What Is Depreciation and Why It Matters for Taxes

When you buy a business asset (equipment, vehicles, furniture, computers), the IRS does not let you deduct the full cost in the year you buy it. Instead, you spread the deduction over the asset's useful life. This is depreciation.

Depreciation reduces your taxable income each year, which means you pay less in taxes. For small business owners, understanding your depreciation options can save you thousands of dollars annually.

Depreciation Methods Explained

Straight-Line Depreciation

The simplest method. You deduct the same amount every year.

Annual Depreciation = (Asset Cost - Salvage Value) / Useful Life

A $10,000 machine with a $1,000 salvage value and a 5-year life depreciates at $1,800 per year. Predictable and easy to plan around.

Section 179 Deduction

Section 179 lets you deduct the full purchase price of qualifying assets in the year you buy them, up to the annual limit ($1,220,000 for 2024). This is a major tax benefit for small businesses.

Qualifying assets include:

• Equipment and machinery
• Vehicles (with limits for passenger vehicles)
• Computers and software
• Office furniture
• Certain building improvements

The catch: your total equipment purchases for the year cannot exceed $3,050,000, or the deduction starts to phase out.

MACRS (Modified Accelerated Cost Recovery System)

MACRS is the IRS default depreciation method for business assets. It front-loads deductions so you get larger write-offs in early years and smaller ones later.

Common MACRS recovery periods:

• 3-year: Tractor units, racehorses, certain manufacturing tools
• 5-year: Vehicles, computers, office equipment, appliances
• 7-year: Office furniture, agricultural structures
• 10-year: Water transportation equipment, some agricultural assets
• 15-year: Land improvements, certain retail improvements
• 20-year: Farm buildings, municipal sewers

Bonus Depreciation

Bonus depreciation allows you to deduct a large percentage of an asset's cost in the first year. For assets placed in service before 2027, the rate is being phased down:

• 2024: 60%
• 2025: 40%
• 2026: 20%
• 2027 and after: 0%

The remaining cost is then depreciated using MACRS over the asset's recovery period.

Which Method Should You Choose?

• Need the biggest tax break this year? Section 179 or bonus depreciation
• Want predictable deductions over time? Straight-line
• Default IRS method? MACRS
• Buying a vehicle? Check the annual vehicle deduction caps, as they limit all methods

Many small businesses combine Section 179 and bonus depreciation to maximize first-year deductions, then use MACRS for the remainder.

Tax Savings Estimate

The calculator multiplies your annual depreciation by your marginal tax rate to show estimated tax savings per year. If your depreciation is $10,000 and your tax rate is 25%, you save roughly $2,500 in taxes that year.

These savings are real dollars. Use them to plan cash flow, reinvest in the business, or pay down debt.

A Practical Example

You buy a $30,000 work truck. Using Section 179, you can deduct the full $30,000 this year (subject to vehicle limits). At a 24% tax rate, that saves you $7,200 in federal taxes right away.

Without Section 179, using MACRS over 5 years, your first-year deduction would be $6,000 (20% of $30,000), saving you $1,440 in year one.

The difference: $5,760 more in your pocket this year with Section 179.