You're staring at your trial balance. In real terms, the equipment account shows $50,000. In practice, it's been sitting there for two years. And you realize — you've never recorded depreciation. Not once And that's really what it comes down to..
Sound familiar? Happens more than you'd think.
Depreciation isn't just a tax thing. And it's definitely not something you "get to later.In real terms, every period. It's not optional. So naturally, " If you're running a business and using equipment to make money, you need to record depreciation. Correctly.
Let's walk through exactly how to do that — the journal entry, the methods, the mistakes people make, and the details that actually matter.
What Is a Depreciation Journal Entry
At its core, a depreciation journal entry moves cost from the balance sheet to the income statement. Practically speaking, you're saying: "This asset helped us earn revenue this period. Here's its share of the cost.
The entry always looks like this:
Debit: Depreciation Expense
Credit: Accumulated Depreciation
That's it. Two accounts. Every time.
Depreciation Expense hits the income statement. It reduces net income. Accumulated Depreciation is a contra-asset account — it sits on the balance sheet right under the equipment, reducing its book value. Worth adding: you never credit the Equipment account directly. Ever. That's rule number one.
The accounts involved
- Equipment (or Machinery, Vehicles, Furniture, etc.) — the original cost stays here forever unless you sell or scrap the asset
- Accumulated Depreciation — grows over time, never resets unless the asset is disposed of
- Depreciation Expense — resets to zero each year when you close the books
Simple structure. But the amount you debit and credit? That's where the work lives.
Why It Matters / Why People Care
Skip depreciation for a year and your financial statements lie. Also, net income looks better than reality. Assets are overstated. Expenses are understated. That might feel good in December — but it catches up.
For taxes
The IRS requires depreciation (or Section 179 / bonus depreciation elections) for business assets. If you don't claim it, you can't just "catch up later" without filing amended returns. And if you're audited? Missing depreciation is a red flag.
For lenders and investors
Banks look at fixed asset turnover. That's why if your equipment is $200K and accumulated depreciation is $15K after five years — they know something's off. Even so, they check accumulated depreciation as a percentage of gross equipment. Either you're not recording it, or you're using weirdly long useful lives Turns out it matters..
For you
Accurate depreciation tells you the real cost of running your business. It helps with pricing, replacement planning, and knowing when an asset is truly "paid for" in economic terms.
How It Works (or How to Do It)
You need three numbers before you make the entry:
- Cost — purchase price + sales tax + shipping + installation + any cost to get it ready for use
- Useful life — how long you expect to use it in your business (not the manufacturer's estimate)
- Salvage value — what you think you'll get when you sell or scrap it at the end
Straight-line method (most common)
Formula:
(Cost − Salvage Value) ÷ Useful Life = Annual Depreciation
Example:
You buy a $30,000 delivery van. Expect to use it 5 years. Think you'll sell it for $5,000 Simple, but easy to overlook..
($30,000 − $5,000) ÷ 5 = $5,000 per year
Monthly entry (if you close monthly):
Debit Depreciation Expense — Vehicles: $416.67
Credit Accumulated Depreciation — Vehicles: $416.67
Do this every month. Same amount. Predictable. Easy to explain.
Declining balance (accelerated)
Double-declining balance (DDB) is the most common accelerated method. You take 2 ÷ useful life as your rate, apply it to book value (not cost) each year But it adds up..
Same van. 5-year life. Rate = 2 ÷ 5 = 40% Simple, but easy to overlook..
Year 1: $30,000 × 40% = $12,000
Year 2: ($30,000 − $12,000) × 40% = $7,200
Year 3: ($18,000 − $7,200) × 40% = $4,320
...and so on, until you hit salvage value That's the part that actually makes a difference. Still holds up..
Important: You never depreciate below salvage value. Switch to straight-line in the final year if needed.
Units of production
Only makes sense if usage varies wildly year to year — like a machine that runs 2,000 hours one year and 500 the next.
Formula:
(Cost − Salvage) ÷ Total Estimated Units = Rate per Unit
Then multiply by actual units each period.
Honestly? Most small businesses skip this. It's more tracking than it's worth unless you're in heavy manufacturing.
Monthly vs. annual entries
If you close monthly — record it monthly. Now, don't wait until year-end and dump 12 months in one entry. That distorts monthly financials and makes your accountant sigh.
Set up a recurring journal entry in your accounting software. Most systems (QuickBooks, Xero, NetSuite) let you memorize it. Even so, do it once. Forget it.
Partial-year depreciation
Bought the van in July? You have two main options:
- Half-year convention — take 6 months in year 1, 6 months in final year (common for tax)
- Actual months — depreciate for months in service (July–Dec = 6 months)
GAAP allows either if applied consistently. Plus, tax usually requires half-year or mid-quarter convention. Pick one. Document it. Stay consistent.
Common Mistakes / What Most People Get Wrong
Crediting the Equipment account
This is the big one. In practice, people see "decrease asset" and credit Equipment. Wrong. Equipment stays at historical cost. Always. The offset is Accumulated Depreciation — a separate line item on the balance sheet.
If you credit Equipment, you lose the original cost. You mess up fixed asset registers. In real terms, you can't calculate gain/loss on sale. Don't do it But it adds up..
Forgetting to start depreciation in the right month
Asset placed in service March 15. That's three months missing. The IRS calls this a "depreciation error" — and it's a method change to fix (Form 3115). But first entry recorded June. Painful That's the part that actually makes a difference..
Using tax depreciation for books
Section 179. In practice, bonus depreciation. MACRS. Great for taxes. Terrible for financial statements if you're showing them to anyone outside the business Turns out it matters..
Book depreciation should reflect economic reality. Tax depreciation reflects Congress's incentives. They're different. Keep two schedules.
—it's just disciplined recordkeeping. Even so, a simple spreadsheet with two columns (book vs. tax) prevents the awkward conversation when a lender asks why your net income on the financials is $40K but your tax return shows a loss And it works..
Not reconciling the fixed asset ledger
Your software says Accumulated Depreciation is $58,200. Consider this: your general ledger says $55,900. And nobody notices for three years. Then you sell the asset and the gain/loss is off by $2,300 with no paper trail.
Reconcile the fixed asset subledger to the GL every quarter. It takes ten minutes. It saves you from reconstructing three years of entries during an audit.
Ignoring disposals
The printer died in 2022. Because of that, you threw it out. But you kept depreciating it through 2024 because nobody recorded the disposal. Now your balance sheet carries a ghost asset and phantom depreciation expense.
When an asset leaves — sold, scrapped, stolen, traded — record it that period. Book any gain or loss. Remove both the gross cost and the accumulated depreciation. Clean close.
Why This Actually Matters
Depreciation isn't busywork. It's the mechanism that matches the cost of a long-lived asset to the periods that benefit from it. Skip it and your early years look artificially profitable while later years get hammered. In real terms, lenders, investors, and buyers all look at your fixed asset schedule. A clean, consistent depreciation policy signals that you know what you're doing.
For tax, getting it wrong means amended returns, penalties, or leaving deductions on the table. For books, getting it wrong means financials nobody can trust Turns out it matters..
Conclusion
Depreciation is fundamentally simple: pick a method that fits the asset, depreciate from cost down to salvage, credit Accumulated Depreciation never the asset itself, and keep your books and tax schedules separate. In real terms, record it on the right schedule, reconcile quarterly, and dispose of assets the moment they leave. Do those things consistently and depreciation stops being a source of errors and becomes just another routine entry you never have to think about Not complicated — just consistent. But it adds up..
