Section 179 Equipment Deduction

Section 179 lets you deduct the full purchase price of qualifying equipment in the year you put it to work, instead of spreading depreciation over five or seven years. And yes, it applies to equipment you financed. That single fact is why December is the busiest month in the equipment business.

This guide covers what the deduction is, the 2026 numbers, how financing and leasing change the treatment, and a worked example. One thing up front: this is general information, not tax advice. Run everything past your tax professional before you buy on the strength of a deduction.

What Section 179 actually does

Normally, when a business buys a truck or a piece of construction equipment, the IRS makes you depreciate it. You recover the cost a slice at a time over the asset’s scheduled life. Section 179 is the exception. It lets you elect to expense the entire cost, up to the annual limit, in the year the equipment is placed in service.

“Placed in service” matters. The machine has to be purchased and ready for use by December 31 of the tax year. A signed purchase order in December with delivery in January counts for January’s year, not the one you wanted.

The practical effect: a big year-one deduction lowers your taxable income, so the effective cost of the equipment drops by your tax rate.

The 2026 numbers

For 2026, the maximum Section 179 deduction is $1,220,000. That is the figure our calculator uses when it estimates your savings. It covers a single semi truck, a fleet of box trucks, or a serious excavator without breaking a sweat.

A few things to know about the limit:

The cap applies to your total qualifying purchases for the year, not per machine.
Above a much higher spending threshold, the deduction starts to phase out dollar for dollar. Most small fleets never get near it, but if you are buying several million dollars of equipment in one year, your tax pro needs to run that math.
The deduction generally cannot exceed your taxable business income for the year. Section 179 can shrink your tax bill to zero, but it usually cannot create a loss to offset other income. Excess amounts can often carry forward.

Rules and dollar figures change. Confirm the current limits with a tax professional before you count on them.

Financing vs leasing: how the structure changes the deduction

Here is where people get tripped up. The tax treatment follows who owns the equipment, and different financing structures answer that question differently.

Loans and $1 buyout leases

With an equipment loan, you own the machine from day one, even though the lender has a lien on it. The IRS treats you as the owner, so the full purchase price is generally eligible for Section 179 in year one. A $1 buyout lease works the same way in practice because it is a capital lease: a loan wearing a lease costume.

This creates the famous Section 179 quirk. You can finance a truck, put almost nothing down, deduct the entire price in year one, and the tax savings can exceed your first year of payments. You come out cash-flow positive on paper before the truck has finished its first quarter of work.

Operating-style leases

With an FMV lease, the lessor owns the equipment and you are renting it. You generally do not take Section 179. Instead, each lease payment is typically deductible as an operating expense. TRAC leases, the common structure for vehicles over 10,000 pounds, usually work this way too: payments deducted as you make them, not one big year-one deduction.

Neither treatment is automatically better. Year-one expensing helps most in a big income year. Deducting payments spreads the benefit out, which suits steady income. This is a call your accountant should make with your books in front of them.

A worked example

Say you buy a used semi truck for $180,000 and finance it. Your combined federal and state tax rate is 24%.

The calculator’s Section 179 estimate works like this: it takes the equipment price, caps it at $1,220,000, and multiplies by your tax rate. Your $180,000 truck is well under the cap, so the full price counts:

Deduction: $180,000
Tax savings: $180,000 x 24% = $43,200

That $43,200 is real money back against your tax bill in the year the truck goes to work. If you financed with a small down payment, the year-one tax savings may be several times what you have actually paid the lender so far.

Now the caveats, because there are always caveats. You need at least $180,000 of taxable business income to absorb the full deduction in one year. The truck must be used for business more than half the time. And your state may not follow the federal rules, which can change the combined savings. A tax professional will sort all three in about ten minutes.

What qualifies

Most tangible business equipment qualifies: trucks, trailers, construction equipment, and the machinery our equipment financing pages cover. The common thread is that it must be tangible, bought for business use, and placed in service in the tax year you claim it. Real estate and land do not count, and mixed-use machines only count for the business share.

Run the numbers, then call your accountant

The fastest way to see what Section 179 is worth to you is to plug your equipment price and tax rate into the fleet funding calculator. The results include an estimated Section 179 savings line next to your payment, so you can weigh the deduction against the financing cost in one view.

Then take that printout to your tax professional. Limits shift, states differ, and your income picture decides how much of the deduction you can actually use this year. The calculator gives you the number to start the conversation; your accountant confirms it ends the way you hoped.