Depreciation Calculator

Introduction

This Depreciation Calculator spreads an asset's depreciable base evenly over its useful life using the straight-line method. Enter purchase cost, salvage value at end of life, and life in years to see annual depreciation expense and remaining book value each period. Use it for cap-ex budgeting, small business books, and comparing straight-line against accelerated methods mentally. The output is book depreciation for planning; tax returns may use MACRS or Section 179 with different timing even when book stays straight-line.

Who this calculator is for

Bookkeepers setting up fixed asset schedules, owners buying equipment who want annual expense impact on profit, and students learning GAAP basics belong here. A $45,000 machine with $5,000 salvage over five years is the textbook straight-line case. Fixed asset audits compare subledger book value to this schedule; discrepancies often trace to partial-year convention omitted here.

Tax depreciation (MACRS, Section 179) follows IRS tables different from book straight-line; use this for management accounting unless you deliberately mirror simple books. When auditors ask for useful life support, document why five years matches expected production hours, not just tax convenience.

What it estimates

Depreciable base equals cost minus salvage. Annual depreciation equals base divided by life in years. Book value each year equals cost minus accumulated depreciation. Final year book value should equal salvage within rounding.

Partial year convention, mid-quarter, bonus depreciation, and impairment write-downs are not modeled.

Inputs explained

Salvage is expected residual value at end of useful life, not insurance value.

• Asset cost: Capitalized purchase price including delivery and install if capitalized, such as $45,000.
• Salvage value: Estimated scrap or resale at end of life, such as $5,000.
• Useful life: Years over which expense is recognized, such as 5.
• Placed-in-service date (optional): Labels schedule rows only.
• Method: Straight-line fixed; other methods need different tools.

How to read the results

Annual expense is flat each full year under straight-line. Accumulated depreciation stair-steps up; book value stair-steps down. Year five ending book value should sit at $5,000 salvage.

Multiply annual expense by marginal tax rate mentally for after-tax cash benefit of depreciation shields. Mid-year placed-in-service assets often use half-year convention in published GAAP examples; prorate first year manually if your CPA requires it.

Worked example

Cost $45,000, salvage $5,000, life 5 years. Depreciable base $40,000. Annual depreciation $8,000 per year. End of year one book value $37,000; end of year five book value $5,000.

Set salvage to zero and recalculate: annual expense $9,000. Total expense still sums to cost. Choose salvage reflecting realistic resale on vehicles or manufacturing gear.

Practical use cases

Forecast EBITDA after a fleet purchase. Compare lease versus buy when lease payments are flat but buy shows depreciation plus interest. Fixed asset registers in QuickBooks should match this schedule unless your CPA elects accelerated methods for tax only.

Feed annual expense into business loan DSCR planning with the business loan calculator when lenders add back depreciation for cash flow. When asset is fully depreciated but still productive, book value sits at salvage while maintenance capex may rise; plan replacement separately.

Limitations and related tools

MACRS accelerates early-year deductions for tax. Units-of-production method ties expense to usage hours. Lease accounting under ASC 842 uses right-of-use assets, not this simple purchase model.

Equipment lease payments: lease calculator. Loan financing for purchase: business loan calculator. Profit pricing after capital costs: margin calculator. Group assets with identical lives into one schedule row only when costs are combined on one ledger line.

How It Works

1. Enter asset cost. Type capitalized purchase amount including capitalized setup if applicable.
2. Set salvage and life. Enter expected salvage and useful life in whole years.
3. Generate schedule. Calculate to see annual depreciation and book value table.
4. Compare to tax method. If tax uses MACRS, run this for book and consult tax software for return numbers separately.

Formula and methodology

The Depreciation Calculator uses this identity for the scenario you enter. A bank, payroll system, or tax program may round on a 360-day year or average daily balance, so a statement can differ by a small amount.