Contractor field notes
Compare owning and renting at the same annual utilization
Equipment decisions depend on use, not purchase price alone. This calculator annualizes the purchase less expected resale value, includes the cost of tied-up capital, and compares ownership expenses with rental charges for the same operating days. It separately identifies upfront purchase cash.
Annualized ownership versus annual rental expense
Ownership = (purchase − resale) ÷ life + average invested capital × annual capital rate + annual fixed expenses + maintenance + daily operating expense × operating days. Rental = (daily rental rate + rental operating expense) × operating days + annual rental fees.
Worked example
A $60,000 machine with a $20,000 resale value after five years has $8,000 annual depreciation. An 8% capital rate on average invested capital of $40,000 adds $3,200. With $4,000 fixed expenses, $3,000 maintenance, and $60/day operating cost for 100 days, annual ownership is $24,200. Rental at $300/day plus $60/day operation and $1,000 annual fees costs $37,000. Ownership is $12,800 lower annually. Under these fixed-fee assumptions, costs cross at 57.33 operating days/year.
Common estimating pitfalls
- Do not add the full purchase price to annual depreciation again.
- Use comparable equipment and consistent fuel, insurance, delivery, and maintenance inclusions.
- A favorable annual cost does not establish that purchase cash or financing is available.
Frequently asked questions
Does this model loan payments or tax depreciation?
No. It uses straight-line economic depreciation and an annual capital-cost assumption. It is not a loan amortization, tax deduction, or cash-flow schedule.
Is owning always cheaper above the break-even days?
Not necessarily. The tool states which side is cheaper above or below a positive crossover. If ownership has higher variable cost, the direction reverses. Some assumptions have no positive utilization crossover.
What about weekly rental discounts or minimums?
Convert the applicable rental agreement into a representative daily rate and total annual fees. The model does not automatically apply minimum rental terms, changing delivery counts, or tiered discounts.
