Form 8933 Schedule C – Carbon Oxide Sequestration Credit Guide

Q: Can the Section 45Q credit be transferred to a third party?

The Section 45Q credit may be transferred under IRC Section 6418, but Schedule C (Form 8933) does not capture transferee information or Section 6418 election details. None of Schedule C's 21 numbered lines reference Section 6418. Schedule C is scoped to EOR operator certification - owners, operator, project, secure storage, and CO2 suppliers. The transfer election lives on the parent return.

Q: What is the direct pay election for the 45Q credit?

Eligible entities may elect direct pay under IRC Section 6417, but Schedule C (Form 8933) does not document the Section 6417 election. None of Schedule C's 21 lines reference Section 6417, transferee data, or entity-type qualification. Schedule C is the Enhanced Oil Recovery Operator Certification.

Editorial Standards

How we research, review, and update this guide

Every Accountably guide is researched against primary IRS sources, reviewed by a U.S. CPA, and refreshed as guidance evolves. Read our Editorial Guidelines to see how we source, fact-check, and update our content.

People assume Schedule C is the EOR equivalent of any other §45Q attachment, then get tripped up by where it actually attaches. It is required only when the parent Form 8933, Part I, line 31, is marked Yes, meaning the qualified carbon oxide went into an enhanced oil recovery or enhanced natural gas recovery project as a tertiary injectant. If that line is not Yes, you are on the wrong schedule.

The schedule's 21 numbered lines cover the EOR project owners with their operating interest percentage on line 1, the operator under §1.45Q-2(h) on line 3, well permitting on line 10, and the secure-storage pathway on line 15. For tax year 2025 the inflation-adjusted §45Q(b)(3) rate on Part III, line 2g, is $14.21 per metric ton, and lock down the credit allocation agreement and verification report before you open the schedule, because missing either kills the credit on exam.

Key Takeaways

Schedule C (Form 8933) is the Enhanced Oil Recovery Operator Certification – Parts I-III cover EOR project owners (Part I), the §1.45Q-2(h) operator and project information (Part II), and the qualified carbon oxide supplied and securely stored (Part III). Not to be confused with Schedule C (Form 1040), the sole-proprietor Profit or Loss From Business schedule.
Schedule C (Form 8933) is required only when parent Form 8933 Part I Line 31 is Yes – that is, the EOR or enhanced natural gas recovery pathway. §6417 direct pay and §6418 transfer elections are reported on the parent return, not on Schedule C.
The schedule's 21 lines cover EOR project owners with operating interest percentage (Line 1), the §1.45Q-2(h) operator (Line 3), well permitting (Line 10), the secure-storage pathway (Subpart RR or ISO 27916 on Line 15, or EPA Class VI on Lines 13-14), CO2 suppliers (Line 19), and metric tons delivered/stored with EPA attestation on Lines 20-21.
Schedule C is filed with the taxpayer’s annual return – the election to transfer or elect direct pay must be made on a timely filed (including extensions) original return.
Quick SOP rule: lock down the credit allocation agreement and verification report before you open Schedule C – missing either kills the credit on exam.
Common pitfall: using the wrong credit rate for the capture category. The Inflation Reduction Act restructured the rate schedule significantly; older-era tables no longer apply to facilities that began construction after 2022.

What Form 8933 Schedule C Is

Form 8933 is the IRS's multi-schedule return for the §45Q carbon oxide sequestration credit. Schedule C is the Enhanced Oil Recovery Operator Certification attached to Form 8933 when the parent form's Part I Line 31 is Yes. Schedule D (Form 8933) is used for recapture reporting on Form 4255, not facility-specific metrics.

Schedule C's job is to certify the EOR project: identify every owner with operating interest percentage (Part I), document the §1.45Q-2(h) operator, project location, well permitting, and secure-storage pathway (Part II), and report each CO2 supplier with metric tons delivered and stored against EPA filings or ISO 27916 documentation (Part III). It is the operator-certification layer for the EOR injection pathway, not an elections layer.

