What Section 179 actually is
Section 179 of the Internal Revenue Code lets businesses deduct the full purchase price of qualifying equipment and software in the year it's placed in service, instead of spreading that deduction across several years of normal depreciation.
In plain English: buy a $100,000 CNC machine in 2026, put it in service before December 31, 2026, and — assuming you meet the other rules — deduct the full $100,000 on your 2026 tax return. Without Section 179, you'd deduct roughly $14,000–$20,000 per year across 5–7 years under MACRS depreciation.
The result is usually a substantial first-year tax reduction that improves cash flow for businesses making significant equipment investments. In a 25% federal bracket, that $100,000 deduction is worth $25,000 in reduced federal taxes — real money that can fund more growth.
2026 deduction limits
For tax years beginning in 2026:
| Metric | 2026 Amount | Notes |
|---|---|---|
| Maximum deduction | $2,560,000 | Up from $2,500,000 baseline after inflation adjustment |
| Phase-out starts at | $4,090,000 | Total qualifying property placed in service |
| Fully phased out at | $6,650,000 | Dollar-for-dollar reduction above phase-out |
| Heavy SUV cap | $32,000 | Separate lower cap for certain SUVs over 6,000 lbs GVWR |
| Bonus depreciation | 100% | Restored by OBBBA for property after January 19, 2025 |
These limits come from the One Big Beautiful Bill Act (OBBBA, signed July 4, 2025) which raised the baseline Section 179 cap to $2.5 million, plus the IRS's 2026 inflation adjustment published in Revenue Procedure 2025-32.
What equipment qualifies
Most tangible business property with a useful life of at least one year qualifies. Specifically:
- Machinery and equipment — manufacturing machinery, construction equipment, medical equipment, office equipment
- Vehicles — with specific rules for passenger autos vs. heavy trucks/SUVs (see below)
- Computers and technology — servers, networking gear, business laptops, tablets used primarily for business
- Off-the-shelf software — purchased (not custom-developed), readily available to the general public, non-exclusive license
- Office furniture — desks, chairs, file cabinets, conference tables
- Qualifying improvements to nonresidential real property — roofs, HVAC systems, fire protection, security systems, alarm systems
- Used equipment — fully eligible if "new to your business" and purchased from an unrelated party
What does NOT qualify
- Land and buildings (structural components)
- Inventory
- Property used for lodging (with exceptions)
- Property acquired from a related party
- Property used predominantly outside the United States
- Most intangible property (trademarks, customer lists, etc.)
Vehicle rules (where most people get tripped up)
Vehicles are the most common Section 179 confusion. The IRS splits them into categories based on Gross Vehicle Weight Rating (GVWR), which is stamped on the door sticker:
Under 6,000 lbs GVWR (passenger autos)
Standard luxury auto depreciation caps apply. For 2026, the first-year cap is typically limited (around $12,400 without bonus, about $20,400 with bonus depreciation). Section 179 does not override these caps.
6,000–14,000 lbs GVWR (heavy SUVs)
Section 179 limited to $32,000 for 2026 (up slightly from 2025). Additional cost can be expensed via 100% bonus depreciation. So a $75,000 heavy SUV used 100% for business: $32,000 Section 179 + $43,000 bonus depreciation = $75,000 first-year deduction.
Over 14,000 lbs GVWR or work vehicles
Full Section 179 eligibility up to the annual limit. Also includes vehicles with permanent work features (9+ passengers, cargo-only area at least 6 feet long, or a permanently-attached work compartment). Full expensing available.
Salespeople routinely sell luxury SUVs "for the tax write-off" without checking GVWR. A Mercedes GLE 350 is under 6,000 lbs GVWR and subject to the passenger auto caps. A Mercedes GLS 580 is over 6,000 lbs and eligible for the heavy-vehicle treatment. Verify the GVWR on the door sticker before purchase — not all marketing claims check out.
How Section 179 works with 100% bonus depreciation
The OBBBA restored 100% bonus depreciation for property acquired and placed in service after January 19, 2025. This matters because both deductions can be used together, but in a specific order.
