Who We Serve · HVAC Companies
Tax and finance for HVAC companies that run on recurring service.
Residential and commercial HVAC companies carry prepaid maintenance revenue, a fleet of service vans, equipment inventory caught in a refrigerant transition and a field workforce paid overtime. Each has its own tax rule, and several changed in 2025 and 2026. We set them up deliberately and keep them current.
- Residential service and replacement
- Commercial mechanical contractors
- Maintenance-agreement programs
- Design-build HVAC firms
- Multi-location service companies
The financial shape of the business
Three businesses, one balance sheet.
Most HVAC companies combine a subscription business, a retail replacement business and, often, a construction business.
01
Prepaid service is a liability first
Maintenance agreements and memberships are collected before the visits are performed. How you account for that cash decides whether it’s taxed when collected or deferred, and how much of your bank balance is already spoken for.
02
Residential replacement lost its federal credit
The §25C energy efficient home improvement credit — 30% of cost, up to $2,000 a year for heat pumps — ended for property placed in service after December 31, 2025. Homeowner decisions now turn on price, financing and operating savings, which puts more weight on your margin and close-rate data.
03
Trucks, technicians and inventory are the cost base
Margin depends on billable hours per technician, cost per truck and how fast equipment turns. The refrigerant transition added inventory risk that has to be valued correctly at year-end.
Tax Advisory
The provisions that shape an HVAC company’s return.
Current law after P.L. 119-21, with the 2026 inflation figures and the IRS and EPA guidance that followed.
- Maintenance agreements: one-year deferral, accrual method onlyUnder §451(c) and Treas. Reg. §1.451-8, an accrual-method company can elect to include the earned portion of an advance payment for services in the year received and defer the rest to the next year — no further. Extended warranties sold with equipment qualify as ancillary warranty contracts. Without an applicable financial statement, ‘earned’ follows the all-events test, measured straight-line over a fixed term or statistically where needed; cash-method companies include agreement revenue when collected.6
- Warranty and callback reserves wait for the workA reserve for future warranty labor or callbacks reduces book income when it’s booked, but §461(h)(2)(B) treats a liability to provide services as incurred only as you perform them. We track the book-tax difference so the reserve doesn’t overstate deductions or understate estimated payments.7
- Fleet expensing: §179, bonus and the SUV capFor 2026, §179 allows up to $2,560,000, phasing out above $4,090,000 of purchases, and 100% bonus depreciation applies to property acquired after January 19, 2025. The $32,000 SUV cap doesn’t reach vans with an integral enclosure, no seating behind the driver and no body section more than 30 inches ahead of the windshield, or pickups with a cargo bed of at least six feet not accessible from the cab. Trucks and vans rated above 6,000 pounds gross vehicle weight are outside the §280F passenger-auto limits, which hold first-year depreciation to $20,300 for 2026 vehicles under them when bonus applies.1,4,2,8,9
- Service vans and the mileage logPickups and vans are generally subject to §274(d) substantiation, but Treas. Reg. §1.274-5(k) excepts a van specially modified so it’s unlikely to see more than de minimis personal use — front bench only, permanent shelving filling most of the cargo area, constantly carrying equipment, painted with the company name. Building vans to that standard removes the mileage-log burden for those vehicles.10
- R-410A inventory after EPA’s 2026 ruleEPA’s final rule, effective July 27, 2026, removed the installation deadline for residential and light-commercial AC and heat-pump systems whose specified components were manufactured or imported before January 1, 2025. Units written down as unsalable at year-end 2025 should be revalued: Treas. Reg. §1.471-2(c) allows subnormal goods at a bona fide selling price less disposal cost, and only when actually offered for sale within 30 days of the inventory date. Companies under the $32 million §448(c) test can instead use the §471(c) small-business inventory methods.3,11,1,12
- Commercial replacements qualify under §179(e)HVAC property installed in a nonresidential building after the building was first placed in service is qualified real property that your commercial customers can expense under §179, along with roofs, fire protection and security systems. For an owner under the phase-out threshold, that turns a rooftop-unit replacement from a long-lived building improvement into a current deduction — a point worth putting in the proposal.2
- §179D for designers of public and nonprofit buildingsOn government, tribal and tax-exempt buildings, §179D(d)(3) lets the owner allocate the deduction to the person primarily responsible for designing the property, which can be a design-build mechanical contractor. For 2026 the deduction runs $0.59 to $1.19 per square foot, or $2.97 to $5.94 when prevailing wage and apprenticeship rules are met. §179D doesn’t apply to property whose construction begins after June 30, 2026, so projects already under way need their start date documented.13,1,4
- Overtime reporting on the W-2 is now mandatoryTechnicians can deduct up to $12,500 of qualified overtime a year ($25,000 joint) for 2025 through 2028, phasing out above $150,000 of modified AGI ($300,000 joint). Only the FLSA-required premium counts — the ‘half’ in time-and-a-half — not double time or state daily-overtime premiums beyond what the FLSA requires. For 2026 there is no transition relief: the deduction is limited to what you report in Form W-2 box 12, code TT, so payroll has to compute it correctly from the first pay period.4,5,14
CFO Advisory
Measure the business by line of service.
