Construction Tax Deductions: What Every Contractor Can Write Off in 2026 | Projul

Most contractors pay more in taxes than they need to. Not because they’re bad at math, but because nobody told them what they can actually write off.

A quick disclaimer before we get into it: this is not tax advice. We’re a construction management company, not CPAs. Talk to your accountant before making any tax decisions. What we can do is point you toward the deductions that contractors commonly miss so you can have a better conversation with your tax professional.

That said, we’ve talked to hundreds of contractors, and the pattern is always the same. They know about the obvious stuff like truck payments and tool purchases. But they’re leaving thousands of dollars on the table every single year because they don’t know about the rest.

Let’s fix that.

Why Contractors Leave Money on the Table at Tax Time

Here’s the thing about tax deductions: the IRS doesn’t send you a reminder. They’re not going to call you up and say, “Hey, you forgot to deduct your safety boots and that continuing education course you took in March.” That’s on you.

And most contractors are busy running jobs, not studying the tax code.

The result? The average small contractor misses between $5,000 and $20,000 in legitimate deductions every year. That’s real money. On a $500K revenue business, that could be the difference between a 5% and 8% net margin.

The biggest reasons contractors miss deductions:

• No system for tracking expenses. Receipts get lost. Credit card statements pile up. By April, it’s a shoebox of crumpled paper and a prayer.
• They don’t know what qualifies. If you didn’t know your phone bill, work boots, and retirement contributions are deductible, you probably didn’t claim them.
• Their accountant doesn’t understand construction. A generalist CPA might know tax law, but they don’t know your business. They can’t ask about deductions they don’t know you have.
• They mix personal and business expenses. One bank account for everything means guessing at what’s business and what’s personal. Guessing means leaving money behind.

The fix isn’t complicated. It starts with knowing what you can deduct, then setting up a basic system to track it throughout the year. Not at tax time. Throughout the year.

Software like Projul with QuickBooks integration makes this a lot easier. When your job costs, time tracking, and invoicing all flow into your accounting software automatically, you’re not scrambling to reconstruct 12 months of activity in March.

Vehicle and Equipment Deductions

This is where the big money is for most contractors. Your trucks, trailers, excavators, and skid steers are all depreciable assets. And in 2026, there are several ways to write them off.

Section 179 Expensing

Section 179 lets you deduct the full purchase price of qualifying equipment in the year you buy it, instead of depreciating it over several years. For 2026, the deduction limit is expected to be around $1.25 million (it adjusts for inflation each year, so confirm with your CPA).

What qualifies:

• Trucks, vans, and work vehicles
• Construction equipment (excavators, loaders, compactors)
• Tools and machinery
• Computers and software
• Office furniture and equipment

The equipment needs to be used for business more than 50% of the time. And it has to be purchased and put into service during the tax year you’re claiming it.

Bonus Depreciation

Bonus depreciation is similar to Section 179 but works a bit differently. Under the Tax Cuts and Jobs Act, bonus depreciation has been phasing down. In 2026, it’s at 20% (down from 100% in 2022 and 40% in 2025).

That means if you buy a $100,000 piece of equipment, bonus depreciation covers $20,000 in the first year. The rest gets depreciated on a normal schedule.

The key difference from Section 179: bonus depreciation can create a net operating loss (Section 179 generally can’t). If your business had a rough year, that might actually be useful.

Vehicle Deductions: Mileage vs. Actual Expenses

You have two options for deducting vehicle costs:

Standard mileage rate: For 2026, expect a rate around 70 cents per mile (the IRS adjusts this annually). You track your business miles and multiply. Simple.

Actual expense method: You deduct a percentage of all vehicle costs based on business use. That includes gas, insurance, repairs, tires, registration, loan interest, and depreciation.

Which is better? It depends on the vehicle. For a newer truck with a high payment, actual expenses usually wins. For an older truck that’s paid off, mileage rate might come out ahead. Run both numbers for your situation.

One important note: if you use the standard mileage rate in the first year, you can switch to actual expenses later. But if you start with actual expenses and claim depreciation, you’re locked in.

Heavy vehicle rule: Vehicles over 6,000 pounds GVWR (gross vehicle weight rating) get special treatment under Section 179. Most full-size trucks like the F-250, Ram 2500, and Silverado 2500 qualify. The deduction can be significantly higher than for lighter vehicles. This is one of the most valuable deductions contractors miss because they don’t realize their work truck qualifies.

Tracking It All

Whatever method you choose, you need a mileage log. The IRS wants dates, destinations, business purposes, and miles driven. A notebook in the glovebox works. An app works better.

And for equipment, job costing software makes a real difference. When you can see exactly which equipment is assigned to which job, and how many hours it ran, you’ve got clean records for both your taxes and your profitability analysis.

Home Office and Shop Deductions

If you run your contracting business from a home office or a detached shop on your property, you can deduct a portion of your housing costs. But there are rules.

The Requirements

Your home office or shop must be:

1. Used regularly and exclusively for business. A kitchen table where you do estimates at night doesn’t count. A spare bedroom that’s set up as your office with a desk, computer, and filing cabinet? That counts.
2. Your principal place of business. For most contractors, this means it’s where you do your administrative work, even if the actual construction happens on jobsites.

