Base Acre Update 101

Imagine receiving a government payment for a crop you no longer grow, while planting a different crop with stronger market prices. That scenario isn’t hypothetical. It is how the U.S. Department of Agriculture (USDA) commodity programs operate today—using base acres tied to historical production rather than current planting decisions. This system was implemented to ensure that payments would not be perceived as influencing what farmers plant, helping keep U.S. farm programs compliant with World Trade Organization (WTO) rules. While that structure made sense at the time, it now drives uneven payment outcomes and raises questions about fairness and accuracy.

What are Base Acres and How are they Used?

Base Acres are most commonly used to determine payments such as Agriculture Risk Coverage (ARC) and Price Loss Coverage (PLC), which rely on existing base acres from the USDA database. These acres report the designated acreage used to calculate commodity program payments and are not tied to what is planted in a given year. The last mandatory base acre update was in 1985, which shifted payments from planting decisions to historical base acres.

The 2002 and 2014 Farm Bills offered limited, voluntary base reallocation options. These updates did not require farms to align base acres with current planting patterns. The 2014 Farm Bill specifically allowed a one-time reallocation of base acres, but this was optional and did not automatically change base acres for all farms.

Why this Matters

Since farmers have not been required to update base acres since 1985, many farms continue to receive commodity program support based on planting patterns from decades past, even when actual planting decisions have drastically changed. This reliance on a historical base is why proposals such as the Balanced Agricultural Support and Efficiency (BASE) Act, introduced by Rep. Dusty Johnson and co-sponsored by Rep. Nikki Budzinski, seek to introduce a mandatory update requirement for the first time in over 40 years, changing how commodity support is distributed.

Illinois farmers largely plant corn on acres that are already reflected as corn base, meaning payments are generally more aligned with their rates. Meanwhile, farmers who shifted production away from cotton years ago may still benefit from their historical base that no longer matches what is being grown today—but continue to receive payments tied to historical cotton base acres.

Without a mandatory base acre update, historical base acres that do not reflect current planting practices will continue to influence who benefits most from USDA commodity support, even when farms across the country are producing the same crops.

IL Corn will continue to meet with legislators about this issue to improve the program's integrity. The analysis funded by the Illinois corn checkoff and the advocacy from the IL Corn Growers Association seeks to protect the future of farm safety nets and provide more accurate support for farmers today.

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From the Archives to the Field: A Student's Take on Illinois Corn History

By Tara Desmond • June 11, 2026

How much do you know about the farmers who came before you and the decisions that still shape Illinois agriculture today? That's what University of Illinois student Lyndon Shi set out to explore during his internship with IL Corn . What began as an archival research project became a deeper look at the history of farmer leadership, innovation and advocacy in Illinois. While digging through university archives, Lyndon uncovered an undigitized manuscript from agricultural economist Harold Guither explaining the case for checkoffs. When he mentioned the discovery to IL Corn Director Rod Weinzierl, he got an unexpected response: "Oh yeah, I know him. We worked with him." It was a reminder that agricultural history isn't as distant as it may seem. Lyndon's research connected two eras of the IL Corn Growers Association: the original organization founded in the 1890s and the modern ICGA established in the 1970s. He learned how University of Illinois agriculture dean Eugene Davenport helped organize corn growers and sent professors across the state on "Corn Gospel Trains" to share the latest farming research. One story stood out in particular: the adoption of hybrid corn. Farmers who once judged corn by the appearance of the ear had to shift their focus to yield. Lyndon sees a similar transition today, as farmers increasingly balance yield with profitability amid rising input costs. "Illinois corn farmers are very good at organizing, and they are genuinely very grassroots," Lyndon said. "They've had a much more active role in shaping policy rather than just being on the receiving end." This Summer and Fall, Lyndon will travel to Taiwan on a federal scholarship to study food security. He'll do so with a new appreciation for Illinois agriculture's global connections, including Taiwan's longstanding role as an important trading partner. Watch the full conversation on IL Corn TV to hear Lyndon's research firsthand and discover how Illinois corn's history continues to influence the future.