HVAC Business: LLC vs. S-Corp, Tax Structure, and QBI Deduction

By Yarik Yarosh, CPA ·September 5, 2026 ·5 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

HVAC (heating, ventilation, and air conditioning) is one of the highest-revenue trade businesses, with strong demand in both new construction and the replacement/service market. The business isn’t a Specified Service Trade or Business (SSTB) under IRC 199A, meaning the full 20% QBI deduction applies at all income levels. HVAC has a unique revenue advantage over many trades: service agreements (maintenance contracts) provide predictable recurring revenue, typically 20-40% of total revenue for an established company. This recurring revenue smooths seasonality, supports higher business valuations, and makes estimated tax planning easier. Equipment costs for a service-focused HVAC business are moderate (a van, tools, refrigerant recovery equipment, and diagnostic tools), but installation-focused companies require larger investments (sheet metal equipment, brazing gear, duct fabrication tools).

✓Key takeaway

HVAC tax profile:

SSTB classification: NOT an SSTB

HVAC installation, repair, and maintenance is a trade service
Full QBI deduction at all income levels
No phase-out above $266,950 (single) / $533,900 (MFJ)

Revenue model:

Service/repair call: $150-$500 (diagnostic + repair)
AC system installation (residential): $5,000-$12,000
Furnace installation: $3,000-$8,000
Full system (AC + furnace): $8,000-$20,000
Ductwork installation/replacement: $3,000-$10,000
Maintenance agreement: $150-$400/year per customer
Average established HVAC company: $500,000-$2,000,000/year
Solo/small operation (service focus): $100,000-$300,000/year

Revenue mix (established company):

Revenue Stream	% of Total	Margin
Installations (new/replacement)	40-50%	25-35%
Service/repair calls	25-35%	50-65%
Maintenance agreements	15-25%	60-70%
Indoor air quality add-ons	5-10%	40-50%

Service and maintenance are higher-margin because labor is the primary cost (equipment is already in the van). Installations have lower margins because the equipment cost (condenser, air handler, furnace) is 40-50% of the contract.

Cost structure (solo service tech):

Parts and materials: 15-25% of revenue
Van operating costs: 5-8%
Tools/equipment maintenance: 2-3%
Insurance: 3-5%
Licensing/EPA certification: 1%
Net margin: 55-70%

Cost structure (installation company, 3-5 employees):

Equipment (condensers, furnaces, etc.): 35-45% of install revenue
Labor: 20-30%
Workers’ comp: 3-5%
Parts/supplies: 5-8%
Vehicle costs: 3-5%
Insurance: 2-3%
Net margin: 12-22%

Major investments:

Equipment	Cost	Section 179
Service van (Sprinter/Transit)	$30,000-$55,000	Yes (over 6,000 lbs)
Refrigerant recovery machine	$1,000-$3,000	Yes
Manifold/gauge set (digital)	$300-$800	Yes
Vacuum pump	$200-$500	Yes
Leak detector	$200-$500	Yes
Combustion analyzer	$500-$1,500	Yes
Sheet metal tools (for ductwork)	$1,000-$3,000	Yes
Brazing/soldering equipment	$500-$1,500	Yes
Van shelving/organization	$2,000-$5,000	Yes
Total solo service	$35,000-$70,000

S-Corp analysis:

Solo service tech at $150,000 revenue, $90,000 net: S-Corp saves $3,000-$4,000/year
Reasonable salary: $35,000-$55,000 (based on employed HVAC technician wages)
HVAC techs are among the highest-paid trade workers ($45,000-$70,000 as employees)
This higher salary benchmark means the S-Corp distribution (and FICA savings) is smaller relative to trades with lower employee wages
S-Corp break-even: approximately $65,000-$75,000 net profit

How should an HVAC business be structured for taxes?

Hypothetical example

Round numbers. A solo HVAC service technician. Year 2. Single filer. Focused on service calls and maintenance agreements (no large installations).

Revenue: $180,000

Service/repair calls (400 at $300 avg): $120,000
Maintenance agreements (150 customers at $200/year): $30,000
Small installations/replacements (10 at $3,000 avg): $30,000

Expenses: $48,000

Parts and materials: $25,000
Van operating (fuel, maintenance, insurance): $8,000
Insurance (GL + bonding): $3,500
Tools/equipment: $2,000
Licensing/EPA renewal: $500
Phone/software (ServiceTitan/Housecall Pro): $3,000
Marketing: $4,000
Continuing education: $1,000
Home office: $1,000

Net profit: $132,000

Sole proprietorship:

SE tax: $132,000 x 92.35% x 15.3% = $18,644
QBI: $132,000 x 20% = $26,400
Taxable: $132,000 - $9,322 - $15,000 - $26,400 = $81,278
Income tax: $13,090
Total: $31,734
Effective rate: 24.0%

S-Corp ($55,000 salary):

FICA: $55,000 x 15.3% = $8,415
Distribution: $132,000 - $55,000 - $4,208 = $72,793
QBI: $72,793 x 20% = $14,559
Taxable: $127,793 - $15,000 - $14,559 = $98,234
Income tax: $15,385
S-Corp costs: $2,500
Total: $26,300
Effective rate: 19.9%

S-Corp saves: $5,434/year

The $55,000 salary is at the high end but justified: employed HVAC service technicians earn $45,000-$70,000 depending on market and certification level. An EPA-certified technician with NATE certification running their own truck commands the higher end.

Maintenance agreements as a valuation multiplier: 150 agreements at $200/year = $30,000 in recurring revenue. This has a 60-70% margin ($18,000-$21,000 net profit).

When selling an HVAC business, maintenance agreements are valued at 1.5-3x annual revenue:

150 agreements x $200 x 2.0 multiple = $60,000 in additional business value
This value exists independently of the owner

For tax purposes, if you sell the business:

The maintenance agreements are an intangible asset
The buyer amortizes them over 15 years under IRC 197
You recognize capital gain on the sale (favorable long-term capital gains rate if held over 1 year)

EPA Section 608 certification: Required to purchase and handle refrigerant. The certification exam costs $100-$200. This is deductible as a business education expense. Without it, you can’t legally work on systems containing refrigerant, making it effectively mandatory.

NATE (North American Technician Excellence) certification: $250-$350 per specialty. Each NATE certification is deductible and adds $3,000-$7,000/year in earning power (employers pay a premium for NATE-certified techs, and certified contractors can charge higher rates).

Refrigerant costs (increasingly significant): R-410A (common residential): $75-$200/jug (was $50-$80 five years ago) R-22 (legacy, phased out): $300-$800/jug (scarce) The cost of refrigerant is rising and becoming a more significant deductible expense. Leak repair revenue is also rising because the cost of lost refrigerant is higher.

Illustrative numbers only, not a real client and not advice for your facts.

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Cite this page

Yarik Yarosh, CPA. "HVAC Business: LLC vs. S-Corp, Tax Structure, and QBI Deduction." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/hvac-contractor-entity-structure-scorp

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.