After purchasing equipment, vehicles, or machinery, business owners always ask:
“Can I write this off this year?”
Usually the answer is yes, but the method of depends on your situation.
Two major tax provisions allow businesses to deduct the cost of assets much faster than traditional depreciation:
- Section 179
- Bonus depreciation
The One Big Beautiful Bill Act (OBBBA) restored 100% bonus depreciation permanently for qualifying property placed in service after January 19, 2025.
Both deductions allow the same thing: a large first-year write-off. But the rules, limitations, and planning strategies are very different.
This guide explains:
- The key differences between Section 179 and bonus depreciation
- When each strategy makes sense
- Common limitations
- Practical examples for business owners
How Accelerated Depreciation Works
Tax Code Reference: IRC §168 — Accelerated Cost Recovery System
Under normal tax rules, most business equipment must be depreciated over several years using the Modified Accelerated Cost Recovery System (MACRS).
For example:
Asset Standard Recovery Period
- Machinery – 7 years
- Office Furniture – 7 years
- Computers – 7 years
- Vehicles – 5 years
Instead of deducting the full cost immediately, the IRS wants you to spread the deduction over multiple years.
However, Section 179 and bonus depreciation allow businesses to accelerate those deductions—sometimes entirely into the first year.
What Is Section 179?
Tax Code Reference: IRC §179 — Election to expense certain depreciable business assets
Section 179 allows businesses to expense the cost of qualifying equipment in the year it is placed in service rather than depreciating it over time.
2026 Section 179 Limits
For 2026 (indexed annually for inflation), the deduction is expected to be approximately:
- Maximum deduction: about $1,250,000
- Phase-out threshold: about $3,130,000
Businesses can expense equipment purchases up to the deduction limit and the deduction begins phasing out dollar-for-dollar once purchases exceed the threshold.
This means that Section 179 allows you to elect to deduct equipment purchases immediately—but only up to certain limits.
Example: Section 179 Deduction
A construction company purchases:
- Equipment: $150,000
- Business income: $250,000
The business can elect Section 179 to deduct the entire $150,000 in the current year.
What Is Bonus Depreciation?
Tax Code Reference: IRC §168(k) — Special allowance for certain property
Bonus depreciation allows businesses to deduct a percentage of an asset’s cost immediately after it is placed in service.
Under the One Big Beautiful Bill Act, bonus depreciation was permanently restored to 100% for qualifying property placed in service after January 19, 2025.
This means businesses may deduct 100% of the cost of eligible assets in the first year, with no annual deduction cap.
Example: Bonus Depreciation
A company purchases machinery worth $2,000,000.
Even if Section 179 limits are exceeded, 100% bonus depreciation may still allow the entire cost to be deducted in the same year.
Key Differences Between Section 179 and Bonus Depreciation
Although both provisions accelerate deductions, they behave very differently.
Section 179
- Has maximum deduction cap
- Cannot exceed taxable income
- Begins phasing out when purchase exceeds threshold
- Election is optional and flexible
- Applies asset-by-asset
Bonus Depreciation
- No maximum deduction cap
- No income limitation
- No phase-out
- Election is automatic unless elected out
- Applies to all assets
Why This Matters
Section 179 gives businesses precision control, while bonus depreciation often operates automatically.
When Section 179 Makes More Sense
Section 179 is a better choice when a business wants more control over how deductions are applied.
Situations Where Section 179 Works Well
- The business wants to limit deductions to avoid creating a loss
- Only certain assets should be expensed
- The business expects higher income in future years
Example
A company purchases $300,000 of equipment but only wants to deduct $120,000 this year.
Section 179 allows the business to choose the deduction amount.
When Bonus Depreciation May Be Better
Bonus depreciation is often advantageous when businesses need large deductions immediately.
Situations Where Bonus Depreciation Works Well
- The business purchased large amounts of equipment
- The Section 179 phase-out threshold has been exceeded
- The business wants to create or increase a tax loss
Unlike Section 179, bonus depreciation is not limited by taxable income.
Important Limitations to Understand
Even with generous deductions available, there are several restrictions.
Business Use Requirements
Tax Code Reference: IRC §280F — Limitation where certain property used for personal purposes
To qualify for accelerated depreciation, the asset must be used more than 50% for business purposes.
If business use falls below this level later, Section 179 deductions may be recaptured.
Vehicle-Specific Limits
Passenger vehicles are subject to additional depreciation limits.
Even with bonus depreciation restored, most vehicles under 6,000 pounds GVWR remain subject to annual deduction caps.
Learn more about the depreciation limits for business vehicles.
Qualified Property Requirements
Reference: Treas. Reg. §1.168(k)-2(b) — Qualified Property
To qualify for Section 179 or bonus depreciation, property must generally be:
- Tangible business property
- Used in an active trade or business
- Placed in service during the tax year
Section 179 and bonus depreciation are not mutually exclusive.
In fact, they often work together in a strategic order:
- Apply Section 179 first
- Apply bonus depreciation to remaining basis
- Apply MACRS depreciation to any remaining balance
This layered approach often maximizes flexibility.
Practical Example: Combining Both Deductions
A manufacturing company purchases $800,000 of equipment.
Possible strategy:
- Section 179 deduction: $400,000
- Bonus depreciation: $400,000
- Total first-year deduction: $800,000
But another business might choose to limit Section 179 and defer some deductions depending on its tax situation.
Common Mistakes Business Owners Make
- Assuming every asset should be fully expensed
- Sometimes spreading deductions across future years produces a better tax outcome.
- Ignoring the taxable income limitation for Section 179
- If a business has low taxable income, Section 179 may be limited.
- Forgetting bonus depreciation applies automatically
Unless you elect out, bonus depreciation applies to all qualifying property within the asset class.
How to Decide Which Deduction to Use
Before purchasing equipment, consider these planning questions:
- What is your expected taxable income this year?
- Will the deduction create a net operating loss?
- Do you expect higher income in future years?
- Are you approaching the Section 179 phase-out threshold?
- Does the deduction align with your long-term tax strategy?
These questions often determine whether Section 179, bonus depreciation, or a combination of both produces the best result.
Next Steps for Business Owners
If you are planning to purchase equipment, vehicles, or machinery in 2026:
- Estimate the cost of the asset
- Confirm it qualifies under Section 179 or bonus depreciation
- Evaluate the business income limitation
- Model different deduction strategies
- Coordinate the deduction with your broader tax planning
The goal isn’t simply to take the largest deduction possible—it’s to take the right deduction at the right time.
Need Help Planning Equipment Purchases?
At Pineda Bookkeeping & Tax Services, we help business owners evaluate major purchases before they happen so the tax strategy supports the business—not the other way around.
We help clients:
- Project tax savings from equipment purchases
- Evaluate Section 179 vs bonus depreciation
- Plan purchases around cash flow and tax strategy
- Ensure deductions are fully compliant with IRS rules
Because when it comes to tax planning, the most valuable deductions are the ones planned ahead of time.
