Seller Note risk architecture — subordination, mezzanine, tax treatment.

Seller notes occupy the mezzanine layer — above equity but below the bank. In the 2026 environment, this positioning must be priced as subordinated debt, not as a favor to the buyer. The architecture sits outside the note itself: the subordination agreement, the payment blockage provisions, the PIK structures, and the tax treatment that determines whether the structure makes economic sense at all.

§ 01 · The capital stack and mezzanine positioningAbove equity, below the bank.

Typical seller-financed agency deal stack: Senior Bank Debt 60–75% (first lien on all assets, 70–90% recovery). Seller Note 10–30% (stock pledge subordinated to bank, 0–10% recovery if unsecured, 20–40% if secured). Buyer Equity Injection 10–20% (no security, equity risk, 0% recovery).

The seller note sits in the mezzanine layer. In the 2026 environment (Prime at 7.5–8.5%), this positioning must be priced as subordinated debt. A 4–6% rate on a mezzanine-positioned instrument is a subsidy; 7–9% is the market-appropriate yield.

§ 02 · The Hope Note trapThree missing protections.

A seller note becomes a "Hope Note" when it lacks three critical protections. No security — the note is unsecured, with no stock pledge or UCC-1 filing. Deep subordination — the bank's subordination agreement allows unlimited payment blockage. No cross-default — the buyer can default on the bank loan while the seller note remains technically "current."

In this configuration, the seller has no legal standing to act, no collateral to seize, and no enforcement trigger. The seller simply hopes the business succeeds enough to pay them after the bank takes its share. Hope is not a legal remedy.

§ 03 · Subordination Agreement mechanicsThe bank overrides the note.

The Subordination Agreement (or Intercreditor Agreement) between the seller and the buyer's bank overrides the promissory note. Regardless of what the note says about payment terms, the subordination agreement dictates if and when the seller actually gets paid.

Payment Blockage. The most dangerous provision. If the buyer trips a financial covenant (DSCR drops below 1.25×), the senior lender can unilaterally block all payments to the seller note — even if the buyer has cash, even if the buyer wants to pay. "Deep subordination" agreements allow for unlimited blockage periods. The fix: negotiate specific protections. Blockage cap — maximum 180 days per year. Permitted payments — interest payments allowed as long as senior loan is not in payment default. Escalation trigger — after 180 days the buyer must pay both bank and seller, or the bank accelerates.

Standstill Periods. In a default scenario, the subordination agreement imposes a Standstill Period — typically 180 to 365 days — during which the seller is legally paralyzed. Cannot sue, cannot foreclose, cannot accelerate. Cap the standstill at 180 days; 365 gives the bank a full year to strip value before the seller can act.

§ 04 · Payment structures — Cash-Pay, PIK, BalloonThe risk math.

Cash-Pay (Standard). Interest and principal paid monthly or quarterly. The gold standard for seller liquidity and risk reduction — actual cash flow plus an early-warning indicator on payment consistency.

PIK (Payment-in-Kind). Interest compounds into principal rather than being paid in cash. Common in PE-backed deals to preserve buyer cash flow. The risk math: the seller receives $0 cash while exposure grows. A $1M note at 8% PIK becomes $1.17M after 2 years and $1.26M after 3 years. Defenses: demand a rate premium (+1–2%) for PIK versus cash-pay, cap the PIK period at 12–24 months, insist on a 9%+ rate to compensate for deferred liquidity.

Balloon Payments and Refinancing Risk. Notes sometimes amortize over a long period (10 years) but mature in a shorter period (5 years), requiring a massive lump sum at maturity. If credit markets are tight at Year 5, the buyer may not be able to refinance. The buyer defaults not because the business failed but because capital markets won't cooperate. Mitigation: prefer fully amortizing notes. If accepting a balloon, negotiate a 6-month extension option at a higher rate (+2%) and a conversion right to a fully amortizing note if the balloon cannot be paid.

§ 05 · Recovery math and tax treatment10–15% gain savings through IRC §453.

Recovery math. If the deal implodes and the buyer goes bankrupt: senior secured bank 70–90 cents on the dollar; seller with perfected stock pledge 20–40 cents on the dollar (depends on residual agency value); unsecured seller 0–10 cents; equity holders $0. The stock pledge materially improves recovery versus unsecured status — but does not eliminate loss. The rate (7–9%) is compensation for this irreducible residual risk.

Tax treatment — IRC §453 Installment Sale. If the sale qualifies under IRC Section 453, the seller does not pay capital gains tax on the entire gain in the year of sale. Instead, gain is spread across the years payments are received. Comparison: all-cash sale at $5M with $3M gain triggers approximately $600K of federal tax (20%) plus NIIT exposure in Year 1 — a full tax spike. An installment sale ($3M cash plus $2M note over 5 years) on the same $3M gain triggers approximately $360K in Year 1 with the remainder spread over 5 years — lower brackets, reduced NIIT, total savings of 10–15% of the gain.

Key benefits. Avoids bracket creep by spreading gain recognition. Reduces exposure to the 3.8% NIIT for high earners. Allows tax planning flexibility across multiple years. Interest income on the seller note is taxed as ordinary income (separate from capital gain).

◆