Construction businesses spend a lot of money to make money. Between trucks, equipment, subcontractors, materials, insurance, and job-related expenses, thousands of dollars can move through your business every month.
The challenge isn’t simply knowing that these expenses exist. It’s making sure they’re tracked, categorized, and documented correctly so they aren’t overlooked at tax time.
For contractors, builders, electricians, plumbers, and other construction businesses, accurate bookkeeping can make the difference between having clean records that support your deductions and trying to reconstruct an entire year from bank statements and receipts.
Here are five major categories of tax deductions construction businesses should be tracking throughout the year.
1. Vehicles, Equipment, and Tools
For many construction businesses, vehicles and equipment represent some of the largest expenses on the books.
Depending on the circumstances, deductible costs may include work trucks and vans, trailers, heavy equipment, power tools and smaller equipment, repairs and maintenance, fuel, registration fees, insurance, and other costs associated with business use.
Larger equipment purchases may need to be depreciated rather than deducted as an ordinary expense. However, tax provisions such as Section 179 and bonus depreciation may allow qualifying businesses to deduct some or all of the cost of eligible property sooner.
Vehicle expenses require particular attention because business and personal use may need to be separated. Depending on the vehicle and circumstances, taxpayers may use actual vehicle expenses or the IRS standard mileage method.
For 2026, the IRS business mileage rate was initially 72.5 cents per mile and increased to 76 cents per mile for business miles driven beginning July 1, 2026.
Bookkeeping tip: Don’t wait until tax season to figure out which fuel purchases, repairs, equipment purchases, and mileage were business-related. Maintain mileage logs and keep business transactions separated and properly categorized throughout the year.
2. Home Office Expenses
A construction company may perform most of its work at job sites, but a surprising amount of the business can happen at home.
If you regularly handle estimating, scheduling, invoicing, bookkeeping, payroll, project management, or other administrative work from a qualifying home office, you may be eligible for the home office deduction.
Generally, the space must be used regularly and exclusively for business, and additional requirements apply. Importantly for contractors, the IRS recognizes that a home may qualify as the principal place of business when administrative or management activities are performed there and there is no other fixed location where the taxpayer conducts substantial administrative or management activities.
Eligible taxpayers generally have two methods available.
Under the simplified method, the deduction is calculated at $5 per square foot of qualifying space, up to 300 square feet, for a maximum of $1,500.
Under the regular method, qualifying actual expenses are allocated between business and personal use. These can include expenses such as mortgage interest or rent, utilities, insurance, repairs and maintenance, real estate taxes, and depreciation, subject to applicable rules and limitations.
Bookkeeping tip: Keep good records even if you aren’t sure which method you’ll ultimately use. Your tax professional can make a much better determination when the underlying expenses are already organized.
3. Subcontractors and Employee Labor
Labor is often one of the largest costs on a construction company’s profit and loss statement.
Ordinary and necessary labor costs can generally include employee wages and salaries, bonuses, employer payroll taxes, qualifying employee benefits, workers’ compensation insurance, and payments to subcontractors.
Subcontractors require especially careful recordkeeping.
For payments made in 2026, the federal reporting threshold for many payments reported on Form 1099-NEC increased from $600 to $2,000. Payments for services performed by nonemployees generally become reportable once the applicable threshold is met, although exceptions and additional reporting rules apply.
That makes vendor management an important part of construction bookkeeping—not something to think about for the first time in January.
Bookkeeping tip: Collect a completed Form W-9 from subcontractors before you pay them, rather than chasing them down at year-end. Your bookkeeping records should also clearly distinguish subcontractor labor from employee payroll and other job costs. See our post about how to Streamline Your Small Business Procedures for the New Year for more information.
4. Materials, Supplies, and Job Costs
Lumber. Concrete. Wire. Pipe. Fasteners. Paint. Roofing materials. Safety equipment.
Construction businesses can have enormous material and supply costs, but simply recording everything as “materials” doesn’t necessarily give you useful financial information.
Your books should allow you to see not only what you spent, but – when practical – which jobs generated those costs.
Depending on your business and accounting method, materials and supplies may be treated differently for tax and accounting purposes. Timing can also become important when materials are purchased in one period but used on a project in another.
From a management perspective, accurate job costing can also tell you something a tax return cannot: whether you actually made money on the project.
If a $50,000 job required $22,000 of materials, $15,000 of labor, and thousands more in subcontractors and other direct costs, revenue alone doesn’t tell you whether the job was profitable.
Bookkeeping tip: Don’t use one giant “construction expenses” account. Separating materials, subcontractors, direct labor, equipment, permits, and other major cost categories makes both tax preparation and profitability analysis significantly more useful.
5. Business Insurance
Insurance is a substantial – and often unavoidable – cost of operating a construction company.
Depending on your business, deductible insurance expenses may include general liability insurance, commercial auto coverage, workers’ compensation insurance, commercial property coverage, equipment or inland marine coverage, and other policies directly related to the business.
The key is distinguishing legitimate business coverage from personal insurance expenses and making sure payments are consistently recorded in the appropriate accounts.
Insurance costs should also be reviewed from a management perspective. As your payroll, equipment, vehicles, revenue, and operations change, your coverage needs may change with them.
Bookkeeping tip: Review insurance expenses at least annually. Your books should make it easy to identify what the company is spending on coverage rather than forcing you to hunt through twelve months of transactions.
The Deduction You Miss Is Often the Expense You Didn’t Track
Knowing which expenses might be deductible is only part of the equation.
A deduction is much easier to substantiate when the underlying transaction was properly recorded when it happened.
That’s particularly important in construction, where one business may have dozens of jobs, subcontractors, vehicles, equipment purchases, material suppliers, credit cards, and bank transactions moving at the same time.
Our guide on maximizing tax deductions is a deep dive into this topic. For now, just remember that good bookkeeping creates a financial record that shows:
- what the business spent,
- what the expense was for,
- which vendor was paid,
- when it was paid,
- and, when appropriate, which project or job generated the cost.
That doesn’t just make tax time easier. It gives you better information for estimating future projects, controlling costs, managing cash flow, and understanding which jobs are actually profitable.
Better Books Mean Better Decisions
At Serenity Solutions, we work with construction and trades businesses to turn day-to-day transactions into financial information owners can actually use.
That includes properly categorizing expenses, tracking subcontractors and W-9 information, maintaining clean records for 1099 reporting, improving job-cost visibility, reconciling accounts, and producing financial reports that give you a clearer picture of where your money is going.
Your tax professional ultimately determines which deductions apply to your specific situation. Our job is to make sure they aren’t working with a shoebox – or its digital equivalent – when it’s time to make that determination.
If your construction company is growing but your bookkeeping hasn’t kept pace, Serenity Solutions can help you build a stronger financial foundation.
Contact Serenity Solutions to learn more about our bookkeeping services for construction and trades businesses.
