Can farmers claim the 45Z tax credit?

No. Farmers can't claim the 45Z tax credit themselves, because it goes to the registered producer of the clean fuel, such as an ethanol or biodiesel plant. Farmers benefit only if a plant, elevator or aggregator pays more for documented low-carbon grain, and nothing in the law requires anyone to share that value.

The credit is written into 26 U.S.C. 45Z. It pays up to $1.00 per gallon, before inflation adjustments, for fuel sold through December 31, 2029. The American Farm Bureau Federation notes the credit has no requirement to pass value through to growers. So treat 45Z as a possible new grain market, not a farm payment. If you want the plant's side of the math, see our guide to 45Z credits for ethanol.

The rules are still settling. USDA's final feedstock rule took effect July 29, 2026. We found no final Treasury 45Z regulations as of early November 2026, so producers are working from the proposed regulations.

How do farmers get paid under 45Z?

Farmers get paid through a private contract, usually as a premium per acre or bushel from a biofuel plant, elevator or aggregator. The farm's practices lower its grain's carbon intensity, that grain moves to the plant, and the plant's larger credit funds whatever incentive it chooses to offer. Terms vary from plant to plant.

USDA chose a mass balance system, so low-carbon grain has to physically move through the supply chain to the fuel. Many farm groups wanted book and claim, which would separate the carbon attribute from the bushel, and Agri-Pulse reports that's still a sore point for growers who sell to livestock feeders.

Timing matters too. The Iowa Soybean Association warns that you may pay for a practice early in the crop year and not see money until after harvest, delivery and possibly verification.

Which farming practices lower carbon intensity for 45Z?

USDA's Feedstock Carbon Intensity Calculator recognizes cover crops, grazed cover crops, no-till, reduced till, nitrification inhibitors, manure and a lower nitrogen rate per bushel. It covers corn, soybeans, sorghum and spring canola. Split in-season and spring-only nitrogen were dropped from the current version, so older advice may be out of date.

Version 1.2 of the USDA FD-CIC came out in September 2026 and scores each field separately. You enter location, practices, actual yield, expected yield and synthetic nitrogen per acre. According to farmdoc daily, the reference points are 6,020 g CO2e per bushel for corn and 7,682 for soybeans.

Three details catch people out:

• Location sets the soil carbon value. In Illinois, soil carbon reductions average 1,662 g per bushel for cover crops and 1,846 for no-till, but they vary by region.

• No-till is a rotation promise. 7 CFR Part 2100 requires no-till on all crops in the rotation at least four of every five years.

• Cover crops have timing rules. They must be seeded in the fall and can't be terminated with tillage.

Nutrient budgets are a timing trap as well. They have to be done before nutrients go on, so a 2027 crop plan may need attention before fall fertilizer. For the wider model, see our 45Z GREET guide.

How much is a lower CI score worth per acre?

A cover crop on Champaign County, Illinois corn could support about $99 per acre in total 45Z value, according to farmdoc daily, assuming 220 bushels and a plant scoring 20 kg CO2e per MMBtu outside feedstock. That's the whole pool at the plant, not a farmer's payment. It drops to about $39 at a less efficient plant.

The farmdoc math converts a 4,450 g per bushel score to 21.68 kg per MMBtu, at 2.7 gallons per bushel and 0.076 MMBtu per gallon. Add the plant's 20 kg and the fuel scores 41.68. That's $0.166 per gallon on 594 gallons per acre, or $98.80. A 15 kg plant lifts it to $158.20, and across Illinois counties the range runs from $0 to $243.

Here's a point that's easy to miss. Our math shows national-average corn at a 15 kg plant already supports about $67 per acre, so the cover crop adds roughly $91, not $158. And the statute rounds the emissions factor to the nearest 0.1, so a plant's actual rate moves in 10-cent steps. Try your own numbers below.

What are 45Z programs actually paying farmers?

Published figures are thin. In one Midwest program described to the Iowa Soybean Association, corn scenarios could pay about $30 to $50 per acre and soybean scenarios $0 to $12. Those are examples from one program, not standard rates, and early opportunities tied to the 2025 and 2026 crops are expected to be limited.

Weigh that against your costs. SARE puts cover crop costs at $15 to $78 per acre, with a $37 survey median. At that median, a $30 to $50 program barely covers a new cover crop on its own, though it looks better if you already use the practice for agronomic reasons. AgOutcomes' Adam Kiel told the association he sees 2027 as largely a learning year, with more opportunity in 2028 and 2029.

Why are soybean acres worth less than corn acres?

Soybean acres are worth less because most of the carbon benefit is assigned to soybean meal, which earns no 45Z value. The Iowa Soybean Association says roughly 20% goes to soybean oil, the part that becomes fuel. Corn's benefit flows to ethanol, so the same practice supports a bigger payment on a corn acre.

The association estimates no-till soybeans are worth about $8 to $10 per acre under current accounting, and about $35 per acre at 50 bushels under an alternative method it's studying. That second figure isn't available today, and changing the method could take years. Soybeans also face a longer supply chain, since grain usually passes through a crusher first.

What records do farmers need for 45Z?

Keep FD-CIC inputs and outputs plus proof of each practice for five years: field boundaries, actual and expected yield, nitrogen, tillage, cover crops and grain delivery. Accredited third-party verifiers audit a sample of farms, and farmers attest under penalty of perjury. If you can't document a practice, assume it won't count.

Expected yield usually means your crop insurance APH yield, and actual yield must be adjusted to standard moisture, which is 15.5% for field corn. There's one break for early crops: IRS Notice 2026-53 treats the pre-application nutrient budget as satisfied for fuel produced in 2025 and 2026, but nutrient applications must still be substantiated.

Can you combine 45Z with carbon credits or cost-share?

You can't sell the same carbon benefit twice. USDA's rule bars double selling CI attributes across markets, and current guidance doesn't allow the same acres in both a 45Z program and a private program such as the Soil and Water Outcomes Fund. Some public cost-share may combine with 45Z, so check each agreement.

Before you sign any low-carbon grain contract, get written answers to these questions:

• What practices am I agreeing to, and for how many years?

• How much will I be paid, and when?

• What could cost me the payment, including weather?

• What data do I hand over, and who can use it?

• Who claims the environmental benefit?

If you're part of a farmer-owned plant or co-op, there's a second question: how the plant turns its credit into cash. Many producers sell their 45Z credits to corporate buyers instead of waiting to use them, and that cash can help fund grower premiums.

Sources

• Cornell Legal Information Institute, 26 U.S. Code § 45Z, Clean fuel production credit

• Federal Register, Technical Guidelines for the Production of Regenerative Agricultural Biofuel Feedstocks

• eCFR, 7 CFR Part 2100

• IRS, Notice 2026-53

• USDA, Feedstock Carbon Intensity Calculator

• farmdoc daily, 45Z, Part 3: Reviewing the Potential Value

• farmdoc daily, 45Z, Part 4: Inside the Updated USDA Calculator

• Iowa Soybean Association, 45Z: What's in it for farmers?

• American Farm Bureau Federation, Ag-Powered Fuels: 45Z Clean Fuel Production Credit

• Agri-Pulse, High-stakes 45Z rules stoke hopes for farm economy revival

• SARE, Creating a baseline for cover crop costs and returns