Straight Line Depreciation Method
The simplest and most commonly used method of depreciation is the straight line method.
The straight line depreciation method takes the purchase or acquisition price, subtracts the salvage value and then divides it by the total estimated life in years.
For example, an equipment worth $1m with an estimated life of five years and salvage value of $100,000 would have the following depreciation schedule and asset value after each year as shown below.
Depreciation Expense = (Total Acquisition Cost – Salvage Value) / Useful Life
The characteristics of the straight line method is that the depreciation expense is constant so the valuation of the company is easier as you know how to adjust it if necessary. Plus, it is easy to predict.
Accelerated Depreciation Method
As the name suggests, this method allows companies to write off more of their assets in the earlier years and less in the later years. The biggest benefit of this method is the tax benefit. By writing off more assets against revenue, companies report lower income and thus pay less tax.
The common method of accelerated depreciation is called the double declining balance (DDB) method. This is where the depreciation expense doubles the straight line depreciation expense of the first year. The same percentage is then applied to the non depreciated amount in the subsequent years.
DDB in year 1 = 2/n * (Total Acquisition Cost – Accumulated Depreciation)
where n = number of years
DDB in year 2 and beyond = 2/n * (Asset Value on Balance Sheet)
Straight Line vs Accelerated Depreciation
In order to make the comparison as fair as possible, let’s assume company XYZ is just starting out as a business and they bought several new computers for their staff. The purchase value of the computers is $10,000.
Computers do not have a long useful life, but five years is realistic and adequate. Computers also deteriorate in value much quicker in the first year than the later years so an accelerated depreciation method is more than satisfactory. At then end of five years, computers are generally worthless so the salvage value will be $0.
As I mentioned earlier, one of the benefits to accelerated depreciation is the reduction of taxes, but another point of great benefit is if the equipment requires maintenance.
Accelerated depreciation will offset the increasing maintenance cost and essentially equalizes the combined charges of both maintenance and depreciation. The graph below is a simplified view of how the accelerated depreciation and maintenance cost works out to give a straight line total expense.
If the straight line method was used, the depreciation would be constant and the maintenance cost would increase which would increase the total expenses.
To see this side by side, we get the following table using the same assumptions as before but with the added maintenance expenses.
At the beginning of the life, the accelerated method obviously costs more but towards the later stages of the useful life, the expenses become much less.
In the first article I wrote comparing the aggressive and conservative methods, I labeled accelerated depreciation as the aggressive method. Reason being that by quickly reducing the depreciation expense, later on, the net income increases only due to the account method.
In the example with maintenance cost included, just after one year, the depreciation expense is already close to equal to the straight line method. By year three, the expense is much less compared to the straight line method, and so more revenue can be recognized without any improvements in business.
The straight line method on the other hand does not alter the performance of the business. It can be seen as a revenue smoothing method.
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