Schedule D is the form I always build from the engineering data outward. The first time I handled a 45Q engagement, I made the mistake of opening the tax form before confirming that the verification report was complete. Every metric ton entered on Schedule D lives or dies by that third-party engineer’s signature – without it, the credit is opinion, not fact.
Download Form 8933 Schedule D PDF
Key Takeaways
- Form 8933 Schedule D is the facility-level data component of the carbon oxide sequestration credit return – it captures metric tons captured, disposal method, and the credit rate for each qualified facility.
- A separate Schedule D is required for each qualified facility; taxpayers with multiple capture sites file multiple Schedule D pages within the same Form 8933 package.
- The metric ton amounts on Schedule D must be supported by an annual verification report from a qualified independent engineer or geologist under Treasury Reg. §1.45Q-4.
- The applicable credit rate depends on both the type of carbon captured (industrial source vs. direct air capture) and the disposal method (geological sequestration vs. EOR vs. qualified utilization).
- CO2 that leaks from geological storage within ten years triggers recapture under Section 45Q(f)(4); Schedule D data is the reference point for calculating recapture amounts.
- Quick SOP rule: reconcile Schedule D metric tons against the independent verification report before filing – discrepancies between the two are an immediate audit flag.
What Form 8933 Schedule D Is
Form 8933 is the IRS return for the Section 45Q carbon oxide sequestration credit. The form is divided into schedules, each serving a distinct function. Schedule C, which I covered in a companion guide, handles taxpayer-level information – elections, co-owner allocations, and direct-pay or transfer decisions. Schedule D handles the facility-level facts: what was captured, where, how much, and how it was disposed of.
Every credit amount on Schedule C ultimately traces back to the metric ton data reported on Schedule D. If the two schedules don’t reconcile, the credit is unsupported. In an audit context, Schedule D is where the IRS starts – the physical data underlies everything else. Treat it as the most important document in the filing package, even though it often gets less attention than the election schedules.
A completed Schedule D for a single facility will include the facility’s name and address, the operator’s EIN, the type of carbon oxide captured (CO2, other greenhouse gas, or a mix), the total metric tons captured during the year, the amount disposed of by method, and the credit computed at the applicable rate per ton. For facilities with multiple disposal methods in a single year, the schedule breaks out each category separately.
Qualified Facilities and Minimum Capture Thresholds
Not every facility that captures carbon qualifies for the Section 45Q credit. The statute imposes a minimum annual capture threshold that the facility must meet to be considered a “qualified facility.” The thresholds vary by industry type:
| Facility Type | Minimum Annual CO2 Capture (Metric Tons) |
|---|---|
| Electricity generating units (power plants) | 500,000 |
| Other industrial facilities | 100,000 |
| Direct air capture (DAC) facilities | 1,000 |
| Enhanced oil recovery operations (co-production) | 500,000 (same as industrial) |
The minimum capture requirement is measured at the facility level, not per taxpayer. If the facility as a whole captures the required minimum, all co-owners are eligible to claim their allocated shares, even if a single co-owner’s individual share would not meet the threshold. That is a nuance I often explain to smaller working interest owners who assume their share has to exceed the threshold independently.
Disposal Categories and Credit Rates
The credit rate applied to each metric ton on Schedule D depends on how the CO2 was disposed of. The Inflation Reduction Act significantly restructured the credit rates and indexed them to inflation for years after 2026. Here is the current framework:
| Carbon Source | Disposal Method | Full Rate (2026+) | Reduced Rate (No PWA) |
|---|---|---|---|
| Industrial source | Geological sequestration | $85/metric ton | $17/metric ton |
| Industrial source | EOR / qualified use | $60/metric ton | $12/metric ton |
| Direct air capture | Geological sequestration | $180/metric ton | $36/metric ton |
| Direct air capture | EOR / qualified use | $130/metric ton | $26/metric ton |
The reduced rate applies when the facility did not meet the prevailing wage and apprenticeship (PWA) requirements during construction and repair activities. The difference between the full rate and the reduced rate is material – on a large facility capturing 100,000 metric tons of industrial CO2 for geological sequestration, the gap is $6.8 million per year. That makes PWA documentation one of the highest-stakes compliance items in the engagement.
