- How reducing balance works
Apply the rate to the carrying value, which falls each year.
The reducing (diminishing) balance method charges a fixed percentage of the asset's carrying value each year:
- Year 1: the carrying value is the cost, so depreciation = cost × rate%.
- Year 2 onwards: the carrying value has fallen, so the same rate gives a smaller charge.
Example. A vehicle costs $20,000, depreciated at 25% reducing balance:
- Year 1: 25% × 20,000 = $5,000 → carrying value 15,000.
- Year 2: 25% × 15,000 = $3,750 → carrying value 11,250.
- Year 3: 25% × 11,250 = $2,812.50 → carrying value 8,437.50.
The charge falls each year because it is based on the shrinking carrying value.
- Depreciation = carrying value × rate% each year.
- Year 1 uses cost; later years use the reduced carrying value.
- The charge falls every year (highest in Year 1).
- Residual value is normally not used in the formula.
See the full worked example for reducing balance depreciation →