Bonus Depreciation vs. Section 179: Which Is Better for You?

As a business owner or real estate investor, buying new equipment, machinery, or even making certain property improvements means a significant outlay of capital. The good news is that the IRS offers powerful deductions that allow you to recover these costs much faster than traditional depreciation.

The two primary tools for accelerating these deductions are Bonus Depreciation and Section 179 Expense Deduction. While both aim to incentivize investment by allowing immediate expensing, they have distinct rules, limitations, and optimal use cases. Understanding their differences is key to maximizing your tax savings.

What is Bonus Depreciation?

Bonus depreciation allows businesses to immediately deduct a large percentage of the cost of eligible property in the year it is placed in service, rather than depreciating it over many years. It was at 100% for several years but is currently phasing down.

• Eligibility: New or used tangible personal property (e.g., equipment, machinery, furniture), qualified improvement property (certain improvements to nonresidential real property), and certain software. Real estate (buildings) generally does not qualify, but components segregated from the building (like those identified in a cost segregation study) can.
• Phase-Down Schedule:
  • 80% for property placed in service in 2023
  • 60% for property placed in service in 2024
  • 40% for property placed in service in 2025
  • 20% for property placed in service in 2026
  • 0% for property placed in service in 2027 and beyond (unless Congress extends it).
• Key Feature: It applies per asset class, meaning you can take bonus depreciation on all eligible assets acquired in a given year. It can also create or increase a net operating loss (NOL) that can be carried forward or back.

What is Section 179 Expense Deduction?

Section 179 allows businesses to deduct the full purchase price of qualifying equipment and/or software purchased or financed during the tax year.

• Eligibility: Similar to bonus depreciation, it applies to new or used tangible personal property and off-the-shelf software. It also includes certain improvements to nonresidential real property (e.g., roofs, HVAC, fire protection, security systems).
• Dollar Limit: There is a maximum amount you can expense each year (e.g., $1,220,000 for 2025, projected).
• Phase-Out Threshold: The deduction begins to phase out dollar-for-dollar once the total amount of qualifying property placed in service during the year exceeds a certain limit (e.g., $3,050,000 for 2025, projected).
• Taxable Income Limit: You cannot use Section 179 to create a net operating loss. The deduction is limited to your business's taxable income. Any amount over this limit can be carried forward to future years.

Bonus Depreciation vs. Section 179: A Side-by-Side Comparison

Which One Is Better For You?

Often, you can use both! Many businesses use Section 179 first to reach their taxable income limit, and then apply bonus depreciation to any remaining eligible assets.

• Choose Section 179 if:
  • You want to expense improvements to real property (roofs, HVAC) that Bonus Depreciation might not cover (or only covers QIP).
  • You are close to your taxable income limit and want to avoid creating an NOL.
• Choose Bonus Depreciation if:
  • You have a large volume of eligible assets and exceed the Section 179 phase-out threshold.
  • You want to create or increase an NOL to offset past or future income.
  • You need to deduct more than the Section 179 dollar limit.

Conclusion: Plan Your Purchases Wisely

Both Bonus Depreciation and Section 179 are powerful incentives designed to encourage business investment. Strategic use of these deductions can significantly reduce your tax burden, improve cash flow, and help your business grow. Always consult with your tax advisor to determine the optimal strategy for your specific situation and property types, especially as bonus depreciation continues its phase-out.