Declining balance
Some assets, like cars and machinery, depreciate more rapidly during the early years. Because of this, salvage value is not a consideration in the declining balance or double declining balance methods of calculating depreciation.
For fixed assets like these, the declining balance depreciation method is more appropriate because it takes this fact into consideration. Declining balance depreciation is calculated by multiplying the book value at the beginning of the year by the depreciation rate.
Formula:
Annual depreciation = Book value of asset at beginning of the year x Depreciation rate
Example:
A manufacturing company purchases a machine for $100,000. The machine has a useful life of 10 years and a depreciation rate of 20%. It is common practice to assign depreciation rates based on asset classes in the Income Tax Act (ITA). This doesn't always equal the depreciation rate calculated based on the useful life of an asset.
In this case, the useful life of 10 years would result in a 10% depreciation rate ($100,000/10 years = 10% per year).
Because manufacturing equipment has a 30% depreciation rate per the ITA, this company has opted to go with an average of the rate calculated using useful life and the rate suggested in the ITA (10% + 30% = 40%/2 = 20%).
In year one, declining balance depreciation is calculated as $100,000 x 20% = $20,000.
In year two, the current book value must be considered, so depreciation is calculated as the original purchase price of $100,000 minus the $20,000 depreciation expensed in year one ($100,000 - $20,000) x 20% = $16,000.
Double declining balance
Double declining balance is a variation of the declining balance method for calculating depreciation, and it is used where the declining balance method doesn't reflect how quickly an asset is depreciating. This is most often seen in the tech sector, where equipment can become obsolete quickly.
This method accelerates depreciation compared to the standard declining balance method. It achieves this by applying double the straight-line depreciation rate to the book value of an asset. This resulting increased depreciation expense reflects the more significant decrease in value during the early years of the asset.
The primary reason for using this method is to match the higher expense with the earlier, more productive years of the asset's life. This can be helpful when the asset's economic benefits decrease significantly over time, as seen in the tech industry.
To calculate double declining balance depreciation, follow these steps:
- Determine the straight-line depreciation rate, assuming a salvage value of zero: Straight-line rate = 100%/Useful life
- Double the straight-line rate: Double declining balance rate = 2 x Straight-line rate
- Calculate depreciation expense: Depreciation expense = Book value x Double declining balance rate
When recording depreciation expense, it's important to remember that the net book value of an asset cannot be a negative number. Since the formula calculates a percentage of the book value, it's highly unlikely this will occur, but it's something to watch out for nonetheless.
Example:
An IT firm buys new servers for $50,000 with an estimated life of 5 years.
- Calculate Straight-line rate (assuming zero salvage value): $50,000 / 5 years = $10,000/year (or 20%).
- Double the rate: 20% x 2 = 40%.
- Year 1 Depreciation: $50,000 (Book Value) x 40% = $20,000.
- Year 2 Depreciation: ($50,000 - $20,000) x 40% = $12,000.
Units of production
The units of production method of depreciation is best used for equipment where its usage can vary significantly from one period to the next. This method seeks to match expenses directly to how much the asset is used. Unlike methods that depreciate a fixed amount per year, this approach matches depreciation expense to actual output or usage.
Depending on the type of asset, the units of production (also referred to as units of measurement) can include:
- Kilometres (kms) driven (vehicles)
- Hours operated (machinery)
- Units produced (manufacturing equipment)
Formula:
Depreciation = (Cost of asset - Salvage value) / Total expected units
Example:
A transportation company buys a truck for $80,000 with a $5,000 salvage value and 200,000 km lifespan.
- Depreciation per km: ($80,000−$5,000)/200,000 kms=$0.375/km.
- If driven 25,000 km in the first year:
- Year 1 Depreciation: $0.375/km×25,000 kms=$9,375.
When considering which depreciation method to use, consider:
- The nature of the asset
- The use of the asset
- Industry best practices
- Compliance restrictions such as accounting standards and tax regulations