General Contractor Tax Guide

General Contractor Tax Deductions:
The Complete 2026 Guide

Most general contractors overpay taxes because their CPA doesn't know the deductions specific to the trades. This guide covers every legal write-off, including the subcontractor 1099 rules most GCs miss completely.

MM
Mary MattisonEnrolled Agent (EA) · Contractor Specialists
Updated May 202610 min read
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01As a general contractor running my own jobs, how much of my tax bill am I actually keeping in my pocket?
The Quick Answer

General Contractor Tax Deductions in 2026

  • Tools, trailers, and equipment (Section 179 full expensing available)
  • Work truck: standard mileage ($0.725/mile) or actual expense method
  • Home office, if you do admin work and run bids in a dedicated space
  • Licensing, continuing education, permits, and surety bonds
  • Liability insurance, builder's risk, and self-employed health insurance
  • Retirement contributions via SEP-IRA up to $72,000 (most miss this)
  • Business supplies, building materials, and consumables
  • Phone (business-use %) and job management software (BuilderTrend, Procore)
Primary authority: IRS Pub 334 (self-employment), IRS Pub 946 (depreciation), IRS Pub 587 (home office).
Wide shot of contractor's hands holding blueprints at an active construction site
02“OK, so what can I actually write off as a general contractor?”

Deductions by Category

The GC 1099 Trap: Don't Blow Your Deductions

The number one reason general contractors fail IRS audits isn't missing tool receipts—it's misclassifying workers or failing to issue 1099s to subcontractors. If you pay a drywaller, painter, or framer $600 or more by check, cash, or bank transfer during the year, you must issue them a 1099-NEC.

The golden rule of working with subs: Never let them start work or hand them their first check until they have filled out and signed a W-9 form. If you pay them and they disappear without giving you their tax ID, the IRS can disallow your entire deduction for their labor.

Credit card exception: If you pay subs via credit card or third-party networks like PayPal (Goods & Services), the payment processor issues the 1099-K. You don't need to issue a 1099-NEC for those payments.

03OK. But are there deductions most general contractors don't even know they're missing?
Commonly Missed

What Most General Contractors Miss

The retirement account most contractors skip
A SEP-IRA lets you put away up to 25% of what you earn (up to $72,000 in 2026). If you made $150K this year, that is potentially $30,000 off your taxable income before you even file. At a typical combined rate, that is about $8,500 you keep instead of sending to the IRS. Almost no general preparer brings this up. We always do.
Picking the wrong truck deduction method
If your work truck is heavy-duty (over 6,000 lbs like an F-250), the actual expense method almost always beats the standard mileage rate, especially in the year you buy it. A $65,000 work truck can generate $20,000 to $35,000 in deductions in year one using actual expense. Choosing the wrong method could cost you thousands.
Mishandling subcontractor 1099s
If you pay a sub $600 or more via cash or check, you must issue a 1099-NEC. If you do not, the IRS can completely disallow your deduction for their labor during an audit. That means paying taxes on money you already gave to someone else. It is the single biggest audit trap for general contractors.
04OK so I know what to deduct. But when do I actually have to pay, and how do I avoid getting hit with a penalty?

Quarterly Estimated Tax for Contractors

When you work for yourself, the IRS doesn't wait until April to get paid. You're expected to pay taxes four times a year as you earn. Miss one of those payments and you'll get hit with an underpayment penalty, usually 4–7% on whatever you shorted them. The easy way to avoid this: pay at least what you owed last year, split into four payments. That's called the safe harbor rule, and following it means no penalty no matter what you end up owing in April.

Income PeriodPayment DueQuarter
Q1: Jan 1 to Mar 31April 15, 2026Full quarter
Q2: Apr 1 to May 31June 15, 2026Short quarter
Q3: Jun 1 to Aug 31September 15, 2026Full quarter
Q4: Sep 1 to Dec 31January 15, 2027Full quarter
Quick estimate formula: Take your expected annual net profit × 25.3% (15.3% SE tax + estimated 10% income tax for most brackets). Divide by 4 for your quarterly payment. Example: $120K net profit × 25.3% = $30,360/year, divided by 4 = $7,590/quarter. Your actual rate depends on deductions and filing status.
05So I know what I owe and when. Is there a way to actually keep more of what I earn?

Earning $75K+ Net? There's a Strategy Worth Knowing.

Once your contracting business is clearing $75,000 or more in net profit, there's a legal structure change that can put a significant chunk of money back in your pocket. It's called an S-Corp election, and it works by changing how your income is classified, reducing the portion subject to self-employment tax. Here's what the difference looks like on $100K:

LLC (no S-Corp)
$14,130
SE tax on $100K net
With S-Corp Election
~$5,650
Payroll tax on $60K salary
Read the S-Corp Guide for General Contractors
06That covers the big stuff. But what about all the other questions contractors always ask?

General contractor at desk reviewing financial documents and project folders
Every deduction in this guide is money back in your pocket, including deductions many generalist preparers miss.

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Tax information disclaimer: This guide is for general educational purposes only and does not constitute tax advice. Tax laws change and individual situations vary. Consult a licensed tax professional before making tax decisions. The deduction examples above are illustrative. Your actual deductible amounts depend on your specific income, expenses, and filing situation. Trade Tax Pro provides tax preparation services, not legal advice.
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