Depreciation and Section 179 for Small Business Owners: When to Expense vs. Depreciate

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When you buy equipment, a vehicle, or technology for your business, you generally can’t deduct the full cost in the year you purchased it. Depreciation spreads the deduction over the asset’s useful life. But Section 179 and bonus depreciation let you accelerate that deduction — sometimes taking the entire cost in year one. Knowing when to use each method is a significant tax planning lever.

Section 179: Full Expensing in Year One

Section 179 allows you to deduct the full purchase price of qualifying business assets in the year they’re placed in service. For 2026, the maximum deduction is $2.56 million, with a phase-out beginning when total asset purchases exceed $4.09 million. For most small businesses, those limits are well above what you’ll spend.

Qualifying assets include equipment, machinery, office furniture, computers, software, and certain vehicles. It also applies to qualified improvement property. The asset must be used for business more than 50% of the time.

Bonus Depreciation in 2026

Bonus depreciation has been phasing down since 2023. For assets placed in service in 2026, the bonus depreciation rate depends on the current legislative status under the OBBBA. Check with your tax preparer for the exact percentage applicable to your purchase, as this changed from the original TCJA phase-down schedule.

Unlike Section 179, bonus depreciation has no dollar cap and can create a net operating loss. Section 179 can only reduce your taxable income to zero — it can’t create a loss. That distinction matters for planning.

When Regular Depreciation Makes More Sense

Taking the full deduction in year one isn’t always the best strategy. If your income is low this year but expected to be higher in future years, spreading the deduction through regular depreciation preserves the tax benefit for years when it offsets higher-bracket income. If you’re already in a loss position, accelerating more deductions doesn’t help — it just creates a larger NOL that carries forward.

This is a tax planning decision, not a bookkeeping decision. The choice between Section 179, bonus depreciation, and regular depreciation should be made in the context of your overall tax position for the year — ideally before December 31, not in March when you’re preparing the return.

Vehicle Depreciation Rules

Vehicles have their own depreciation limits. Passenger vehicles are subject to annual caps under the luxury auto rules. For 2026, the first-year limit (with bonus depreciation) is significantly higher for vehicles over 6,000 pounds GVWR, which is why SUVs and trucks are popular business vehicle purchases. But the Section 179 deduction for SUVs is capped at $30,500 (indexed for inflation).

Documentation Requirements

Keep the purchase invoice, proof of payment, and documentation of the date the asset was placed in service. If it’s a vehicle, maintain a mileage log proving business-use percentage. The Section 179 election is made on your tax return — it’s not something you file separately. But once made, the election for a specific asset is generally irrevocable.

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If you’re planning a major equipment purchase and want to understand the tax impact before you buy, schedule a consultation or learn about our tax planning services.