With 100% bonus depreciation in play and Section 179 limits raised again, construction companies have a powerful, time-sensitive opportunity to deduct heavy equipment in the year of purchase. Here is the strategy, the timing, and the documentation that turns deductions into real cash flow.
For most contractors, the largest annual capital expenditures land in two categories: heavy equipment and vehicles. The IRS gives us two parallel tools to recover those costs quickly: Section 179 expensing and bonus depreciation. Used together and used early, they can shift hundreds of thousands of dollars of taxable income out of a single year and into immediate cash flow.
Used carelessly, they leave money on the table or trigger unwanted tax consequences in future years. The difference is strategy.
Section 179, in plain English.
Section 179 of the IRS Code allows a business to expense the full purchase price of qualifying equipment in the year it is placed in service, rather than depreciating it slowly over five or seven years. For 2026, the deduction limit has been raised again, with a phase-out threshold that increases alongside it.
Qualifying property includes most tangible business assets: heavy equipment, vehicles over a certain GVWR, machinery, computers, software, and certain improvements to non-residential real property. The asset must be used more than 50 percent for business and must be acquired by purchase, not gift or inheritance.
The most important nuance is the income limitation. Section 179 cannot create a loss. If your taxable business income is $200,000 and you try to expense $300,000 of equipment under Section 179, you can only use $200,000 of the deduction in the current year. The remaining $100,000 carries forward, but the cash flow impact is delayed.
Bonus depreciation, and why 100% changes everything.
Bonus depreciation is a separate, parallel rule. It allows businesses to deduct a percentage of the cost of qualifying property in the first year. After several years of phasedowns, 100 percent bonus depreciation has been restored for qualified property placed in service through the current window.
Unlike Section 179, bonus depreciation has no taxable income limitation. It can create or increase a net operating loss, which can then be carried forward to offset future income. For contractors with significant equipment spend, that net operating loss treatment is often the more powerful tool.
Bonus depreciation also applies automatically to qualifying property unless the taxpayer elects out. Many contractors do not realize they have already claimed it, or that the election to opt out is a year-by-year, class-by-class decision with real strategic value.
How we sequence them for contractors.
The right move is rarely either-or. For most of our construction clients, we sequence the two tools intentionally.
Step one: Section 179 to absorb current-year income
If your business has a strong year and we expect taxable income above your usual range, Section 179 lets us soak up that income with equipment expense, dollar-for-dollar, without creating a loss that might raise audit attention or complicate your bonding application.
Step two: bonus depreciation for the rest
Once Section 179 is maxed against current income, bonus depreciation handles any remaining basis on qualifying property. If that pushes you into a net operating loss, that loss carries forward against future income, often at higher marginal rates.
Step three: keep some assets on regular depreciation
Counter-intuitively, the optimal answer is often to leave a portion of equipment on standard five- or seven-year depreciation. This smooths income across multiple tax years, which preserves bonding capacity, R&D credit eligibility, and other planning tools that depend on consistent reported profitability.
Aggressive use of Section 179 and bonus depreciation reduces book income, which can reduce the working capital and stockholder equity that sureties evaluate. We coordinate equipment deduction strategy with bonding strategy on every engagement.
The timing detail most contractors miss.
The rule is "placed in service," not "purchased." Equipment qualifies for the year it is delivered, set up, and ready for productive use. A crane purchased in December but not delivered until January is a next-year deduction, not this year's.
For high-dollar equipment ordered late in the year, we coordinate directly with the vendor on delivery and commissioning dates. A 30-day delivery slip can move a $300,000 deduction from one tax year to the next, which can be the difference between a strategic deduction and an unused one.
Documentation that protects the deduction.
The IRS scrutinizes large equipment expensing, especially for newer entities or those with bonus depreciation losses. Documentation should include:
- Purchase invoices showing date of purchase, full cost, and vendor details.
- Delivery confirmation establishing the placed-in-service date.
- Business use log for any asset that could have personal use (especially vehicles).
- Section 179 election properly noted on the tax return.
- Bonus depreciation election or opt-out documented at the asset class level.
For audited returns, this documentation also feeds directly into your bonding application. Sureties want to see equipment values, depreciation schedules, and the financial reality that backs the deductions.
What to do before year-end.
If you are reading this and the year is anything but January, equipment strategy is on the clock.
- Run a tax projection based on year-to-date results and estimated finish-the-year activity.
- Identify equipment needs that would qualify if purchased and placed in service this year.
- Pre-coordinate vendor delivery to lock in placed-in-service dates.
- Review bonding implications with your surety before committing.
- Decide on Section 179 vs bonus depreciation asset by asset, not at the last minute.
Equipment strategy is one of the highest-leverage tax decisions a growing contractor makes each year. Done well, it preserves cash, accelerates ROI on capital purchases, and feeds the financial strength that sureties and bankers want to see. Done poorly, it leaves real money on the table.
Talk to a senior CPA before you order. Every conversation we have on this topic is free, no obligation, and built around your specific equipment plans for the year.