You sent your last invoice, wrapped your last project, and sat down to figure out what you owe at tax time. The number on the screen is bigger than you expected. Significantly bigger. Your crews worked hard, your projects finished on time, and your rates were fair. Nothing about the year felt unusual. So where is the extra tax coming from? The answer is almost always the same for anyone operating as an independent contractor: the tax system treats you differently the moment you stop being an employee, and most contractors do not find out how until the first bill arrives.
It is coming from self-employment tax. Every independent contractor owes 15.3% of their net profit toward Social Security and Medicare, on top of ordinary income tax. At a salaried construction job, that 15.3% was split between you and your employer, with half of it handled before your paycheck was ever cut. When you run your own business, both halves are yours to pay. That structural shift, which you can see laid out clearly in any 1099 vs W-2 comparison, is almost always the reason a contractor's first independent tax bill lands harder than anything they paid as an employee.
The important part comes next. The same tax code that creates this obligation also provides a specific set of self-employed tax deductions designed to reduce it. Every qualifying mile you drive to job sites, supplier yards, permit offices, and client meetings is a deduction that shrinks the net profit self-employment tax is calculated against. So are your home office costs, tools, subcontractor payments, and equipment purchases. Contractors who build good habits around tracking those expenses pay considerably less than those who do not. This guide walks through the full picture. For a detailed breakdown of every qualifying mileage category and a free estimate of your savings, the Mileage Deduction for General Contractors page runs the numbers for your specific situation.
Payroll taxes fund Social Security and Medicare. Every working American contributes, but the mechanism is different depending on how they are paid. W-2 employees have their share withheld from each paycheck while their employer handles the matching half separately, before the worker ever sees the money. Independent contractors receive their full contract amount and handle the tax obligation personally. Because there is no employer to cover the matching share, the contractor owes the complete 15.3%: 12.4% for Social Security and 2.9% for Medicare. This is reported on Schedule SE and paid alongside your regular income tax. The IRS calls this self-employment tax, and for contractors earning $80,000 or more, it routinely represents the largest single line on their tax bill.
There is one meaningful offset the IRS provides. You can deduct 50% of whatever you owe in self-employment tax directly from your gross income on Form 1040. This above-the-line adjustment reduces your adjusted gross income before income tax rates are applied, which lowers the overall bill in two ways at once. It does not eliminate the SE tax obligation, but it softens the impact and should be on every self-employed contractor's return without exception.
Beyond that offset, the most effective lever contractors have is the net profit figure itself. SE tax is calculated on net profit, not gross revenue. Gross contracting income of $95,000 with $25,750 in legitimate business deductions produces a net profit of $69,250. SE tax on $69,250 is $9,901. SE tax on the full $95,000 gross would be $13,702. That $3,801 difference is not the result of any special strategy. It is the basic arithmetic of claiming what the IRS already allows.
Most independent contractors spent time as W-2 employees before going out on their own. The tax comparison between the two arrangements surprises nearly everyone who sees it laid out directly.
Reading the table from left to right, two rows favor the W-2 employee: SE tax responsibility and estimated tax withholding. Every other row favors the independent contractor. Mileage, home office, tools, equipment, vehicle costs, retirement accounts, and the QBI deduction are all inaccessible to a W-2 construction worker and fully available to a self-employed contractor. The SE tax burden is real. But it comes packaged with a deduction framework that a salaried employee never gets to use.
Abstract percentages are hard to act on. A concrete example is more useful. Below is a realistic tax picture for a general contractor actively managing three to four residential projects, with a service area covering several municipalities.
Gross contract income for the year: $95,000. Business miles logged across job site visits, supplier runs, bidding drives, permit offices, and subcontractor check-ins: 22,000. Home office deduction for a dedicated workspace used for estimating, billing, and client coordination: $3,200. Tools and equipment purchased for active projects: $4,800. Additional business expenses covering phone use, subcontractor coordination costs, and business insurance: $1,800. At the 2026 IRS standard mileage rate of 72.5 cents per mile, mileage alone produces a $15,950 deduction.