The current revision is Schedule C (Form 8933) (Rev. December 2025), OMB No. 1545-0123, Cat. No. 94874C. It contains three Parts and 21 numbered lines (Line 11 is reserved for future use). §6418 transfer and §6417 direct pay elections are reported on the parent Form 8933 return, not on Schedule C.

The Section 45Q Credit Framework

Before touching the form, every preparer needs a working understanding of what the 45Q credit actually rewards. The credit goes to taxpayers who own carbon capture equipment at a qualified facility and who capture carbon oxide and either sequester it in geological formations or use it in a qualified enhanced oil and gas recovery project.

The credit is calculated per metric ton of CO2 equivalent captured and either stored or utilized. IRC Section 45Q has been around since 2008 but went through major revision in the Bipartisan Budget Act of 2018 and again under the Inflation Reduction Act of 2022. Each wave of legislation changed the credit rates, the construction commencement rules, and the election mechanisms.

Credit Categories Under Current Law

Capture Category	Disposition Method	Rate With PWA Multiplier (5.0 × base)
Carbon oxide from industrial source	Geological sequestration	$85 per metric ton
Carbon oxide from industrial source	EOR / other use	$60 per metric ton
Direct air capture (DAC)	Geological sequestration	$180 per metric ton
Direct air capture (DAC)	EOR / other use	$130 per metric ton

The statutory base rates are the default ($17 / $12 industrial; $36 / $26 direct air capture per parent Form 8933 Part III). Meeting the prevailing wage and apprenticeship requirement on Part I Line 33 multiplies the base rate by 5.0 to reach the bonus rates shown above. From my side of the desk, this distinction deserves its own line in your engagement checklist – the difference between the full rate and the reduced rate can change the credit value by hundreds of thousands of dollars on a large-scale facility.

Who Must File Schedule C

Schedule C (Form 8933) is required only when the parent Form 8933 Part I Line 31 is Yes – that is, when the facility captures qualified carbon oxide, uses it as a tertiary injectant in a qualified enhanced oil or natural gas recovery project, and disposes of it in secure geological storage. The schedule is referenced at parent Form 8933 Part III Line 2i (increased credit amount for the EOR/injection pathway).

Every EOR project owner during the tax year is reported on Line 1 with operating interest percentage; Rows A-D are preprinted but every owner must be listed (attach a continuation statement for more than four).
Enhanced natural gas recovery projects file Schedule C as well – mark Line 9 Yes for gas-recovery projects.
Geological-sequestration-only and utilization-only claimants do not file Schedule C; Schedule C is scoped to the EOR/injection pathway.

§6417 direct pay and §6418 transfer elections are not made on Schedule C. Those elections live on the parent Form 8933 return.

Credit Rates and Qualified Facilities

A “qualified facility” under Section 45Q must meet three conditions: the carbon capture equipment must be placed in service after February 9, 2018; the facility must capture a minimum annual amount of CO2 (ranging from 12,500 metric tons per year for certain industries to 1,000 metric tons per year for direct air capture); and construction must have begun before January 1, 2033, for the IRA-era rates to apply.

Facilities that began construction before January 1, 2018, use the pre-BBA 2018 credit rules, which are much less favorable. When I see an older capture project, I always verify the construction commencement date before applying any credit rate table. Confusion here is common because the facility may have been operational for years while the IRA-era rates were assumed by the client.

Prevailing Wage and Apprenticeship Requirements

For facilities that began construction after January 29, 2023, the IRS issued guidance requiring taxpayers to satisfy prevailing wage and apprenticeship (PWA) standards to claim the full credit rates. The requirements apply to the construction, alteration, and repair of the facility and its capture equipment. The statutory base rate applies when PWA standards are not met; meeting PWA multiplies the base by 5.0 to reach the full bonus rate (parent Form 8933 lines 1i, 2i, and 3k).

There is a correction mechanism: taxpayers who miss the requirements can cure the deficiency by paying back wages plus interest and a 10% penalty. That cure is available but expensive – it’s far better to build the recordkeeping into the project from day one.

Direct Pay Election – Section 6417

One of the most significant post-IRA developments for 45Q is the ability for certain entities to elect “direct pay” under Section 6417. Instead of using the credit to offset tax liability, eligible electing taxpayers receive a cash payment equal to the credit amount. This makes the credit genuinely usable for entities with low or no tax liability.

