Depreciation Explained: How the Business Tax Deduction Works

Depreciation is how the IRS lets you deduct the cost of a business asset that lasts more than a year, spreading the write-off across the years you use it instead of taking it all at once. A $10,000 desk or a work van does not come off your taxes the year you buy it the way a box of printer paper does. This guide walks how depreciation works for a sole proprietor or small business: what you can depreciate, how many years it takes, how the yearly number is figured, and when Section 179 or bonus depreciation let you deduct the whole thing up front. All of it lands on Form 4562 and flows to Schedule C.

What depreciation is

IRS Topic 704 defines depreciation as "an annual income tax deduction that allows you to recover the cost or other basis of certain property over the time you use the property." The word that matters is recover. You already spent the money; depreciation is the schedule on which the tax code gives that spending back to you as deductions.

The reason the IRS spreads it out is timing. A laptop or a trailer earns money for you across several years, so the tax code matches the deduction to those years rather than letting you write off a long-lived asset in a single year. Land is the permanent exception: because it does not wear out or get used up, Publication 946 and the Schedule C instructions both state that land is never depreciable, no matter how you use it.

What property you can depreciate

Property has to clear four tests before you can depreciate it. Topic 704 lists them plainly:

• You must own the property.
• It must be used in your business or an income-producing activity.
• It must have a determinable useful life.
• It must be expected to last more than one year.

Property that fails any test, or falls into an "excepted" category, is out. The main exclusions are land, inventory and stock in trade, property you place in service and dispose of in the same year, and Section 197 intangibles like goodwill (those get amortized instead, which is the amortization side of the same Form 4562).

The number you depreciate is the asset's basis, not just the sticker price. Publication 946 says the basis of property you buy "is its cost plus amounts you paid for items such as sales tax, freight charges, and installation and testing fees." A $9,400 machine with $400 in sales tax and $200 in freight has a $10,000 depreciable basis.

How many years: MACRS recovery periods

For almost anything placed in service after 1986, you use the Modified Accelerated Cost Recovery System, or MACRS. Its General Depreciation System sorts property into classes, and the class sets the recovery period. Publication 946 lists the asset examples; here are the ones a small business buys.

Two points trip people up. A computer is 5-year property while the desk it sits on is 7-year property, so a single office purchase can span two schedules. And if an asset has no class life the IRS assigned it, Publication 946 defaults it to the 7-year class, which is where a lot of odd equipment lands.

How the yearly number is figured

Two things decide each year's deduction: the method and the convention.

The method is how fast you write the asset down. MACRS gives 3-, 5-, 7-, and 10-year property the 200% declining balance method, which front-loads the deduction into the early years and then switches to straight line to finish. Land improvements and other 15- and 20-year property use 150% declining balance. Real property (buildings) uses straight line over its long life.

The convention decides how much you get in the first and last year. The default is the half-year convention: the IRS treats every asset as placed in service at the midpoint of the year, so you claim half a year of depreciation the first year regardless of the actual purchase month. Two variations override it. The mid-month convention applies to buildings. The mid-quarter convention kicks in when more than 40% of the year's asset basis is placed in service in the last three months, a trap for anyone who buys most of their equipment in a December spending push.

You do not compute the declining-balance math by hand. Publication 946 publishes the percentages in its Table A-1, and each year's deduction is the basis times that year's percentage. Here is $10,000 of office furniture (7-year property, half-year convention) run through the table:

Seven-year property takes eight calendar years to recover, because the half-year convention holds back part of the first year's deduction and pushes it out to the end. The percentages sum to 100%, so you recover the full basis and no more.

When you can skip the schedule

Most small owners rarely build an eight-year table, because three rules let you deduct a qualifying asset in the year you buy it.