That $2,941 is not recovered through any special maneuver. It is recovered by logging miles as they happen, maintaining basic expense records, and filing a Schedule C that reflects actual business costs. Use the 1099 tax calculator to build a version of this scenario using your own numbers. The Mileage Deduction for General Contractors page includes a savings estimator built around the mileage patterns contractors actually generate across a full working year.
Mileage tends to be the largest Schedule C deduction for most general contractors, but it is not the only one. Each category below reduces the net profit figure that SE tax is applied to. The cumulative effect is significant. A contractor using all of them is working within a very different tax environment than one who only claims mileage. For a complete list of what self-employed contractors can write off, see 25 self-employed tax write-offs for 2026.
The IRS standard mileage rate converts each qualifying business mile into a set per-mile deduction. For general contractors, that typically covers 60 to 75% of total Schedule C deductions in a given year. The range of qualifying trips is broader than most contractors initially assume. Job site visits, bidding drives, supplier runs, permit office trips, subcontractor coordination, and client meetings all count. Contractors who only log daily site check mileage are leaving a substantial portion of their deduction unclaimed. The full breakdown of what trips qualify is on the Mileage Deduction for General Contractors page.
One decision with long-term consequences: you must choose between the standard mileage method and the actual expense method in the first year you place a vehicle in business service. Choosing actual expenses with depreciation locks you out of the standard rate for that vehicle in future years. For most contractors running a reliable work truck, the standard rate is simpler and typically produces a larger deduction.
A dedicated workspace used regularly and exclusively for business qualifies for the home office deduction. For general contractors, this commonly covers the space where estimating, client communication, billing, and project documentation happen. The direct deduction is valuable on its own. The secondary benefit is equally important: a qualifying home office transforms your morning drive to the first job site of the day from a non-deductible personal commute into fully deductible business mileage. That shift can add thousands to your annual mileage deduction without any additional driving.
Tools, hand equipment, safety gear, and job-site supplies are deductible business expenses when purchased for contracting work. Section 179 of the tax code allows you to write off the full purchase price of qualifying equipment in the year it is placed in service, rather than spreading depreciation across multiple years. For a contractor who invests in new equipment at the start of a busy project season, Section 179 can produce a meaningful one-year deduction. Keep receipts and a brief note of which project or job function each purchase supported.
Payments made to licensed subcontractors for project work are among the largest deductible expenses on most general contractor returns. They are fully deductible as direct business costs on Schedule C. Maintain records of each sub's name, payment amount, license information, and the project they worked on. For any subcontractor paid more than $600 in a calendar year, you are required to issue a 1099-NEC. Keeping that paperwork organized throughout the year prevents a scramble at filing time.
The business-use portion of a contractor's monthly phone bill is deductible. For a contractor taking client calls, coordinating subs, running project management apps, and navigating between sites for most of the working day, the business-use percentage is likely to be high. Document your typical daily usage pattern briefly in case it is ever questioned. A straightforward note about how you use the phone for work is sufficient support.
General contracting is not classified as a Specified Service Trade or Business under IRS rules, which means most independent contractors qualify for the qualified business income (QBI) deduction. The QBI deduction can reduce taxable income by up to 20% of net self-employment profit. On a $69,250 net profit, that is a $13,850 deduction. At a 22% federal tax rate, the tax savings exceed $3,000. The deduction is available to most contractors at typical income levels and costs nothing beyond accurate record-keeping. A notable share of qualifying contractors miss it entirely.
A SEP-IRA allows self-employed contractors to contribute up to 25% of net self-employment income and deduct the full amount. On a $69,250 net profit, a maximum contribution of $17,312 both builds retirement savings and reduces taxable income. The contribution deadline extends to your tax filing date including any extensions, which means you can finalize the contribution amount after reviewing your full-year numbers. It is one of the few deductions where the optimal amount can be calculated precisely before committing.
