When SBA rates hit 10.5% and the citizenship rule eliminated a generation of buyers, the deal structure that used to be a last resort became a first choice.
You already know seller financing in HVAC deals is common. Most of the time, though, it’s a supporting player — the seller carries 10–20% while an SBA loan does the heavy lifting.
This article is about the other version. The one where no bank touches the deal. The seller is the lender. The buyer writes one check and signs one note. No SBA underwriting, no 90-day approval timeline, no guarantee fees.
Full seller-carry used to be the backup plan. In 2026, it’s a first-choice strategy for a growing number of HVAC acquisitions — and if you understand why, you’ll negotiate a better deal whether you’re buying or selling.
Why This Deal Structure Exists
Three forces pushed full seller-carry from “unusual” to “increasingly common.”
SBA money got expensive. The SBA 7(a) rate in 2026 sits between 9.5% and 11.75%, depending on the lender and your credit profile. On a $1.5M loan, that’s $150K+ more in interest over the life of the note compared to 2021 rates. That’s not a rounding error — that’s a service van, a new hire, and a year of marketing.
The citizenship rule changed everything. In March 2026, SBA eliminated green card holders and all non-citizens from the 7(a) program. An entire generation of qualified buyers — people who’ve been running HVAC crews for a decade — suddenly had no path to traditional financing. Seller-carry didn’t just become attractive. It became the only option.
The market was already moving this way. Roughly 80% of small business sales involve some form of seller financing. Full-carry is the logical extension when the buyer is experienced, the seller wants tax deferral, and both sides agree that paying a bank $100K+ in fees and interest premium doesn’t make the deal better.
This isn’t a last resort. For the right buyer and seller, it’s the best deal structure available.
How a Full Seller-Carry Deal Works
Strip it down and here’s the mechanic:
- Seller provides 100% of the purchase price as a promissory note
- Buyer makes a cash down payment — typically 20–30% of the purchase price. Cash, not borrowed money
- Remaining balance carried by seller at a negotiated interest rate and term
- No bank underwriting. No SBA equity injection rules. No collateral assignment to a third-party lender
- Security: UCC-1 filing on all business assets, plus a personal guarantee from the buyer
The seller becomes the bank. The buyer makes monthly payments directly to the seller (or through an escrow service). When the note is paid off, the UCC lien releases and the buyer owns the business free and clear.
Closing can happen in 30–45 days. Try that with an SBA lender.
The Math: Full Seller-Carry vs. SBA 7(a)
Let’s run a real comparison on a $2M HVAC acquisition. Same company, same buyer, two different structures.
SBA 7(a) Route
- Purchase price: $2,000,000
- Equity injection (10%): $200,000 from buyer
- SBA loan: $1,800,000 at 10.5%, 10-year term
- Monthly debt service: $24,267
- Total interest paid: $1,112,040
- SBA guarantee fee (on a $1.8M loan): $59,400
- Bank closing costs and legal: ~$25,000
- Total cost of financing: ~$1,196,440
Full Seller-Carry Route
- Purchase price: $2,000,000
- Down payment (25%): $500,000 from buyer
- Seller note: $1,500,000 at 7%, 7-year term
- Monthly debt service: $22,630
- Total interest paid: $400,920
- SBA guarantee fee: $0
- Bank closing costs: $0
- Total cost of financing: ~$400,920
The buyer saves $795,520 in total financing costs. Monthly payments are actually $1,637 lower. And the buyer put up $300K more at closing — but that money went to the seller, not to a guarantee fee and bank overhead.
What the Seller Gets
The seller isn’t doing charity here. They get:
- Higher effective sale price. Buyers will pay a 5–10% premium for favorable terms. A $2M company might sell for $2.1M with full seller-carry because the total cost to the buyer is still lower
- $400,920 in interest income over 7 years on top of the purchase price
- Installment sale tax deferral under IRC §453 — capital gains spread over the payment period instead of hitting all at once
- A note secured by a business they know. The seller understands this company’s cash flow better than any bank ever will
Run the HVAC acquisition math on your own deal. The spread between SBA and seller-carry financing costs is almost always significant.
When Full Seller-Carry Makes Sense
Not every deal should be structured this way. But these scenarios are where it shines.
Seller wants tax deferral. Installment sale treatment under IRC §453 spreads capital gains recognition across the payment period. A seller who takes $2M at closing could owe $400K+ in federal and state capital gains tax that year. Spread across 7 years, they might stay in a lower bracket each year and keep more total.
Seller trusts the buyer’s industry experience. The classic case: a lead tech or service manager buying their boss’s company. The seller has watched this person run the business for years. They don’t need a bank to validate what they already know.
