Write down the job first
List the field task or operational bottleneck that needs attention. Estimate how often it occurs, what delays cost, and whether the need is seasonal or year-round. This helps keep a machinery decision tied to a real problem.
Count direct and indirect costs
Compare purchase or lease payments with expected fuel, maintenance, insurance, storage, operator time, training, and downtime. Include a reasonable estimate of resale value and the cost of parts or service support.
Compare other ways to get the work done
Repair, rent, custom hire, and shared ownership may all be worth evaluating. The best fit depends on timing, acreage, labor, and local availability. Put assumptions in writing and update them when conditions change.