Section 179 and Bonus Depreciation: The Equipment Buying Decision, Tax-Optimized
The government is offering small business owners an interest-free loan every time they buy equipment — in the form of an accelerated depreciation deduction that lets you write off the full cost in year one instead of spreading it over five to seven years. Most owners know this vaguely. Very few model the actual tax impact before they sign the purchase order.
Section 179 and bonus depreciation are the two mechanisms that allow immediate expensing of business assets. They are frequently conflated, but they work differently, have different limits, and are strategically better in different circumstances. Getting the distinction right is the difference between a deduction that meaningfully reduces this year's tax bill and one that creates a carryforward you won't use for three years.
Here is how each one works, what the 2026 limits look like, and when to use which:
- Section 179 — the small business expensing election, with an income ceiling. Section 179 allows a business to deduct the full purchase price of qualifying equipment and software in the year it is placed in service, up to a 2026 limit of $1,220,000. The deduction phases out dollar-for-dollar when total equipment purchases exceed $3,050,000 in the year. The critical constraint: Section 179 cannot create or increase a net operating loss. If your taxable income before the deduction is $80,000, your Section 179 deduction is capped at $80,000 — any remaining amount carries forward to the next year. This income limitation makes Section 179 a poor tool for businesses in a loss year.
- Bonus depreciation — no income limitation, but the phase-down is real. Bonus depreciation under the TCJA allowed 100% first-year expensing through 2022. The phase-down schedule: 80% for property placed in service in 2023, 60% in 2024, 40% in 2025, 20% in 2026, 0% in 2027 and beyond (absent new legislation). Unlike Section 179, bonus depreciation has no income limitation — it can create or deepen a net operating loss, which then carries forward (or under certain pre-2018 rules, backward). For a business in a profitable year, the 20% bonus depreciation available in 2026 still produces a real immediate deduction on large purchases.
- The strategic sequence: use Section 179 first, bonus depreciation second. Section 179 is applied first and can be applied selectively to specific assets. Bonus depreciation is applied automatically to eligible property that wasn't taken under Section 179 (unless the taxpayer elects out). For a business with $200,000 of taxable income buying $300,000 of equipment, the optimal approach is to take $200,000 under Section 179 (using the full income), then apply 20% bonus depreciation to the remaining $100,000 ($20,000 deduction), minimizing any carryforward.
- Listed property rules add restrictions for vehicles and computers. Listed property — vehicles, computers, and other assets that can be used for personal purposes — faces additional limitations. Passenger automobiles are capped under the luxury auto limits ($12,400 standard Section 179 in 2026 for the first year on a regular passenger vehicle, adjusted annually). Computers used less than 50% for business are ineligible for Section 179 entirely. Mixed-use assets must demonstrate business use percentages, and if business use drops below 50% in a subsequent year, depreciation recapture applies.
- SUV and heavy vehicle exception — the so-called SUV loophole. Vehicles with a gross vehicle weight rating (GVWR) over 6,000 lbs are not subject to the luxury auto limits, which means they can qualify for full Section 179 expensing up to a specific annual SUV cap ($30,500 in 2026 for SUVs; no cap for vehicles over 14,000 lbs GVWR used for business). Many popular business vehicles — full-size trucks, large SUVs — exceed the 6,000 lb threshold. The deduction requires the vehicle to be used more than 50% for business, and documentation (mileage logs) is required to substantiate the business use percentage.
- The Section 179 trap — timing a large purchase can waste the deduction. Because Section 179 is limited by taxable income, a business that buys $500,000 of equipment in a year where net income is only $150,000 generates a $350,000 carryforward. That carryforward can be used in future years but earns no interest and provides no time-value benefit. The time to take Section 179 is in profitable years where the deduction will be absorbed. Buying equipment in a lean year and hoping Section 179 will help is often a carryforward, not a current-year tax reduction.
- Timing strategy — delay purchases to match the best deduction year. Equipment placed in service before December 31 qualifies for that year's deduction. Equipment purchased on December 30 that is operational by year-end qualifies. Equipment purchased and sitting in a warehouse without being placed in service does not. For businesses that can time their capex, pulling a purchase forward into a high-income year — or delaying it into one — can be worth five figures in immediate tax savings. This is a planning conversation to have in Q4, not after the purchase order is signed.
- State conformity varies significantly — check before assuming the federal deduction applies. Many states decouple from federal bonus depreciation — California, for example, does not allow bonus depreciation and has its own Section 179 limits that are lower than federal. A federal bonus depreciation deduction that reduces federal taxable income may have no effect on state taxable income, meaning the all-in tax savings is smaller than the federal deduction suggests. Any equipment-purchase analysis should run federal and state projections separately.
What it costs to ignore this analysis: depreciation schedules that spread deductions over five years when the full amount was available in year one, Section 179 carryforwards from poorly timed purchases, and a Q4 that passes without a planning conversation that could have saved real money.
We help business owners time equipment purchases, elect between Section 179 and bonus depreciation optimally, and model the state-level impact before the purchase is made rather than after.