Depreciation Calculator

You just bought a $25,000 delivery van for your business. Instead of deducting the whole cost at once, tax rules let you spread the expense over several years–this is depreciation. A depreciation calculator immediately shows how much you can write off each year, which method offers the best tax advantage, and what the asset will be worth on your books.

Depreciation is the systematic allocation of an asset’s cost over its useful life. It accounts for wear and tear, obsolescence, and usage, turning a large purchase into manageable annual expenses. Our free depreciation calculator supports multiple methods–straight‑line, double declining balance (DDB), sum‑of‑years‑digits, units‑of‑production, and MACRS–and generates a full year‑by‑year schedule.

To use the calculator, enter the asset’s original cost, salvage value, useful life (in years or units), and choose a method. The schedule shows yearly depreciation expense, accumulated depreciation, and ending book value for each period.

Why Use a Depreciation Calculator?

Manual depreciation calculations are tedious, especially with accelerated methods or MACRS tables that change yearly. A depreciation calculator removes the guesswork and instantly delivers:

• A complete depreciation schedule for financial reporting or tax planning.
• Side‑by‑side comparisons of different methods so you can pick the one that maximizes deductions early.
• Automatic handling of conventions like half‑year or mid‑quarter, which adjust the first and final year when an asset isn’t held for the full 12 months.

For businesses that own vehicles, machinery, computers, or buildings, the tool saves hours and reduces costly arithmetic errors.

Supported Depreciation Methods

Every method lowers an asset’s book value according to a different pattern. The calculator handles all five common approaches.

Straight‑Line Method

The simplest: divide the depreciable base equally over each year of service.

Formula:
Annual Depreciation = (Cost – Salvage Value) ÷ Useful Life

Example: A $10,000 machine with a $1,000 salvage value and a 5‑year life depreciates by $1,800 per year.

Declining Balance (including Double Declining Balance)

An accelerated method that applies a fixed rate to the beginning book value each year. The standard multiplier is 2 (200% DDB), but the calculator can use 150% or 175%.

Formula:
Depreciation = Book Value Beginning of Year × (Multiplier ÷ Useful Life)
When the calculated amount falls below the straight‑line amount, the method switches to straight‑line for the remaining years.

Example: With 200% DDB on the same $10,000 asset, first‑year depreciation is $4,000, second‑year is $2,400, and so forth, producing larger deductions early.

Sum‑of‑Years‑Digits (SYD)

Another accelerated method that weights the early years more heavily. The fraction uses the remaining life over the sum of the years.

Formula for year t:
Fraction = (Remaining Life) ÷ [n(n+1)/2]
Depreciation = (Cost – Salvage Value) × Fraction

For a 5‑year asset, the first year’s fraction is 5/15, the second is 4/15, etc.

Units‑of‑Production

Ties depreciation to actual usage rather than time. Best for equipment where wear depends on output.

Formula:
Depreciation per Unit = (Cost – Salvage Value) ÷ Total Estimated Units
Annual Depreciation = Units Produced in Year × Depreciation per Unit

Example: A $50,000 press expected to run for 200,000 cycles produces 50,000 cycles in year one → $12,500 depreciation.

MACRS (Modified Accelerated Cost Recovery System)

MACRS is the standard for U.S. federal tax depreciation, combining declining balances with a half‑year or mid‑quarter convention. Asset classes (3‑, 5‑, 7‑year, etc.) determine the recovery period. The calculator uses official MACRS percentage tables from IRS Publication 946 and applies the correct convention automatically.

How the Depreciation Calculator Handles MACRS

Under MACRS, you don’t enter salvage value because the method depreciates assets to zero over the class life. You select the property type (e.g., 5‑year for computers, vehicles; 7‑year for office furniture) and the convention. The calculator then pulls the corresponding table percentages and generates a tax‑ready schedule.

For assets placed in service after 2026, the IRS may apply bonus depreciation rules–check the latest limits. The calculator applies the base MACRS percentages; bonus depreciation can be entered as a separate adjustment if needed.

Year‑by‑Year Depreciation Schedule: What You’ll Get

Once you submit your inputs, the depreciation calculator produces a table with these columns:

• Year – the asset’s age (1, 2, 3, …)
• Beginning Book Value – the value carried from the previous year
• Depreciation Expense – the amount you can deduct that year
• Accumulated Depreciation – total depreciation taken so far
• Ending Book Value – Beginning Book Value minus Depreciation Expense

For straight‑line, the expense stays constant. For accelerated methods, high early expenses gradually shrink. In the final year, the ending book value equals the salvage value (or zero for MACRS).

Straight‑Line vs Accelerated Depreciation: Which Should You Choose?

• Straight‑line spreads the expense evenly, keeping taxable income stable. It’s preferred when an asset generates consistent revenue each year.
• Accelerated methods (DDB, SYD) front‑load depreciation, cutting taxable income sooner. Ideal for technology or vehicles that lose value rapidly in the first years.
• MACRS is mandatory for U.S. tax returns; it often accelerates write‑offs even further and can include bonus depreciation in the first year.

Use the calculator to run “what‑if” scenarios with different methods on the same asset. The tax savings difference over the first three years can be significant: for a $50,000 5‑year asset, DDB can deliver nearly $20,000 of additional deductions in the first two years compared to straight‑line.

Real‑World Example: Depreciating a $50,000 CNC Machine

A manufacturing company purchases a CNC router for $50,000 with a $5,000 estimated salvage value and a 7‑year useful life. They want to compare straight‑line and 200% DDB using the calculator.

Straight‑line:
Depreciable base = $45,000. Annual depreciation = $6,428.57 for seven years. Book value drops evenly.

200% DDB:
Year 1: $50,000 × (2/7) = $14,285.71 (no salvage considered yet).
Year 2: ($50,000 – $14,285.71) × (2/7) = $10,204.08.
The depreciation continues until it switches to straight‑line to reach salvage exactly.

The calculator instantly produces both schedules side‑by‑side, revealing that DDB yields $24,489.79 in depreciation over the first two years versus $12,857.14 under straight‑line–a difference of $11,632.65 that directly reduces taxable income earlier.

This calculator provides estimates for general informational purposes; consult an accountant or tax advisor for official filings and the latest tax law changes.