45Z Premiums: Four Record-Keeping Moves Before Farmers Bank a Dime

Credit buyers are currently paying just south of 90% of the face value of the Section 45Z clean fuel production credit — and none of that money reaches a farmer without a signed agreement with an ethanol plant. That single figure, from advisory guidance issued November 3, frames the practical reality for growers weighing whether to chase a 45Z premium in next year's crop plans.

The tax credit (Section 45Z of the federal tax code, a credit for transportation fuel with low carbon intensity) belongs to the ethanol plant, not to the farmer delivering grain. Better farm practices can raise the credit a plant earns when it sells, but any premium reaching the farm gate must flow through a deal with that plant. The IRS does not pay growers directly.

Why identical corn scores can still pay differently

Two ethanol plants buying grain with the same farm-level carbon intensity score may receive different credits. Their energy use and processing emissions differ, and the federal formula rounds the result. Plants also carry the tax audit risk and pay for verification. Growers who sign the required attestations take on responsibilities of their own.

The guidance is blunt about solicitation: be careful with anyone offering a guaranteed premium based on a calculator printout. Between the plant, the IRS and the credit buyers discounting the credit below full face value, several parties participate in setting the price.

What does USDA's final guidance ask farmers to do now?

Four documentation tasks define the starting line.

• Yield and acreage records. Pull field maps, acreage and crop insurance documents showing approved yields. The USDA Feedstock Carbon Intensity Calculator uses the approved yield for expected production and requires actual yield by field, adjusted to standard moisture — 14% for sorghum. Published yield alternatives exist for uninsured fields. A whole-farm yield estimate will not carry the weight.
• Fertilizer records. Field-level records of what was applied, where, when and how much, backed by receipts and application records. The rules call for a nutrient budget covering nitrogen, phosphorus and potassium. The IRS waived the advance-budget requirement for fuel produced in 2025 and 2026, but not the requirement to document actual applications — complete those budgets before future applications. Manure and nitrification inhibitors trigger additional product and testing records.
• Soil management records. Nutrient management can qualify on its own; cover crops and no-till are not mandatory for participation. Farmers claiming reduced tillage or no-till must supply equipment records and dates under USDA's tillage disturbance calculation, not a description of practice. No-till claims require a four-out-of-five-year commitment across the rotation. Cover crop records include seed purchases, seeding and termination dates plus photos showing establishment; residue photos help.
• Bushel traceability. Keep scale tickets and settlement sheets for all sales of covered crops — dates, buyers, bushels, moisture — and connect them to field production records. USDA permits grain mixing under mass-balance accounting (tracking volumes rather than physical segregation), but paperwork must still reach the plant directly or through an intermediary.

Participating farmers must sign a Biofuel Feedstock Report, retain records for five years and avoid selling the same carbon benefit twice.

How should growers pick a starting point?

Begin with the fields easiest to document and an ethanol plant ready to work with growers. Ask three questions before signing: how the plant calculates the value, who pays verification costs, and what happens if a claim is challenged.

There may be good money in 45Z, but the farmer's share will not be set by the best sales pitch — it will come down to records the plant can defend and a deal both sides can accept.