HVAC Tax Deductions: What Your Company Can Claim in 2026

An HVAC company pays tax on profit, not on revenue. Every legitimate business expense you fail to record is profit you invented on paper and then paid tax on. That is the whole game, and it is won or lost in the truck, not in April.

This guide covers what an HVAC business can actually claim, the 2026 numbers (including a mileage change that most guides on this topic still have wrong), and the records the IRS expects you to keep. It is written for the owner of the company. It is not tax advice, and your CPA should see the final return. The point here is knowing what to track before the year is over, because nothing on this page can be reconstructed from memory in April.

The one rule behind every deduction on this page

You cannot claim what you cannot prove. Not "prove" in the sense of remembering it, but in the sense of producing a dated record that shows what you bought, when, and why it was for the business.

Three habits do most of the work:

• Separate the money. A business checking account and a business card. Mixed accounts are the single most common reason an owner gives up on a real deduction: reconstructing it costs more than it saves.
• Capture at the job, not at midnight. A receipt photographed in the parking lot is a record. A receipt in the door pocket is not.
• Keep it for three years. That is the general window in which the IRS can question a return, and it is the reason contemporaneous beats accurate.

Round numbers are also worth avoiding. A $1,237 supply run reads as a real supply run. A $1,200 one reads as an estimate.

Vehicles: usually the biggest number on an HVAC return

The 2026 mileage rate changed in the middle of the year

This is the part almost every guide on this subject has stale, so start here.

For 2025 the business standard mileage rate was 70 cents per mile. For 2026, the IRS set it at 72.5 cents in January, then revised it upward mid-year because of fuel prices. The current IRS standard mileage rates for business use in 2026 are:

• 72.5 cents per mile for business miles driven January 1 through June 30, 2026
• 76 cents per mile for business miles driven July 1 through December 31, 2026

If you log 2026 at a single rate, you understate your own deduction. Here is what that costs on one van driving 15,000 business miles, split evenly across the year:

• 7,500 miles at 72.5 cents = $5,437.50
• 7,500 miles at 76 cents = $5,700.00
• Total mileage deduction: $11,137.50

Run the same 15,000 miles at a flat 72.5 cents and you get $10,875, so the split is worth $262.50 in deduction you would otherwise hand back. On a three van shop that is closer to $800.

The practical consequence is not the arithmetic, it is the record: you need an odometer reading dated on or near June 30 for every vehicle, otherwise you cannot defend the split. If you are reading this after the fact and did not take one, your logging app almost certainly has the trip dates, so the split can be rebuilt from the trips themselves. Do it before the log rolls over.

Standard mileage or actual expenses

There are two ways to deduct what a work vehicle costs you, and you pick one per vehicle:

• Standard mileage. Multiply business miles by the rate above. Simple, and depreciation is already built into the rate, which matters below.
• Actual expenses. Deduct the business-use share of fuel, repairs, tires, insurance, registration and depreciation.

The rough shape of the answer: a dedicated, wrapped, high-mileage service van with real maintenance costs usually does better on actual expenses. A pickup that also collects the kids does better on standard mileage, because the alternative is apportioning every repair bill. Ask your CPA before the first year, because the choice has a tail: if you want the option of using the standard rate on a vehicle later, you generally have to use it in the first year that vehicle is placed in service.

Whichever you choose, the mileage log is not optional. Either it is the deduction itself, or it is the evidence for the business-use percentage.

Writing off the truck itself

Buying a van is a different question from running one, and it is the one owners most often get wrong.

Section 179 lets you deduct the cost of qualifying equipment in the year it is placed in service instead of depreciating it over years. For tax years beginning in 2026 the maximum Section 179 deduction is $2,560,000, reduced once total qualifying purchases pass $4,090,000. Neither of those is the limit that will bind an HVAC shop buying one truck. Two others will:

• The vehicle limits. Sport utility vehicles placed in service in tax years beginning in 2026 are capped at $32,000 of Section 179 deduction. Vehicles that are not SUVs under those rules, such as a cargo van with no seating behind the driver or a pickup with a long enough bed, are treated differently and can qualify for more. The details are specific enough that the truck you choose changes the answer, so check the configuration before you buy, not after. The IRS lays out the rules in Publication 946.
• "Placed in service" is not the purchase date. It is the date the vehicle is available for use in your business. A van bought on December 28 and still at the upfitter on December 31 was not placed in service in that year.

One more trap: you cannot write the truck off twice. If you take the standard mileage rate, depreciation is already inside that rate, so you do not also depreciate the vehicle.

Tools and equipment

The obvious ones are hand tools (gauges, wrenches, pipe cutters), power tools (drills, vacuum pumps), recovery machines, and safety gear (gloves, goggles, harnesses).

The arithmetic is worth doing once so it stops feeling abstract. An $1,800 recovery machine is $1,800 less taxable income. At a 25 percent marginal rate, that is $450 you keep. It is not free money, it is money you already spent and should not be taxed on again.

The ones owners miss:

• Software subscriptions. Dispatch, invoicing, accounting, diagnostic apps.
• Tool maintenance. Blade sharpening, calibration, replacement parts.
• Storage and upfit. Toolboxes, van shelving, ladder racks.