Project payments arrive in irregular intervals. The IRS collects on a fixed quarterly schedule. Managing the gap between those two timelines is where many newly independent contractors run into trouble. It is rarely a matter of spending money they should have kept. More often, nobody explained that quarterly estimated tax payments were required at all.
The underpayment penalty is not a flat charge applied at filing. It accrues daily from the missed payment date, calculated on the amount that should have been paid. A Q1 payment missed in April generates a penalty that continues growing through Q2, Q3, and into the following April. The earlier a payment is missed, the more that penalty compounds.
The most straightforward protection is the prior-year safe harbor. Take your total federal tax bill from last year, divide it by four, and pay that amount each quarter. As long as those four equal payments are made on time, the IRS cannot assess an underpayment penalty regardless of how your current-year income changes. If your income grew substantially, you may still owe additional tax at filing, but you will not owe penalties on top of it.
Q3 warrants special attention. Summer and early fall represent peak earning season for most general contractors: permit approvals accelerate, daylight hours extend, and residential project demand peaks. If Q1 and Q2 payments were calculated based on a slower prior year, a strong summer can create a sizable gap. Recalculate before the September 15 deadline. The quarterly tax planning guidecovers every estimation method in detail.
A practical habit that eliminates year-end surprises: treat every client payment like a split transaction. When a payment clears, move 25 to 30% of it immediately into a separate account reserved for taxes. That account sits untouched until a quarterly payment is due. Contractors who build this reflex from their first independent project are rarely caught short at the end of the year.
Contractors who work with multiple clients often wonder whether they need a separate filing for each relationship. The answer is no. All contracting income, regardless of how many clients generated it, flows into one Schedule C. You are a single self-employed business. You report total gross income and deduct total business expenses to arrive at the net profit that SE tax applies to. For a step-by-step walkthrough of the forms involved, see how to file taxes as an independent contractor.
Clients issue 1099-NEC forms reflecting the gross amount each paid you during the year. Add those totals together for your Schedule C gross income line. Then itemize and subtract every qualifying expense. The result is net profit. That is the number SE tax is calculated on, not the total of your 1099 forms.
Entering the combined 1099 total directly as taxable income is the single most costly mistake on self-employed contractor returns. A contractor with $95,000 in gross income and $25,750 in legitimate deductions owes SE tax on $69,250. If that same contractor files $95,000 as the taxable figure, the overpayment in SE tax alone exceeds $3,800, before accounting for the difference in income tax. Every dollar entered correctly on Schedule C reduces both obligations at once.
A dated mileage log with origin, destination, business purpose, and distance for every business trip. 1099-NEC forms and project contracts from every client. Receipts or records for every other deductible expense. Keep all records for at least three years from the date you file. Use the Everlance deduction finder to identify any expense categories your return may be missing. The IRS mileage log requirements guide covers the documentation standard the IRS applies to vehicle deductions specifically.
The most common mileage problem for general contractors is not fraud or overstatement. It is understatement. Contractors who do not track in real time consistently log fewer miles than they actually drove, because the trips that happen outside of direct job site work are the easiest to forget.
Here is what a real-time log captures that a year-end estimate will miss:
● Bidding and estimating drives: the trip to measure a prospective property or walk a site before a contract is signed is deductible, but it happens weeks before the project officially starts and is easily overlooked by filing time
● Multi-stop days: a single workday visiting two job sites, a lumber yard, and a permit office produces four or five separate deductible legs, not one combined estimate
● Subcontractor coordination trips: driving to a sub's shop, a staging location, or a secondary site to keep a project on schedule counts as ordinary and necessary business travel
● Municipal and inspection visits: every trip to a building department, permit office, or inspection location qualifies fully
● Pre-project site assessments: scouting a location before a bid is submitted still meets the IRS standard for deductible business activity
● Work vehicle maintenance: oil changes, tire service, and shop visits for a vehicle used in the business are deductible miles
For a contractor managing four active projects, the trips that fall outside of daily site visits can represent 20 to 35% of total qualifying mileage for the year. That is not a rounding error. At 72.5 cents per mile, 6,000 untracked miles is $4,350 in unclaimed deductions.
