USDA’s October corn balance gives the United States a larger projected supply cushion even after allowing for more consumption and exports. The key calculation is a 407-million-bushel increase in available supply against a 125-million-bushel increase in use.
The result is a useful distinction for grain buyers and agricultural-market readers: demand can strengthen while the inventory outlook becomes less tight. Here is how the new forecast fits together, and what would change that interpretation.
Where the extra cushion comes from
The October 9 WASDE report puts ending stocks at 1,849 million bushels, compared with September’s 1,567 million. A larger carry-in and higher production outweigh the increase in use. The comparison is between two forecasts for the same marketing year, which began September 1.
The 282-million-bushel revision bridge
Million bushels · Vertical scale: 0 to 2,000
1,567 + 173 + 234 − 125 = 1,849 million bushels
Increase: 282 ÷ 1,567 × 100 = 18.0%
Reading the bridge prevents two errors. Adding only the production revision misses inventory carried into the season. Subtracting only the export change misses domestic uses. Both sides of the balance have to move together before the residual stock figure can be interpreted.
Open the underlying September–October balance
| Item | Sept. | Oct. |
|---|---|---|
| Beginning stocks | 1,922 | 2,095 |
| Production | 15,800 | 16,034 |
| Imports | 25 | 25 |
| Total supply | 17,747 | 18,154 |
| Total use | 16,180 | 16,305 |
| Ending stocks | 1,567 | 1,849 |
Supply minus use equals ending stocks. Ethanol sits inside food, seed and industrial use; adding it again would double-count consumption.
Why the denominator matters
A stockpile becomes more informative when measured against the activity it supports. Dividing ending stocks by total use gives 9.68% for September’s forecast and 11.34% for October’s. The increase is 1.66 percentage points, calculated before rounding.
That comparison says the projected buffer increased relative to expected use. It does not measure how long a particular buyer can operate without deliveries: inventories have different owners, locations and quality specifications, and the model contains no delivery schedule.
Test two hypothetical 100-million-bushel changes
These are arithmetic sensitivities, not USDA forecasts or probability estimates. Hold everything else in the October balance unchanged.
| Case | Ending stocks, million bu. | Stocks/use |
|---|---|---|
| Published baseline | 1,849 | 11.34% |
| Use rises by 100 | 1,749 | 10.66% |
| Production falls by 100 | 1,749 | 10.73% |
The same stock reduction produces different ratios because extra use also enlarges the denominator. The formulas are 1,749 ÷ 16,405 and 1,749 ÷ 16,305, respectively.
What buyers can take from this
The useful next question is which part of the balance changes next: carry-in, harvested output or use. A procurement decision still needs a delivered quote, freight availability, currency terms and the required delivery window. This national forecast cannot establish those commercial conditions.
These are provisional projections, not final harvest totals. The calculation supports a larger US inventory cushion under October’s assumptions; it supplies no forecast of a futures price, local basis or grocery bill.
Sources and method
- USDA WASDE 676, October 9, 2026, pages 1–2 and 12. Units and forecast vintages preserved.
- American Ag Network’s October 9 report, supporting release-date and headline cross-check.
Ratios, revision bridge and sensitivity cases are original calculations. Percentages are rounded only for display. No source chart or photograph is reproduced.