Eligible Entities for Direct Pay

Tax-exempt organizations described in IRC Section 501(c)
State or local governments and their agencies
Indian tribal governments
Alaska native corporations
The Tennessee Valley Authority
Rural electric cooperatives
For the first five years of the credit period, any taxpayer may elect direct pay for the 45Q credit (this “transitional” direct-pay right has its own sunset rule)

The §6417 direct pay election is not made on Schedule C – none of Schedule C's 21 lines reference §6417. The election mechanics live on the parent return and other §6417 filings. I still flag this in engagement letters because clients sometimes assume the direct pay amount is taxable revenue – it is treated as a tax refund and is not income to the recipient.

Credit Transfer – Section 6418

Section 6418 allows taxpayers to transfer all or a portion of an eligible credit – including the 45Q credit – to an unrelated transferee. The transferee pays cash for the credit, and that payment is not includable in the seller’s income and not deductible by the buyer. The credit retains its character in the transferee’s hands.

The §6418 transfer election is made on the transferor's parent Form 8933 return for the year the credit is generated. Schedule C (Form 8933) does not capture transferee EIN, transfer amount, or consideration – none of its 21 numbered lines reference §6418. The transferee does not attach Schedule C to report received credits; Schedule C is scoped to EOR operator certification only.

Transfer Mechanics That Matter in Practice

A few nuances that create errors in practice. The election is made per credit, per year – there is no multi-year lock-in. The transferor cannot transfer more than the credit amount determined on Form 8933, net of any direct pay election. And if the IRS later recaptures the credit (because CO2 leaks from geological storage within ten years), the recapture liability falls on the transferee, not the transferor.

Quick rule you can copy into your SOP: always include an indemnification clause in the credit purchase agreement covering recapture risk. That’s a legal document issue, but your tax engagement letter should note that it was addressed.

How to Complete Schedule C

Schedule C is organized into several parts. Here is how I walk through each section:

Part I – Information About the Owner(s) of the EOR Project

Line 1 collects information about each owner of the EOR project during the tax year across four columns: (i) EOR project owner name, (ii) address, (iii) employer identification number (EIN), and (iv) operating interest percentage. Rows A-D are preprinted; if there are more than four owners, attach a continuation statement preserving columns (i)-(iv). The instruction is exhaustive – list every owner, not just the top four.

Part II – Information About the EOR Project

Lines 2-18 cover the project itself: name and county/state location (Line 2), the §1.45Q-2(h) operator (Line 3), other-purpose operators (Line 4), IRS-issued registration numbers (Line 5a), EPA e-GGRT IDs (Line 5b), MM/YYYY injection-start date (Line 6), §43 certification date (Line 7) or attached petroleum engineer's certification (Line 8), enhanced natural gas recovery flag (Line 9), well-permit attestation (Line 10 – No disqualifies the credit), Class VI well flag (Line 12) with Class VI attestation (Line 13) and EPA MRV approval date (Line 14), or for non-Class VI projects the Subpart RR / ISO 27916 election on Line 15 with supporting attachments on Lines 16-18.

Part III – Information About the Qualified Carbon Oxide Supplied to the EOR Project and Securely Stored

Line 19 lists every qualified carbon oxide supplier across six columns: supplier name, EIN, capture facility name, capture facility location (county and state), qualified-CO2 flag, and nonqualified-CO2 flag. Rows A-C are preprinted; if there are more than three suppliers, attach a continuation statement – the instruction is exhaustive. Line 20 reports metric tons delivered and metric tons stored per owner per supplier across 13 data columns (b-m, including totals). Line 21 is the checkbox attesting that all Line 20 data conforms to applicable EPA filings and certified ISO 27916 documentation.

Attestation Gates Across Schedule C

Schedule C has only three Parts; there is no Part IV. The credit-denial gates and attestations are embedded inside Parts I-III: Line 10 – if any injection well is not appropriately permitted, the credit cannot be claimed; Line 13 – when Class VI wells are present, attest that all stored qualified carbon oxide figures match figures reported under the EPA MRV plan and Subpart RR; and Line 21 – attest that all Line 20 metric-ton data conforms to applicable EPA filings and certified ISO 27916 documentation.

