Depreciation Calculator

Buy a $50,000 machine that you expect to use for 5 years and sell for $5,000 at the end, and you do not record a $50,000 expense in year one. Instead, accounting spreads that cost across the years the machine actually earns its keep. With the straight-line method, that is $9,000 of depreciation every year - and this depreciation calculator shows you that figure plus a complete year-by-year schedule of how the asset's book value falls from $50,000 down to its $5,000 salvage value.

Depreciation is one of the most important concepts in business accounting because it follows the matching principle: the cost of a long-lived asset should be recognized over the same periods that benefit from using it, not all at once. This tool handles the two most common methods - straight-line and double-declining balance - and produces the schedule you would put on a balance sheet.

The depreciation formulas

The two methods this calculator supports use different formulas. Straight-line is the simplest:

Every year is identical, so the asset loses value in a straight line - hence the name. Double-declining balance (DDB) is an accelerated method that front-loads the expense:

Two things make DDB different from straight-line. First, the rate is applied to the asset's current book value, not to the depreciable base - so salvage value does not appear in the formula. Second, because book value shrinks every year, the dollar amount of depreciation shrinks too. You stop depreciating once book value reaches the salvage value.

Key terms you need to know

• Cost: the total amount you paid to acquire the asset and get it ready for use - purchase price plus shipping, installation, and setup.
• Salvage value: also called residual or scrap value, this is the estimated amount the asset will be worth at the end of its useful life. It is the floor that book value cannot drop below.
• Useful life: the number of years you expect to use the asset productively. For tax purposes the IRS assigns these by asset class.
• Depreciable base: cost minus salvage value - the total amount that will be expensed over the asset's life under straight-line.
• Book value: the asset's carrying value at any point in time: cost minus accumulated depreciation. It starts at cost and ends at salvage value.
• Accumulated depreciation: the running total of all depreciation taken so far, shown as a contra-asset on the balance sheet.

How to use this depreciation calculator

You only need four inputs to get a full schedule. Work through the fields in order:

1. Asset cost: enter the total purchase price, including delivery and installation costs that were needed to put the asset into service.
2. Salvage value: estimate what the asset will be worth at the end of its useful life. Enter $0 if you expect it to be worthless or fully written off.
3. Useful life: type the number of years you will use the asset. If you are doing tax depreciation, use the IRS recovery period for the asset class.
4. Method: choose straight-line for even, predictable expense, or double-declining balance for larger early-year deductions.

The big number at the top is the annual depreciation (for straight-line) or the first-year depreciation (for DDB, which then declines). Below it, the schedule shows each year's depreciation, the accumulated total, and the remaining book value.

Worked example 1: straight-line

A landscaping company buys a $50,000 mini-excavator, expects to use it for 5 years, and estimates a $5,000 resale value. The depreciable base is $50,000 − $5,000 = $45,000, so the annual depreciation is $45,000 ÷ 5 = $9,000 per year. After year one the book value is $41,000; after year five it is exactly $5,000, the salvage value. Every year's expense is identical, which makes budgeting and forecasting simple.

Worked example 2: double-declining balance

Take the same $50,000 excavator with a 5-year life. The DDB rate is 2 ÷ 5 = 40%. Year one depreciation is 40% × $50,000 = $20,000, leaving a book value of $30,000. Year two is 40% × $30,000 = $12,000, leaving $18,000. Year three is 40% × $18,000 = $7,200, leaving $10,800, and so on - each year smaller than the last. Compared with the flat $9,000 under straight-line, DDB lets the business deduct $20,000 in year one, which can be valuable when an asset earns the most when it is new.

Straight-line vs. double-declining balance, side by side

Here is how the two methods compare for that same $50,000 asset (5-year life, $5,000 salvage). Both eventually depreciate the asset down to its salvage value, but the timing of the expense is very different:

*The final DDB year is reduced so book value lands exactly on the $5,000 salvage value rather than overshooting it.

IRS recovery periods (common asset classes)

If you are calculating depreciation for U.S. federal taxes, you generally use the recovery period the IRS assigns to each asset class under MACRS rather than a guessed useful life. Common periods include:

These figures are illustrative; always confirm the correct class and period in IRS Publication 946. Note that MACRS also uses a half-year (or mid-quarter) convention and a built-in switch from declining balance to straight-line, which this book-depreciation calculator does not model.

Who this calculator is for

• Small-business owners estimating the annual expense of equipment, vehicles, or technology purchases.
• Bookkeepers and accountants building a quick depreciation schedule for the books or a fixed-asset register.
• Students learning the difference between straight-line and accelerated depreciation for an accounting or finance course.
• Landlords and real-estate investors getting a feel for how a long-lived asset is written down over time.
• Anyone budgeting who wants to understand the non-cash expense that lowers reported profit without affecting cash.

