What is vehicle depreciation?
Depreciation spreads the cost of a vehicle over the years it is used. Each year part of the cost moves from the balance sheet to the income statement as an expense, and the vehicle's book value (cost minus accumulated depreciation) falls until it reaches the residual value: what you expect to get for it at the end of its useful life.
This vehicle depreciation calculator builds the yearly schedule for one vehicle or a group bought together. Choose straight-line, declining balance (your own rate or double-declining) or units of production by kilometer. Start from the in-service date, with a partial first year if your financial year is already under way. It shows opening book value, depreciation, accumulated depreciation and closing book value for each year, the monthly figure, and the book value at the end of any month you pick. A second tab compares all three methods on the same vehicle.
Why the depreciation schedule matters to fleet managers
- It is part of the cost of every vehicle. Depreciation is a large part of the fixed cost of owning a vehicle, and it belongs in cost per kilometer and lease-versus-buy comparisons.
- Book value drives disposal decisions. Selling above book value gives a gain and selling below it a loss. Knowing the book value before a sale avoids surprises in the accounts.
- Finance needs the monthly figure. Monthly depreciation goes into management accounts and budgets for each vehicle or cost center.
- The method changes the timing. Declining balance puts more cost in the early years, when resale values tend to fall fastest. Straight-line keeps the charge even.
What you need to calculate depreciation
| Input | Where to find it | Tip |
|---|---|---|
| Purchase cost | Supplier invoice, fixed asset register | Include costs your accounting policy adds to the asset, such as delivery or body fit-out. Leave out recoverable VAT if your policy does. |
| Residual value | Recent resale prices, dealer buy-back terms | Use what you expect to receive at the end of the useful life, net of selling costs. |
| Useful life | Company accounting policy, replacement plan | Base it on how long you actually keep this type of vehicle, not on its physical life. |
| In-service date | Delivery note, registration, first trip | Depreciation starts when the vehicle is available for use. |
| Lifetime and yearly distance | Odometer records, trip reports | Only needed for units of production. Use the distance at which you normally replace the vehicle. |
How is vehicle depreciation calculated?
Straight-line depreciation
Declining balance and double-declining balance
Book value never goes below the residual value. Without the switch, the last year of the useful life takes whatever is left above the residual value.
Units of production (per kilometer)
Partial first year and book value at a date
Choose "12 months from in-service date" to make every year a full 12 months that starts in the in-service month.
Worked example: depreciating a delivery van
A delivery van costs 120,000 and goes into service on 1 April 2026. The company expects to use it for 5 years and sell it for 30,000. The financial year ends in December, so year 1 runs from April to December 2026: 9 months.
- Straight-line: 90,000 ÷ 60 months = 1,500 a month. Year 1 carries 9 × 1,500 = 13,500, years 2 to 5 carry 18,000 each, and the last 3 months (January to March 2031) carry 4,500. Book value at the end of December 2027 is 120,000 − 13,500 − 18,000 = 88,500.
- Double-declining (40%): year 1 is 120,000 × 40% × 9 ÷ 12 = 36,000, leaving 84,000. Year 2 is 84,000 × 40% = 33,600, leaving 50,400 at the end of December 2027. Year 3 is 20,160, and in year 4 only 240 is left before the book value reaches the 30,000 residual value.
- Units of production: with a lifetime of 300,000 km, the rate is 90,000 ÷ 300,000 = 0.30 per km. At 75,000 km a year, year 1 covers 56,250 km (16,875) and each full year 22,500. Book value at the end of December 2027 is 80,625, and the van reaches 300,000 km in March 2030, a year before the end of its useful life.
- Comparison: the gap in book value is largest at the end of year 3 (December 2028): 70,500 under straight-line against 30,240 under double-declining, a difference of 40,260.
How to read your results
- Book value at a date is the figure to compare with a sale offer. A price above it is a gain on disposal, a price below it a loss.
- Monthly depreciation is the charge for each month of the year that includes your chosen date. Under declining balance and units of production it changes from year to year.
- Accumulated depreciation is the total charged so far. Cost minus accumulated depreciation equals book value.
- The comparison tab shows timing only. Every method charges the same total; the choice belongs to your accounting policy, which should reflect how the vehicle's benefits are used up.
Common mistakes in vehicle depreciation
- Depreciating down to zero. Most vehicles still sell at the end of their useful life. Ignoring the residual value overstates the yearly charge.
- Charging a full year in year 1. A vehicle that enters service in October should carry about 3 months of depreciation in that financial year, not 12.
- Mixing book and tax depreciation. Tax rules can set their own methods and rates. Keep the two schedules separate.
- Never reviewing estimates. If vehicles stay longer or resale prices change, update the useful life and residual value and spread the remaining amount over the years left.
- Guessing distance. Units of production is only as good as the kilometers behind it. Use odometer or trip records.
Assumptions and limits
Results are estimates based on the values entered. The calculator charges the in-service month in full; some policies use a half-month, half-year or daily convention, which gives slightly different figures. It does not handle impairment, revaluation, disposals before the end of life, changes in estimates part way through, or components with different lives. It shows book depreciation only. Follow your company's accounting policy (for example under IFRS). Tax depreciation rules in Saudi Arabia, the UAE and other countries can differ from book depreciation, and this tool does not apply any tax rates; check with your accountant or tax adviser.