Deadlines and Extension Rules

Taxpayer Type	Original Due Date	Extended Due Date
C Corporations (calendar year)	April 15	October 15 (6 months)
Partnerships and S Corps (calendar year)	March 15	September 15 (6 months)
Individuals (Schedule C or K-1 recipients)	April 15	October 15 (6 months)
Tax-exempt organizations (Form 990-T)	15th day of 5th month after year-end	15th day of 11th month after year-end

The transfer and direct-pay elections must be made on the original return or a return filed before the extended due date – but only if the extension was filed before the original due date. A return that is delinquent beyond the original due date cannot carry a valid transfer election. That is a hard deadline with real money at stake.

Recordkeeping Requirements

The 45Q credit is one of the most documentation-intensive energy credits in the code. The IRS expects:

Annual verification report – prepared by a qualified independent engineer or geologist confirming that the captured CO2 was disposed of in a manner consistent with applicable requirements
Metering and measurement data – continuous monitoring records showing metric tons of CO2 captured, transported, and disposed of for each qualified facility
Co-ownership agreement – signed document establishing each co-owner’s percentage allocation of the credit
Transfer agreement – if a credit transfer was executed, the purchase agreement documenting the consideration paid and the credit amount transferred
Prevailing wage records – payroll records supporting compliance with PWA requirements for construction and repair activities
Recapture monitoring plan – for geological sequestration projects, the EPA-approved monitoring plan and any subsequent annual reports (Schedule C Line 15 requires filers without EPA Class VI wells to elect either Subpart RR or ISO 27916 to demonstrate secure storage – the two pathways are mutually exclusive, not stackable)

Keep these records for the full recapture window – ten years from the date of sequestration. In practice, that means the records extend well beyond the three-year audit statute of limitations on the return.

Common Mistakes That Slow Things Down

Schedule C rarely fails in obvious ways. The recurring pattern we see is small line-level errors that surface during IRS exam years after the credit was claimed. Catch them at preparation, not at audit.

1. Confusing Schedule C (Form 8933) with Schedule C (Form 1040). The names match but the schedules are unrelated. Schedule C (Form 8933) is the Enhanced Oil Recovery Operator Certification for the §45Q credit; Schedule C (Form 1040) is the sole-proprietor Profit or Loss From Business schedule. Misrouting the file inside the engagement workpapers is a small error with outsized review cost. Fix: Standardize the file name as "Schedule C (Form 8933) – EOR Operator Certification" in the engagement folder and on every internal review note so reviewers cannot misroute it.

2. Reporting the EPA-permit or state operator on Line 3. Line 3 must show the person who is the operator for purposes of Treasury Regulations §1.45Q-2(h). That operator can differ from the EPA-permit holder or the state-designated operator, and the form provides Line 4 for the other-purpose operators with the nature of each purpose noted. Fix: Map every regulatory operator role on a single workpaper before drafting, identify the §1.45Q-2(h) operator with statutory support, and disclose the rest on Line 4.

3. Marking both ISO 27916 and Subpart RR on Line 15. Line 15 is a single-pathway election when the project has no EPA Class VI wells (Line 12 = No). Selecting both does not strengthen the secure-storage claim; it creates inconsistency between Line 16 (Subpart RR) and Lines 17 to 18 (ISO 27916), which an examiner will flag. Fix: Document the secure-storage decision before the return is drafted, attach only the documentation tied to the elected pathway, and use Lines 13 and 14 (not Line 15) when EPA Class VI wells are involved.

4. Using the wrong credit-rate row for EOR injection. Schedule C feeds the EOR pathway on parent Form 8933 Part III Line 2g, not the secure-storage-only Line 1g. For 2025 the §45Q(b)(3) elected rate on Line 2g is $14.21, the pre-2023 placed-in-service rate is $32.54, the post-2022 statutory rate is $12, and the Direct Air Capture rate is $26, per IRS Form 8933 instructions. Fix: Tie the rate selection to the equipment's placed-in-service date and the parent Form 8933 Line 28 election in a single rate-decision memo before pricing the credit.