The IRS requires this ordering:
- Apply Section 179 first — up to $2,560,000 in 2026, subject to the taxable income limitation
- Then apply bonus depreciation — 100% of remaining basis on eligible property
- Finally apply regular MACRS depreciation — if anything remains
Worked example
Construction company, $4.5M equipment year
Purchase: $4,500,000 in equipment placed in service in 2026.
Phase-out adjustment: $4,500,000 − $4,090,000 = $410,000 over threshold. Section 179 limit reduces dollar-for-dollar: $2,560,000 − $410,000 = $2,150,000.
Section 179 deduction: $2,150,000 (limited by phase-out).
Bonus depreciation on remaining basis: $4,500,000 − $2,150,000 = $2,350,000 × 100% = $2,350,000.
Total first-year deduction: $4,500,000 (100% of purchase).
Without bonus depreciation, that business could only deduct $2,150,000 in year one. With the combination, the entire $4.5M is deductible.
The taxable income limitation
Section 179 cannot create a net operating loss. The deduction is capped at your business's taxable income for the year (calculated without Section 179). Any excess Section 179 carries forward indefinitely.
Example: Your business has $150,000 in taxable income before Section 179. You bought $300,000 in equipment. You can deduct $150,000 of Section 179 this year; the remaining $150,000 carries forward to next year.
This is why bonus depreciation matters — it's not subject to the taxable income limitation and can create a loss. In practice, tax advisors often use Section 179 on equipment with longer useful lives and rely on bonus depreciation for shorter-lived assets.
How to claim it
Section 179 is elected by filing IRS Form 4562 (Depreciation and Amortization), Part I, with your business tax return. A few rules:
- Property must be "placed in service" by your tax year-end (December 31 for calendar-year taxpayers). Purchased-but-not-delivered equipment doesn't qualify.
- Business use must exceed 50%. If it drops below 50% in later years, you recapture a portion.
- Elected asset-by-asset. You choose which assets to expense under Section 179 and which to depreciate normally.
- Amendments allowed within specific windows. If you didn't claim Section 179 on a qualifying asset, you may be able to file an amended return.
Financing equipment while claiming Section 179
One of the most important details: you can claim Section 179 on financed equipment. You don't have to pay cash. This creates a powerful timing mismatch — you deduct the full cost in year one while only paying down principal over 3–7 years via loan payments.
Example cash flow impact
$100,000 equipment financing with Section 179
Financed amount: $100,000 at 10% over 5 years.
Monthly payment: approximately $2,125/month = $25,500/year.
Section 179 deduction (year 1): $100,000.
Federal tax savings at 25% bracket: $25,000.
Net year-1 cash outlay: $25,500 payments − $25,000 tax savings = $500 net.
The business acquired $100,000 of productive capital while the year-one net cash outlay approximates zero. This is why equipment financing combined with Section 179 is one of the most powerful tax-planning moves available to growing businesses.
Finance equipment while claiming Section 179
We match businesses with equipment financing terms that align with tax planning needs. Funded in as few as 3 business days.
State tax conformity
Federal Section 179 rules don't automatically apply at the state level. States fall into three categories:
- Full conformity states adopt federal Section 179 rules automatically. These include most states.
- Partial conformity states accept Section 179 but decouple from bonus depreciation. California is the biggest example — it caps Section 179 at $25,000 and doesn't allow bonus depreciation.
- Non-conformity states use their own depreciation rules entirely.
Before making a Section 179 decision, check your state's conformity status with your CPA. A federal deduction might not produce equivalent state savings.
Common mistakes to avoid
Placing orders late in the year
Equipment ordered in November but not delivered and installed until January misses the current-year deduction. If you're timing a purchase for tax purposes, ensure installation happens before December 31.
Insufficient business-use documentation
Vehicles especially trigger IRS scrutiny. Use a mileage tracking app (MileIQ, Everlance). Keep records showing >50% business use.
Claiming on real property
Buildings themselves don't qualify. Qualifying improvements (roofs, HVAC, fire protection) do. Know the difference before claiming.
Missing the taxable income limit
Small businesses with modest income sometimes claim Section 179 amounts they can't actually use. The carryforward is helpful but delays the benefit.
Ignoring state rules
Claiming full federal Section 179 in California and then discovering only $25,000 transfers to the state return is a painful surprise at tax time.