The Fixed Declining Balance Depreciation Calculator applies one specific interest-like rate, entered directly rather than derived from a factor and useful life, to an asset's remaining book value every year. Enter the asset's cost, salvage value, useful life and a chosen fixed rate such as 40%, and the calculator returns the full year-by-year expense schedule, ending precisely at the salvage value.
This method differs from the more common declining-balance and double-declining-balance approaches in one specific way: instead of deriving the annual rate from a factor divided by useful life, you state the exact percentage rate to apply directly. That makes it the right tool whenever a specific stated rate, rather than a multiple of the straight-line rate, is the number actually being asked for.
*These results are estimates for information only, not tax or accounting advice.*
Understand the fixed rate formula
The formula is straightforward: Annual Expense = Book Value x Fixed Rate, where the fixed rate is whatever percentage is entered directly rather than calculated from a factor.
That rate is applied to the asset's current book value at the start of each year, so as the book value shrinks, the resulting dollar expense shrinks along with it, even though the percentage rate itself never changes across the schedule.
Take an asset costing $10,000 with a $1,000 salvage value, a 5-year useful life and a chosen fixed rate of 40%. Year one expense is 40% of the full $10,000, or $4,000.00, leaving a book value of $6,000.00. Year two expense is 40% of $6,000.00, or $2,400.00, leaving $3,600.00. Year three continues at $1,440.00, leaving $2,160.00. Year four would be $864.00 under the plain 40% rule, leaving $1,296.00, and the final year is capped at $296.00, exactly enough to bring the book value down to the $1,000.00 salvage value precisely.
Notice this example lands on the same numbers as a double-declining balance calculation on the identical asset, because a 40% fixed rate happens to equal exactly 2 divided by 5 (the double-declining rate for a 5-year life). That overlap is coincidental to this particular rate and life combination, not a general rule; a different fixed rate would diverge from the double-declining path.
See how the chosen fixed rate changes the schedule
Because the rate here is entered directly rather than computed from useful life, choosing a fixed rate that does not correspond neatly to any standard factor still works exactly the same way.
A fixed rate of 25%, for instance, would apply a gentler acceleration than the 40% example above, front-loading less expense into the earliest years while still finishing at the same total depreciated amount by the end of the schedule.
This flexibility matters whenever an accounting policy, an industry convention, or a specific regulatory table specifies an exact declining rate to use, rather than leaving the rate to be derived from a chosen multiple of straight-line. The Fixed Declining Balance Depreciation Calculator applies that stated rate directly without requiring it to be converted into an equivalent factor first.
Watch the calculator close the schedule at salvage value
A fixed percentage applied to a continually shrinking balance never mathematically reaches zero on its own, which means a capping step is required for the schedule to terminate cleanly at the intended salvage value.
The Fixed Declining Balance Depreciation Calculator caps every year's expense so book value never falls below salvage, and in the last year of the useful life, it assigns exactly the expense needed to close the remaining gap to that salvage figure rather than under- or overshooting it.
In the worked example, the plain 40% calculation in year five would not have produced exactly $296.00 on its own; the calculator instead assigns that precise figure to bring the year-four book value of $1,296.00 down to the $1,000.00 salvage value exactly, with no residual balance left dangling afterward.
Compare a fixed rate to a factor-based declining rate
The related adjustable declining-balance method derives its annual rate from a factor divided by useful life, so entering a factor of 1.5 on a 5-year asset produces a 30% rate automatically.
The Fixed Declining Balance Depreciation Calculator instead skips that derivation step and takes the rate as a direct input, which is useful whenever the rate itself, not a multiplier against straight-line, is the figure specified by a policy, contract, or regulatory schedule.
Both approaches share the same underlying mechanic, a percentage of the current book value expensed each year, capped at salvage in the final period, and both will produce identical results whenever the fixed rate entered happens to equal what the factor-based version would have derived.
Know the limits of this calculation
This calculation applies the entered fixed rate uniformly across every year using a full-year convention, with no mid-year placement adjustment, bonus depreciation or Section 179 expensing layered on top.
Real tax and accounting standards may prescribe specific rates, conventions and asset class lives that should be confirmed independently before relying on a chosen fixed rate for an actual filing or financial statement.
Use the Fixed Declining Balance Depreciation Calculator to model a specific known rate quickly and see its full year-by-year effect. For a binding tax or accounting treatment, confirm the required rate and convention against current guidance or a qualified preparer.
Frequently asked questions
What is the formula for fixed declining balance depreciation?
The formula is Annual Expense = Book Value x Fixed Rate, where the fixed rate is entered directly and applied to the asset's current book value each year rather than derived from a factor and useful life.
How much does a $10,000 asset depreciate in year one at a 40% fixed rate?
At a 40% fixed rate, a $10,000 asset expenses $4,000.00 in year one, since the full original cost is still the book value before any depreciation has been deducted.
How is this different from the adjustable declining-balance method?
This method takes the annual rate as a direct input, while the adjustable declining-balance method derives the rate by dividing a chosen factor by the useful life. Both apply that rate to the current book value each year in the same way.
Why did the year-five expense not follow the plain 40% pattern?
The year-five expense is capped so the book value lands exactly on the salvage value rather than dropping below it. In the example, that means year five expenses exactly $296.00 instead of the uncapped 40% calculation.
Can the fixed rate be any percentage I choose?
Yes, the fixed rate can be set to any percentage that reflects the specific policy, contract or regulatory schedule being modeled. The calculator applies whatever rate is entered directly to the book value each year.
Summary
The Fixed Declining Balance Depreciation Calculator applies one directly entered percentage rate to an asset's current book value every year using Annual Expense = Book Value x Fixed Rate.
A $10,000 asset with a $1,000 salvage value, a 5-year life and a 40% fixed rate expenses $4,000.00 in year one, $2,400.00 in year two, $1,440.00 in year three, $864.00 in year four, and a capped $296.00 in year five to land exactly on salvage.
Choosing a different fixed rate changes how quickly expense is front-loaded without changing the total depreciated. Figures shown are estimates, not tax or accounting advice.