Buyer doesn’t qualify for SBA. Non-citizen. Credit hiccup from a divorce three years ago. Insufficient time in business ownership. The SBA citizenship-only rule alone eliminated tens of thousands of qualified buyers. Seller-carry has no citizenship requirement, no credit score minimum, no bureaucratic gatekeeping.
Seller is motivated and the market is slow. When a seller has been listed for 12+ months and a serious buyer shows up with 25% down and a decade of HVAC experience, the terms get flexible. Buyer leverage on rate and term is strongest when the seller needs to move.
The deal is under $3M. Below this threshold, institutional lenders don’t compete aggressively. The SBA process is the same whether you’re borrowing $500K or $5M, but the fees and friction hit harder on smaller deals. Full seller-carry eliminates all of it.
When It Doesn’t Work
Be honest about these deal-killers before you spend money on attorneys.
- Seller needs cash at closing. Medical bills, divorce settlement, estate distribution, buying their next business — if the seller needs the full purchase price in hand on Day 1, seller-carry is off the table
- Seller is elderly or in poor health. A 75-year-old seller may not want to wait 7 years for full payment. Their estate planning attorney will likely object. Life happens
- Buyer has no down payment. Sellers need 20–30% skin in the game. Without it, the default risk is too high. No down payment means no alignment of incentives. If you need to explore alternative financing options beyond SBA, start there
- Multiple heirs who disagree. When three siblings inherit Dad’s HVAC company and one wants cash, one wants to keep it, and one wants to sell but only above market — seller-carry negotiations collapse under the weight of family dynamics
Structuring the Note: What Goes in the Promissory Note
The promissory note is the entire deal. Every important term lives here. Get this wrong and you’ll spend more on litigation than you saved by avoiding a bank.
Principal and interest rate. The current sweet spot for HVAC seller-carry notes is 6–8%. This needs to be above the IRS Applicable Federal Rate (AFR) — otherwise the IRS imputes interest and the tax treatment gets ugly. Below SBA rates, above AFR. That’s your window.
Term. 5–10 years. Seven years is the most common for HVAC deals because it balances monthly payment size against the seller’s patience. Shorter than 5 years creates cash flow strain on the buyer. Longer than 10 and the seller starts wondering if they’ll see the money.
Amortization schedule. Two options:
- Fully amortizing: Equal monthly payments for the full term. Clean, predictable, no surprises. This is what most buyers should push for
- Balloon payment: Lower monthly payments with a lump sum due at the end (typically Year 5 or 7). Risky for the buyer — you’re betting you can refinance or have the cash when the balloon hits
Collateral. UCC-1 filing on all business assets — vehicles, equipment, customer lists, trade name. Some sellers also require a personal guarantee. This is standard. Don’t fight the PG; negotiate the scope instead.
Default provisions and cure period. The note should specify 30–60 days written notice before the seller can accelerate (call the full balance due). This cure period protects the buyer from a single late payment triggering catastrophe. According to AEGIS Law, clearly defined default and remedy provisions are the single most litigated element in seller-financed deals.
Financial covenants. Sellers may require:
- Minimum revenue thresholds
- Insurance maintenance (general liability, workers’ comp, vehicle)
- Debt service coverage ratio (DSCR) above 1.25x
- Notification before taking on additional debt
Prepayment rights. Negotiate the right to prepay without penalty after Year 2. Sellers sometimes want a prepayment penalty to protect their interest income stream. Two years is a fair compromise — it guarantees the seller meaningful interest income while giving you flexibility.
The Purchase Agreement Provisions That Protect Both Sides
The promissory note handles the money. The purchase agreement handles everything else. Both documents work together. Neither is optional.
Seller’s security interest. Documented through a UCC-1 filing with the state. This puts the world on notice that the seller has a lien on the business assets until the note is paid. Morgan & Westfield’s guide covers the mechanics of this filing in detail.
Buyer’s right to operate. Critical: the buyer runs the business without seller interference. The seller is a creditor, not a co-owner. If the seller wants veto power over hiring decisions or pricing changes, that’s a management consulting agreement — negotiate it separately.
Non-compete clause. Standard terms: 50-mile radius, 5 years. Without this, the seller could take the down payment, wait for the buyer to default, reclaim the business, and start over. It happens. The non-compete prevents it.
Financial reporting obligations. Expect quarterly financial statements to the seller for the life of the note. Annual tax returns. This is reasonable — the seller has a right to monitor the health of their collateral. Monthly reporting is excessive. Push back on it.
Default remedies. The seller can accelerate the note (demand full payment). They cannot typically seize the business without judicial process. Understand the difference — acceleration and foreclosure are two different legal actions in most states.
Escrow agent for note servicing. Worth every penny. A neutral third party collects the buyer’s monthly payment and distributes it to the seller. Removes the awkwardness of writing a personal check to your former boss every month. Also creates a clean payment record if there’s ever a dispute.
Tax Implications for the Seller
This is where full seller-carry gets genuinely attractive for sellers — and where bad advice gets expensive.
