The Depreciation Declining Balance Calculator applies an accelerated depreciation rate to an asset's remaining book value each year, rather than to its original cost, using a factor you choose to set how aggressive the acceleration is. Enter the cost, salvage value, useful life and a factor such as 1.5 for 150% declining balance, and the calculator returns the full year-by-year expense schedule.
Unlike straight-line depreciation, which expenses the same fixed dollar amount every year, declining balance depreciation expenses a percentage of whatever book value remains at the start of each year. Because that remaining balance shrinks every year, the dollar expense shrinks along with it, front-loading the largest depreciation charges into the earliest years of the asset's life.
*These results are estimates for information only, not tax or accounting advice.*
Understand the declining balance formula
The declining balance rate applied each year is Factor / Useful Life, and that rate is multiplied against the asset's current book value, not its original cost, to find each year's expense: Annual Expense = Book Value x (Factor / Useful Life).
Because book value falls every year, and the rate is a constant percentage of an ever-smaller number, the dollar expense naturally declines from one year to the next even though the percentage rate itself never changes.
Take an asset costing $10,000 with a $1,000 salvage value, a 5-year useful life and a chosen factor of 1.5 (150% declining balance). The rate applied each year is 1.5 divided by 5, or 30%. Year one expense is 30% of the full $10,000 cost, or $3,000.00, leaving a book value of $7,000.00. Year two expense is 30% of that $7,000.00 balance, or $2,100.00, leaving $4,900.00. Year three continues the pattern at $1,470.00, leaving $3,430.00. Year four would be $1,029.00 by the same 30% rule, leaving $2,401.00, and the final year's expense is capped at $1,401.00, exactly enough to bring the book value down to the $1,000.00 salvage floor without depreciating below it.
See how the chosen factor changes the acceleration
The factor is what makes this method flexible: a factor of 1.0 applies exactly the straight-line rate to the declining balance (still accelerated compared to true straight-line, since it is applied to a shrinking base rather than a fixed one), a factor of 1.5 produces 150% declining balance as shown above, and a factor of 2.0 produces double-declining balance, the most aggressive commonly used version.
The Depreciation Declining Balance Calculator lets that factor be set directly rather than locking it to one preset acceleration level.
Raising the factor pushes more depreciation expense into the earliest years and less into the later years, while the total amount depreciated over the asset's full life, from original cost down to salvage value, stays the same regardless of which factor is chosen, since every version of this method still stops exactly at the salvage floor.
Watch how the calculator handles the salvage floor
Because declining balance depreciation is a percentage of a shrinking balance, mathematically it would only approach zero after infinite years rather than reaching salvage value exactly, so a capping rule is needed in practice.
The Depreciation Declining Balance Calculator caps each year's expense so book value never falls below the salvage figure, and in the final year of the useful life, the expense is adjusted so book value lands exactly on salvage rather than stopping just short of it or overshooting below it.
That capping behavior is visible in the worked example above: the final year's uncapped 30% calculation would have produced a different figure, but the calculator instead assigns exactly $1,401.00 to close the remaining gap between the year-four book value of $2,401.00 and the $1,000.00 salvage target precisely.
Compare against fixed and double declining variants
A related fixed declining balance method uses one specific stated rate directly, rather than deriving the rate from a factor and useful life, and a double declining balance method locks the factor at exactly 2.0 rather than allowing it to be adjusted.
Both of those methods can be reproduced using this calculator's adjustable factor when the equivalent rate or factor is entered, which is why this calculator's flexibility makes it a useful reference point before choosing a more specific, named method for a particular filing or reporting requirement.
Know the limits of this calculation
This calculation applies the chosen factor uniformly across every year and assumes a full-year convention with no mid-year placement adjustment, bonus depreciation or other tax-specific timing rule layered on top.
Actual tax depreciation schedules, particularly under MACRS in the United States, follow specific IRS-prescribed conventions and asset class lives that may not match a freely chosen factor and useful life exactly.
Use the Depreciation Declining Balance Calculator to understand how an accelerated rate applied to a shrinking balance behaves, and to build planning estimates. For a filing, confirm the required method, factor and convention against current tax guidance or a qualified preparer.
Frequently asked questions
What is the formula for declining balance depreciation?
The formula is Annual Expense = Book Value x (Factor / Useful Life), applied to the asset's current book value each year rather than its original cost. This produces a rate that stays constant in percentage terms but a dollar expense that shrinks as the book value shrinks.
How much does a $10,000 asset depreciate in year one at a 1.5 factor over 5 years?
At a factor of 1.5 over a 5-year useful life, the rate applied is 30% (1.5 divided by 5), so a $10,000 asset expenses $3,000.00 in year one, the full 30% of its original cost since book value has not yet declined.
What does the factor control in this method?
The factor controls how aggressive the acceleration is. A factor of 1.0 applies the base declining rate, 1.5 produces 150% declining balance, and 2.0 produces double-declining balance, the most commonly used aggressive version of this method.
Why does the final year's expense not follow the same 30% pattern?
The final year's expense is capped so the book value lands exactly on the salvage value rather than overshooting below it or stopping short. In the example, that means the last year expenses exactly $1,401.00 instead of the uncapped 30% figure.
Does a higher factor change the total amount depreciated?
No, a higher factor changes how quickly the depreciable base is expensed, not the total amount depreciated over the asset's full useful life. Every factor still depreciates the full difference between cost and salvage value by the end of the schedule.
Summary
The Depreciation Declining Balance Calculator applies an adjustable accelerated rate, Factor divided by Useful Life, against an asset's current book value each year rather than its original cost.
A $10,000 asset with a $1,000 salvage value, a 5-year life and a 1.5 factor expenses $3,000.00 in year one, $2,100.00 in year two, $1,470.00 in year three, $1,029.00 in year four, and a capped $1,401.00 in year five to land exactly on salvage.
Raising the factor front-loads more expense into earlier years without changing the total depreciated over the asset's life. Figures shown are estimates, not tax or accounting advice.