Service, replacement and construction work have different margins, cash cycles and capacity limits. We report them separately.
| Metric | What it tells you | Cadence |
|---|---|---|
| Agreement count, renewal rate and deferred revenue | The size and stickiness of the recurring base, and the liability for visits still owed. It drives shoulder-season scheduling and the cash you can count on before the phones ring. | Monthly |
| Gross margin by line of service | Service, replacement, new construction and commercial work costed separately, with labor and fleet allocated. Blended margins hide which line subsidizes the others. | Monthly |
| Revenue per billable technician hour | Billed revenue divided by hours technicians spend on calls. It captures pricing, efficiency and dispatch in one number. | Weekly |
| Replacement close rate and average ticket | Converted replacement opportunities and their average value, by salesperson and lead source. With §25C gone, it is the cleanest read on pricing and financing offers. | Weekly |
| Callback rate and warranty cost | Return visits within a set window and the labor and parts they consume. It feeds technician training and the warranty reserve. | Monthly |
| Cost per truck | Fuel, insurance, maintenance, depreciation and financing per vehicle. It sets the replacement cycle and the billable hours each van has to carry. | Monthly · Per vehicle |
| Inventory turns by refrigerant platform | Equipment on hand split between R-410A and the lower-GWP replacements, aged. It shows where cash is tied up and which units to move first. | Monthly |
| Overtime hours and premium | Overtime as a share of labor hours and the FLSA premium portion, by technician. It is a staffing signal and, now, a W-2 reporting figure. | Per payroll |
Accounting & Compliance
What we run, and who we coordinate with.
We keep the books, payroll and schedules behind your return in-house. Engineering, attest work and sales tax filings stay with specialists we work alongside.
Handled by our team
- Deferred revenue schedules for service agreements — reconciled to your field-service software each month
- Payroll with box 12, code TT — FLSA regular rate and overtime premium computed each pay period
- Fleet and fixed-asset records — §179, bonus and §280F tracking by vehicle, with van specifications on file
- Year-end inventory valuation — counts, aging and write-down support by refrigerant platform
- §179D allocation files — owner allocation letters and the design documentation behind them
- Monthly close and line-of-service reporting — in QuickBooks, tied to your field-service platform
Coordinated with your specialists
- The engineer who performs your §179D energy modeling and inspection — we tie that work to the return
- A sales tax provider such as Avalara or TaxJar — taxability of repairs, parts and service agreements varies by state
- Your audit or review firm — when a bank or commercial customer requires reviewed or audited statements
- Your equipment and fleet lenders — covenant reporting and borrowing-base support
What changed · What’s next
Dates that matter for HVAC companies.
Federal tax and EPA dates from 2025 through early 2027.
§25C ends
The energy efficient home improvement credit doesn’t apply to property placed in service after this date, including heat pumps.4
Code TT reporting required
Relief from separately reporting qualified overtime applied only to 2025. Overtime paid in 2026 has to appear in box 12, code TT for employees to deduct it.5
§179D construction cutoff
Property whose construction begins after this date doesn’t qualify. Property whose construction began earlier can still qualify when placed in service.13
R-410A installation deadline removed
EPA’s rule at 91 FR 31284 took effect, allowing installation of residential and light-commercial systems whose specified components were manufactured or imported before January 1, 2025.3
AheadVRF installation deadline
New variable refrigerant flow systems using HFCs above 700 GWP must be installed by this date if their components were manufactured or imported before January 1, 2026 — January 1, 2028 for projects with a building permit issued before October 5, 2023. EPA’s 2026 rule did not extend it.15,3
Ahead2026 Forms W-2 due to SSA
The first Forms W-2 carrying box 12, code TT are due to the Social Security Administration, on paper or electronically.14
The Beaconshire Method
How an engagement runs.
Four phases, one accountable team. Tax, CFO and accounting work move together, so a decision made in one discipline is already reflected in the other two.
Phase 01
Discovery
We review your revenue streams, agreement terms, fleet list, inventory and payroll setup, and confirm which accounting method each piece is on today.
Phase 02
Strategy
We decide whether advance-payment deferral, inventory methods and fleet expensing fit your income plan, and price agreements and replacements with the tax effect in view.
Phase 03
Implementation
We set up deferred-revenue schedules, code TT payroll, fixed-asset tracking and line-of-service reporting, and file any method changes.
