PE offered you $4.8M — but $1.2M of it is a seller note at 6% over 5 years. Should you take it? The math is more complicated than it looks.
By the time you receive an LOI for your HVAC business, you've already done the hard work. But buried in the deal structure is a term that most sellers don't fully evaluate: the seller note. A seller note means you're not getting all-cash at close. You're agreeing to receive part of your purchase price over time — and you become the lender.
Seller financing in HVAC acquisitions is common — but it's rarely explained honestly to sellers. PE uses it to reduce upfront risk. Sellers can benefit (installment sale tax treatment, higher headline price) or get burned (buyer defaults, loss of recourse, no control post-close).
This is the honest breakdown you need before signing. It's the third post in the deal structure series: LOI → earnout → seller financing.
Section 1 — What Is Seller Financing in an HVAC Sale?
Seller financing (or a “seller carry”) means you agree to receive part of the purchase price over time, secured by a promissory note. Instead of the buyer paying 100% at close, you become a lender — the buyer owes you principal plus interest, paid out on a defined schedule.
It's common in three deal scenarios: the buyer wants to bridge a valuation gap without paying more upfront; the seller wants installment sale tax treatment; or PE is testing whether you're confident enough in your own numbers to carry some paper.
Seller Note
Fixed principal + interest paid over 3–7 years. Seller becomes a lender. Payment schedule is defined at close.
Earnout
Contingent on future performance. Seller takes operating risk. See how earnout structures work.
All-Cash
No deferred component. Highest certainty. Often the lowest headline price — but the highest real value.
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Calculate My Valuation →Section 2 — Why PE Offers Seller Notes
Understanding why PE proposes a seller note is the first step to negotiating it effectively. Every reason is in their interest, not yours. A broker experienced in PE deals knows how hard to push back.
Confidence signal
"If you believe in your numbers, you'll carry some paper." PE uses the seller note offer to test seller conviction. If you push back hard on the note, it signals you're not fully confident in your own projections.
Valuation bridge
Seller thinks the business is worth $5.5M. PE's model says $4.8M. A $700K seller note closes the gap — without PE overpaying upfront. If the business underperforms, they've paid less. If it performs, the note was cheap financing.
Debt service reduction
PE buys with leverage. Less cash paid at close means better debt coverage ratios on their acquisition debt — which makes their senior lender happier and their deal math work with less equity in.
Alignment
PE wants the seller engaged post-close during the transition. A seller note creates a financial incentive to stay helpful. You're still owed money, so you care about the outcome.
None of these reasons are in your interest. They're in PE's interest. That doesn't make seller financing bad — but you need to understand what you're trading before you sign.
Section 3 — The Math: What a Seller Note Is Actually Worth
The headline number on a seller note is not what you're actually receiving. Two adjustments reduce its real value: the time value of money and the interest rate gap between what you're earning and what PE is paying elsewhere.
$1.2M seller note — 6% interest — 5-year amortization
Here's the actual cash flow if you accept a $1.2M seller note at 6% over 5 years, paid annually:
$1.2M Seller Note — 6% Annual Rate — 5-Year Term
| Year | Payment | Interest | Principal | Balance |
|---|---|---|---|---|
| 1 | $278K | $72K | $206K | $994K |
| 2 | $278K | $60K | $218K | $776K |
| 3 | $278K | $47K | $231K | $545K |
| 4 | $278K | $33K | $245K | $300K |
| 5 | $278K | $18K | $260K | $0 |
| Total | ~$1.39M | ~$230K | $1.2M | — |
You receive ~$1.39M in total nominal cash — $190K more than the face value. But money received in Year 5 is not worth the same as money in hand today. At an 8% discount rate, the present value of those payments is approximately $1.04M — less than the $1.2M face value of the note.
The hidden cost: You're financing $1.2M at 6% — but PE's return hurdle on the acquisition is 20–25%. The gap between 6% and 25% is the real cost of the seller note. You are subsidizing their return.
Net proceeds comparison
How does the seller note compare to alternatives on the same $4.8M deal?