For big-ticket items you may be depreciating rather than expensing, and there are de minimis rules that let smaller purchases go straight to expense. This is exactly the kind of thing a CPA earns their fee on, so keep the invoices and let them make the call. If you are replacing a chunk of your tool stack this year, it is also worth reading how the right HVAC business apps keep those purchases categorized as you buy them rather than at year end.

Training, certification, licenses and local filings

Staying certified is deductible. So is getting there:

• EPA 608, NATE and OSHA certification fees
• HVAC training courses, online or in person
• Study guides and exam prep material
• Travel to training, including lodging and mileage

Licenses and local filings belong in the same bucket and are routinely forgotten: state HVAC and contractor license renewals, contractor bonds, and city or county business tax registrations. What you owe locally varies enormously. An HVAC company in Los Angeles files and pays differently from one in Houston, but the principle holds in both places: the fee you pay for the right to operate is a business expense. Ask your CPA which local filings apply to your address, because that is the part no national guide can answer.

Uniforms and work clothing

Not all clothing counts. The test is roughly whether it is required for the work and unsuitable for everyday wear.

Deductible: shirts carrying your company logo, steel-toe boots, flame-resistant coveralls, and the cost of cleaning work attire.

Not deductible: plain trousers, everyday sneakers, or anything you would happily wear to dinner, even if you only ever wear it on jobs.

Home office

If you handle quoting, scheduling and invoicing from home and have no other fixed location for that admin work, you may qualify. There are two methods:

• Simplified. The IRS simplified option is a standard $5 per square foot of home used for business, up to 300 square feet, so a maximum of $1,500.
• Actual expenses. A percentage of rent or mortgage interest, utilities, and internet, based on the share of the home used.

The space has to be used regularly and exclusively for the business. A desk in the corner of the spare room is defensible. Claiming half the house because the laptop moves around is not.

Supplies, materials and insurance

Refrigerant, line sets, wire, fittings, filters and fasteners are deductible as you consume them. So are office supplies and marketing spend, from business cards to truck wraps to ad budget.

On insurance: general liability, workers compensation if you have employees, commercial auto, and, if you are self-employed, health insurance premiums (which are handled separately from ordinary business expenses, so flag them for your CPA specifically).

What it adds up to for a one van shop

Put together, for a self-employed HVAC contractor running a single van in 2026:

• Tools and equipment: $5,000
• Training and certifications: $3,000
• Mileage, 15,000 business miles at the 2026 split rates: $11,137.50
• Home office, 200 square feet simplified: $1,000
• Insurance and license renewals: $2,200
• Total deductions: $22,337.50

At a 25 percent marginal rate that is roughly $5,584 in tax you do not owe. If you file a Schedule C, the real figure is usually higher, because business expenses reduce self-employment tax as well as income tax. Your CPA will give you the exact number.

Notice what did the heavy lifting. The mileage line is half the total, and it is the line that depends entirely on a log nobody enjoys keeping.

If you are a W-2 technician, this page does not apply to you

This is worth stating plainly, because a lot of HVAC tax content still shows employees a savings example that no longer exists.

Unreimbursed employee business expenses are not deductible for most W-2 employees. As the IRS puts it in the instructions for Form 2106, "Section 67(h) eliminated miscellaneous itemized deductions for tax years beginning after 2017." Form 2106 is now limited to four categories: Armed Forces reservists, qualified performing artists, fee-basis state or local government officials, and employees with impairment-related work expenses. An HVAC technician on a payroll is not one of them, and buying your own tools does not change that.

What to do instead: ask your employer for an accountable reimbursement plan. Under one, the company reimburses you for tools, mileage and gear against receipts, the reimbursement is not taxable income to you, and the company deducts it. That is better for you than a deduction would have been, and it costs the company nothing it was not already spending.

The records that make all of this survivable

Everything above is arithmetic. The reason owners still overpay is that the arithmetic runs on records that were never captured.

The failure is always the same shape. The job happened in June, the parts came off the van, the tech drove 40 miles each way, and none of it was written down anywhere except an invoice total. In April the invoice says $1,450 and nobody can say what it cost to earn.

This is the one place a field service platform genuinely helps, so here is what Swivl's job costing actually does and does not do. It records labor cost automatically as technicians clock in and out, lets them add materials and parts to the job from the mobile app while they are standing in the mechanical room, and tracks equipment and vehicle costs as real line items per job. You get a full cost breakdown from every completed job, filterable by technician, job type or date range, and the cost and revenue data syncs to QuickBooks through one connection.

Being straight about the limits: Swivl is not tax software, it does not file anything, and it does not track your mileage or scan your receipts. Your mileage app and your accountant still own those. What it removes is the reconstruction problem. When the labor, materials and equipment cost of every job is already recorded because recording it was part of doing the job, your CPA is reading history instead of interviewing you about it.

If you are still choosing a platform, we compare the options in our guide to the best HVAC service management software. Whatever you land on, pick it on whether a technician will actually use it in a crawlspace, because a system nobody updates produces exactly the records you have now.

Swivl's Starter plan is free, and the point of starting now rather than in January is that this year's records are the ones you cannot go back and create. Create your Swivl account and start capturing job costs on the next call.

Before you file

Track monthly rather than annually, because a year of receipts is a project and a month of receipts is twenty minutes. Take the June 30 odometer reading. Keep the separate account. And spend the money on a CPA who works with trades businesses, because the fee is itself deductible and the questions above are the cheap ones. The expensive questions are the ones about your entity structure, and those are worth an hour of somebody's time.