Verification and Measurement Requirements
Treasury Regulation §1.45Q-4 establishes the monitoring, reporting, and verification (MRV) requirements that must be satisfied for each metric ton reported on Schedule D. The regulation requires:
- Metering at the point of capture – continuous monitoring equipment measuring CO2 mass flow at the capture point, calibrated to applicable EPA or industry standards
- Transportation tracking – records documenting CO2 volume from the capture point to the disposal or use site, accounting for any transportation losses
- Disposal confirmation – injection volume records for geological sequestration, or quantity consumed records for EOR and other uses
- Annual verification report – a report prepared by a qualified independent engineer or geologist confirming that the above data is accurate and that the CO2 was disposed of in the manner claimed on Schedule D
The verification report must be based on actual measured data, not estimates. I have seen engagements where the client’s facilities team provided approximations, expecting the engineer to back-calculate. That approach fails – the regulation requires actual metering. If the metering infrastructure was not in place for the full year, only the months with valid metering data generate a creditable credit.
Geological Sequestration Rules
Geological sequestration is the highest-value disposal method under Section 45Q. To qualify, the CO2 must be injected into a geological formation for permanent storage in a manner consistent with applicable EPA requirements under the Underground Injection Control (UIC) program, specifically Class II or Class VI well requirements.
Class VI wells are the gold standard for CO2 sequestration – they are specifically designed for CO2 injection and come with the most rigorous monitoring and post-injection site care requirements under the UIC program. Class II wells are used for EOR and have different (generally less stringent) monitoring requirements. Only injection into a formation with an approved site characterization and monitoring plan qualifies as “secure geological storage” for the higher credit rate.
The Recapture Window and Long-Term Monitoring
The recapture period under Section 45Q(f)(4) runs for ten years from the date of each CO2 injection. If CO2 migrates out of the formation during that window – confirmed by the ongoing monitoring and verification process – the credit is subject to recapture. The recapture amount is proportional to the metric tons that escaped.
In practice, this means the facility must maintain an approved monitoring plan and submit annual monitoring reports to the EPA for the full ten-year period after the last injection. Those reports feed into future Schedule D filings, even in years where no new credit is being claimed, to confirm that previously sequestered CO2 remains in place.
EOR and Qualified Utilization
CO2 used in enhanced oil and gas recovery (EOR) also qualifies for the Section 45Q credit, but at a lower rate. The CO2 must be used in a “tertiary recovery method” as defined in IRC Section 193(b)(3) – specifically, CO2 flooding in a domestic reservoir.
The taxpayer must have an IRS-approved EOR project plan or an amended plan on file. The plan is approved under Revenue Procedure 94-78 or updated guidance. Without an approved plan, CO2 injection into an oil reservoir does not qualify for the credit, even if it meets all other criteria. This is one of those details that gets missed when a client comes in mid-project assuming their EOR operations are automatically covered.
Qualified Utilization Beyond EOR
The IRA expanded “qualified carbon oxide utilization” beyond EOR to include CO2 used in the production of materials or chemicals where the CO2 is permanently fixed in the end product. This category covers applications like CO2 mineralization in concrete, CO2 used in fuel synthesis where the carbon is retained, and similar industrial uses. Treasury guidance on the specific qualifying uses is still evolving as of 2025, so verify the current Notice guidance before relying on this category.
How to Complete Schedule D
Schedule D is organized around individual facility-level entries. Here is how I work through each section:
Facility Identification
Enter the facility’s legal name and street address. This should match the name registered with the EPA for the facility’s UIC permit or emissions monitoring program. The facility operator’s EIN also appears here – if the taxpayer is an owner but not the operator, both EINs are referenced. For direct air capture facilities, enter the location of the capture equipment.
