Should You Buy or Lease Your Truck? The Tax Math That Decides
Section 179 and bonus depreciation let you deduct the full purchase price in year one. Here's how that changes the math for a $160,000 truck.
How much can you deduct if you buy a $160,000 truck this year?
The full $160,000 in year one, if you use Section 179 and bonus depreciation. That's not the standard five-year depreciation schedule. That's two IRS tools that let you front-load the entire deduction into the year you put the truck in service, which can save a capital-constrained owner-operator tens of thousands of dollars in federal tax the first year.
The baseline is straight-line depreciation over five years. A $160,000 truck gives you roughly $32,000 in deductions per year for five years under the standard MACRS schedule. Each year's deduction reduces your taxable income by that amount, which reduces what you owe in federal income tax.
But the IRS gives you two tools that do something very different.
What Section 179 and bonus depreciation actually do
Section 179 lets you expense the full cost of qualifying equipment in the year you buy it, up to a dollar limit. For 2026, that limit is $1,220,000. Bonus depreciation, which phases down to 40% in 2026 under current law, lets you deduct a percentage of the remaining cost after Section 179. Together, they let you deduct the entire purchase price in year one if the truck qualifies.
A Class 8 tractor qualifies. So does a trailer. So does most equipment you finance and put into service during the tax year.
The math: you buy a $160,000 truck in 2026. You take the full $160,000 under Section 179. Your taxable income drops by $160,000. If you're in the 24% federal bracket, that's $38,400 in federal tax you don't owe this year. If you're in the 22% bracket, it's $35,200.
That's cash you keep in the first year, instead of spreading the deduction across five years and waiting for the tax benefit to trickle in.
Why this matters more when you're buying, not leasing
When you lease, you deduct the lease payment each month as an operating expense. The deduction is immediate, but it's limited to the payment amount. You don't own the asset. You don't get depreciation. You don't get Section 179.
When you buy, you own the asset. You get the depreciation deduction. And if you use Section 179 and bonus depreciation, you get the entire deduction up front, which means you keep more cash in year one when cash flow is tightest.
The trade-off: buying requires a down payment, a loan, and the risk that the truck's resale value drops faster than you pay it off. Leasing requires no down payment, no loan, and no resale risk, but you never own the truck and you never get the big first-year deduction.
The tax math changes which option costs less over the life of the truck. If you can use the full Section 179 deduction in year one, and if your taxable income is high enough that the deduction saves you real money, buying can be cheaper than leasing even when the lease payment looks lower.
The income limit you need to know
Section 179 has a phase-out. If you buy more than $3,050,000 in equipment in a single year, the deduction starts to phase out dollar-for-dollar above that threshold. Most owner-operators and small fleets never hit that limit.
But Section 179 also requires taxable income. You can't deduct more than your net taxable income for the year. If you buy a $160,000 truck but only have $80,000 in taxable income, you can only deduct $80,000 under Section 179. The remaining $80,000 carries forward to the next year.
Bonus depreciation has no income limit. You can take it even if it creates a loss. But bonus depreciation phases down under current law: 40% in 2026, 20% in 2027, zero in 2028 unless Congress extends it.
So the full-deduction strategy works best when you have enough taxable income to absorb the Section 179 deduction in year one, and when you buy before bonus depreciation phases out completely.
What this means for your next truck purchase
If you're deciding whether to buy or lease in 2026, run the numbers with your CPA using your actual taxable income and your actual tax bracket. The illustrative $160,000 truck example shows the concept. Your real savings depend on your entity structure (sole proprietor, S-corp, LLC), your state's conformity with federal depreciation rules, and whether you have enough income to use the deduction.
Three questions to ask your accountant:
- How much taxable income will I have this year after operating expenses?
- Can I use the full Section 179 deduction, or will part of it carry forward?
- What's my effective tax rate (federal plus state plus self-employment tax if applicable), and how much cash does the first-year deduction actually save me?
If the answer to question three is $30,000 or more, and if you can finance the truck at a rate that doesn't eat up the tax savings, buying may cost less than leasing over five years. If the answer is $10,000 or less, or if you don't have the income to use the deduction this year, leasing may be cheaper.
The tax law is not general advice. The concepts are not obscure. The figures here are illustrative. Take them to your CPA and have the real conversation with your actual numbers. Not understanding this is costing real money if you're buying equipment outright without using the tools the IRS already gives you.
