Section 179 and Bonus Depreciation: How to Deduct Equipment and Vehicles in Year One

The basic idea: deduct it now instead of over 5–7 years

When a business buys equipment, software, or a vehicle, the default IRS treatment is to capitalize the cost and depreciate it over the asset’s useful life — typically 5 years for equipment and software, 7 years for some assets. That means a $50,000 equipment purchase becomes roughly $10,000/year in deductions rather than a $50,000 deduction in year one.

Section 179 and bonus depreciation both let businesses accelerate that deduction — taking all or most of it in the year of purchase. For a profitable business at a 32% combined federal and state rate, accelerating a $50,000 deduction saves $16,000 in taxes immediately rather than over five years.

Deducting $50,000 now rather than $10,000/year for five years saves real money: $16,000 in tax savings today instead of $3,200/year. Time value plus cash flow.

Section 179: the election to expense up to $1.16M

Section 179 is an election (you choose it; it’s not automatic) that lets you immediately deduct the full cost of qualifying property in the year placed in service, up to the annual dollar limit.

2025 limits:

• Maximum deduction: $1,160,000
• Phase-out begins at: $2,890,000 in total property placed in service
• Phase-out is dollar-for-dollar above the threshold (at $4,050,000 in purchases, no Section 179 is available)
• Deduction is limited to taxable income — cannot create a loss

Qualifying property under Section 179

Section 179 covers most tangible personal property used in a trade or business:

• Equipment, machinery, and tools
• Computers and off-the-shelf software
• Office furniture and fixtures
• Business vehicles (subject to limits — see below)
• Qualified improvement property (interior renovations to non-residential real property)

Real property (buildings, land) doesn’t qualify for Section 179, with the exception of qualified improvement property for certain leasehold improvements.

Bonus depreciation: separate, can exceed income

Bonus depreciation is different from Section 179 in key ways. It’s automatic (applies unless you elect out), applies after Section 179, and can create a net operating loss.

Bonus depreciation rates by year:

Whether Congress extends bonus depreciation is uncertain. If you’re planning large equipment purchases, the decision between 2025 and 2026 could be material.

Vehicle deductions: where it gets complicated

Vehicles have special rules because of the mixed-use potential and historical abuse. The rules depend on the vehicle’s gross vehicle weight rating (GVWR):

California conformity: a separate calculation

California does not conform to federal Section 179 limits above $25,000 (California’s own limit) or to federal bonus depreciation. This means:

• Federal: you deduct $100,000 of equipment cost in year one
• California: you deduct $25,000 in year one and depreciate the remaining $75,000 over 5 years
• Result: you have different depreciation schedules for federal vs. California returns — a common source of complexity in California business returns

Your CPA tracks these differences using a depreciation schedule that reconciles federal and California treatment. The deferred California deductions don’t disappear — you take them over the asset’s life. But the federal benefit is immediate; the California benefit is spread out.

When Section 179 and bonus depreciation are most valuable

These deductions matter most when:

• You’re having a high-income year and want to bring taxable income down before year-end
• You were planning to buy the equipment anyway — accelerating the purchase into December creates the deduction in the current year
• You’re trying to stay under a key threshold (QBI phase-out, NIIT, AMT)
• You want to offset a large capital gain from another transaction

The flip side: if your income is unusually low this year and you expect a much higher income next year, deferring the purchase into next year may produce a larger tax benefit.