5. Skipping the petroleum engineer's certification. If the project was not previously certified under §43, a current petroleum engineer's certification must be attached. EPA-permit documentation is not a substitute. Line 7 captures the §43 certification date when one exists; Line 8 covers the new attachment when one does not. Fix: Add a pre-file checklist item that verifies either a valid §43 certification (with the date for Line 7) or a current petroleum engineer's certification (attached for Line 8) before the return is signed.

6. Reporting only the top three suppliers on Line 19. Schedule C provides three preprinted supplier rows (A, B, C), but the disclosure is exhaustive, not top-three. The same logic applies on Line 1, which preprints four owner rows (A through D) yet expects every owner to be listed with operating interest percentage. Fix: Attach a continuation statement that preserves the column structure of Line 19 (supplier, EIN, capture facility name and location, qualified and nonqualified flags) for any supplier beyond Row C, and do the same for Line 1 owners beyond Row D.

Practical Checklists You Can Reuse

These three checklists are copy-paste ready for firm SOPs. Run them before any §45Q engagement signs off; each one targets a single failure mode we see during IRS exam, citing line numbers straight from the Schedule C (Form 8933) instructions.

Pre-file Schedule C (Form 8933) review

Confirm parent Form 8933 Part I Line 31 is Yes; that is the trigger for Schedule C.
List every EOR project owner on Line 1 with operating interest percentage; attach a continuation statement if there are more than four.
Identify the §1.45Q-2(h) operator on Line 3 and disclose other-purpose operators on Line 4 with the nature of each purpose.
Capture the MM/YYYY injection-start date on Line 6 (no day component).
Record the §43 certification date on Line 7, or attach the petroleum engineer's certification at Line 8.
Confirm Line 9 (enhanced natural gas recovery flag) reflects the actual project type.
Verify Line 10 is Yes (all injection wells appropriately permitted); a No answer disqualifies the credit.
Reconcile Line 20 metric-tons-delivered and metric-tons-stored to EPA Subpart RR filings or certified ISO 27916 reports before signing the Line 21 attestation.

Secure-storage pathway documentation

Determine whether any well in the project is an EPA Class VI well; a Yes on Line 12 routes to the Class VI path and skips Line 15.
Class VI path: check the Line 13 attestation that all stored figures match figures reported under the EPA MRV plan and Subpart RR.
Class VI path: enter the MM/DD/YYYY EPA MRV plan approval date on Line 14 and attach the approved MRV plan or its EPA URL.
Non-Class-VI path: select exactly one option on Line 15 (Subpart RR or ISO 27916).
Subpart RR pathway: provide the MM/DD/YYYY EPA MRV approval date on Line 16 and attach the plan or URL.
ISO 27916 pathway: attach both the ISO 27916 documentation for the year (Line 17) and the qualified independent engineer or geologist certification (Line 18).
Store the secure-storage memo in the engagement folder alongside Schedule C so reviewers do not chase the source documents.

§45Q rate selection memo

Record the carbon capture equipment's placed-in-service date relative to the February 9, 2018 statutory cutoff and the July 5, 2025 transition date.
Document whether the parent Form 8933 Line 28 §45Q(b)(3) election is being made for 2025.
Identify the applicable 2025 Line 2g rate: $32.54 (pre-2023, no election), $14.21 (§45Q(b)(3) election), $12 (post-2022 statutory), or $26 (Direct Air Capture).
Confirm whether the prevailing wage and apprenticeship requirement is met on Part I Line 33; the 5.0 multiplier applies to Line 2i, Line 1i, and Line 3k, not to Schedule C entries.
Reduce the credit for tax-exempt bond financing at the lesser of the bond-financing fraction or 15%, if applicable, on Part III Line 5c.
Tie the §45Q credit through to Form 3800, Part III, line 1x, and queue Form 4255 (with Schedule D (Form 8933) detail) if a recapture event has occurred.

