Buying a Truck or Equipment Before December 31? Read This First.

Every December a lot of trucks get bought for tax reasons. Some of those purchases are smart. Some are a business spending $70,000 to avoid $20,000 of tax, which is a strange trade if you did not need the truck.

Here is what the rules actually allow in 2026, and the three things that decide whether a year-end purchase does what you hope.

The two write-offs, and how they differ

Section 179 lets you elect to deduct the cost of qualifying equipment in the year you place it in service, instead of depreciating it over years. For 2026 the ceiling is $2.56 million, phasing out once total qualifying purchases pass $4.09 million. For most small businesses those numbers are theoretical — you will never hit them.

Bonus depreciation does something similar but works differently. It was permanently restored to 100% for qualifying property acquired and placed in service after January 19, 2025. It has no dollar ceiling and no business-income limit.

They interact, and which one your preparer reaches for first has real consequences. That is genuinely their call, not a decision to make from a blog post.

The three rules that decide everything

1. Placed in service, not paid for

The deduction attaches to the year the asset is placed in service — available and ready for its intended use in your business. Not the year you ordered it, not the year you paid the deposit.

A truck you pay for on December 28th that gets delivered January 6th is a next-year deduction. Every year somebody wires money in the last week of December and is unpleasantly surprised. If a year-end purchase is part of the plan, delivery date is the date that matters.

2. Business use has to be over 50%

Section 179 requires the asset be used more than 50% for business in the year you place it in service. Below that, no 179 election.

Worse, if business use drops below 50% in a later year, part of the deduction can be recaptured — added back to income in that later year. A truck bought for a busy season and mostly used personally two years on can turn into a tax bill you did not plan for. Keep the mileage log; it is the evidence of business-use percentage.

3. Section 179 cannot create a loss

The 179 deduction is limited to your taxable business income. If you had a thin year, you may not be able to use the full election — the excess carries forward rather than disappearing, but it does not help this year’s bill.

Bonus depreciation does not have this limitation, which is one of the practical reasons it often ends up doing the heavy lifting.

Vehicles have their own rules

This is where most of the confusion lives, and where the internet is most confidently wrong.

Two things people get wrong here. The $32,000 SUV cap applies only to the Section 179 portion — it does not limit bonus depreciation, which is why the "write off the whole G-Wagon" posts are not simply made up, just incomplete. And GVWR is the rating on the door jamb sticker, not the truck's curb weight. Check the sticker, not a forum.

The arithmetic people skip

A deduction reduces taxable income; it is not a rebate. If your combined marginal rate is about 30%, a $50,000 deduction saves roughly $15,000 of tax. You are still $35,000 out of pocket.

So the question is never "does this save me tax." It always does. The question is whether you needed the asset.

• You need the truck anyway and planned to buy next spring. Pulling it into this year is a genuine win — same purchase, deduction a year earlier.
• You do not need the truck. You have converted $50,000 of cash into a depreciating asset to avoid $15,000 of tax. That is a $35,000 decision dressed as a tax strategy.
• You are financing it. Worth noting you can generally deduct the full cost in year one while paying for it over five, which helps the year’s tax bill and does nothing for the next sixty months of payments.

What to do in the next few weeks

1. Get a realistic profit number for the year. The 179 election is limited by business income, so you need to know roughly where you will land before deciding anything.
2. Separate genuine needs from tax-driven wants. Write the list before you look at the deduction. The list you write afterwards is a different list.
3. Check delivery dates, not order dates. Placed in service by December 31, or it is next year’s deduction.
4. Check the door sticker on any vehicle where the weight class matters.
5. Talk to your preparer before you buy, not in April. The ordering of 179 versus bonus, and their effect on state tax and future-year depreciation, is exactly the thing they are for.

The records part

Whatever you buy, keep the invoice with the date, the amount, and what it was. For vehicles, keep the mileage log too — the business-use percentage is what supports the deduction, and it is what you will need again if use drops later and recapture comes up.

A $60,000 truck with a clean paper trail is a deduction. The same truck with a bank line reading "SUPERIOR MOTORS" and no invoice is an argument.