Contractor Tax Deductions: What You Can Actually Write Off

The Moil Team · 7 min read · Published 2025-03-31 · Last updated 2026-08-26

The contractor tax deductions trades owners miss most — vehicle, tools, home office, retirement — and how to track them without an April panic.

The tax deductions contractors miss most are the ordinary ones: business miles on the truck, tools and equipment, the home office where the invoicing happens, the business share of the phone bill, insurance premiums, and retirement contributions. Every one of them is a legitimate business expense the IRS expects you to claim — but nobody at the IRS will remind you, and a deduction you didn't track is a deduction you can't take. If you're a plumber, electrician, HVAC tech, landscaper or cleaner running your own show, this guide covers what's deductible and, more importantly, how to capture it as you go.

What Vehicle Expenses Can a Contractor Deduct?

For most trades businesses the truck is the single biggest deduction. You can generally choose between the standard mileage rate — a per-mile figure the IRS updates regularly, so check the current rate rather than using last year's — or actual expenses: the business share of fuel, insurance, repairs and depreciation. Either way, the deduction lives or dies on your mileage log. Track every business mile with an app or a notebook in the cab; a contractor covering a metro area puts real money on that log every single week, and an estimated log reconstructed in April is exactly what auditors ignore. One caution: the drive from home to a regular office is commuting, not business travel — though trips between job sites, supplier runs and customer visits all count.

Tools, Equipment and the Stuff in the Van

Hand tools, power tools, diagnostic gear, ladders, safety equipment — if you bought it for the work, it's a business expense. Larger equipment purchases can often be deducted in the year you buy them rather than depreciated over several years, under provisions like Section 179; the caps are generous for a small shop, but ask your CPA how a big purchase is best treated in the year you make it. Materials and supplies for jobs are deductible too, which is one more reason every receipt should land in the same place the moment you get it.

The Home Office Is Real — If the Space Is

If a part of your home is used regularly and exclusively for running the business — scheduling, quoting, invoicing, calls — you can deduct it, either by a simplified per-square-foot method or as a percentage of actual home expenses. The word that matters is exclusively: a desk in the corner of the bedroom that only ever does business qualifies; the kitchen table does not. Contractors skip this one out of audit fear, but a legitimate, documented home office is a normal deduction, not a red flag.

The Deductions Hiding in Your Monthly Bills

• Phone and internet: the business-use percentage is deductible. Track one typical month to establish the split, then apply it.
• Business insurance: general liability, commercial auto, workers' comp, tool coverage — deductible.
• Health insurance: self-employed owners can generally deduct premiums for themselves and family; ask your CPA how it applies to your structure.
• Software and subscriptions: your accounting software, scheduling tool, website hosting — and yes, Moil — are business expenses.
• Marketing: ads, yard signs, vehicle wraps, door hangers, the Little League sponsorship. If it promotes the business, it counts.
• Training and certifications: license renewals, safety courses, trade certifications and the travel to get them.
• Business meals: meals with a client, prospect or crew for a genuine business purpose are generally partially deductible — keep the receipt and note who you met and why.
• Subcontractor payments: fully deductible — and file the required 1099 forms for subs you pay above the IRS reporting threshold (check the current figure; it has changed recently).
• Work clothing: uniforms, branded shirts and safety gear qualify. Ordinary clothes you could wear anywhere do not, even if you only wear them on site.

Retirement Contributions: The Biggest Overlooked Deduction

A profitable contractor's largest available deduction is usually the one they never open: a self-employed retirement account such as a SEP-IRA or Solo 401(k). Contributions reduce your taxable income now and build the asset that eventually lets you put the wrench down. The contribution limits are substantial and adjust over time, so get the current figures from your CPA — but the principle is stable: money you pay yourself-in-the-future beats money you pay in tax today. Pass-through owners should also ask about the qualified business income deduction, which can shelter a meaningful slice of profit for eligible businesses; the eligibility rules are exactly the kind of thing to confirm rather than assume.

How to Track Deductions Without Going Crazy

The system matters more than the list. A deduction you can't document might as well not exist, and the owners who overpay aren't the ones who don't know the rules — they're the ones with a shoebox of faded receipts and a mileage guess.

• Run the business on its own bank account and card. Never mix personal and business spending — it's the single change that makes everything else easy.
• Photograph every receipt the moment you get it, into one app or folder.
• Log miles daily, automatically if possible.
• Set aside a fixed percentage of every payment you receive into a separate tax savings account — your CPA can tell you the right percentage for your bracket and state.
• Spend fifteen minutes a month reviewing expenses instead of forty hours in April.

Clean invoicing feeds clean books: automating your invoices means every job's revenue is recorded the day it's earned, which is half of tax season done before it starts. And if your crew or customers work in Spanish, keeping your core business documents bilingual means the records behind your deductions are ones everyone in the shop can actually read.

Don't Forget Quarterly Estimated Taxes

Self-employed contractors generally owe tax as the year goes along, not in one April payment. If you expect to owe more than a small amount for the year, the IRS wants quarterly estimated payments — roughly mid-April, mid-June, mid-September and mid-January — and charges interest-based penalties on underpayment. The percentage you set aside from each job is what makes these painless. Check the current due dates and safe-harbor rules at IRS.gov, or let your CPA set the quarterly amounts once and revisit them when revenue changes.

Put Taxes in the Plan, Not in the Panic

Taxes stop being frightening when they're a line in your financial plan instead of a surprise. A business plan with real projections tells you roughly what you'll owe before the year starts, which tells you what to set aside from every job. Our step-by-step business plan guide shows what the financial section should contain — and Moil Professional at $25/month writes the whole plan for you, with financial projections, coaching and documents in English and Spanish, so the tax conversation with your CPA starts from real numbers instead of a shrug.