$4.8M Deal — Structure Comparison
| Structure | Upfront | Deferred | Total Nominal | PV at 8% |
|---|---|---|---|---|
| All-cash $4.8M | $4.8M | — | $4.8M | $4.8M |
| $3.6M cash + $1.2M note (6%, 5yr) | $3.6M | $1.39M nominal | $4.99M | ~$4.64M |
| $3.6M cash + $1.2M earnout | $3.6M | ~$800K prob-adj | ~$4.4M | ~$4.2M |
The seller note nominally pays more ($4.99M vs. $4.8M) — but its present value is less than all-cash. You're accepting $160K less in real value in exchange for a higher headline number. The earnout is even worse: probability-adjusted PV is roughly $600K below all-cash.
Section 4 — Tax Treatment: The One Real Upside
There is one legitimate reason to accept a seller note: installment sale treatment. When you receive payments over time, you spread the capital gains recognition across the note's life rather than recognizing the full gain in Year 1.
Example:
$4.8M deal. $1.5M cost basis. $3.3M taxable gain.
- → All-cash: Full $3.3M gain recognized in Year 1. ~$785K tax at 23.8% (20% LTCG + 3.8% NIIT).
- → Seller note: ~$660K gain recognized per year for 5 years. ~$157K tax per year.
- → Time value savings: Deferring $2.64M of gain saves approximately $50K–$80K in time value on the taxes.
The installment sale benefit is real but often overstated. It defers taxes — it doesn't eliminate them. And it only works if you actually receive the payments. See the full HVAC sale tax guide for a complete breakdown of how capital gains, entity type, and deal structure interact.
Section 5 — Default Risk: The Part Nobody Talks About
This is the most important section. PE-backed buyers rarely default on seller notes — but it happens, especially in roll-ups that overleverage. And when it does, reclaiming a sold HVAC company is operationally complex, legally expensive, and rarely the outcome you want.
If the buyer defaults, you may have a security interest in the business — but executing on it means re-acquiring an HVAC company you've already mentally exited, negotiating with a senior lender who has priority over your note, and spending $50K–$150K on legal fees to get there.
What to negotiate before you sign:
First-lien position on business assets
If possible, secure your note with a first-priority lien on business assets (equipment, vehicles, AR). In practice, the senior lender often has first lien — push for second at minimum. Check with the data room to confirm what assets the business holds.
Personal guarantee from PE sponsor
Rare, but worth asking for on notes above $500K. A personal guarantee from the GP (not just the acquisition vehicle) adds meaningful recourse if the business is sold or wound down.
Cross-default clause
If the buyer misses a payment on their senior acquisition debt, your note automatically accelerates. This is a critical protection — without it, you may not discover a problem until you stop receiving payments.
Financial reporting requirements
Quarterly P&L delivered to you during the note term. If the business is struggling, you want to know early — not when they miss a payment. Link your quarterly reporting requirement to your note agreement.
Acceleration on change of control
If PE sells the platform before your note is repaid, the full remaining balance becomes due immediately. Without this clause, you become a lender to an unknown new owner you never underwritten.
Note: having these protections requires documentation. A well-organized HVAC data room gives your attorney the asset schedules and financial records needed to draft meaningful security agreements quickly.
A seller note without security is an unsecured loan to a leveraged buyout. Treat it like one. Would you lend $1.2M unsecured to a company carrying 4–5x debt-to-EBITDA? That's what you're doing if you sign without protections.
Section 6 — When to Accept vs. Push Back
Seller financing isn't automatically bad. The question is whether the terms protect you — and whether you have options. If an earnout is already part of the deal, double-deferral (earnout + seller note) is almost always too much risk.
