Tax Write-Offs for Contractors: A 2026 Checklist for the Self-Employed Trade

Here is the short version. If you are a self-employed trade contractor, almost every dollar you spend to do the work is deductible, and the code is more forgiving about proof than most people fear. In 1930, Broadway's George M. Cohan spent freely on his productions and kept no receipts; the tax board allowed him nothing. Judge Learned Hand reversed, writing that "to allow nothing at all appears to us inconsistent with saying that something was spent," and required a close approximation instead. That case — Cohan v. Commissioner, 39 F.2d 540 (2d Cir. 1930) — is still the oldest rule on your side: a real expense does not vanish because a receipt did.

There is one hard exception, and it comes before anything else on this list: vehicles and travel get no Cohan estimate. Those fall under a strict-substantiation rule in IRC §274(d), so a court cannot approximate for you — you need an actual log. Everything else, if the expense was clearly real, a court can estimate in your favor. That hierarchy is the spine of this checklist. For how the pieces fit together across the year, start at our contractor tax planning hub.

What actually counts as a deductible business expense?

The test is "ordinary and necessary" — the tax code's standard for a business write-off, meaning common in your trade and helpful to the work. It does not mean essential or that you had no cheaper option; it means a reasonable person in your line of work would see the cost as part of doing business. That standard is broader than most contractors assume. A duct camera, a set of gauge manifolds, steel-toe boots you wear only on job sites — all ordinary and necessary. The coffee you grab on the way to a job is not, because it is personal spending that merely happened during the workday. The line is not "was I working when I spent it," but "would someone in my trade call this a cost of the business."

What are the vehicle and truck deductions — and why is this the one to get right?

Start with the warning, because this is the category the IRS audits hardest. Vehicles fall under IRC §274(d), the strict-substantiation rule, so the Cohan estimate does not apply. You need a contemporaneous log — the date, business purpose, destination, and miles for each trip. A mileage app takes ten seconds at each end of a drive, and it is the one record worth being religious about, because without it the deduction can be disallowed in full no matter how real the driving was.

With that settled: for 2026 you have two methods. Standard mileage tracks business miles times a per-mile IRS rate. Actual expenses track gas, insurance, repairs, registration, and depreciation, then apply your business-use percentage. You pick a method in the first year the vehicle goes into service, and that choice shapes your options in later years, so run both before you commit.

The rules shift in your favor for a heavy truck or van — gross vehicle weight rating over 6,000 pounds — used more than 50% for business. It can qualify for Section 179 expensing up to a $32,000 heavy-SUV cap for 2026, with 100% bonus depreciation on the balance — a serious first-year deduction on a new service truck. But the 50% test is real: if business use drops to 50% or below in a later year, the excess deduction gets recaptured into income. For the full breakdown, see our contractor vehicle tax deduction guide.

How does equipment and tool depreciation work in 2026?

Two provisions do the heavy lifting, and both are strong for 2026. Section 179 — the election that writes off equipment in full the year it goes to work, instead of stretching the deduction over five or seven years — has a 2026 limit of $2,560,000, phasing out dollar for dollar only once you place more than $4,090,000 of equipment in service in a year. That phase-out is built for industrial-scale buyers, not the working trade, so for you the ceiling is effectively the whole cost.

Bonus depreciation sits alongside it, now permanently 100% for qualified property acquired after January 19, 2025, per IRS guidance under the One Big Beautiful Bill. It is a first-year write-off of the full cost, applied automatically unless you elect out. So a furnace-install rig, a commercial pressure washer, or a set of diagnostic tools can all be deducted in full the year you put them into service.

The difference matters. Section 179 lets you pick which assets to expense and is capped by your business income — it cannot create a loss. Bonus depreciation hits all qualifying assets automatically, can create a loss, and can be switched off asset by asset. The common play is to use Section 179 up to the income limit and let bonus depreciation handle the rest. For the mechanics, see our contractor equipment depreciation guide.

Can I deduct the materials and supplies I buy for jobs?

Yes, and for most trades this is the single largest category. Materials you buy and install at a job site are deductible as cost of goods sold or as supplies, depending on how you account for inventory. Refrigerant, copper line sets, sheet metal, PVC, concrete mix, lumber, fasteners, conduit, wire — every consumable that ends up part of the finished job is fully deductible.

The distinction to keep clean is materials versus tools. A material is consumed or installed on the job, so it is deducted in full that year. A tool lasts more than a year, so it runs through depreciation or Section 179. The tube bender is a tool; the copper you bend with it is a material. A note for those of us in California and other sales-tax states: on materials you install you are the end user, not a reseller, so you pay sales tax at purchase — and that sales tax is part of your deductible cost.

How does the home office deduction work when I work at job sites?

This is the deduction that was quietly rewritten for people exactly like you. After the Supreme Court denied a doctor's home office in Commissioner v. Soliman, 506 U.S. 168 (1993), Congress amended IRC §280A in the Taxpayer Relief Act of 1997 so that a home office qualifies when it is used for the administrative or management side of the business with no other fixed location for that work. That is the contractor pattern in one sentence: you run the trade at job sites and do the paperwork — estimates, invoicing, scheduling, books — at home.

The space has to be used regularly and exclusively for the business. A kitchen table where you also eat dinner does not qualify; a converted bedroom, a dedicated office, or a separate shop building does. Then choose a method. The simplified method deducts $5 per square foot up to 300 square feet — a $1,500 ceiling — with no receipts to track. The actual-expense method deducts the business percentage of your real home costs: rent or mortgage interest, property tax, utilities, insurance, repairs, and depreciation on the home. With a genuine dedicated office the actual method usually wins, but the simplified method is a clean floor when you would rather skip the math.

