A structured installment sale is an ordinary installment sale — a sale in which the seller receives part of the price over time rather than all at closing — with one engineering step added. Instead of the buyer owing the seller those future payments, a third-party assignment company takes over the future-payment obligation at closing and funds it, typically by purchasing an annuity from a rated life insurer. The seller then receives a fixed, scheduled stream from that funded arrangement.

The seller's motive is tax deferral: by receiving the price over several years, the seller spreads the gain across those years instead of recognizing it all in the year of sale. That is the seller's reason to ask for it. None of it depends on, or alters, how the purchase is financed.

From your side of the table, the useful mental model is this: the SIS lives entirely on the proceeds side of the settlement statement. It affects where money goes after the price is satisfied. It does not touch the loan, the borrower's obligations to you, or the property securing your debt.

You will usually first encounter an SIS not as a loan term but as a feature of the purchase contract. A seller who wants the structure negotiates it into the purchase agreement (or an addendum) before closing. By the time the file reaches you, the deferred-payment terms are already part of the deal documents the seller and buyer have agreed to.

The trigger point

The SIS becomes visible in the lending process at the document-review and closing-coordination stage — when counsel or the closing agent assembles the settlement package and sees (a) installment language in the purchase agreement, and (b) an assignment/acceptance document the buyer will sign at closing. That second document is the one that prompts the natural lender question: why is my borrower signing something that looks like an installment obligation? Section 5 answers that.

Timeline and lead time

An SIS needs modest advance setup — the assignment company and the funding (annuity) quote have to be arranged before closing so the figures are fixed when the settlement statement is cut. In practice this is coordinated by the seller's advisors and the closing agent. It can add a short amount of lead time to scheduling a closing, but it does not add steps to your loan process: no new loan documents, no change to the note, deed of trust/mortgage, or guaranty package.

Here is the entire operational difference, in a single picture. In a conventional closing, escrow disburses the seller's net proceeds to the seller. In an SIS closing, escrow disburses a defined portion of those proceeds to the assignment company (to fund the seller's payment stream) and the remainder to the seller as usual.

Two points follow directly from this picture, and they matter for the lending file:

• The price is fully paid at closing. From the buyer's and lender's standpoint, the full consideration leaves escrow at closing. Nothing about the price is left "owed" by the buyer afterward.
• Loan dollars are fungible. It is immaterial whether the funds that ultimately reach the assignment company trace to the buyer's equity or to loan proceeds. Money is fungible in escrow; the SIS is a characterization of the seller's proceeds, not an earmarking of the lender's advance.

Nothing in this section is affected by an SIS — which is precisely the point worth stating plainly so it can be checked off and set aside.

• Title and conveyance: the deed transfers to the buyer at closing exactly as it would otherwise.
• Your lien: your deed of trust / mortgage records in the same position it would occupy in a cash-or-conventional purchase. The SIS creates no competing security interest.
• No seller lien: the seller does not retain a security interest in the property. The seller's future payments come from the funded assignment, not from a lien against your collateral.
• Guaranties and guarantors: unchanged. The SIS does not alter who guarantees the loan or the terms of those guaranties.
• Recording: there is no SIS instrument that records against title and clouds your priority.
• Title insurance: your loan title policy is unaffected — because nothing is recorded for the SIS, it raises no new title exception, requirement, or endorsement.

Sales price, value & LTV

An SIS is not a price concession, and this is worth stating directly because it is the input your credit decision rests on. The buyer pays the full contract price; the seller simply elects to receive part of its own proceeds over time. Three consequences for the file:

• No price reduction or discount. The contract price your appraisal and loan-to-value are built on is unchanged. The SIS does not net down the price or create a hidden lower "real" price.
• Not a seller concession or inducement to purchase. The seller is disposing of its own proceeds, not contributing value to the buyer — so the SIS is not an interested-party contribution and consumes no concession allowance.
• No effect on underwritten value. Appraised value, LTV, and the price the deal is sized on are all what they would be without the SIS.

This is the section that resolves the one document that gives lenders pause. At closing the buyer signs an assignment under which the assignment company assumes primary responsibility for the future-payment obligation as co-obligor. The buyer is not released: its original obligation to the seller remains in place as a fallback, and the seller agrees to look to the buyer only if the assignment company defaults. The signature is how primary responsibility for the obligation is placed on the assignment company — it does not create a new liability on the buyer, and it does not leave the buyer with a payment stream to the seller.

What the buyer carries forward — and what it does not

• Primary responsibility sits with the assignment company. Once the assignment company accepts the obligation and it is funded at closing, the assignment company — not the buyer — is the party the seller looks to for every scheduled payment. The buyer makes no payments to the seller in the ordinary course.
• The buyer retains fallback liability. The assignment company's obligation is in addition to, not in substitution of, the buyer's. If the assignment company defaults, the seller may look to the buyer on the original obligation. That liability is contingent and unsecured — no lien, no recorded instrument — and the assignment company's own obligation is funded at closing through an annuity issued by a regulated life insurer. Read the assignment and sale documents to confirm the recourse sequence; funding alone does not establish a release.
• No payment stream to underwrite. There is no scheduled buyer payment to the seller that competes with debt service. The fallback liability is a contingent obligation, not a recurring payment; treat it as you would any contingent, unsecured exposure disclosed in the file, with the knowledge that it is triggered only by an assignment-company default.

This is the distinction most worth internalizing, because seller financing is the thing lenders are trained to scrutinize — and an SIS is structurally the opposite of it on every axis a lender cares about.

The reason every cell differs is the funding step. In seller financing, the seller is the lender of the deferred portion and looks to the buyer (and usually to a lien) to get paid. In an SIS, the deferred portion is funded at closing and the seller looks to the assignment company as primary obligor. The buyer is out of the payment chain in the ordinary course — it retains only a contingent fallback liability — so there is no seller-financing note, no seller lien, and no second creditor to coordinate with.

Because the SIS sits outside the loan and outside your collateral, default scenarios resolve the same way they would on a conventional loan — and in one respect more cleanly.

If the borrower defaults on your loan

Your remedies are unaffected. You foreclose or pursue the note and guaranties exactly as you otherwise would. The seller's SIS payments are not part of this picture: they were funded at closing through the assignment and do not depend on the buyer's continued performance. There is no seller lien to clear and no seller as a competing creditor in the workout.

What happens to the seller's payments if the buyer defaults

Nothing. The seller's stream is independent of the buyer. A post-closing buyer default — on your loan or otherwise — has no bearing on whether the seller continues to receive the scheduled payments, because those payments come from the funded assignment, not from the buyer.

The SIS behaves the same way regardless of asset class, because in every case it touches only the seller's proceeds. The table notes the one context-specific item worth a glance in each lane.