🌎 Carbon Capture Credit Safe Harbor (Section 45Q): What Taxpayers Need to Know

 🌎 Carbon Capture Credit Safe Harbor (Section 45Q)

What Businesses Need to Know About the 2025 Safe Harbor

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If your business captures and stores carbon dioxide, there's a new piece of IRS guidance you may need to know about.

On December 19, 2025, the IRS and Treasury released Notice 2026-01, providing a temporary safe harbor for taxpayers claiming the Section 45Q Carbon Oxide Sequestration Credit for qualified carbon oxide captured and placed into secure geological storage during calendar year 2025.

The safe harbor addresses a very specific problem: changes to the Environmental Protection Agency's greenhouse-gas reporting requirements could have left taxpayers without the normal reporting mechanism needed to substantiate their carbon-storage claims.

Here's the plain-English version of what the safe harbor does and who may need it.

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⭐ What Is the Section 45Q Carbon Capture Credit?

Section 45Q provides a federal tax credit for certain qualified carbon oxide that is captured and either:

• Permanently disposed of in secure geological storage, or
• Used in certain qualifying ways under the tax rules

The credit has specific requirements involving the type of carbon oxide, the equipment used to capture it, how the carbon is stored or used, and the documentation supporting the claim.

This isn't a general clean-energy credit for every business. Section 45Q applies to specific carbon-capture and sequestration activities that meet the requirements of the tax law.

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⭐ Why Was a Safe Harbor Needed?

Under the existing rules, certain taxpayers claiming the Section 45Q credit for geological storage rely on the EPA's Greenhouse Gas Reporting Program, known as Subpart RR, to document and verify carbon sequestration.

The EPA had proposed removing reporting obligations related to geological sequestration under Subpart RR.

That created a practical problem: if the normal electronic reporting system wasn't available for 2025, taxpayers could potentially have difficulty meeting the IRS requirements for documenting their carbon storage.

The IRS and Treasury created the safe harbor to provide an alternative method for 2025.

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🧪 What Does the Safe Harbor Allow?

The safe harbor applies when the EPA does not launch its electronic Greenhouse Gas Reporting Tool (e-GGRT) for reporting year 2025 by June 10, 2026.

If that happens, qualifying taxpayers can use an alternative certification process.

Instead of submitting the required 2025 annual report through e-GGRT, the taxpayer can:

• Prepare the required annual report
• Follow the applicable Subpart RR requirements that were in effect on December 31, 2025
• Submit the annual report to a qualified independent engineer or geologist
• Have that professional certify the report in accordance with the IRS requirements

That certification can satisfy the applicable Subpart RR and certification requirements for purposes of the 2025 Section 45Q credit.

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🛢️ Who Can Use the 2025 Safe Harbor?

The safe harbor is specifically aimed at taxpayers with qualified carbon oxide captured and disposed of in secure geological storage during calendar year 2025.

It also covers certain carbon oxide described in the Section 45Q regulations that meets the applicable requirements.

The safe harbor does not apply to carbon oxide that is used as a tertiary injectant in a qualifying enhanced oil or natural gas recovery project when the applicable rules exclude it from the safe harbor.

Because Section 45Q has detailed eligibility requirements, businesses should not assume that simply capturing or storing carbon automatically qualifies them for the credit.

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📋 What Does a Business Need to Do?

If you're relying on the safe harbor, documentation is extremely important.

1. Continue following the applicable monitoring requirements

The safe harbor doesn't mean you can stop keeping records.

The taxpayer must comply with the applicable Subpart RR requirements as they were in effect on December 31, 2025.

2. Prepare the required annual report

The taxpayer must prepare an annual report containing the information required under the applicable Subpart RR rules.

That means maintaining the necessary measurements, calculations, monitoring information, and supporting documentation.

3. Obtain independent certification

The annual report must be submitted to an independent engineer or geologist who meets the requirements in Notice 2026-01.

The certification must include an affidavit establishing the professional's independence from the taxpayer and must be made under penalties of perjury.

4. Complete the documentation on time

The required documentation and certification must be completed by the time the taxpayer timely files the applicable federal tax return, including extensions.

That means this isn't something you want to leave until after the return has already been filed.

5. File Form 8933

The safe harbor doesn't replace the requirement to report the Section 45Q credit.

Taxpayers claiming the credit generally use Form 8933, Carbon Oxide Sequestration Credit.

The IRS instructions confirm that Form 8933 is used to claim the Section 45Q credit.

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🧾 What Records Should You Keep?

For a credit this specialized, documentation is everything.

Businesses should maintain records supporting:

• The amount of qualified carbon oxide captured
• How and where the carbon oxide was disposed of
• Monitoring and measurement information
• Required annual reports
• Supporting calculations
• Independent engineer or geologist certification
• Any required affidavits
• Form 8933 and supporting tax-return documentation

The IRS specifically states that taxpayers relying on the safe harbor should retain the required documentation and certification in their books and records.

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🗓️ How Long Does the Safe Harbor Last?

This is an important point:

The 2025 safe harbor applies to qualified carbon oxide captured and placed into secure geological storage during calendar year 2025.

It is not a permanent replacement for the EPA reporting system.

Treasury and the IRS have stated that they intend to issue additional regulations addressing Section 45Q, including measurement and verification standards, for future years.

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💡 What About 2026?

This is where businesses need to be careful.

The safe harbor we're discussing here is specifically for 2025 activity.

It should not be assumed that the same alternative certification procedure automatically applies to carbon-storage activity occurring in 2026 or later.

Future Section 45Q requirements should be checked against the latest IRS and Treasury guidance.

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🌸Alicia’s Insight 🌸

This is one of those tax topics where "I have the paperwork somewhere" isn't quite good enough. 😉

Section 45Q is a highly specialized credit, and the documentation requirements are just as important as the credit itself.

If your business is involved in carbon capture or geological sequestration, don't wait until tax-return time to figure out whether your records support the credit.

Keep the monitoring information, reports, certifications, and supporting documentation organized throughout the year.

And because this is an area where IRS and EPA requirements can interact, it's especially important to coordinate with the professionals responsible for your tax return, environmental compliance, and engineering or geological certification.

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📌 Printable

 🌎 Section 45Q Carbon Capture Credit — Documentation Checklist

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📌 Bottom Line

The Section 45Q safe harbor gives qualifying taxpayers a temporary alternative for satisfying certain reporting and certification requirements for calendar-year 2025 secure geological storage if the EPA's 2025 e-GGRT reporting system was not launched by June 10, 2026.

For businesses that qualify, the safe harbor can help prevent a reporting-system transition from disrupting their ability to substantiate the Section 45Q credit.

But this is a highly specialized tax credit, and the documentation requirements matter.

If your business is claiming or considering claiming Section 45Q, make sure your tax professional and the appropriate environmental, engineering, or geological professionals are working from the same set of records and the current IRS guidance.

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This article is for educational purposes only and should not be considered legal or tax advice. Tax laws change over time, and every taxpayer's situation is unique. If you have questions about your specific circumstances, consult a qualified tax professional.