November 16, 2023
5 min read

In-Depth Look: Tax Credits under Inflation Reduction Act

The Inflation Reduction Act (IRA) created 11 transferable tax credits.

Key features of the IRA's 11 transferable tax credits

The Inflation Reduction Act (IRA) created 11 transferable tax credits to promote investment into clean energy. This article summarizes key features of each transferable credit including technology, duration, period of availability, and rates. Depending on the credit, we included three rates:

  • Base: Rate assuming prevailing wage and apprenticeship requirements are not met.
  • Full: Rate assuming prevailing wage and apprenticeship requirements are met. The full rate is five times higher than the base rate.
  • Bonus: Additional rates assuming bonus credits – energy community, domestic content, low-income community – are met.

Jump directly to a credit

To jump directly to a credit, click the link below:

  • §45 PTC – Electricity produced from certain renewable sources
  • §45Y PTC – Clean electricity production credit (technology-neutral PTC)
  • §48 ITC – Energy credit
  • §48E ITC – Clean electricity investment credit (technology-neutral ITC)
  • §30C ITC – Alternative fuel vehicle refueling property credit
  • §45U PTC – Zero-emission nuclear power production credit
  • §45Q PTC – Credit for carbon oxide sequestration
  • §45Z PTC – Clean fuel production tax credit
  • §45V PTC – Clean hydrogen production tax credit
  • §48C ITC – Advanced energy project credit
  • §45X PTC – Advanced manufacturing production tax credit

Pending guidance

Although the IRA is more than a year old, several credits and adders are still awaiting key guidance:

  • Domestic content: The domestic content bonus/adder is  awaiting final guidance. We expect this guidance in Q1 2024.
  • §45X PTC: The advanced manufacturing production tax credit is awaiting final guidance. According to a September press release, Treasury expects to release guidance "before the end of the year."
  • §48C ITC: The advanced energy project credit is awaiting final guidance. According to a September press release, Treasury expects to release guidance "before the end of the year."

§45 PTC – Electricity produced from certain renewable sources

Funding mechanism: Production tax credit

Technology grouping: Electricity

Eligibility: Facilities generating electricity from wind, biomass, geothermal, solar, small irrigation, landfill and trash, hydropower, and marine and hydrokinetic renewable energy

U.S. Code: 26 U.S. Code §45

Duration: 10 years

Period of availability: Projects must begin construction in 2023 or 2024. For projects placed in service in 2025 or later, the §45Y PTC will replace the §45 PTC

Inflation adjustment: Subject to an annual inflation adjustment factor

Stackability and limitations: None

Elective pay (direct pay): Tax-exempt entities

Rates:

Base Rate Full Rate Bonus Rate(s)
Pre-IRA: N/A

Post-IRA: $5.50 per MWh wind, closed-loop biomass, geothermal, and solar. $3.00 per MWh for open-loop biomass, landfill gas, trash, qualified hydropower, and marine and hydrokinetic renewable energy
Pre-IRA: $28.00 per MWh for wind, closed-loop biomass, and geothermal. $14.00 per MWh for open-loop biomass, landfill gas, trash, qualified hydropower, and marine and hydrokinetic renewable energy

Post-IRA: $27.50 per MWh for wind, closed-loop biomass, geothermal, and solar. $15.00 per MWh for open-loop biomass, landfill gas, trash, qualified hydropower, and marine and hydrokinetic renewable energy

Energy Community: 10%

Domestic Content: 10%

Low-Income: N/A

The §45 PTC has two different rate regimes depending on when a project was placed in service:

  • Pre-IRA (pre-2022): For projects placed in service before 2022, the full PTC calculation is [1.5 cents] x [inflation adjustment factor] rounded to the nearest 0.1 cents. Current rate is $28.00 per MWh. Projects placed in service before 2022 are not subject to prevailing wage and apprenticeship requirements.
  • Post-IRA (post-2021): For projects placed in service after 2021, the full PTC rate calculation is [0.3 cents] x [inflation adjustment factor] rounded to the nearest 0.05 cents. For projects meeting PWA requirements, this product is multiplied by five. The current wind rate, for example, assuming prevailing wage and apprenticeship compliance, is $27.50 per MWh.

