Depreciation Calculator

This calculator uses straight-line depreciation to allocate an asset’s depreciable cost evenly across its useful life. It does not estimate a resale price, cash balance, or tax bill. The calculation starts with the asset cost, subtracts the salvage value you expect at the end of the useful life, and divides the remainder by the number of years. In symbols, annual depreciation is (cost − salvage value) ÷ useful life. The monthly equivalent is the annual amount divided by twelve, and the ending book value is the salvage value in this simplified model. Cost is the amount placed in service under the accounting policy you are modeling. It may include directly attributable acquisition or installation costs, but the correct basis depends on the asset and the applicable accounting or tax rules. Salvage value is not what the asset is worth today. It is your estimate of what remains when the selected useful life ends. If you enter a higher salvage value, less cost is allocated and the annual expense falls. Useful life is the period over which you expect to consume the asset’s service, not automatically the period a tax table assigns. The result is an accounting allocation, not a payment. Depreciation reduces reported income or book value without sending cash out in the month it is recorded. The cash was generally spent when the asset was bought or financed. Conversely, a loan payment may include principal and interest but is not itself the depreciation expense. Keep those concepts separate when comparing operating cash flow with an income statement. The calculator deliberately uses straight line. The Internal Revenue Service explains in Publication 946 that tax depreciation can use prescribed recovery periods, conventions, and methods. Declining-balance methods recognize more expense earlier. MACRS is the federal tax system for many business and income-producing assets and can produce a schedule different from both straight line and the asset’s financial-reporting policy. A tax professional or accounting system should determine whether a special election, listed-property rule, bonus depreciation rule, or partial-year convention applies. Consider the edge cases before relying on the result. A salvage value cannot exceed the cost in a normal depreciable-basis scenario. A useful life of zero is invalid, and a negative life has no accounting meaning. If an asset is sold, impaired, improved, converted to personal use, or used partly for business, the basis and remaining life may need to be recomputed. A mid-year purchase may require a convention rather than twelve equal monthly entries. Use this calculator for a transparent first-pass schedule, replacement planning, or a comparison of useful-life assumptions. Use a tax depreciation calculator or your fixed-asset ledger when the question concerns a return, audited statements, or a disposal gain or loss. The business loan calculator can model the financing payment separately; it should not be used as a substitute for this non-cash expense calculation. Keep the invoice, placed-in-service date, method, life, salvage assumption, and review date with the asset record. If the asset is acquired partway through a reporting period, ask whether a half-year, mid-quarter, or monthly convention applies. If the asset is improved or disposed of, preserve the original basis and document the adjustment. The calculator’s value is its visible assumption set: cost, salvage, life, method, and date can be reviewed without confusing a simple straight-line schedule with a tax conclusion.