A small printing shop in New York bought a commercial offset machine in January for $60,000. Cash went out the door once. The owner felt the hit, signed the paperwork, and got back to running jobs.
Twelve months later, his bookkeeper handed him the year-end P&L. Net profit was $48,000. The owner frowned. He had taken home far more than that. The bank balance agreed with him, not the report.
Then his bookkeeper pointed to a line halfway down the expense column.
Depreciation expense: $11,000.
No check was written for that $11,000. No vendor invoiced him. No money moved. Yet the accountant had reduced his reported profit by exactly that amount, and the tax authority would treat it as a real expense.
This is depreciation. And once a business owner understands it, financial statements stop feeling like a foreign language.
The core idea, in plain English
When a business buys a fixed asset, a delivery van, a server, a printing press, a coffee roaster, the matching principle in accounting says the cost should not hit the income statement all at once. Instead, the cost is spread across the years that the asset will help generate revenue.
That spreading is depreciation.
Three numbers drive every depreciation calculation:
| Term |
What it means |
| Cost |
Purchase price plus shipping, installation, and setup |
| Useful life |
How many years the asset will productively serve the business |
Salvage
value |
What the business expects to recover when the asset is retired |
The depreciable base is simply Cost minus Salvage Value. That figure gets allocated across the useful life.
One exception worth remembering: land is never depreciated. It has no finite useful life. The building sitting on it does; the land underneath does not.
Why it lowers profit but not cash
A printing press paid for in January shows up as a fixed asset on the balance sheet, not as an expense. Over the next five years, a slice of that cost is moved from the balance sheet to the income statement every period.
Two journal entries make it official:
- Debit: Depreciation Expense
- Credit: Accumulated Depreciation
The expense reduces net income. The credit hits a contra-asset account, accumulated depreciation, which sits on the balance sheet and quietly chips away at the asset's book value.
So profit drops. But because the cash already left the business months or years ago, no money moves on the day the entry is recorded. This is the reason a profitable business can hold healthy cash, and an unprofitable-looking one can still be solvent.
Five ways to slice the same cost
Different methods produce wildly different yearly numbers for the same asset. Take a $50,000 server with a five-year useful life and a $5,000 salvage value.
Straight-line method:
The simplest and most common.
Annual Depreciation = (Cost − Salvage Value) / Useful Life = ($50,000 − $5,000) / 5 = $9,000 per year
Steady, predictable, easy to budget.
Double-declining balance:
Front-loads the expense. Doubles the straight-line rate and applies it to the remaining book value each year.
| Year |
Depreciation expense |
| 1 |
$20,000 |
| 2 |
$12,000 |
| 3 |
$7,200 |
| 4 |
$4,320 |
| 5 |
$2,592 |
Useful for assets that lose value fast, like vehicles or computer equipment.
Sum-of-the-years' digits:
Another accelerated method. For a 5-year life, the denominator is 5+4+3+2+1 = 15. Year 1 gets 5/15 of the depreciable base, year 2 gets 4/15, and so on.
Units of production:
Tied to actual output, not time. If the server is expected to handle 1 million transactions across its life:
Depreciation per unit = $45,000 / 1,000,000 = $0.045
Process 300,000 transactions in year 1, and depreciation expense is $13,500. A slow year next year means a smaller charge.
MACRS (for US tax filings)
The Modified Accelerated Cost Recovery System is what the IRS requires for tax depreciation. It uses fixed schedules and ignores salvage value entirely. Tax depreciation and book depreciation can therefore look very different in the same year for the same asset.
The tax angle not talked about loudly
Depreciation is fully tax-deductible. A lot of founders miss this. By spreading the cost of a $60,000 machine across five years, the business gets to reduce taxable income every one of those years.
Choose an accelerated method, and the early-year tax savings climb sharply. Choose straight-line, and the savings stay steady. Either way, the same total expense is deducted across the asset's life. What changes is the timing, and timing is everything when cash flow is tight.
The one thing to track
Before signing off on any fixed asset purchase, ask the accountant two questions:
- What method will be used, and
- What does the depreciation schedule look like over the next five years?
That schedule reveals the real cost of the asset. Not the cheque written today, but the slow, silent expense that will pull at the bottom line every month for years.
A business that understands its depreciation schedule plans replacements early, prices its services accurately, and never confuses a healthy bank balance with a healthy profit margin.
