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Equipment Depreciation Calculator
Calculate equipment depreciation for tax deductions and cost recovery. Track asset value over time for construction equipment.
Depreciation Calculator
Calculate straight-line and accelerated depreciation for equipment
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How the Equipment Depreciation Calculator Works
A paid-off skid steer is not free. If you bought a CAT 262D in 2019 for $52,000 and you replace it in 2027 for $78,000, you owe yourself $26,000 in price escalation alone — that money has to come from billable hours between now and then. Equipment depreciation is how you translate that replacement reality into a per-hour rate that goes onto job costs.
The calculator runs straight-line depreciation, which is what most surety bonding agents and the AGC equipment cost reference both prefer for estimating. Tax depreciation under IRS Section 168 (MACRS) or Section 179 expensing is a different exercise — keep the books separate or you will end up bidding off your tax return instead of off real economics.
Ownership cost build-up
- Depreciable basis = purchase price - salvage value
- Annual depreciation = depreciable basis / useful life
- Hourly depreciation = annual depreciation / annual operating hours
- Ownership cost = depreciation + insurance + storage + financing + repairs
Estimating Steps and Checks
Anchor the basis
Use delivered cost, including freight, dealer prep, and any attachments billed at purchase. For salvage, look at completed Ritchie Bros or IronPlanet auctions for the same year and hours — not a dealer wholesale book that nobody actually pays.
Pin down life and utilization
A wheel loader on a busy aggregate yard might run 1,800 hours a year; the same machine at a small site contractor sees 600 to 800. Light utilization is the silent killer of equipment economics.
Run the per-hour math
Basis divided by years gives annual depreciation; divide by realistic operating hours for the per-hour figure that goes into bids.
Stack the rest of ownership cost
Add insurance (typically 1.5 to 3 percent of value annually), financing if applicable, yard storage, license/registration, and a replacement reserve. Fuel, filters, tires, and operator labor are operating costs and should sit on a separate line.
Common Checks
- AGC and Marshall & Swift both peg useful life on a Tier 4 mid-size excavator at 8,000 to 10,000 engine hours; if you are bidding off a 12,000-hour assumption, your hourly rate is light.
- Watch out: a machine sitting under 600 hours a year can have a true ownership cost over $80 per hour even if it looks paid off — the depreciation is real, the utilization just is not.
- Regional note: in salt-belt states (NY, MI, OH, MN) resale on undercarriage-heavy iron drops 10 to 15 percent faster than the Caterpillar Performance Handbook tables suggest. Adjust salvage accordingly.
- Field tip: pull a year of telematics data (CAT VisionLink, John Deere JDLink) and use the actual idle-vs-work split — most fleets are running 35 to 45 percent idle, which means real productive hours are lower than the hour meter shows.
Equipment Depreciation Calculator FAQs
Why use straight-line if tax law lets me accelerate?
Because bid rates need to reflect economic reality across the asset life, not a tax election. Section 179 might wipe out the basis in year one for the IRS, but the machine still costs you the same $26,000 to replace seven years later.
My accountant says the bobcat is fully depreciated — why am I still charging for it?
Tax depreciation is bookkeeping. Replacement is reality. The day you go to repower or replace the unit, the cash has to be there, and the only place to fund that is hourly recovery while the machine is still running.
How do I handle a rebuilt or repowered machine?
Treat the rebuild as a new basis: capitalize the rebuild cost, set a new useful life from the rebuild date (typically 60 to 70 percent of original life expectancy), and run depreciation forward from there.
Can I just look up rates in the Blue Book?
The EquipmentWatch Rental Rate Blue Book and FHWA Equipment Watch are useful sanity checks, but they assume average utilization and Midwestern wage zones. Build your rate from your own purchase prices and your own annual hours; use the Blue Book to challenge the answer.