A detached shop or garage where you store equipment, do fabrication, or prep materials also qualifies as long as it’s used exclusively for business.

Regular Method (Percentage Method)

Measure your office or shop space and divide it by the total square footage of your home. That percentage gets applied to:

• Mortgage interest or rent
• Property taxes
• Homeowner’s insurance
• Utilities (electric, gas, water, internet)
• Repairs and maintenance to the home
• Depreciation of your home

So if your office is 200 square feet and your home is 2,000 square feet, that’s 10%. If your annual housing costs are $30,000, you’d deduct $3,000.

For a detached shop, you can deduct 100% of the costs directly related to that structure plus a proportional share of property-level expenses like insurance and property taxes.

Simplified Method

The IRS offers a simplified option: $5 per square foot, up to 300 square feet. Maximum deduction is $1,500 per year.

For most contractors, the regular method gives you a bigger deduction. But the simplified method is easier if you don’t want to track all those expenses separately.

What About Your Shop or Yard?

Many contractors have a separate shop, storage yard, or equipment lot. If it’s not on your residential property, those costs are 100% deductible as business rent or property expenses. Lease payments, utilities, insurance, and maintenance all count. No special home office rules apply because it’s a dedicated business property.

Job-Related Expenses Most Contractors Forget

Beyond the big stuff like trucks and equipment, there are dozens of smaller expenses that add up. A lot of contractors skip these because each individual expense seems small. But $200 here and $500 there adds up to thousands over a year.

Tools and Supplies

Every tool you buy for work is deductible. That includes:

• Power tools (drills, saws, grinders, nail guns)
• Hand tools (hammers, tape measures, levels, wrenches)
• Consumables (blades, bits, sandpaper, tape, fasteners)
• Tool bags, belts, and storage

If a tool costs less than $2,500, you can deduct it immediately under the de minimis safe harbor election. More expensive tools get depreciated or expensed under Section 179.

Safety Gear and Work Clothing

Work boots, hard hats, safety glasses, high-vis vests, gloves, hearing protection, and fall protection are all deductible. So are uniforms and work clothing that isn’t suitable for everyday wear. Your company t-shirts with your logo? Deductible. Your steel-toe boots? Deductible.

Regular clothing isn’t deductible, even if you only wear it to work. But if it has your company name on it or it’s protective gear, it counts.

Continuing Education and Training

OSHA certifications, trade school courses, industry conferences, and specialized training are all deductible. This includes:

• Course fees and tuition
• Travel expenses to get there
• Materials and books
• Association dues (NAHB, AGC, local HBAs)

If training maintains or improves skills for your current trade, it’s deductible. If it qualifies you for a completely new career, it’s not. A plumbing contractor taking an advanced plumbing course? Deductible. That same plumber going to law school? Not deductible.

Licenses, Permits, and Certifications

Your contractor’s license fee, bond premiums, permit costs, and any professional certifications are all deductible. Don’t forget about renewal fees too.

Phone and Internet

If you use your personal phone for business (and what contractor doesn’t?), you can deduct the business-use percentage. Same for your home internet if you use it for estimates, scheduling, and communicating with clients.

Using time tracking and project management software on your phone actually supports the case that it’s a business tool. Just saying.

Software and Subscriptions

Every software subscription you use for business is deductible. That includes:

• Construction management software like Projul
• Accounting software
• Estimating tools
• Design and takeoff software
• Cloud storage
• Communication tools

Insurance Premiums

Business insurance premiums are fully deductible. That includes:

• General liability insurance
• Workers’ compensation
• Commercial auto insurance
• Builder’s risk insurance
• Professional liability
• Tools and equipment coverage
• Business interruption insurance

If you’re self-employed, you can also deduct your health insurance premiums (medical, dental, and vision) for yourself and your family. This is an above-the-line deduction, meaning you don’t even need to itemize to claim it.

Subcontractor Payments

Every payment you make to subcontractors is a deductible business expense. Just make sure you’re collecting W-9s and filing 1099s for anyone you pay $600 or more in a year. Missing 1099s can trigger penalties and audit flags.

Interest and Loan Costs

Interest on business loans, equipment financing, credit cards used for business purchases, and lines of credit are all deductible. If you financed that new skid steer or took out a loan for a big project, the interest portion of those payments is a write-off.

Retirement Plans That Save Contractors Thousands

Thousands of contractors have made the switch. See what they have to say.

This is the deduction most contractors completely ignore. And it’s potentially the biggest one.

Retirement contributions reduce your taxable income dollar for dollar. If you contribute $50,000 to a retirement plan, that’s $50,000 less in taxable income. At a 24% tax bracket, that’s $12,000 in tax savings. Plus you’re building wealth for later.

Here are the three main options for contractors:

SEP IRA (Simplified Employee Pension)

Best for: Solo contractors or small businesses with few employees.

• Contribute up to 25% of net self-employment income
• Maximum contribution around $69,000 for 2026 (adjusts annually)
• Super easy to set up and manage
• Contributions are tax-deductible
• Deadline to set up and fund: your tax filing deadline (including extensions)

The catch: if you have employees, you must contribute the same percentage for them as you do for yourself.

