7 Common Mistakes Farmers Make When Building a Crop Budget

I built myself a budget with the finest of intent, used somebody's average costs and guessed at what I spent. The numbers looked so pretty that I framed 'em on the wall — then harvest came along and proved they weren't good at all.

1. Using average costs instead of your actual costs

Generic university budgets are useful starting points, but they rarely match your land rent, your fertilizer program, or your machinery costs.

2. Ignoring all costs

Budgets that only include seed, fertilizer, and chemicals miss land, machinery ownership, interest, insurance, and overhead. The result is an overly optimistic profit number.

3. Using last year's yield without adjustment

Weather and management change. Using an unusually high or low yield year as your baseline skews every projection downstream.

4. Treating price as a single fixed number

Grain prices move. Building only one price scenario leaves you unprepared for downside risk.

5. Forgetting about government payments or insurance proceeds

These can meaningfully change the revenue side, especially in the difficult years — which is precisely when you need the budget most.

6. Looking only at whole-farm averages

A farm can be profitable overall while specific fields or crops are consistent losers. Field-level analysis reveals the problems averages politely cover for.

7. Never comparing scenarios

Running only one plan means you never test whether a different crop, input level, or rent structure would perform better.

How to Build More Useful Budgets

• Start with your real numbers.
• Include the full cost structure.
• Run multiple price and input scenarios.
• Save results by field so you can roll them into a whole-farm view.
• Update the budget when major assumptions change.