Which is the fast checklist of common contractor write-offs?

Here is the working list. Everything below is deductible when it is ordinary and necessary to your trade. The right-hand note tells you the rule that governs it — because the rule behind a deduction is what decides whether it survives.

What subcontractor and labor costs can I deduct, and what do I have to file?

Every dollar you pay a 1099 subcontractor is a deductible labor expense. The reporting is the part people get tripped up on. For 2026, the 1099-NEC filing threshold is $2,000 — the 1099-NEC being the form that reports what you paid a contractor, with a copy going to the IRS to match against that person's return. So you file one for any sub you paid $2,000 or more. The deduction does not depend on whether you filed the form, but the penalties for skipping it do.

Before the first check goes out, collect a W-9 — the one-page form that gives you a sub's legal name and tax ID for 1099 time. If a sub refuses to hand over a tax ID, you must apply backup withholding, holding back 24% of the pay for the IRS. That is not a judgment call. For when to file and how to classify a worker as a sub versus an employee, see our guides on when to give a 1099 to a contractor and whether to hire employees or use 1099 subcontractors.

Can I deduct health insurance as a self-employed contractor?

Yes, and it is one of the most valuable deductions you have. A self-employed contractor deducts 100% of health insurance premiums above the line — meaning it comes off your income before you land on adjusted gross income, the number that governs a stack of other tax breaks and, two years later, your Medicare surcharges. It covers medical, dental, and vision premiums for you, your spouse, and your dependents. The limits: the deduction cannot exceed your net self-employment income, you cannot take it in a loss year, and it is off for any month you were eligible for coverage through an employer — yours or a spouse's. For the full rules, see our contractor health insurance tax deduction guide.

What meal, travel, and clothing costs are deductible?

Meals are 50% deductible when business is genuinely discussed — a working lunch over a bid, a coffee with a supplier to sort a delivery — or when you travel overnight for an out-of-area job. The plain solo lunch near a site is personal and gets nothing. Travel and lodging for out-of-area work are deductible, but travel sits under the same strict-substantiation rule as vehicles: keep the records, because there is no Cohan estimate to rescue a thin travel file.

Work clothing is deductible only when it is not adaptable to everyday wear. Steel-toe boots, branded uniforms, hard hats, high-vis vests, and specialized protective gear qualify. Jeans and a plain T-shirt do not, even if you only ever wear them on the job, because you could wear them to the grocery store. The test is suitability for personal use, not your habits.

How do self-employment tax and the half-deduction work?

Self-employment tax is 15.3% on net earnings up to the Social Security wage base of $184,500 for 2026 — the Social Security and Medicare tax on your business profit, both halves, because as a sole proprietor you are the employer and the employee. Above the wage base the 12.4% Social Security portion stops, while the 2.9% Medicare portion keeps running with no cap. The relief is built in: you deduct one-half of your self-employment tax as an above-the-line adjustment to income. You do not track or claim it separately — it flows through the calculation automatically. For how SE tax is figured and the moves that reduce it, see our self-employment tax guide for contractors.

What is the QBI deduction and how much can it save me?

The qualified business income deduction shields up to 20% of your business profit from income tax, and it is available to sole proprietors, LLCs, and S-Corps alike. For 2026 the income thresholds are $201,750 for single filers and $403,500 for married filing jointly. Below the threshold it is simple: 20% of your qualified business income, no wage or property limits. For most working contractors that is the whole story — a fifth of the profit comes off before the brackets apply. Above the threshold the deduction gets limited by the W-2 wages and property basis of the business, which is one of the real arguments for looking hard at entity choice as your income climbs.

One reassurance while you are there: your entity does not change which write-offs you get. Every deduction on this checklist is available whether you are a sole proprietor, an LLC, or an S-Corp. A sole proprietor deducts them on Schedule C — the form where a sole proprietor reports business income and expenses on the personal return — and a single-member LLC is taxed the same way by default. What entity changes is how self-employment tax hits, since an S-Corp owner pays it only on W-2 wages, not on distributions. That is a payroll-tax question, not a write-off question. For the full comparison, see our LLC vs S-Corp guide for contractors.

How much should I set aside for taxes on all this?

Here is our standing rule for trade contractors: the day you take a draw, sweep 25 to 30 cents of every net dollar into a separate tax account. In a no-income-tax state, 25% of net is the target; in California, 30%; in an unusually good year, more. Always apply the percentage to net, never gross — the materials you pass through to the customer are not your income.

That set-aside covers self-employment tax plus federal and state income tax, and it is the habit that keeps write-offs from becoming a false sense of security. Deductions lower the bill; they do not make it zero. For the full framework and the quarterly rhythm behind it, see our guides on how much to set aside for taxes and paying quarterly taxes.

What records do I actually need to keep?

Keep what you can, but keep it by the hierarchy. For vehicles and travel, you need a contemporaneous log: the miles, the date, the destination, and the business purpose. The Cohan rule does not reach these — §274(d) means no log, no deduction, however obviously real the driving was. For nearly everything else, a court can estimate in your favor if the expense was clearly real and the overall pattern is credible. Good records simply move a deduction from "arguable" to "automatic."

Practically: bank and card statements showing vendor, amount, and date carry most ordinary expenses. For big-ticket buys — equipment, vehicles, major tools — hold the actual invoice. The statute of limitations, the IRS's own deadline to audit a return, is generally three years from filing and longer for large underreporting. Keeping records seven years is the safe default, and it costs nothing but a folder.

Not sure which of these write-offs you are leaving on the table? We build a defensible, trade-specific deduction plan for contractors — the right method on the truck, the depreciation election that fits your year, and the records that make each write-off hold up. Book a meeting with our team here.