Solo 401(k)

Best for: Solo contractors or owner-and-spouse businesses with no other employees.

• Higher contribution limits than SEP IRA for many income levels
• Employee contribution (up to $23,500 in 2026) plus employer contribution (up to 25% of compensation)
• Total limit around $69,000 for 2026 (plus $7,500 catch-up if you’re 50+)
• Optional Roth contributions (after-tax money that grows tax-free)
• Loan provision available with some plans

For contractors earning between $50,000 and $200,000, the Solo 401(k) often allows higher contributions than the SEP IRA. Run the numbers with your accountant.

SIMPLE IRA

Best for: Small businesses with 1-100 employees who want an easy plan.

• Employee contributions up to $16,500 in 2026
• Employer match of up to 3% of compensation
• Lower contribution limits than SEP or Solo 401(k)
• Easy to administer
• Must be set up by October 1 of the tax year

The SIMPLE IRA works well if you have a crew and want to offer them a retirement benefit. It’s less useful if you’re trying to maximize your own contributions.

Quick Comparison

Pick the one that fits your business structure and talk to your accountant about the right contribution level.

Record Keeping That Makes Tax Time Easy

All these deductions are worthless if you can’t prove them. The IRS requires documentation for everything you deduct. And “I know I spent money on that” doesn’t cut it.

Here’s what good record keeping looks like for a contractor:

Separate Your Finances

Get a dedicated business bank account and credit card. Today. If you’re still running personal and business expenses through the same account, you’re making tax time ten times harder than it needs to be.

Every business expense goes on the business card. Every personal expense goes on the personal card. No exceptions. No “I’ll sort it out later.”

Track Expenses as They Happen

The best time to categorize an expense is when it happens. Not three months later when you’re staring at a credit card statement trying to remember what that $47.83 charge at Home Depot was for.

Use your accounting software. Use your phone to snap receipts. Use construction management software with QuickBooks integration to automatically sync job costs and expenses.

The goal is simple: when your accountant asks for your records, you hand them a clean set of books. Not a shoebox.

Keep These Records

For every deduction, you should have:

• Receipts for purchases over $75 (the IRS technically doesn’t require receipts under $75, but having them doesn’t hurt)
• Mileage logs with dates, destinations, and business purpose
• Home office measurements and calculations
• Equipment purchase records with dates in service
• Bank and credit card statements for the full year
• 1099s for subcontractors you paid
• Retirement plan contribution records
• Insurance policy documents and premium records

Use Software to Your Advantage

This is where job costing tools and time tracking really pay for themselves. When your software tracks labor hours per job, materials purchased, equipment used, and expenses incurred, you’ve got a complete record of where every dollar went.

Come tax time, your accountant can pull clean reports instead of reconstructing your year from scattered paperwork. That also means lower accounting fees, which is its own kind of savings.

If you want to understand how these costs fit into your bigger financial picture, our construction overhead costs guide breaks down the full picture of what it costs to run a contracting business.

Curious how this looks in practice? Schedule a demo and we will show you.

Frequently Asked Questions

Can I deduct the cost of my work truck?

Yes. Work trucks are deductible through Section 179 expensing, bonus depreciation, or standard depreciation. Trucks over 6,000 pounds GVWR (like the F-250, Ram 2500, or Silverado 2500) qualify for higher Section 179 deductions. If you use the truck for both business and personal driving, you can only deduct the business-use percentage. Keep a mileage log to document it.

What’s the difference between Section 179 and bonus depreciation?

Section 179 lets you choose how much of an asset’s cost to expense in year one, up to the annual limit. Bonus depreciation automatically applies a set percentage (20% in 2026) to all qualifying assets. You can use both on the same purchase. Section 179 generally can’t create a net loss, while bonus depreciation can. Your CPA can help you figure out which combination saves you the most.

Do I need an LLC to take these deductions?

No. Sole proprietors, LLCs, S-corps, and C-corps can all take business deductions. Your business structure affects how you report income and may change your tax rates, but it doesn’t determine whether expenses are deductible. A sole proprietor reports business income and expenses on Schedule C. An LLC taxed as a sole proprietor does the same thing.

How far back can I claim deductions I missed?

You can file an amended return (Form 1040-X) to claim missed deductions for the past three years. So if you forgot to deduct your safety gear, continuing education, or software subscriptions in previous years, it’s not too late. An amended return does cost money to prepare, so make sure the missed deductions are worth the effort.

Should I hire a CPA who specializes in construction?

Absolutely. A construction-focused CPA understands things like job costing, percentage of completion accounting, retainage, and equipment depreciation methods that a generalist might miss. They’ll ask the right questions and know which deductions apply to your trade. The few hundred dollars extra you might pay for a specialist typically comes back many times over in deductions they find.

The bottom line is this: you’re already earning the money. You’re already spending it on legitimate business expenses. The only question is whether you’re documenting it well enough to get the tax benefit.

Set up a tracking system now. Talk to a construction-savvy CPA. And stop leaving money on the table.