The Mileage Deduction for General Contractors page lists every qualifying trip category and includes a savings estimator built around realistic contractor mileage patterns.
Logging mileage from memory instead of in real time. The IRS requires contemporaneous documentation, meaning records created at or near the time of each trip. A mileage log assembled weeks later from project notes does not meet that standard and is the most common reason vehicle deductions get disallowed during audits. Use an automatic GPS mileage tracker that captures every drive as it happens. If you prefer to start with a manual option, a free mileage log template gives you the correct structure.
Filing gross 1099 income as taxable profit. Your 1099 forms show gross contract payments before any deductions. Net profit after Schedule C expenses is the correct taxable figure. Filing gross income as profit overstates SE tax by thousands of dollars and is entirely avoidable with basic record-keeping.
Skipping quarterly payments or paying them late. Underpayment penalties accrue from the missed due date, not from April 15. A payment missed in April generates a penalty that grows for the rest of the year. Review the quarterly tax schedule and set calendar reminders for all four deadlines.
Not taking the home office deduction. A dedicated workspace used for estimating, billing, and client communication almost certainly qualifies. Beyond the deduction itself, a qualifying home office converts the first drive of each workday from a non-deductible commute into fully deductible business mileage. Few single decisions have as much compounding value in the contractor deduction stack.
Skipping the 50% SE tax deduction on Form 1040. Half of your self-employment tax can be deducted from gross income as an above-the-line adjustment. This reduces adjusted gross income and feeds into both income tax rates and the QBI deduction calculation. It is one of the most frequently missed adjustments on self-employed returns.
Overlooking the qualified business income deduction. Most general contractors qualify for the QBI deduction, which can reduce taxable income by up to 20% of net business profit. At typical contractor income levels, the relevant income thresholds are not a barrier. Calculate it each year and take it.
Choosing the actual expense method in year one without comparing both options. Electing actual vehicle expenses with depreciation in the first year you use a vehicle for business locks you out of the standard mileage rate for that vehicle permanently. For most contractors running a practical work truck, the standard rate wins on both simplicity and deduction amount. Compare before committing.
Not issuing 1099-NEC forms to subcontractors paid over $600. This is both a compliance requirement and a record-keeping discipline. Contractors who track sub payments carefully enough to issue 1099s are also contractors with clean Schedule C documentation. The two habits reinforce each other, and the penalty for non-compliance is avoidable.
General contracting is demanding work. The business side of it, including SE tax, quarterly payments, and Schedule C documentation, adds a layer of complexity that W-2 employment does not have. That complexity is real. But so is the deduction framework that comes with it, and most contractors are using only part of it.
The contractors who consistently pay the least in taxes are not necessarily the ones earning the most. They are the ones who capture every qualifying mile the day it is driven, document every business expense when it occurs, submit quarterly payments before the penalty clock starts, and file a Schedule C that accurately represents what it cost to run their business that year. The annual tax difference between a contractor who operates that way and one who estimates everything at year-end typically runs $4,000 to $7,000.
Start with mileage. It is the single largest lever most contractors have, and the gap between what is actually driven and what gets claimed is where most of the money is being left behind. The Mileage Deduction for General Contractors page covers every qualifying trip category with specific examples, explains the current IRS rate and what it means for your income level, and includes a free estimator that puts a real dollar figure on what consistent tracking is worth.
General contractors: your SE tax bill is bigger than it should be. Here is the fix.
We help people save time and money. At Everlance, we're on a mission to empower mobile workers and businesses. That sometimes leads us to generalize tax information. Everlance team members are not certified tax professionals. If you need help with your specific tax situation, please reach out to your tax advisor.
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