Keep 8933-SC Season From Stalling

Schedule C engagements do not collapse into a single filing week the way 1040 season does. The §45Q credit calculation depends on annual EPA Subpart RR filings, certified ISO 27916 documentation, supplier-level metric-ton reconciliations, petroleum engineer certifications, and three separate elections (the §45Q(b)(3) rate election on parent Form 8933 Line 28, the §45Q(f)(6) applicable-facility election, and the §45Q(f)(3)(B) credit-transfer election). Each piece has its own evidence trail and its own failure mode at IRS exam, per IRS Form 8933 instructions (Rev. December 2025).

The fix is process, not heroics. Treat the §45Q engagement as a year-round documentation cycle rather than a return-prep task that starts in February.

Maintain a §45Q engagement folder with named subfolders for EPA Subpart RR MRV filings, ISO 27916 documentation, petroleum engineer or geologist certifications, supplier metric-ton reconciliations, and rate-election memos so reviewers do not chase sources during prep.
Update the Line 1 owner table and the Line 3 operator the day any operating-agreement or cap-table change closes; waiting until prep forces a same-week verification under §1.45Q-2(h).
Tie Line 20 metric-tons-delivered and metric-tons-stored to the EPA Subpart RR submission worksheet line for line; a single mismatch breaks the Line 21 attestation and triggers an amendment.
Document the §45Q(b)(3) election, any §6417 direct-pay election, and any §45Q(f)(3)(B) transfer election in writing before the return is started, not after the rate is plugged into Line 2g.
Run a quarterly recapture scan against the prior-year credit base; a leak, well failure, or storage breach during the recapture window pulls Form 4255 (with Schedule D (Form 8933) detail) into the current year.

Accountably handles the §45Q documentation cycle as a standing process: a dedicated preparer maintains the engagement folder year-round, a second-layer reviewer reconciles Line 20 to EPA filings before sign-off, and quarterly recapture scans run against the prior-year credit base. Our U.S. accounting and tax outsourcing services integrate into your workflow so the 8933 Schedule C cycle stays on a clean cadence rather than collapsing into a return-week scramble.

FAQs

What is Form 8933 Schedule C used for?

Schedule C (Form 8933) is the Enhanced Oil Recovery Operator Certification attached to Form 8933. It identifies each EOR project owner with operating interest percentage, the §1.45Q-2(h) operator, the project location, the secure-storage pathway (Subpart RR or ISO 27916), and every qualified carbon oxide supplier with delivered and stored metric tons. It is required when parent Form 8933 Part I Line 31 is Yes.

Who files Form 8933 Schedule C?

Schedule C (Form 8933) is required only when parent Form 8933 Part I Line 31 is Yes – that is, when the facility captures qualified carbon oxide, uses it as a tertiary injectant in a qualified enhanced oil or natural gas recovery project, and disposes of it in secure geological storage. Geological-sequestration-only and utilization-only claimants do not file Schedule C.

Can the Section 45Q credit be transferred to a third party?

The §45Q credit may be transferred under IRC §6418, but Schedule C (Form 8933) does not capture transferee information or §6418 election details. None of Schedule C's 21 numbered lines reference §6418. Schedule C is scoped to EOR operator certification – owners, operator, project, secure storage, and CO2 suppliers. The transfer election lives on the parent return.

What is the direct pay election for the 45Q credit?

Eligible entities may elect direct pay under IRC §6417, but Schedule C (Form 8933) does not document the §6417 election. None of Schedule C's 21 lines reference §6417, transferee data, or entity-type qualification. Schedule C is the Enhanced Oil Recovery Operator Certification.

When is Form 8933 Schedule C due?

Schedule C is filed with the taxpayer’s annual income tax return. For calendar-year C corporations, that means April 15 with a six-month extension available to October 15. Partnerships and S corporations are due March 15, extended to September 15. Transfer and direct-pay elections must appear on the original timely filed return.

What records must a taxpayer keep for the 45Q credit?

Taxpayers must retain annual monitoring and verification reports from a qualified independent engineer, CO2 metering and measurement records for each qualified facility, any credit allocation or transfer agreements, documentation supporting the applicable credit rate used, and prevailing wage payroll records. The retention window extends ten years from the date of sequestration to cover the recapture period.