Accept if:
- Note is ≤15% of total deal value
- You're getting a premium headline price (≥0.5x higher than all-cash comp)
- You have first-lien security or personal guarantee
- Installment sale tax savings are material for your situation
- You trust the buyer's operating track record
Push back if:
- Note is >20% of total deal value
- No security interest offered
- Buyer has thin equity / highly leveraged cap table
- You need liquidity (estate planning, divorce, medical, reinvestment)
- Earnout is already part of the deal (double-deferral is too much risk)
Go / No-Go Decision Table
| Factor | Accept | Negotiate | Walk Away |
|---|---|---|---|
| Note size | ≤10% of deal | 10–20% of deal | >25% of deal |
| Security | First-lien or personal guarantee | Second lien with covenants | No security interest |
| Headline premium | ≥0.5x above all-cash comp | 0.25x–0.5x above | No premium at all |
| Tax benefit | Material savings (>$50K) | Modest savings | Minimal or no savings |
| Liquidity need | Not needed | Could wait 2–3 years | Needed at close |
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Get Your Free Score →Section 7 — Negotiating the Note Terms
If you've decided a seller note is acceptable, here's the tactical playbook for negotiating the terms:
Interest rate: push toward 8%
6–8% is current market. If the note is above $500K, 8% is the right starting ask. PE can afford it — and it meaningfully improves your PV. Don't leave rate on the table.
Term: 3 years preferred over 5
A shorter term reduces your default exposure window. Three years is common in the market; 5 years is long and creates more refinancing risk for them (which becomes collection risk for you).
Payment frequency: quarterly over annual
Quarterly payments catch financial problems 9 months before annual payments would. If the business is heading toward trouble, you want to know early — not at year-end.
Prepayment: allow without penalty
PE may want to retire the note early if they refinance or sell. Allow prepayment without penalty — it benefits you (reduces default exposure) and removes a friction point in negotiations.
Acceleration triggers: spell them out
Sale of business, insolvency, senior debt default. All three should accelerate your note automatically. Don't rely on generic language — list them explicitly in the note agreement.
Amortizing vs. balloon: know the difference
PE sometimes proposes interest-only payments with the principal due at maturity (balloon structure). This reduces PE's near-term cash burden — and increases your collection risk. If they can't refinance at maturity, you're waiting. Push for fully amortizing (principal paid monthly/quarterly from Day 1).
Full Valuation Report — $49
Know exactly what your HVAC business is worth before PE tells you
The Full Valuation Report gives you the deal-ready numbers — EBITDA, adjusted multiples, PE Readiness Score, and a deal structure checklist — so you can evaluate any offer with confidence.
- Your adjusted EBITDA calculation with addbacks
- Base multiple from current HVAC market comps
- PE Readiness Score breakdown (5 factors, line-by-line)
- Deal structure checklist: seller note, earnout, and accounting terms
- Estimated enterprise value range with scenario modeling
Frequently Asked Questions
How common is seller financing in HVAC acquisitions?
Seller notes of 10–20% of deal value are common in HVAC PE roll-up transactions. Notes above 25% of total deal value are unusual and warrant scrutiny — they suggest the buyer has difficulty financing the full purchase price or is transferring substantial risk to the seller.
Can I negotiate the interest rate on a seller note?
Yes — 6–8% is the current market rate for seller notes in HVAC PE deals. Larger notes (above $500K) justify pushing toward the 8% end of the range. You can also negotiate quarterly payments instead of annual, a shorter term (3 years vs. 5), and prepayment without penalty.
What happens to my seller note if the buyer sells the business?
Without an acceleration-on-change-of-control clause, the note stays with the new owner. If PE sells the platform to another buyer, you become a lender to an entity you don't know and didn't underwrite. Always negotiate an acceleration clause: if the business is sold, your note becomes due in full.
Is a seller note better than an earnout?
Generally yes — a seller note is fixed principal plus interest, paid on a defined schedule. An earnout is contingent on performance targets you don't fully control. A seller note with security is more predictable and more certain than a performance earnout. That said, both reduce the value of your deal compared to all-cash at close.
OffRamp is a free valuation tool for HVAC business owners. We don't sell your information, represent buyers, or work on commission. The calculator and reports are educational tools — always consult a licensed M&A advisor before entering a sale process.