§45Z Clean Fuel Production Credit: Buyer Guide to Transferable Gallons

Section 45Z is the clean fuel production credit: an income tax credit for clean transportation fuel produced in the United States after December 31, 2024, and sold by December 31, 2029. It is on the §6418 transferable-credit list, so an eligible producer can sell the credit for cash to an unrelated buyer. This buyer-focused guide covers how the credit is calculated, current dates under IRS guidance and the OBBBA, diligence points that differ from an ITC purchase, and why many buyers still find §48E inventory easier to source.

What §45Z is

Per the IRS Clean Fuel Production Credit page, the credit applies to clean transportation fuel produced domestically and sold between January 1, 2025, and December 31, 2029. Fuel falls into two broad categories: sustainable aviation fuel (SAF) and non-SAF transportation fuel. The credit equals the product of (1) an applicable amount per gallon (or gallon equivalent) and (2) the fuel’s emissions factor under the Code. Producers claim it on Form 7218 with the return.

A producer cannot claim the credit unless registered as a clean-fuel producer at the time of production (Form 637, Activity Letter “CA” for SAF and/or “CN” for non-SAF). See Notice 2024-49 on registration timing.

Transferability under §6418

§45Z is an eligible credit under §6418(f)(1). An eligible taxpayer (not an applicable entity using elective pay) may elect to transfer all or part of the credit to an unrelated buyer for cash. The election is irrevocable, made by the return due date (including extensions), and both parties use the Form 3800 transfer process with a registration number and transfer election statement. See our §6418 guide and Form 3800 reporting guide.

The Instructions for Form 3800 state that transferring the §45Z credit is only permitted for fuel sold or used after June 30, 2025. OBBBA also restricts transfers of certain credits, including §45Z, to a specified foreign entity; buyers should confirm FEOC representations with counsel.

How the credit amount is built

Instructions for Form 7218 (Rev. December 2025) explain the building blocks:

• Applicable amount (before inflation). For fuel produced and sold in calendar year 2025: non-SAF $0.20 without prevailing wage and apprenticeship (PWA) compliance, or $1.00 with PWA; SAF $0.35 without PWA, or $1.75 with PWA. For fuel produced after 2025, the Form 7218 instructions state the pre-inflation amounts are $0.20 without PWA or $1.00 with PWA per gallon (or gallon equivalent), for both SAF and non-SAF.
• Inflation. The applicable amount is multiplied by the inflation adjustment factor for the sale year (Notice 2025-37 addresses 2025 factors; Form 7218 instructions illustrate 2025 inflation-adjusted cents).
• Emissions factor. Multiplies the applicable amount. Lower lifecycle greenhouse gas intensity generally means a higher factor (closer to 1.0 for cleaner fuel). Notice 2025-11 discusses allowed methodologies, including the 45ZCF-GREET model (and CORSIA pathways for SAF).
• PWA. Meeting prevailing wage and apprenticeship rules (with special timing for facilities placed in service before 2025) unlocks the higher applicable amount. Form 7220 may be used for PWA verification and corrections.

Buyers do not recalculate gallons themselves in diligence; they test whether the producer’s registration, emissions pathway and PWA story support the credit face value being transferred.

Current status and dates (what the sources say)

• Production window: fuel produced after December 31, 2024 (IRA).
• Sale window: IRS page: sold between January 1, 2025, and December 31, 2029. OBBBA amended §45Z; proposed regulations published in the Federal Register on February 4, 2026, describe the credit for fuel produced after December 31, 2024, and sold by December 31, 2029. Treat proposed rules as proposed until finalized.
• North American feedstock: for fuel produced after December 31, 2025, the IRS page requires feedstock exclusively produced or grown in the United States, Mexico or Canada.
• Transfer timing: Form 3800 instructions—transfer only for fuel sold or used after June 30, 2025.
• Guidance stack: Notice 2024-49 (registration), Notice 2025-10 (intended proposed regulations / comments), Notice 2025-11 (emissions rates / 45ZCF-GREET), Form 7218 instructions, and the February 2026 proposed regulations.

Buyer diligence checklist

1. Producer registration. Confirm Form 637 registration (CA and/or CN) was effective at production. A registration letter is not itself a determination that the fuel qualifies.
2. Pre-filing registration for the transfer. §6418 transfers still need IRS pre-filing registration and a registration number on the return, separate from the §4101/Form 637 producer registration.
3. Emissions-rate support. Ask which methodology and model version were used (45ZCF-GREET as of the first day of the production year, or an allowed CORSIA pathway for SAF) and retain the producer’s worksheets or certifications your counsel requests.
4. Gallons, sales and qualified-sale facts. Match transferred credit to fuel sold to an unrelated person in a qualified sale during the year.
5. Producer strength. Ask who stands behind the credit economically: the operating producer, a parent guaranty, or other credit support. A thin special-purpose seller with little substance left after the sale is a diligence flag for your counsel, not a reason to skip documents.
6. PWA and inflation. If the face value assumes the higher applicable amount, obtain PWA support; confirm the inflation factor year.
7. Feedstock geography for post-2025 production (U.S., Mexico or Canada per the IRS page).
8. FEOC / specified foreign entity representations after OBBBA.
9. Indemnity and insurance. Negotiate how disallowance, excessive-transfer exposure and related costs are allocated. Tax credit insurance, if offered, is a contract product with exclusions—read the binder with counsel. Neither indemnity nor insurance replaces primary diligence.
10. Risk allocation vs ITC recapture. §45Z is a production credit, not an investment credit. Buyers of §48E ITCs inherit five-year §50-style recapture if the property stops qualifying; that ITC recapture pattern does not map onto gallons of fuel already produced and sold. Buyers still face IRS exam risk, credit reduction if the producer overstated the credit, and the §6418 excessive-credit-transfer charge (generally a 20% addition on excess unless reasonable cause).

Pricing pointer

Like other §6418 credits, §45Z trades at a discount to face value. The discount reflects emissions-score uncertainty, producer creditworthiness, documentation quality, timing versus estimated payments, and how indemnity is written. We do not publish a guaranteed cents-on-the-dollar figure. For how buyers compare all-in cost on transferable credits generally, see §48E pricing and discount (mechanics carry over; the risk profile differs).

Why §48E is often more readily available

§45Z supply depends on registered producers selling qualifying gallons each year through 2029. §48E covers a broader set of zero-GHG electricity facilities and energy storage technology, with a deeper, more standardized transfer market for many buyers’ tax-year sizes. Storage and other non-wind/non-solar technologies are not under the same OBBBA early wind/solar cutoff. If your goal is a cash purchase of transferable credits to offset federal income tax, start with the §48E buyer guide and §48E eligible technologies, then compare a §45Z offer only when the gallons, emissions file and price clear your advisors’ bar. Side-by-side context: §48E vs other transferable credits.

Educational information only, not tax, legal or investment advice, and no outcome is promised. Rules and figures were checked against the cited sources on November 6, 2026; they change, so confirm with your CPA and counsel before acting. Veritas does not offer or solicit investments. See our disclaimer.