Depreciation Spreads a Cost
Why does a big purchase barely show up in this year's profit?
The idea
Depreciation allocates the cost of a long-lived asset across the years it is used, rather than the year it was bought.
In the real world
A £30,000 machine expected to last five years charges £6,000 a year to profit.
Going deeper
Buying an asset moves money out immediately and recognises the cost gradually, over the years the asset is used. That is why a large purchase can empty the bank account and barely move this year's profit.
It is the same timing gap that separates profit from cash, running in the opposite direction. Understanding it stops two common errors: treating a capital purchase as unaffordable because profit looks thin, and treating a profitable year as comfortable when the cash went out years ago on assets still being depreciated. Cash flow and profit are answering different questions and both are needed.
Where it stops applying
Depreciation schedules are accounting conventions, not measurements of wear. An asset can be fully depreciated and still working perfectly, or worthless well before its schedule ends.
Why it matters
It explains why a large purchase can leave the bank account empty and barely dent this year's profit.
Try this today
Find one asset on your books and check when the cash left versus when the cost appears.
Test yourself
A company buys a £30,000 machine outright. Cash falls £30,000 and profit falls £6,000. Where did the other £24,000 go?
Show the answer
Onto the balance sheet as an asset, to be charged against profit over the remaining four years. The cash left immediately; the cost is recognised as the machine is used. This is the same timing gap that makes profit and cash diverge.
Learn this in the feed Answering from memory, then again days later, is what makes it stick.