• Section 179 lets you elect to expense the cost outright. For tax years beginning in 2025 the maximum is $2,500,000, and it phases out dollar for dollar once your total asset purchases pass $4,000,000. The deduction cannot exceed your business income, and it goes in Part I of Form 4562.
• Bonus depreciation is a first-year allowance that needs no income to use. Under the 2025 One Big Beautiful Bill guidance, it is 100% and permanent for qualified property acquired and placed in service after January 19, 2025, with a 40% election available. It sits in Part II.
• The de minimis safe harbor skips depreciation entirely for low-cost items, letting you expense them like any other supply.

MACRS over years is the default that these rules let you override, not a separate thing you choose. When Section 179 or bonus depreciation does not cover an asset, or you deliberately keep some depreciation for future years, the schedule above is what runs.

Common depreciation mistakes

The costliest error is deducting an asset's full cost as a regular expense when you have not elected Section 179 or bonus depreciation. The IRS can disallow the deduction and recharacterize it, and you lose the front-loaded years you were entitled to.

A few others show up every filing season:

• Depreciating land. Only the building depreciates. When you buy property, split the price between land and structure, because the land portion is not depreciable.
• Using the purchase date instead of the placed-in-service date. Publication 946 starts the clock when the asset is "ready and available for a specific use," which can be later than the day you paid.
• The Q4 buying push. Concentrate more than 40% of the year's purchases in the last quarter and the mid-quarter convention shrinks that year's deduction.
• Forgetting recapture. When you sell a depreciated asset for more than its written-down basis, the IRS taxes back the depreciation you claimed. That is depreciation recapture, and it is a bill many owners do not see coming.
• Vehicles used part-personal. A car is listed property. You depreciate only the business-use share, and you need records that prove the percentage.

How SparkReceipt fits

Depreciation is only as defensible as the records behind it, and the record that matters is the one that establishes basis. The IRS counts sales tax, freight, and installation toward the number you write off, so you want the full purchase receipt, not just the invoice total. SparkReceipt's tax receipt tracking captures each asset purchase with the vendor, date, tax, and line items, so the basis is documented the day you buy.

For vehicles and other listed property, the mileage tracker records the business-use share the IRS asks you to prove. And when your accountant builds the depreciation schedule, one-click expense reports hand them the asset purchases already categorized instead of a shoebox at year-end. Get Started with a plan that includes a seat for your accountant.

Frequently asked questions

Can I deduct the full cost of equipment in the first year? Often yes, through Section 179 or 100% bonus depreciation, as long as the asset qualifies. Without one of those elections, you recover the cost over the MACRS recovery period for the asset's class.

Is depreciation the same as Section 179? No. Depreciation over years is the default. Section 179 is an election you make to expense a qualifying asset up front instead. Both are reported on Form 4562, and both land on the same Schedule C line.

Do I have to depreciate, or can I just expense it? Small-dollar items can be expensed under the de minimis safe harbor rather than depreciated. Above that, a long-lived asset generally has to be capitalized and depreciated unless you elect Section 179 or bonus depreciation.

What happens to depreciation when I sell the asset? The IRS recaptures it. Gain up to the depreciation you claimed is taxed as ordinary income under the depreciation recapture rules, reported on Form 4797.

Where does depreciation go on my tax return? You figure it on Form 4562, and the total flows to Schedule C, line 13, "Depreciation and section 179 expense deduction." The Schedule C instructions tell you to attach Form 4562 whenever you depreciate property placed in service during the year.

Key takeaways

• Depreciation recovers the cost of a business asset that lasts more than a year, spread across the years you use it rather than deducted all at once.
• Four tests gate it: you own the asset, use it in business, it has a determinable useful life, and it lasts more than a year. Land does not qualify.
• The MACRS class sets the recovery period: 5 years for cars and computers, 7 for office furniture, 27.5 or 39 for buildings.
• Each year's deduction is the basis times a published percentage; the half-year convention stretches 7-year property across eight calendar years.
• Section 179 and 100% bonus depreciation let you deduct a qualifying asset the year you buy it, overriding the multi-year schedule.
• Keep the full purchase receipt, including sales tax and freight, because that is the basis your deduction and any future recapture are measured against.