wage compliance for maximum credit; non-prevailing-wage rate is 20% of the above. Credit period: 12 years from placed-in-service date. Source: IRC §45Q as amended by P.L. 119-21.
DAC vs. Industrial CCUS: Key Differences
The 45Q credit applies to two fundamentally different types of carbon removal:
Industrial CCUS
- Point-source capture from industrial facilities (cement, steel, ethanol, power plants)
- CO2 must exceed 12,500 metric tons/year capture
- Credit: $85/ton for storage, utilization or EOR (equipment placed in service after July 4, 2025)
- More established technology, lower cost per ton
- Infrastructure: pipeline access to storage or utilization site required
Direct Air Capture (DAC)
- Removes CO2 directly from ambient atmosphere
- Minimum capture: 1,000 metric tons/year (very low threshold)
- Credit: $180/ton for storage or utilization (equipment placed in service after July 4, 2025)
- Provides net-negative emissions — higher climate value
- Current cost: $300–$1,000/ton (CAPEX-intensive, improving rapidly)
Monetizing 45Q: Transferability and Direct Pay
Section 45Q is one of only a handful of IRA credits eligible for the "broad" direct pay — meaning any entity (including for-profit corporations) can elect to receive the 45Q credit as a direct cash refund for the first five years.
This is a unique provision that distinguishes 45Q from ITC and PTC, which only allow direct pay for tax-exempt entities. A corporation developing a CCUS facility can elect direct pay for years 1–5 and then switch to either tax equity or transferability in years 6–12.
Transferability allows developers to sell 45Q credits in the secondary market at approximately 90–95 cents per dollar. For a 100,000 ton/year industrial CCUS facility at $85/ton, that's $8.5M/year in annual credits — sold via transferability for approximately $7.65–8.1M in annual cash.
Recapture Risk: What Developers Must Know
The primary risk in 45Q projects is recapture — if CO2 that was claimed under the geological storage credit leaks from the storage formation during the credit period, the developer may be required to repay a portion of the claimed credits.
Treasury regulations require annual reporting on storage site integrity to both the IRS and EPA. Third-party monitoring, reporting, and verification (MRV) using EPA-approved methods is mandatory. Developers typically purchase recapture insurance to protect against this risk.
Utilization credits for uses such as concrete curing, where the CO2 is incorporated into a material or converted to a new substance, carry different leakage risk than geological storage. Enhanced oil recovery injects CO2 underground, so treat it like storage when assessing recapture risk.
Frequently Asked Questions
What is the Section 45Q credit rate in 2026?
For carbon capture equipment placed in service after July 4, 2025, the One Big Beautiful Bill Act (P.L. 119-21) set one rate for every use: $85/metric ton for carbon captured and geologically sequestered, utilized, or used for enhanced oil recovery (EOR), and $180/metric ton for direct air capture (DAC). Equipment placed in service earlier keeps the prior utilization and EOR rates of $60/metric ton, or $130 for DAC. These rates require prevailing wage and apprenticeship compliance, and are adjusted for inflation for taxable years beginning after 2026.
What is the minimum capture threshold for Section 45Q?
The IRA significantly lowered the minimum capture thresholds. For industrial facilities: 12,500 metric tons per year (down from 100,000). For direct air capture: 1,000 metric tons per year. For electric generating units: 18,750 metric tons per year.
Is Section 45Q transferable?
Yes. Section 45Q is one of the IRA credits eligible for both transferability (Section 6418) and direct pay (Section 6417). The broad direct pay provision allows any entity — including for-profit corporations — to elect direct payment for 45Q for the first five years of the credit period.
What is direct air capture (DAC) and why is the 45Q rate higher?
Direct air capture removes CO2 directly from the atmosphere (rather than from industrial point sources). Because DAC removes carbon that is already in the atmosphere, providing a net negative emissions outcome, the IRA established a higher credit rate of $180/ton to reflect the higher cost and greater climate benefit. For DAC equipment placed in service after July 4, 2025, the $180 rate applies to utilization as well as geological storage; earlier equipment gets $130/ton for utilization.
What is recapture risk in a 45Q project?
If captured CO2 that was claimed for the geologic storage credit leaks back into the atmosphere during the recapture period set by Treasury regulations, the credit may be subject to recapture. Developers must file annual reports with the EPA on the integrity of geologic storage sites, and many purchase insurance against recapture risk.
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