§45Y PTC – Clean electricity production credit

Funding mechanism: Production tax credit

Technology grouping: Electricity

Eligibility: Technology-neutral tax credit for production of clean electricity. The §45Y PTC is for facilities generating electricity for which the greenhouse gas emissions rate is not greater than zero

U.S. Code: 26 U.S. Code §45Y

Duration: 10 years

Period of availability: Projects placed in service beginning in 2025 are eligible for the credit. The credit is subject to a four-year phase-out (100%, 75%, 50%, 0%) for projects that begin construction in the first calendar year after the ”applicable year,” which is the later of (1) 2032 or (2) the calendar year in which the IRS determines that the annual greenhouse gas emissions from the production of electricity in the U.S. are equal to or less than 25% of the annual greenhouse gas emissions from the production of electricity in the U.S. in 2022.

Below is an example phase-out schedule, assuming the "applicable year" is 2032. An eligible project that begins construction in 2035 and meets PWA requirements will generate §45Y PTCs worth $13.75 per MWh when it is placed in service

Inflation adjustment: Subject to annual inflation adjustment factor

Stackability and limitations:

  • Cannot be stacked with §48E or §45Q

Elective pay (direct pay): Tax-exempt entities

Rates:

Base Rate Full Rate Bonus Rate(s)
$5.50 per MWh (plus inflation from 2023 rate) $27.50 per MWh (plus inflation from 2023 rate) Energy Community: 10%

Domestic Content: 10%

Low-Income: N/A

§48 ITC – Energy credit

Funding mechanism: Investment tax credit

Technology grouping: Electricity

Eligibility: Fuel cell, solar, geothermal, small wind, energy storage, biogas, microgrid controllers, and combined heat and power properties

U.S. Code: 26 U.S. Code §48

Duration: 1 year

Period of availability: Projects must begin construction in 2023 or 2024. For projects placed in service in 2025 or later, the §48E ITC will replace the §48 ITC

Inflation adjustment: Not applicable

Stackability and limitations:

  • Low-income bonus is limited to projects less than 5 MW

Elective pay (direct pay): Tax-exempt entities

Rates:

Base Rate Full Rate Bonus Rate(s)
6% 30% Energy Community: 10%

Domestic Content: 10%

Low-Income: 10% if located in low-income community or on Indian land. 20% if part of qualified low-income residential building project or qualified low-income economic benefit project

§48E ITC – Clean electricity investment credit

Funding mechanism: Investment tax credit

Technology grouping: Electricity

Eligibility: Technology-neutral tax credit for investment in facilities generating electricity for which the greenhouse gas emissions rate is not greater than zero

U.S. Code: 26 U.S. Code §48E

Duration: 1 year

Period of availability: Projects placed in service beginning in 2025 are eligible for the credit. The credit is subject to a four-year phase-out (100%, 75%, 50%, 0%) for projects that begin construction in the first calendar year after the ”applicable year,” which is the later of (1) 2032 or (2) the calendar year in which the IRS determines that the annual greenhouse gas emissions from the production of electricity in the U.S. are equal to or less than 25% of the annual greenhouse gas emissions from the production of electricity in the U.S. in 2022.

Below is an example phase-out schedule, assuming the "applicable year" is 2032. An eligible project that begins construction in 2034 and meets PWA requirements will generate a §48E ITC worth 22.5% of the project’s qualified investment when it is placed in service

Inflation adjustment: Not applicable

Stackability and limitations:

  • Low-income bonus is limited to projects less than 5 MW
  • Cannot be stacked with §45Y, §48C, or §45Q

Elective pay (direct pay): Tax-exempt entities

Rates:

Base Rate Full Rate Bonus Rate(s)
6% 30% Energy Community: 10%

Domestic Content: 10%

Low-Income: 10% if located in low-income community or on Indian land. 20% if part of qualified low-income residential building project or qualified low-income economic benefit project