Carbon Oxide Capture Data
Report the total metric tons of carbon oxide captured at the facility during the tax year, as confirmed by the independent verification report. If the facility captures multiple types of carbon oxide (CO2 plus other greenhouse gases expressed as CO2 equivalents), report each separately. The IRS instruction details the conversion factors for non-CO2 greenhouse gases.
Disposal Breakdown
Break the total captured amount into the disposal categories used during the year. Report metric tons injected for geological sequestration separately from tons used in EOR and tons used for other qualified utilization. Apply the applicable credit rate to each category and sum to the total credit for the facility.
Multiple Facilities
Attach a separate Schedule D for each qualified facility. Number each schedule sequentially (Schedule D-1, D-2, etc.) and carry the total credit to the summary line on Form 8933. This is where I see co-owners of large midstream carbon capture systems get confused – the facility count follows the physical facilities, not the ownership interests.
Deadlines and Filing Requirements
| Taxpayer Type | Original Due Date | Extended Due Date |
|---|---|---|
| C Corporations (calendar year) | April 15 | October 15 |
| Partnerships and S Corps (calendar year) | March 15 | September 15 |
| Individuals | April 15 | October 15 |
| Tax-exempt organizations (Form 990-T) | 15th day of 5th month after year-end | 15th day of 11th month after year-end |
Schedule D is filed as part of the Form 8933 package with the taxpayer’s annual income tax return. There is no separate filing or extension for Schedule D alone. The annual verification report from the independent engineer should be completed and in hand before the return is filed, not attached to the return itself but retained as part of the tax records.
Recapture Rules
The recapture mechanism under Section 45Q(f)(4) is one of the more unusual aspects of this credit. If CO2 that was previously sequestered in a geological formation is later determined to have escaped, the credit attributable to those escaped metric tons is recaptured in the year the escape is confirmed. The confirmation comes from the ongoing monitoring process required under the approved EPA monitoring plan.
Recapture is computed by multiplying the escaped metric tons by the credit rate that was originally applied to those tons. The recapture amount is added to tax in the year confirmed. For transferred credits, the recapture falls on the transferee – this is why the transfer agreement must address recapture risk and allocation between buyer and seller.
From my side of the desk, the recapture risk is real but quantifiable. A well-characterized geological formation with proper Class VI well design and ongoing monitoring has a very low probability of leakage. But the tax return and engagement letter need to reflect that the risk exists, and the client should understand the tail on this credit.
Common Mistakes That Slow Things Down
- Reporting estimated metric tons rather than verified amounts – all amounts on Schedule D must come from actual metering data confirmed in the independent verification report, not facility engineering estimates.
- Mixing up geological sequestration and EOR disposal on a single facility – if a facility uses CO2 for both, each disposal method gets its own line with its own credit rate; do not aggregate and apply a blended rate.
- Using an outdated credit rate table – the IRA restructured rates in 2022 and inflation adjustments apply after 2026; always confirm the applicable year’s rates from current IRS guidance before computing the credit.
- Missing the qualified EOR project plan requirement – EOR disposal only qualifies if the facility has an IRS-approved project plan on file; assuming all oil field CO2 injection qualifies is an error.
- Filing a single Schedule D when multiple facilities exist – each qualified facility requires its own separate Schedule D.
- No PWA documentation, full credit rate claimed – the full credit rates require prevailing wage and apprenticeship compliance for construction and repair; claiming the full rate without PWA records is a common audit risk.
- Recapture exposure not modeled in engagement planning – the ten-year recapture window should be disclosed to clients and included in multi-year projection work.
Practical Checklists You Can Reuse
Copy these into your internal wiki or SOP.