Phase 04
Stewardship
Monthly close and KPI review, quarterly estimates, year-end inventory and fleet planning, and updates as EPA and IRS guidance changes.
Run the numbers first
Where this work lives
Tax Advisory & Planning
Year-round planning, entity design and multi-year projections — scoped so the savings justify the fee.
Explore advisory →Payroll
Owner and staff payroll, payroll-tax filings, multi-state withholding and classification risk.
Explore payroll →Fractional CFO
Forecasts, KPI dashboards, lender and board reporting, and a monthly close review.
Explore fractional CFO →FAQ
Common questions.
Are prepaid maintenance memberships taxable when we collect them?
On the cash method, yes. On the accrual method you can elect the deferral method in Treas. Reg. §1.451-8: include the portion earned by year-end and defer the rest to the following year, but no further. A multi-year prepaid plan is fully taxable by the end of the year after it’s collected.
Can we still install the R-410A equipment in our warehouse?
Yes, if all specified components were manufactured in or imported into the United States before January 1, 2025. EPA’s rule effective July 27, 2026 removed the installation deadline for those systems; new systems built from equipment made or imported on or after January 1, 2025 still have to meet the 700 GWP limit. Servicing existing R-410A systems, including replacing a failed condensing unit, remains permitted.
Our technicians get double time on Sundays. How much goes in code TT?
Only the premium the FLSA requires — generally half the regular rate for hours over 40 in a workweek. Premiums paid beyond that, by policy, contract or state daily-overtime law, are wages but not qualified overtime. We compute the regular rate the FLSA way, including the commissions and nondiscretionary bonuses it counts.
Is a cargo van subject to the $32,000 SUV limit?
Not if it has an integral enclosure around the driver compartment and load area, no seating behind the driver and no body section more than 30 inches ahead of the windshield. Those vans fall outside the SUV definition in §179(b)(5)(B), so the full cost can be expensed under §179, subject to the overall limits. Passenger-style vans with rear seating get a different answer.
We design mechanical systems for a school district. Can we claim §179D?
Possibly. Government and tax-exempt owners can’t use the deduction themselves, so §179D(d)(3) lets them allocate it to the person primarily responsible for designing the property. The building still needs its energy-savings certification, and construction must have begun by June 30, 2026.
Our customers lost the §25C credit. Does that change how we sell?
It removes a federal credit of up to $2,000 a year that many heat-pump proposals relied on, for systems placed in service after 2025. We help you rebuild pricing and financing offers around margin and payback, and we track close rates so you see the effect quickly. For commercial customers, §179(e) expensing remains a real selling point.
Other industries we serve
Sources
- [1]Rev. Proc. 2025-32 (2026 inflation adjustments) — IRS
- [2]26 U.S.C. §179 — Election to expense certain depreciable business assets — Legal Information Institute, Cornell Law School
- [3]Phasedown of Hydrofluorocarbons: Reconsideration of Certain Regulatory Requirements Promulgated Under the Technology Transitions Provisions of the AIM Act, 91 FR 31284 (May 26, 2026) — EPA, Federal Register
- [4]Public Law 119-21 (One Big Beautiful Bill Act), §§70202, 70301, 70505, 70507 — U.S. Government Publishing Office
- [5]FS-2026-13, Updates to questions and answers about the new deduction for qualified overtime compensation (August 2026) — IRS
- [6]Treas. Reg. §1.451-8 — Advance payments for goods, services, and certain other items — eCFR
- [7]26 U.S.C. §461 — General rule for taxable year of deduction (economic performance, §461(h)) — Legal Information Institute, Cornell Law School
- [8]26 U.S.C. §280F — Limitation on depreciation for luxury automobiles — Legal Information Institute, Cornell Law School
- [9]Rev. Proc. 2026-15 (2026 passenger automobile depreciation limits) — IRS
- [10]Treas. Reg. §1.274-5 — Substantiation requirements (qualified nonpersonal use vehicles, §1.274-5(k)) — eCFR
- [11]Treas. Reg. §1.471-2 — Valuation of inventories — eCFR
- [12]26 U.S.C. §471 — General rule for inventories — Legal Information Institute, Cornell Law School
- [13]26 U.S.C. §179D — Energy efficient commercial buildings deduction — Legal Information Institute, Cornell Law School
- [14]2026 General Instructions for Forms W-2 and W-3 — IRS
- [15]Frequent Questions on the Phasedown of Hydrofluorocarbons (Technology Transitions) — EPA
Figures and deadlines verified October 23, 2026
Send us your agreement terms and fleet list.
We’ll show you how agreement revenue, vehicles and inventory are being taxed today, what the 2026 rules change, and what an engagement would cost against the potential savings. If we don’t believe the math works in your favor, we’ll tell you before you engage.
Schedule Your Free Strategy Session