IRC §453 installment sale treatment. When a seller finances the deal, capital gains are recognized proportionally as payments are received. Not all at once.
Here’s the difference on a $2M sale where the seller’s cost basis is $200K:
- Lump-sum sale: $1.8M in taxable gain in Year 1. At 20% federal capital gains + 3.8% NIIT + state tax, the seller could owe $475K+ in taxes that year
- Installment sale over 7 years: ~$257K in gain recognized per year. Potentially keeps the seller in a lower bracket. Total tax may be the same or less, but the cash flow impact is dramatically different
Interest income is ordinary income. The interest the seller collects on the note is taxed at ordinary income rates, not capital gains rates. On a $1.5M note at 7%, that’s roughly $57K in interest income in Year 1 alone. Factor this into the seller’s total tax picture.
Consult a CPA. Seriously. Installment sale planning is where a good tax advisor pays for themselves ten times over. The interaction between §453, depreciation recapture under §1245, and state tax rules is complex enough that generic advice is dangerous.
Resources like Lendesca can help you compare your financing options side-by-side — understanding the full landscape before you negotiate puts you in a stronger position.
How to Protect Yourself as the Buyer
The SBA’s standby seller note rules exist for a reason — they were designed to protect both parties in deals involving seller financing. Even without SBA involvement, adopt the same discipline.
Get a quality of earnings report. Before you sign a note for $1.5M, spend $8K–15K on a QofE. You’re about to become the lender’s only customer. Make sure the business can support the payments.
Build a cash reserve before closing. Six months of debt service plus operating expenses. On a $22K/month note with $80K/month in operating costs, that’s $612K in reserve. If you don’t have it, you’re one slow January away from default.
Hire your own attorney. Not the seller’s attorney. Not a general practice attorney who “also does business law.” An M&A attorney who has closed seller-financed deals. This costs $10K–20K. It will save you $200K in problems you didn’t see.
Negotiate a transition period. The seller should stay on for 60–90 days post-closing to introduce you to key customers, vendors, and the dispatcher who actually runs the place. Build this into the purchase agreement, not a handshake.
FAQ: 100% Seller-Financed HVAC Acquisitions
Can you buy an HVAC company with no bank financing?
Yes. Full seller-carry structures work and are increasingly common in HVAC deals under $3M. The seller provides 100% of the purchase price as a promissory note, the buyer makes a cash down payment (typically 20–30%), and monthly payments go directly to the seller. No bank, no SBA, no guarantee fees.
What interest rate is typical for a seller-financed HVAC deal?
In 2026, the typical range is 6–8%. The rate must be above the IRS Applicable Federal Rate (currently around 4.5% for mid-term notes) to avoid imputed interest issues. Most deals land at 7%, which is meaningfully below the 9.5–11.75% range for SBA 7(a) loans.
What down payment does the seller usually require?
Standard is 20–30% of the purchase price in cash. Below 20%, the seller’s default risk increases significantly and most experienced sellers won’t agree to it. On a $2M deal, expect to bring $400K–600K to the table.
Is seller financing safer than SBA for the buyer?
Different risks, not necessarily lower. With seller financing, there’s no SBA personal guarantee — but the seller still has foreclosure rights through the UCC filing. The upside: you’re dealing with one person who understands the business, not a bank’s loss mitigation department. The downside: if the relationship with the seller deteriorates, payment disputes get personal fast. An escrow agent solves most of this.
Can a non-US citizen buy an HVAC business with seller financing?
Yes. Seller financing has no citizenship requirement, no immigration status check, no residency minimum. This is its single biggest advantage since the March 2026 SBA rule change. If you’re a green card holder, visa holder, or permanent resident who doesn’t qualify for SBA, seller-carry is your path.
What happens if the buyer defaults on a seller-financed note?
The seller can accelerate the note (demand full payment of the remaining balance). If the buyer can’t pay, the seller can pursue foreclosure through the courts to reclaim the business assets. This is a judicial process — the seller can’t just change the locks. The cure period in the note (typically 30–60 days) gives the buyer time to fix the problem before acceleration.
The Bottom Line
Full seller-carry isn’t a consolation prize. It’s a deal structure that saves the buyer hundreds of thousands in financing costs, gives the seller tax deferral and interest income, and closes faster than any bank-financed deal.
The catch is trust. Banks exist because strangers don’t lend each other $1.5M on a handshake. When you remove the bank, you need legal documents that are twice as good and a relationship between buyer and seller that can survive 84 monthly payments.
If you’ve got the down payment, the industry experience, and a seller who’d rather earn 7% on a business they know than dump the proceeds into a bond fund — this deal is waiting for you.
Get the right attorney. Run the math. And stop assuming you need a bank’s permission to own what you’ve been running for the last ten years.