Content reviewed October 17, 2026 · Educational reference
Mechanics, the four parties, the deal chronology, and the taxation of each payment.
An SIS has four players. You (the seller) agree to be paid over time. At closing, the buyer funds the structured portion through an assignment company, which assumes the agreed payment duty and obtains an annuity or other permitted funding instrument. The seller receives the scheduled payments under the contracts; the buyer may retain fallback liability. Eligible principal payments carry gain and basis recovery under Form 6252, while interest is reported separately. Gain character depends on the asset, and a zero-basis sale has no basis-recovery component.
The four parties
| Party | What they do | Key point |
|---|---|---|
| Seller | Sells eligible property; negotiates installment terms; uses the installment method unless electing out and reports on Form 6252. | Receives contractually scheduled, insurer-funded payments; reports gain over time. |
| Buyer | Buys the asset; agrees to deferred-payment language; pays the price to the assignment company at closing. | Release is contract-specific; MetLife describes buyer fallback liability following assignment-company default. |
| Assignment company | Accepts the buyer’s obligation through a non-qualified assignment and obtains the contractually specified funding instrument. | Changes the primary payment counterparty; analyze assignment-company credit, funding, guarantees, and retained buyer liability. |
| Life insurer | Issues the annuity or funding agreement used to support the promised schedule. | Its claims-paying ability backs the income stream. |
The ten-step deal chronology
The defining requirement: the installment structure must be in place before the seller has any right to the cash — otherwise the seller is in constructive receipt and the deferral collapses.
- Negotiate the sale and agree that at least one payment will be received after the close of the tax year of sale.
- Engage an SIS specialist and the seller's tax advisor; design the payment schedule.
- Insert installment-sale language (an addendum) into the purchase agreement before closing.
- Assign the buyer's future-payment obligation to the assignment company in the documents.
- Buyer funds at closing — paying the assignment company rather than the seller.
- Assignment company accepts the obligation via a non-qualified assignment agreement.
- Assignment company obtains the annuity or funding agreement permitted by the product and sized to the schedule.
- Title transfers; the seller receives any agreed lump-sum portion (taxable in the year of sale).
- Insurer pays the seller the scheduled periodic payments for the chosen term.
- Seller reports gain annually on Form 6252 under the installment method.
The non-qualified assignment & constructive receipt
Two doctrines must be respected for installment treatment to survive:
- Constructive receipt. The seller must not have an unrestricted present right to the deferred cash. Contractual restrictions on access matter; nontransferability alone does not establish compliance.
- Economic-benefit doctrine. Analyze whether the seller receives a vested beneficial interest in a funded asset set aside beyond the obligor’s creditors. In the usual SIS architecture, the assignment company owns the funding instrument and the seller holds a contractual payment right. Ownership, security, creditor access, and guarantees require separate review.
Genuine illiquidity is a major tradeoff. Pledging an installment obligation can cause the loan’s net proceeds to be treated as a payment under §453A(d), to the extent that rule applies. Its $150,000 sale-price threshold and statutory exceptions matter; the $5 million interest-charge threshold is not a borrowing safe harbor. Other receipt and anti-abuse rules also require analysis.
Three-component taxation of each payment
| Component | How it is computed | Tax treatment |
|---|---|---|
| Return of basis | Payment principal × (1 − GPP) | Tax-free recovery of adjusted cost. |
| Capital gain | Payment principal × GPP | Character follows the sold asset: potentially capital gain, §1231 gain, or ordinary income; unrecaptured §1250 gain has a maximum 25% rate. |
| Interest / earnings | Per the seller’s installment obligation and applicable stated-interest, imputed-interest, and OID rules; not simply the funding asset’s return. | Ordinary income at the seller's marginal rate. |
Assume a sale for $1,000,000, basis of $200,000, no selling expenses or debt, and ten annual principal payments of $100,000 beginning after the sale year, plus adequate stated interest. Gross profit is $800,000 and GPP is 80%. Each principal payment contains $20,000 basis recovery and $80,000 gain. If a year’s separately computed interest is $8,000, that is additional ordinary income. If the same sale instead includes $150,000 of §1245 recapture, that amount is ordinary income in the sale year; installment-sale basis becomes $350,000 and the remaining $650,000 installment gain gives a 65% GPP.
Payment-design flexibility
Payment design begins with the seller’s goals: cash at closing, future living expenses, stepped amounts, or a balloon for a known need. Availability is product-specific. MetLife’s current SIS arrangements prohibit life-contingent payments; its traditional and Flex products have different start-date and funding rules. Do not infer that every carrier permits deferred starts, lifetime schedules, or indexed growth. Review any contractual death-acceleration election separately from a seller’s ability to demand cash. Beneficiary continuation also depends on the contract and does not erase deferred income tax.
For practitioners
Distinguish an ordinary purchaser note and permitted third-party guarantee under §453(f)(3) from receipt of a third-party obligation, a demand or readily tradable instrument, or an economic benefit in a funding asset. A guarantee is not automatically cash, and annuity funding is not automatically tax-safe. Analyze ownership, security, creditor access, demand rights, and the particular funding contract.
Sources: IRC §453 — installment method; Treas. Reg. §15a.453-1; IRS Publication 537 — Installment Sales; IRC §453A — interest and pledges.
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