POLICY • NEWS • MARKETS
AG POLICY & MARKETS DAILY
FRIDAY, OCTOBER 2, 2026 | SPECIAL REPORT & ANALYSIS
MARKET PERSPECTIVE | CORN STOCKS
Corn Stocks Surprise Does Not Establish “Lazy” Elevator Reporting
Early harvest can distort feed/residual without misclassifying inventories
Analysis · October 2, 2026
USDA’s unexpectedly large Sept. 1 corn stocks estimate has prompted an allegation by some that elevators “lazily” counted newly harvested Delta corn as old crop. Early harvest can help explain a weak fourth-quarter feed/residual calculation, but the available evidence does not establish that reporting errors caused the surprise — or that misclassification is the only possible explanation.
THE NUMBERS
USDA’s National Agricultural Statistics Service reported 2.095 billion bu. of corn stocks on Sept. 1, compared with the 1.922 billion bu. carryout estimate in the September 11 World Agricultural Supply and Demand Estimates report. The 173-million-bu. difference represents a stocks-survey estimate exceeding an earlier balance-sheet estimate. Describing it as USDA “finding” corn can obscure that distinction. Sources: NASS Grain Stocks report and September WASDE.
Figure 1. NASS Sept. 1 corn stocks vs. the September WASDE carryout estimate. Source: USDA NASS; USDA WASDE.
The argument blaming elevators cites fourth-quarter feed/residual use of 513 million bu. and an estimated 290 million bu. of Delta corn harvested before Sept. 1. Those two figures have not been independently verified. Even if accurate, they would not by themselves demonstrate that new-crop corn was incorrectly included in old-crop inventories.
Table 1. Status of the figures cited in the “lazy reporting” argument. Source: USDA NASS; USDA WASDE.
THE EARLY HARVEST MECHANISM
The strongest part of the early harvest explanation involves consumption timing. When livestock feeders, processors or exporters use newly harvested corn during August, they can draw less grain from the previous harvest. More old-crop corn consequently remains in storage on Sept. 1, while calculated fourth-quarter feed/residual disappearance falls.
For example, an August feed buyer substituting 10 million bu. of new corn for old corn could leave 10 million additional old-crop bushels in storage. That outcome requires no elevator reporting mistake.
Table 2. Illustrative effect of 10 million bu. of August new-crop use. Source: article example; farmdoc daily; USDA ERS.
University of Illinois economists described this mechanism in a farmdoc analysis of early harvest and corn usage. They explained that consumption of new corn before the marketing year begins can reduce apparent old-crop feed/residual use and inflate the following marketing year’s first-quarter calculation.
USDA itself has acknowledged the effect. Its October 2010 Feed Outlook explained that early-harvested corn consumed before Sept. 1 was expected to appear as residual usage during the first quarter of the new marketing year. That provides a documented explanation for unusual quarterly usage patterns without assuming stocks were misclassified.
SURVEY DESIGN AND THE ACCOUNTING TRAP
The allegation of “lazy” reporting also must contend with USDA’s survey design. A published September commercial grain stocks questionnaire explicitly provides separate columns for old-crop and new-crop corn. Errors remain possible, but evidence from corrected responses, respondent records or a NASS review would be needed to establish that they materially inflated this year’s estimate.
A low feed/residual figure is not independent proof that stocks are wrong. Feed/residual is calculated from the supply-and-use balance rather than measured through a comprehensive tally of livestock feeding. Holding other inputs constant, higher ending stocks mechanically produce lower residual use. Using both figures as separate evidence of misreporting therefore risks counting the same accounting result twice.
Other explanations include feeding below expectations, errors in earlier quarterly stocks estimates, production revisions and changes in other usage data. Three strong quarters of implied feed/residual do not eliminate those possibilities. Farmdoc’s examination of historical stocks surprises identified production-estimate sampling errors as a likely explanation for several past controversies.
THE GEOGRAPHY
The geographic evidence also warrants scrutiny. Reported off-farm corn stocks in Arkansas, Louisiana and Mississippi combined totaled approximately 17.8 million bu. Delta corn could have moved elsewhere, but a theory attributing a substantial share of the national surprise to misclassification needs to identify where those bushels were stored. Harvested volume alone does not establish inventory remaining on Sept. 1.
Figure 2. Delta off-farm corn stocks on Sept. 1 compared with the national surprise. Source: USDA NASS Grain Stocks.
HARVEST TIMING AND THE HISTORICAL RECORD
Harvest timing cuts both ways. Arkansas corn was 65% harvested at the end of August, compared with 54% a year earlier and a 35% five-year average, so this year’s early harvest exposure was larger than normal. But an early harvest enlarges both explanations at once: it puts more new-crop corn in the hands of August feeders, processors and exporters, and it puts more new-crop corn in bins where it could be mistakenly counted as old crop. On the balance sheet the two produce the same pattern, with high Sept. 1 stocks, low fourth-quarter feed/residual and higher first-quarter residual in the new marketing year, so harvest timing alone cannot tell them apart.
Figure 3. Share of the Arkansas corn crop harvested by the end of August. Source: USDA NASS via University of Arkansas Cooperative Extension.
The historical record also argues against a systematic reporting bias. In 2012, nearly 1.2 billion bu. of corn was harvested before Sept. 1, compared with 200 million to 700 million bu. in each of the previous 20 years, yet old-crop stocks came in at 988 million bu., 138 million below the average trade guess. In 2013, when an estimated 460 million bu. had been harvested by Sept. 1, the trade underestimated Sept. 1 stocks by 21%. Last year, with the Arkansas harvest again running ahead of average, stocks topped the average trade estimate by 14.6%. If misclassification routinely inflated old-crop inventories, early harvest years would consistently produce upside surprises, and they have not. University of Illinois economists made the same point in 2014: some error in separating old and new crop should be expected, but not a bias in one direction.
The state-level stocks data point the same way. Off-farm corn stocks in Arkansas, Louisiana and Mississippi rose about 5 million bu. from a year earlier, to 17.8 million, but their share of national off-farm stocks held at about 1.4%, essentially unchanged from 2025. Most of the national increase sat in Illinois, Iowa, Minnesota and Nebraska, where off-farm stocks rose about 257 million bu. combined and where harvest had barely started: a week after Sept. 1, Illinois was 3% harvested and Iowa, Minnesota and Nebraska showed no harvest. Part of that increase reflects last year’s larger crop, and NASS withholds Delta on-farm stocks, so this is not proof. But if Delta elevators had padded old-crop inventories with new crop, the Delta’s share of off-farm stocks should have jumped, and it did not.
Table 3. Sept. 1 off-farm corn stocks by state, 2025 and 2026. Source: USDA NASS Grain Stocks.
THE YIELD CUSHION
The two-bushel yield cushion is reasonable arithmetic. Dividing 173 million bu. by USDA’s September harvested-area estimate of 88.5 million acres produces about 1.95 bu. per acre. Additional carry-in could therefore offset roughly a two-bushel yield reduction if acreage and use remain unchanged.
Table 4. The arithmetic behind the two-bushel yield cushion. Source: USDA NASS; USDA WASDE.
BOTTOM LINE
However, if early consumption explains part of the surprise, an offset could emerge in the following marketing year’s residual use. The full increase should not automatically be treated as a lasting addition to ending stocks.
AG POLICY & MARKETS DAILY | MARKET PERSPECTIVE | CORN STOCKS — FRIDAY, OCTOBER 2, 2026
