What it means
When a business buys a major physical item, like a delivery van or office computers, that item will not last forever. It wears out and loses value over time.
Accounting rules require companies to match the cost of the item with the revenue it helps generate during each year of its life. This means you do not record the full cash outflow as an expense on the day of purchase.
Instead, you record a smaller depreciation expense annually. This practice matters immensely for non-finance managers because it directly impacts your reported profitability.
If you ignore depreciation, your profits will look artificially high in the year you buy equipment, and artificially low in subsequent years. Spreading the cost gives a true, accurate picture of your ongoing operational performance.
Depreciation also provides a vital tax shield. Because depreciation is treated as a business expense, it reduces your taxable income, meaning you pay less corporation tax.
While depreciation is a non-cash expense meaning no money actually leaves your bank account when you record it, it reduces the profit figure upon which tax is calculated. In daily practice, finance teams calculate depreciation using different methods.
The simplest is straight-line depreciation, which takes an equal amount off the value every year. Other methods account for heavier usage in early years.
Understanding this helps you budget for future replacements, as you can track how much asset value remains. Imagine buying a massive multi-pack of coffee pods for the office.
Even though you pay for them all today, you do not drink them all on day one. You consume them cup by cup over months, matching the consumption cost to the time you actually enjoy them.
In practice
Real-world examples
Example 1
A bakery purchases a commercial oven for $10,000. Instead of recording the whole amount as an expense immediately, the business spreads the cost evenly over its estimated 5-year useful life, giving $2,000 a year. After two years the oven sits on the balance sheet at $6,000.
Example 2
A digital marketing agency buys five high-end laptops for $2,000 each, a total of $10,000. The firm depreciates these computers over 3 years, recognising $3,333 of the cost as an expense each year. This keeps each year's profit fair, because the laptops help earn revenue in all three years.
Example 3
A logistics firm invests $50,000 in delivery bikes. The company tracks their reducing value annually over a 4-year period, expecting them to be worth $10,000 at the end. The annual charge is ($50,000 - $10,000) / 4 = $10,000, which matches the cost against delivery revenue year by year.
Think of it
Imagine buying a massive multi-pack of coffee pods for the office. Even though you pay for them all today, you do not drink them all on day one. You consume them cup by cup over months, matching the consumption cost to the time you actually enjoy them.
Formula
Calculation
Annual Depreciation = (Original Cost - Estimated Salvage Value) / Useful Life in Years. For example, if a machine costs $11,000, has a salvage value of $1,000, and lasts 5 years: ($11,000 - $1,000) / 5 = $2,000 depreciation per year.
Some assets lose value faster early on, so businesses may use the reducing balance method, which applies a fixed percentage to the remaining book value. Take a $10,000 machine depreciated at 20% a year. Year one is $10,000 x 20% = $2,000, leaving $8,000; year two is $8,000 x 20% = $1,600, leaving $6,400; year three is $6,400 x 20% = $1,280, leaving $5,120. Compare this with straight line, where a $10,000 machine with no salvage value over five years loses a flat $2,000 each year.Case study
Seen in the real world
This is a fictional, illustrative scenario. GreenLeaf Logistics, a small delivery firm, purchased a new electric delivery van for $30,000 at the start of the financial year. The business estimated the van would be useful for 5 years and have a salvage value of $5,000 at the end. Using straight-line depreciation, GreenLeaf calculated the annual expense as $30,000 minus $5,000, divided by 5 years, giving an annual depreciation expense of $5,000. When the finance manager prepared the annual profit and loss statement, they included this $5,000 depreciation charge.
This allowed GreenLeaf to match the cost of the van against the delivery revenue it earned that year. Consequently, the company reported a realistic profit instead of a one-off $30,000 hit in year one, and it lowered its taxable income by $5,000, resulting in meaningful tax savings. At an illustrative tax rate of 25%, that deduction saves $1,250 of tax each year. After the first year the van's net book value was $25,000, and it falls by $5,000 each year until it reaches the $5,000 salvage value. The finance manager used this schedule to plan the van's replacement, setting aside cash separately because depreciation itself does not build a replacement fund.
Watch out
Common mistakes
- Assuming depreciation means you need to set aside cash every year to replace the asset.
- Confusing the accounting depreciation value with the actual market value of the asset.
- Forgetting to subtract the estimated salvage value before calculating the annual expense.
Questions
People also ask
Does depreciation involve a cash outflow?
No. The cash leaves your bank account when you originally buy the asset. Depreciation is simply an accounting entry to spread that historical cost over time.
What happens when an asset is fully depreciated?
The asset remains on the balance sheet at its residual or salvage value, or at a nominal value of one pound, until it is sold, scrapped, or replaced.
Can I depreciate land?
No. Land does not wear out or have a limited useful life, so standard accounting rules do not permit land depreciation.