Depreciation Explained: A Simple Guide for Business Owners

You buy a $60,000 machine for the business. Common sense says "that's a $60,000 expense." The tax code says "maybe — over one year, or five, or thirty-nine, depending on choices you make on the return." That's depreciation, and in 2026 the news is genuinely good: with 100% bonus depreciation now permanent, most equipment can be written off in full the year it goes to work. Here's the whole system in plain English — what depreciation is, the three ways to take it, and how to pick.

What is depreciation in plain English?

When you buy something for the business that lasts more than a year — equipment, vehicles, furniture, buildings — you generally can't deduct it like rent or supplies. Instead, you deduct the cost over the asset's assigned life, matching the expense to the years the asset earns its keep. Land never depreciates; buildings do; and the cheap stuff escapes the system entirely — under the de minimis safe harbor, items costing up to $2,500 each (with the right accounting policy) can generally be expensed immediately, no depreciation schedule required. So the $900 laptop is just an expense; the $60,000 machine gets a strategy.

What are the three ways to write off an asset?

Every business asset takes one (or a blend) of three paths:

1. Regular MACRS depreciation — the default schedule. Each asset type has an assigned life: computers and most equipment 5 years, office furniture 7 years, land improvements 15 years, residential rentals 27.5 years, commercial buildings 39 years. Deductions follow a front-loaded formula across those years.
2. Section 179 expensing — an election to deduct qualifying assets immediately, up to $2,560,000 for 2026 (the benefit phases out dollar-for-dollar once total purchases exceed $4,090,000 — a ceiling most small businesses never approach).
3. Bonus depreciation — a 100% first-year write-off for qualifying property with a life of 20 years or less. The 2025 tax law made this permanent for property acquired after January 19, 2025 — no more phase-down countdown. New and used equipment both qualify (used works if it's new to you, bought at arm's length).

Since both §179 and bonus reach 100% in 2026, the practical question isn't "how much" — it's which tool, and occasionally whether instant is even what you want.

Section 179 vs. bonus depreciation — what's the real difference?

They look identical from a distance ("write it all off now") and behave differently up close:

Three of those rows decide most real cases. Income limits: §179 can't take taxable income below zero, while bonus can create a loss — useful if a loss is the plan, wasteful if it strands deductions. Precision: §179 lets you expense exactly the assets and amounts you choose; bonus applies to every asset in a class once elected (technically, you elect out by class). States: many states don't honor bonus depreciation, so your state return may add income back — a genuine surprise for first-timers.

What about vehicles and buildings?

Vehicles are depreciation with guardrails. Regular passenger vehicles face annual "luxury auto" caps — for 2026, a maximum of $20,300 of first-year depreciation when bonus applies ($12,300 without). Heavier vehicles over 6,000 lbs GVWR escape those caps: §179 allows up to $32,000 on heavy SUVs for 2026, and bonus depreciation can generally take the rest — which is why the truck ads get loud every December. Business-use percentage matters everywhere: drop to 50% or less business use and accelerated deductions get recaptured.

Buildings move slowly (27.5 or 39 years) — but pieces of them don't. Qualified improvement property (most interior improvements to commercial space) has a 15-year life, making it bonus-eligible, and a cost segregation study can carve a purchased building into 5-, 7-, and 15-year components with meaningful first-year deductions. That's specialist territory, but knowing it exists is how owners think to ask.

What happens when you sell a depreciated asset?

The deduction isn't free forever — depreciation reduces your basis, and when you sell, prior depreciation generally comes back as ordinary income ("recapture"). Write a machine down to zero, sell it for $20,000, and that $20,000 is generally taxable — often at ordinary rates, not capital gains. This is also why "the whole business shows a loss because I wrote everything off" needs planning context: today's deduction is partly a timing trade, and exit-year surprises are the classic version of learning that late.

How do the numbers actually compare?

Hedged illustrations — brackets and states change everything, so treat these as shape, not gospel. A profitable S corp buys a $60,000 machine (5-year property) in 2026:

• Regular MACRS: roughly $12,000 deducted in year one (20% first-year table), the rest across the next five — at a 24% bracket, about $2,880 of first-year tax saved, with the remainder arriving over time.
• §179 or bonus: the full $60,000 in year one — roughly $14,400 of federal tax saved now instead of over six years. Same total deduction either way; the difference is purely when, and money now funds payroll and inventory.
• The wrinkle: if 2026 is already a loss year, §179 is unusable this year (it carries forward), bonus just deepens an NOL that only offsets 80% of future income, and straight MACRS might genuinely be the better play — saving deductions for profitable years at higher brackets.

That last bullet is the whole reason depreciation is a decision rather than a checkbox. If your fixed-asset list currently lives in a shoebox — or your books show equipment purchases sitting in "office expense" — that's a solvable cleanup, and it directly changes your tax bill. Problems come here to get solved. Our bookkeeping team maintains the asset schedule as part of monthly service, and our advisory side runs the §179-vs-bonus math before year-end, not after. The rest of this year's rule changes live in the 2026 tax changes hub.

FAQ

Do I have to depreciate, or can I just skip it?

Skipping it doesn't help — the tax code reduces your basis by the depreciation you were allowed to take, whether or not you took it. You'd face recapture on deductions you never enjoyed. If prior years were missed, a catch-up filing (Form 3115) can generally recover them.

Does used equipment qualify for bonus depreciation?

Generally yes — used property qualifies if it's new to you, acquired from an unrelated party after January 19, 2025. That made bonus depreciation dramatically more useful for small businesses buying second-hand machinery and vehicles.

Can I write off a financed purchase I haven't paid for?

Yes — depreciation follows placed in service, not paid off. Finance a $60,000 machine in December 2026 with $5,000 down, and the full $60,000 is generally eligible for 2026 write-off while you repay over years. (The interest is deductible separately as you pay it.)

What does "placed in service" actually mean at year-end?

Ready and available for use in the business — not ordered, not in transit, not in a crate. For a December 2026 deduction, the asset generally needs to be installed and usable by December 31. Delivery trucks arriving January 3 belong to 2027.

What records do I need to keep?

Purchase documents (invoice, date, cost), placed-in-service date, business-use percentage for anything with personal crossover (especially vehicles — keep a mileage log), and a running fixed-asset schedule showing accumulated depreciation. Your future self needs that schedule the day you sell anything.

Reviewed by the WAYG tax team · Updated July 2026