What it means
When a business buys equipment it does not record the whole cost as an expense on day one. The cost is spread across the years the asset will help earn revenue, and the depreciation rate is the dial that controls how fast that spreading happens.
The rate follows directly from useful life. An asset expected to last ten years carries a straight-line rate of about 10% a year and one expected to last four years carries 25%, while residual value, meaning what the asset is worth at the end, reduces the amount being spread.
Method matters as much as life. Straight-line charges the same amount every year, whereas reducing balance applies a fixed percentage to a shrinking carrying value, front-loading the expense to match assets that lose most of their value early.
The rate feeds profit, tax and the numbers managers are judged on. Rates set too low flatter early profits and leave an overstated asset on the balance sheet, while rates set too high depress reported earnings and can make a productive division look weaker than it really is.
Tax rules and accounting rules often disagree here. Many tax systems prescribe their own capital allowance rates regardless of the useful life management has chosen, which is why depreciation in the accounts and the deduction in the tax return are rarely the same number.
In practice
Real-world examples.
Example
A courier company buys a van for $40,000, expects five years of service and a $10,000 trade-in value. Annual depreciation of $6,000 gives a rate of 15% of cost, and the figure is used to price delivery contracts realistically.
Example
A restaurant spends $180,000 on a fit-out under a ten-year lease with no expected residual value. It depreciates at 10% a year, or $18,000, so the expense matches the period over which the space actually generates trade.
Example
An accountancy firm buys 120 laptops at $2,000 each, a total of $240,000, and writes them off over three years at roughly 33% a year. The $80,000 annual charge makes the replacement cycle visible in the budget instead of arriving as a surprise.
Think of it
“Depreciation rate is how fast you write off asset value-the annual depreciation percentage.
Formula
Calculation
Straight-line annual depreciation = (Cost - Residual value) / Useful life
Depreciation rate = (Annual depreciation / Cost) x 100
A bottling line costs $250,000, is expected to last 8 years and should be worth $50,000 at the end. Annual depreciation is ($250,000 - $50,000) / 8 = $25,000, so the depreciation rate measured on original cost is $25,000 / $250,000 = 10% a year.
Using a reducing balance method at 25% instead produces a very different profile. Year one charges $250,000 x 25% = $62,500 and leaves a carrying value of $187,500; year two charges $187,500 x 25% = $46,875. The total cost written off over the asset's life is similar, but the early years absorb far more of it.Case study
Seen in the real world.
Fenwick Bottling is a fictional drinks packer described here for illustrative purposes only. It depreciated its filling machines over fifteen years, a rate of about 6.7% a year, because that was the life written into a policy nobody had revisited in a decade.
In practice the machines were being replaced at around nine years, as line speeds and hygiene standards moved on. When one was retired with a carrying value of $260,000 and sold for $70,000, the accounts absorbed a $190,000 loss on disposal that had nothing to do with that year's trading.
Fenwick shortened the useful life to nine years, lifting the rate to roughly 11.1%, and applied the change from the current year forward. Annual depreciation rose and reported profit fell, but disposals stopped producing large one-off losses, and in this illustrative example the plant on the balance sheet finally matched what the equipment was worth.
Watch out
Common mistakes.
- Depreciating the full purchase price when the asset has a meaningful resale value, which overstates the annual charge and understates the carrying value.
- Treating the tax capital allowance rate as the accounting depreciation rate, when the two are set by different rules for different purposes.
- Leaving useful lives untouched for years, so assets stay on the books long after they have been replaced or scrapped in the real world.
Questions
People also ask.
Does land get a depreciation rate?
No, land is not depreciated because it is not considered to have a limited useful life, though buildings and site works on it are.
What happens if the rate turns out to be wrong?
The useful life is revised and the remaining carrying value is spread over the new remaining life, applied forward rather than by restating past years.
Does a higher depreciation rate mean less cash?
No, depreciation moves no cash at all, which is why it is added back when profit is converted into operating cash flow.
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