§30C ITC – Alternative fuel vehicle refueling property credit

Funding mechanism: Investment tax credit

Technology grouping: Vehicles

Eligibility: For clean-burning fuels, as defined in the statute. Alternative fuels include electricity (recharging property), ethanol, natural gas, liquified petroleum gas, hydrogen, and biodiesel

U.S. Code: 26 U.S. Code §30C

Duration: 1 year

Period of availability: Project must be placed in service between 1/1/2023 and 12/31/2032

Inflation adjustment: Not applicable

Stackability and limitations:

  • The project must be located in a low-income or rural area
  • The credit is capped at $100,000 per property

Elective pay (direct pay): Tax-exempt entities

Rates

Base Rate Full Rate Bonus Rate(s)
6% 30% N/A

§45U PTC – Zero-emission nuclear power production credit

Funding mechanism: Production tax credit

Technology grouping: Electricity

Eligibility: The §45U PTC is for electricity from qualified nuclear power facilities

U.S. Code: 26 U.S. Code §45U

Duration: 9 years

Period of availability: Available for electricity produced and sold after 12/31/2023, in tax years beginning after that date. Not available for tax years beginning after 12/31/2032

Stackability and limitations:

  • Cannot claim §45J credit
  • Credit amount phases down depending on the amount of energy produced and the gross receipts of the facility
  • Payments from federal, state, or local zero-emission nuclear subsidies reduce the credit amount

Inflation adjustment: Subject to annual inflation adjustment factor

Elective pay (direct pay): Tax-exempt entities

Rates

Base Rate Full Rate Bonus Rate(s)
$3.00 per MWh $15.00 per MWh N/A

§45Q PTC – Credit for carbon oxide sequestration

Funding mechanism: Production tax credit

Technology grouping: Electricity

Eligibility: The §45Q PTC is for carbon dioxide sequestration coupled with permitted end uses within the U.S.

U.S. Code: 26 U.S. Code §45Q

Duration: 12 years

Period of availability: Facilities must be placed in service prior to 2033

Stackability and limitations: 

  • The credit is limited to U.S. facilities within minimum volumes: (1) 1,000 metric tons of CO2 per year for direct air capture (DAC) facilities; (2) 18,750 metric tons for electricity-generating facilities with carbon capture capacity of 75% of baseline CO2 production; (3) 12,500 metric tons for any other facility
  • Cannot be stacked with §45V, §45Z, §48C, or §48E

Inflation adjustment: Subject to annual inflation adjustment factor

Elective pay (direct pay): Tax-exempt entities. Taxable entities for up to five years

Rates:

Base Rate Full Rate Bonus Rate(s)
$17/metric ton of carbon dioxide captured and sequestered. For DAC facilities, the value is $36.

$12/metric ton for carbon dioxide that is injected for enhanced oil recovery or utilized. For DAC facilities, the value is $26.
$85/metric ton of carbon dioxide captured and sequestered. For DAC facilities, the value is $180.

$60/metric ton for carbon dioxide that is injected for enhanced oil recovery or utilized. For DAC facilities, the value is $130.
N/A

§45Z PTC – Clean fuel production tax credit

Funding mechanism: Production tax credit

Technology grouping: Fuels

Eligibility: The §45Z PTC is for the domestic production of clean transportation fuels, including sustainable aviation fuels. Fuels with less than 50 kilograms of carbon dioxide equivalent per one million British thermal units (CO2e per mmBTU) qualify as clean fuels eligible for credits

U.S. Code: 26 U.S. Code §45Z

Duration: 3 years

Period of availability: Available for fuels produced after 2024 and used or sold before 2028

Stackability and limitations: 

  • Producers must be registered as a producer of clean fuel under 26 U.S. Code §4101
  • Fuels must be produced in the U.S.
  • Fuels must be sold to an unrelated this person
  • To be considered "clean," fuels must emit no more than 50 kilograms of carbon dioxide equivalent per one million British thermal units (CO2e per mmBTU)
  • "Transportation fuels" must be deemed "suitable for use as a fuel in a highway vehicle or aircraft"
  • Cannot be stacked with §45V or §45Q

