Two operators with the same combine, doing the same 160-acre job at the same speed, width, fuel price, and repair cost, can need very different per-acre rates to hit the same margin. The difference is not the job — it is how many hours the machine runs across the whole year. Ownership cost is fixed for the year; hours used per year decides how thin or thick it gets spread.
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The job itself doesn't change. 160 acres, 4.5 mph, a 30-foot header, 75% field efficiency, $3.85/gal fuel at 12 gal/hr, $18/hr in repairs, $24/hr labor, and a 15% target margin — identical on both machines. What differs is hours used per year: one machine runs 250 hours across the season and every customer's ground, the other only 100.
Ownership cost per hour is the fixed annual cost divided by those hours. A $28,000-a-year machine costs $112.00 an hour to own when it runs 250 hours, and $280.00 an hour — two and a half times as much — when it only runs 100. Every job that machine does then carries that higher per-hour figure for however long the job takes.
| Figure | 250 hrs/year | 100 hrs/year |
|---|---|---|
| Ownership cost per hour | $112.00 | $280.00 |
| Hours for this 160-acre job | 13.0 hrs | 13.0 hrs |
| Fuel cost | $602.31 | $602.31 |
| Repairs & maintenance | $234.67 | $234.67 |
| Ownership cost (this job's share) | $1,460.15 | $3,650.37 |
| Labor cost | $312.89 | $312.89 |
| Total cost | $2,610.01 | $4,800.24 |
| Break-even rate | $16.31/ac | $30.00/ac |
| Rate at 15% target margin | $19.19/ac | $35.30/ac |
Fuel, repairs, and labor are identical in both columns — the field capacity, speed, and job size never changed. Only the ownership-cost line moved, and it alone is enough to push the per-acre rate up 84%. A published custom rate survey cannot see this: it reports one number per job type, not what a specific machine's annual utilization does to that number.
Because annual ownership cost — depreciation, interest, insurance, and housing — is a fixed dollar figure for the year regardless of how many hours the machine actually runs. Dividing that fixed cost by fewer hours produces a higher ownership cost per hour, and that higher per-hour figure gets charged against every job in proportion to how long it takes, whether the job itself is any different or not.
On a 160-acre job with identical field speed, width, fuel, and repair costs, a machine used 250 hours a year needs about $19.19 per acre to hit a 15% margin. The same machine, same job, used only 100 hours a year needs about $35.30 per acre — 84% more — because its $28,000 annual ownership cost is spread over 150 fewer hours.
Every hour the machine runs across the whole year — your own ground and every paying customer's field work combined, not just the hours on the job you are pricing right now. A machine that also covers 400 acres of your own ground before it ever does custom work for hire has a much lower ownership cost per hour than one that only leaves the shed for a handful of custom jobs.
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