Schedule D Pre-Filing Checklist
- Obtain annual verification report from qualified independent engineer for each facility
- Reconcile metric ton figures in verification report to metering records and transportation logs
- Identify all disposal categories used during the year (geological, EOR, qualified utilization)
- Confirm applicable credit rate for each category based on facility type and PWA compliance status
- Verify EOR project plan is on file with IRS if any EOR disposal is being reported
- Confirm Class VI well permit or UIC approval is current for geological sequestration facilities
- Prepare a separate Schedule D for each qualified facility in the filing
- Reconcile Schedule D totals to Schedule C allocation amounts before filing
PWA Compliance Documentation Checklist
- Identify all construction, alteration, and repair projects at or on the capture facility during the tax year
- Obtain certified payroll records from all contractors performing qualified construction work
- Confirm that wages paid met applicable Department of Labor prevailing wage determinations
- Verify that qualified apprentices from registered apprenticeship programs participated in the work
- Identify any PWA deficiencies and evaluate cure options (back wages plus interest plus 10% penalty)
- Retain all PWA documentation for the duration of the credit period plus standard audit period
Recapture Monitoring Checklist
- Calendar annual EPA monitoring report deadlines for each Class VI or Class II well site
- Track CO2 mass balance data from ongoing monitoring for the ten-year recapture window
- Flag any monitoring reports indicating unusual pressure changes or potential CO2 migration
- Maintain a ledger of credit amounts claimed by year and by metric ton for each sequestration site
- Disclose recapture risk in engagement letters for transferee clients who purchased 45Q credits
For Accounting Firms – Keep Delivery Smooth While You Scale
Energy credit engagements like 45Q require coordination across tax, engineering, and environmental compliance workstreams that most tax practices are not staffed to handle at volume. The preparation layer – assembling Schedule D data, reconciling metric ton reports, and building the credit computation from facility-level inputs – is time-intensive and methodical. That is exactly the kind of work that benefits from trained offshore capacity integrated into your workflow.
Accountably supports CPA firms with offshore tax preparation, workpaper assembly, and compliance support across energy credit, corporate, and partnership engagements. We keep this mention brief on purpose, your process comes first.
FAQs About Form 8933 Schedule D
What does Form 8933 Schedule D report?
Schedule D reports facility-level data for each qualified carbon capture facility. It captures the facility name and address, the EIN of the facility operator, the metric tons of carbon oxide captured and disposed of during the tax year, and the applicable credit rate for each category of carbon and disposal method. The schedule is the data foundation for the Section 45Q credit calculation.
How is the metric ton amount on Schedule D verified?
The IRS requires that captured CO2 amounts be supported by an annual verification report prepared by a qualified independent engineer or geologist under Treasury Reg. §1.45Q-4. The report must be based on actual continuous metering data, not estimates. It is retained with the tax records – it does not need to be attached to the return itself, but must be available on exam.
Can one taxpayer have multiple Schedule D filings?
Yes. A taxpayer with carbon capture equipment at more than one qualified facility must complete a separate Schedule D for each facility. All Schedule D pages are filed together as part of the Form 8933 package attached to the taxpayer’s annual income tax return.
What is a qualified enhanced oil and gas recovery project for 45Q purposes?
A qualified EOR project uses CO2 in a tertiary recovery method as defined in IRC Section 193(b)(3), specifically CO2 flooding in a domestic oil and gas reservoir. The operator must have an IRS-approved EOR project plan on file. CO2 used in a qualified EOR project qualifies for the credit at a lower rate than geological sequestration.
What happens if captured CO2 leaks from geological storage?
If CO2 leaks from a geological formation within ten years of sequestration, the credit is subject to recapture under IRC Section 45Q(f)(4). The recaptured amount equals the credit originally allowed for the leaked metric tons. For transferred credits, the recapture liability falls on the transferee, not the original credit seller.
Does Schedule D need to be filed separately from Schedule C?
No. Schedules C and D are both components of Form 8933 and are filed together as a single package with the taxpayer’s annual income tax return. Schedule C covers taxpayer-level information; Schedule D covers facility-level metrics. Both must be complete for the credit claim to be properly supported.
This article is educational, not tax advice. Rules change, and states differ. Confirm thresholds, deadlines, and elections against the current IRS instructions for your year and facts.