Why depreciation matters

Depreciation affects three things at once. It lowers reported net income on the income statement (it is an expense), it reduces the asset's book value on the balance sheet, and because it is deductible, it reduces taxable income and the cash you owe in tax. Crucially, depreciation is a non-cash expense: no money changes hands when you record it. That is why analysts often add it back when looking at cash flow, and why two companies with identical cash positions can report very different profits depending on their depreciation method.

How the schedule is used in real life

The numbers this calculator produces are not just academic - they flow straight into your financial statements and planning. Each year's depreciation expense appears on the income statement, lowering net income and, where the method is allowed, taxable income. The accumulated depreciation total and the resulting book value sit on the balance sheet as a contra-asset and the asset's carrying value. Lenders and investors read those figures to judge how old a company's asset base is and how much reinvestment may be coming. Internally, the schedule helps you plan: when an asset is nearly fully depreciated, it is often a signal to budget for a replacement. And because depreciation is added back on the cash-flow statement, the schedule is also a starting point for estimating free cash flow. Keeping an accurate, consistent schedule - rather than guessing the expense each year - is what makes the rest of these numbers reliable.

Choosing between the methods

There is no single "right" method - it depends on how the asset loses value and what you want your financials to show:

• Choose straight-line when the asset delivers steady value over its life (buildings, furniture, fixtures) and you want predictable, easy-to-explain expense.
• Choose double-declining balance when an asset is most productive when new and loses value fast (vehicles, computers, machinery), or when you want larger deductions early.
• For tax, the IRS often mandates a specific MACRS treatment regardless of your book choice, so many businesses keep two sets of depreciation - book and tax.

What changes the schedule the most

If you adjust the inputs and watch the schedule move, a few levers dominate the outcome:

• Asset cost: the single biggest driver. It sets the starting book value and, under straight-line, scales the annual expense directly.
• Useful life: a longer life spreads the same depreciable base over more years, so each year's expense is smaller. Under DDB it also lowers the rate (2 ÷ life), softening the early-year deduction.
• Salvage value: a higher salvage value shrinks the depreciable base under straight-line and raises the floor where DDB stops, so less total depreciation is recorded.
• Method: straight-line and DDB reach the same total, but DDB front-loads roughly half of the deduction into the first two years - a big difference for early-year profit and tax.

Because the method only changes timing, the choice rarely affects long-run totals - but it can swing reported profit, and therefore tax, by thousands of dollars in any single year.

Depreciation vs. amortization vs. depletion

Depreciation is one of three closely related ways accountants spread a cost over time, and they are easy to mix up:

• Depreciation applies to tangible long-lived assets - machinery, vehicles, equipment, and buildings - that wear out or become obsolete.
• Amortization applies the same matching idea to intangible assets such as patents, software, trademarks, and goodwill, almost always on a straight-line basis. The loan version of amortization - splitting payments into principal and interest - is a different use of the word; see the Amortization Calculator.
• Depletion applies to natural resources like timber, oil, and minerals, allocating cost as the resource is physically used up.

All three are non-cash expenses that lower reported profit and, where deductible, taxable income. Depreciation is simply the version that covers the physical assets most businesses own.

How depreciation fits the rest of your numbers

Depreciation rarely lives in isolation - it feeds into the broader picture of what your assets and products actually cost. To check the profitability of what you sell, use the Margin Calculator or Profit Margin Calculator; to set selling prices over cost, use the Markup Calculator. When a purchase is large enough to finance, the Business Loan Calculator shows the monthly payment alongside the depreciation expense, and the ROI Calculator and Break-Even Calculator help decide whether the asset pays for itself. If labor is the cost you are weighing instead, the Overtime Calculator and Hourly to Salary Calculator translate wages into real dollars. Together these tools give you a fuller view of what an asset or product truly costs your business.

Limitations and assumptions

• This is book depreciation, not a tax filing. It does not apply MACRS half-year/mid-quarter conventions or the automatic switch to straight-line.
• It assumes the asset is placed in service at the start of the year (no partial-year proration).
• It does not model bonus depreciation or the Section 179 immediate-expensing election, which can let small businesses deduct much of an asset's cost in year one.
• Salvage value and useful life are estimates; revising them later changes the schedule.
• It covers straight-line and double-declining balance only - not sum-of-the-years'-digits or units-of-production.

Sources

• Internal Revenue Service (IRS) - Publication 946, How To Depreciate Property (MACRS, recovery periods, Section 179).
• Internal Revenue Service (IRS) - About Form 4562, Depreciation and Amortization.