About the Depreciation Calculator
Depreciation Calculator helps estimate the key numbers involved in other decisions. It is designed for quick scenario comparison: enter a realistic set of values, calculate the result, then change one assumption at a time to see what has the greatest effect. Unlike a static table, the result responds to your inputs and keeps the calculation in your browser. Amounts are displayed in U.S. dollars for consistency, but the mathematical formulas can be used with another currency when every monetary input uses that same currency.
How to use this calculator
Enter values that match your situation and select Calculate result. Review the main result and its supporting figures, then change one input at a time to compare scenarios. Results are rounded for readability while the calculation retains additional precision internally.
Information you will need
- Initial value
- Salvage value
- Useful life
- Years elapsed
How the calculation works
Straight-line depreciation over useful life. Read the primary result together with the supporting values rather than focusing on one number alone. A useful estimate should make its assumptions visible. If the answer looks surprising, verify the unit, rate, time period, and whether the entered value is gross or net. Run a conservative and an optimistic scenario to understand the range of possible outcomes.
Formula or method
Annual = (value - salvage) / years.
Worked example
$30,000 with $5,000 salvage over 5 years = $5,000/year.
The example is illustrative rather than a recommendation. Use your own verified values and keep all monetary or measurement units consistent. When comparing alternatives, save or note each result so the assumptions do not become mixed.
How to interpret the result
The primary output answers the main question posed by the depreciation calculator, while the additional cards provide context. A result with many decimal places is not necessarily more certain. The displayed precision makes comparison easier, but uncertainty in the inputs can be larger than the rounding difference.
Compare the result with a second scenario using a less favorable rate, return, cost, or time period. This sensitivity check often provides more useful planning information than one best-case projection.
Limitations and important notes
The depreciation calculator is a planning tool, not a quote, filing calculation, lending decision, or promise of future performance. It does not automatically retrieve live market rates or apply every fee, tax bracket, program rule, product limit, or state law. Rules for products such as FHA, VA, Social Security, retirement accounts, and taxes can change. Confirm time-sensitive values with the lender, plan administrator, IRS, SSA, or another relevant authority before acting.
Frequently asked questions
How do I calculate depreciation?
The most common method is straight-line: annual depreciation = (asset cost - salvage value) / useful life. If you buy a machine for $50,000 with a $5,000 salvage value and a 10-year life, annual depreciation is ($50,000 - $5,000) / 10 = $4,500 per year. After 3 years, accumulated depreciation is $13,500 and the book value is $36,500. This calculator computes the annual expense, accumulated depreciation, and current book value for any asset using straight-line, and you can compare accelerated methods like double-declining balance to front-load the deduction.
What is the difference between depreciation and book value?
Depreciation is the annual expense that spreads an asset's cost over its useful life, a non-cash charge that reduces reported profit on the income statement. Book value is the asset's remaining value on the balance sheet: original cost minus accumulated depreciation. For a $50,000 asset depreciating $4,500 per year, book value is $45,500 after year one, then $41,000, and so on, until it reaches the salvage value at the end of its life. Many companies keep two schedules: straight-line for book reporting and MACRS for tax purposes.
What is the difference between straight-line and MACRS depreciation?
Straight-line spreads an asset's cost evenly: $10,000 over 5 years equals $2,000 per year. MACRS (Modified Accelerated Cost Recovery System) is the tax system the IRS requires for most property placed in service after 1986. It front-loads deductions using double-declining balance for 5- and 7-year property, so a $10,000 asset generates about 20% of its cost in year one and 32% in year two, roughly 52% within the first two years versus 40% under straight-line. Companies typically use straight-line for financial reporting (smooth profits) and MACRS on tax returns (bigger early deductions, better cash flow).
How does double-declining balance depreciation work?
Double-declining balance (DDB) is an accelerated method that applies twice the straight-line rate to the asset's remaining book value each year. For a $10,000 asset with a 5-year life, the straight-line rate is 20%, so the DDB rate is 40%. Year 1 depreciation = $10,000 x 40% = $4,000. Year 2 = ($10,000 - $4,000) x 40% = $2,400, and so on. Depreciation stops once book value reaches the salvage value, since the asset can never be depreciated below it. DDB suits assets that lose value quickly, like computers and vehicles.
What is the IRS recovery period for my asset?
The IRS assigns every asset a MACRS recovery period (class life): computers and most vehicles are 5 years, office furniture and fixtures 7 years, land improvements and some equipment 15 years, residential rental property 27.5 years, and commercial buildings 39 years. Land itself is never depreciable. Real estate under MACRS uses straight-line with a mid-month convention, while 5- and 7-year property uses double-declining balance with a half-year convention, meaning a 5-year asset actually spans 6 tax years. Check IRS Publication 946 for the exact class for your specific asset.
Can I depreciate an asset below its salvage value?
No. Under every common method, including straight-line and double-declining balance, an asset's book value can never fall below its estimated salvage (residual) value. If the calculated depreciation for a year would push book value below salvage, you simply take the smaller amount that brings it exactly to salvage, and depreciation stops. For example, a $10,000 asset with a $1,000 salvage value over 5 years is only depreciated down to $1,000, never to zero. If you later sell for more or less than book value, the difference is a gain or loss on disposal.
Does depreciation save my business money on taxes?
Yes. Depreciation is a deductible, non-cash expense, so it reduces taxable income. If you claim $10,000 in depreciation and your business tax rate is 25%, you save $2,500 in taxes that year, often called the depreciation tax shield. Accelerated methods like MACRS and Section 179 (which can deduct the full cost of qualifying equipment in year one, up to $1,250,000 for 2025) front-load these savings, improving cash flow. Because of the time value of money, getting the deduction earlier is usually better. Confirm current limits and eligibility with a tax professional.