Inflation adjustment: Subject to an annual inflation adjustment factor after 2024

Elective pay (direct pay): Tax-exempt entities

Rates:

Base Rate Full Rate Bonus Rate(s)
$0.20/gallon for non-aviation fuel and $0.35/gallon for aviation fuel, multiplied by the emissions factor of the fuel. $1.00/gallon for non-aviation fuel and $1.75/gallon for aviation fuel, multiplied by the emissions factor of the fuel. N/A

The Congressional Research Service (CRS) has estimated clean fuel values by emission factor.

§45V PTC – Clean hydrogen production tax credit

Funding mechanism: Production tax credit

Technology grouping: Fuels

Eligibility: The §45V PTC is for the production of clean hydrogen at a qualified clean hydrogen facility

U.S. Code: 26 U.S. Code §45V

Duration: 10 years

Period of availability: Credit is for hydrogen produced after 12/31/22. Credit is available for facilities placed in service before 1/1/33

Stackability and limitations:

  • Producers must be in the U.S.
  • The project developer can make a non-irrevocable election for an ITC (instead of the §45V PTC) as long as the project has not claimed the §45Q PTC for carbon sequestration
  • Cannot be stacked with §45Q, §45Z, or §48C

Inflation adjustment: Subject to an annual inflation adjustment factor

Elective pay (direct pay): Tax-exempt entities. Taxable entities for up to five years

Rates:

Base Rate Full Rate Bonus Rate(s)
$0.60/kg multiplied by the applicable percentage. The applicable percentage ranges from 20% to 100% depending on lifecycle greenhouse gas emissions. $3.00/kg multiplied by the applicable percentage. The applicable percentage ranges from 20% to 100% depending on lifecycle greenhouse gas emissions. N/A

§48C ITC – Advanced energy project credit

Funding mechanism: Investment tax credit

Technology grouping: Manufacturing

Eligibility: For investments in advanced energy projects, as defined in §48C(c)(1) – a project that (1) re-equips, expands, or establishes an industrial or manufacturing facility for the production or recycling of a range of clean energy equipment and vehicles; (2) re-equips an industrial or manufacturing facility with equipment designed to reduce greenhouse gas emissions by at least 20 percent; or (3) re-equips, expands, or establishes an industrial facility for the processing, refining, or recycling of critical materials

U.S. Code: 26 U.S. Code §48C

Duration: 1 year

Period of availability: §48C is an allocated credit. It is available when the application and certification process begins and ends when the credit is fully allocated. Projects must be placed in service within two years of application approval and certification

Stackability and limitations:

  • Allocated credit subject to $10 billion cap. At least $4 billion must be allocated to energy communities
  • Cannot be stacked with §45X, §48, §48E, §45Q, or §45V

Inflation adjustment: Not applicable

Elective pay (direct pay): Tax-exempt entities

Rates:

Base Rate Full Rate Bonus Rate(s)
6% 30% N/A

§45X PTC – Advanced manufacturing production tax credit

Funding mechanism: Production tax credit

Technology grouping: Manufacturing

Eligibility: The §45X PTC is for domestic manufacturing of components for solar and wind energy, inverters, battery components, and critical minerals

U.S. Code: 26 U.S. Code §45X

Duration: 10 years

Period of availability: Credit for critical materials is permanent starting in 2023. For other components, credit is subject to a phase-out beginning in 2030 (75%, 50%, 25%, 0%)

Stackability and limitations:

  • Producers must be in the U.S.
  • Property must be sold to an unrelated party
  • Cannot claim §45X credit for property produced at facilities that received the §48C credit
  • Credit is subject to a phase-out beginning in 2030 (75%, 50%, 25%, 0%), except for critical minerals

Inflation adjustment: Although §45X is a PTC, the credit is not inflation-adjusted

Elective pay (direct pay): Tax-exempt entities. Taxable entities for up to five years

Rates: Rates for the §45X PTC are component-specific

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