When a business buys a vehicle, equipment, or machinery, the tax code offers two powerful ways to deduct that cost quickly instead of spreading it over many years: Section 179 expensing and bonus depreciation. They often get lumped together, but the rules and strategic uses differ enough that picking the right one — or the right combination — can meaningfully change your tax bill.
What Section 179 Does
Section 179 lets a business deduct the full purchase price of qualifying equipment and vehicles in the year they’re placed in service, up to an annual dollar limit set by the IRS. It’s designed to encourage small and mid-sized businesses to invest in equipment by giving an immediate write-off instead of a multi-year depreciation schedule.
What Bonus Depreciation Does
Bonus depreciation also allows an immediate deduction for a percentage of an asset’s cost in the year it’s placed in service, and unlike Section 179, it isn’t limited to a fixed dollar cap tied to total equipment purchases for the year, making it useful for larger capital investments.
Key Differences Between the Two
Section 179 has an annual spending cap and phases out once total equipment purchases exceed a certain threshold, while bonus depreciation has no such spending limit. Section 179 also can’t create a net business loss, while bonus depreciation can push a business into a loss that carries forward to future years.
Vehicle Rules Are Different Than General Equipment
Vehicles are subject to special luxury auto depreciation limits unless they qualify as heavy vehicles — generally those with a gross vehicle weight rating over 6,000 pounds — which can use much larger Section 179 and bonus depreciation deductions than a typical passenger car.
Which Should You Use First?
Many businesses apply Section 179 first to the assets they choose, then apply bonus depreciation to remaining eligible costs. Because Section 179 offers more flexibility — you can choose which specific assets to expense — it’s often used strategically to manage taxable income precisely, while bonus depreciation applies more broadly.
Recapture Risk if Business Use Drops
If you deduct an asset heavily upfront and then reduce its business-use percentage below 50% in a later year, you may have to recapture part of the deduction as income. This makes it important to maintain consistent business use for assets you’ve expensed aggressively.
State Tax Treatment Can Differ
Not all states conform to federal Section 179 and bonus depreciation rules, so a large federal deduction doesn’t always translate to the same state tax benefit. Check your state’s specific rules or ask a tax professional familiar with your state.
Frequently Asked Questions
Can I use both Section 179 and bonus depreciation on the same asset? Yes — many businesses apply Section 179 first up to the asset’s cost or the annual limit, then apply bonus depreciation to any remaining basis.
Does buying a heavy SUV for business really get a bigger deduction? Yes, vehicles over the 6,000-pound gross vehicle weight threshold avoid the luxury auto depreciation caps that limit deductions on typical passenger cars, often allowing a much larger first-year write-off.
What happens if I don’t need the full deduction this year? Section 179 deductions you can’t use due to income limits carry forward to future years, while bonus depreciation can create a loss that also carries forward.
A tax professional can model both options against your specific income and equipment purchases, since the ideal strategy depends heavily on your business’s profit level and future plans for the assets.