Calculated from the sample figures using the displayed formula.
What is the double declining depreciation formula?
Beginning book value × (2 ÷ Useful life)Double-declining balance is an accelerated method that applies twice the straight-line rate to beginning book value.
What do the inputs mean?
- Beginning book value
- The value entered for beginning book value. Keep its period and units consistent with the other inputs.
- Useful life in years
- The value entered for useful life in years. Keep its period and units consistent with the other inputs.
How to calculate it step by step
- Define the decision.
Write down what the result will help you compare or decide. - Collect matching inputs.
Use figures from the same period and apply the definitions shown on this page. - Apply the formula.
Beginning book value × (2 ÷ Useful life). - Check the units.
Confirm whether the result is a currency amount, percentage, number of periods or ratio. - Test a second case.
Change one assumption at a time to see what drives the result.
Worked example
Using the sample figures in the calculator, the result is $20,000.00. Change one figure at a time and recalculate to see which assumption has the greatest effect. A spreadsheet should return the same result when it uses the same formula, units and timing.
When should you use double declining depreciation formula?
Use it when an asset’s benefits are consumed more heavily in earlier periods.
Limitations and common mistakes
Depreciation should not reduce book value below the residual value.
Do not mix annual figures with monthly figures, ending balances with averages, or percentages with whole numbers. Record the definition used so another person can reproduce the result.
Frequently asked questions
What is double declining depreciation formula?
Double-declining balance is an accelerated method that applies twice the straight-line rate to beginning book value.
How should I use double declining depreciation formula?
Use the formula only after matching every input to the same period, unit and definition. Then compare the result with a worked example and the decision you are trying to make.
What is the most common mistake with double declining depreciation formula?
Depreciation should not reduce book value below the residual value.
Can I calculate double declining depreciation formula in a spreadsheet?
Yes. Reproduce the displayed equation with separate cells for each input, keep percentages as decimals, and test the spreadsheet against the worked example before replacing the sample figures.
Sources and methodology
This page uses the IAS 16 Property, Plant and Equipment for the underlying financial or reporting context. Spreadsheet-related behavior is checked against Microsoft’s financial-function documentation. Examples are illustrative and use the formula displayed on the page.