Resources / SIS vs. deferred sales trust
Structured Installment Sale vs. Deferred Sales Trust: Key Differences
Both a structured installment sale and a deferred sales trust are often presented to sellers as ways to defer capital gains taxes at the time of sale. They share a surface similarity: the seller doesn't receive a lump sum, the gain is spread over time, and IRC §453 installment rules are invoked. But they are structurally different, and the difference matters enormously when it comes to IRS compliance risk, payment security, and what happens if the structure is challenged.
This article explains exactly how each works, where they diverge, and what questions any seller should ask before choosing between them.
How a structured installment sale works
In a structured installment sale, the transaction follows a straightforward path:
- The seller and buyer execute a standard purchase agreement with an installment sale addendum.
- At closing, the buyer assigns the payment obligation to a third-party assignment company (typically affiliated with a major life insurer). The buyer pays the assignment company in full.
- The assignment company purchases an annuity from a highly rated life insurance carrier to fund the seller's payment stream.
- The seller receives fixed, guaranteed payments from the carrier over the agreed schedule — typically 5 to 30 years.
- The seller has no control over, and no right to accelerate or redeem, the obligation. Each payment is recognized as income under IRC §453 when received.
The seller's position is simple: guaranteed income, no investment decisions, no access to the principal. The tax benefit comes from spreading the gain across years and into lower brackets.
How a deferred sales trust works
A deferred sales trust interposes a trust in the chain. The typical structure:
- The seller transfers the property to a trust (or the trust is party to the sale agreement) before or as part of the closing.
- The trust sells the property to the buyer. The trust receives the proceeds.
- The trust issues an installment note to the original seller. The note obligates the trust to make payments to the seller over time.
- The trustee invests the proceeds — in the market, in real estate, in other assets — at the trustee's discretion (subject to the trust document and fiduciary duty).
- The seller receives payments from the trust per the note terms and recognizes gain as payments arrive.
The theory is the same: the seller recognizes gain as installment payments are received rather than all at once. The difference is that the proceeds are sitting in a trust and being actively invested, rather than locked into an annuity.
Where they diverge: the five critical differences
1. IRS compliance posture
The structured installment sale rests on a direct, arms-length assignment of a buyer's obligation to an institutional company — the same basic mechanism used in structured settlements for decades. There is no self-dealing, no circular flow, and no trust controlled by a party related to the seller. The IRS has never successfully challenged a properly structured installment sale using this mechanism.
The deferred sales trust occupies more contested ground. Its validity depends on the trust being a genuine, independent party to the sale — the trustee must have real control over the assets, the note must be commercially reasonable, and the seller must have no ability to direct investments or accelerate payments. When these conditions are fully met, a DST can work under §453.
The IRS issued proposed regulations in 2023 (REG-109348-22) designating "monetized installment sale" transactions as listed transactions — requiring specific disclosure and exposing participants to penalties. While these regulations primarily target arrangements where the seller receives a loan back from the trust (collateralized by the installment note), any DST with structural features resembling monetization carries elevated scrutiny. A listed transaction designation triggers mandatory Form 8886 disclosure and potential substantial understatement penalties.
2. Payment security
In a structured installment sale, payments are backed by an annuity from a rated life insurance carrier. The seller's income is not affected by investment performance, market downturns, or trustee decisions. The payment amount, timing, and duration are fixed at closing.
In a deferred sales trust, payment security depends on the trust's investment performance and the solvency of the trust itself. If the trust invests in equities and the market falls 40%, the trust's assets may be insufficient to meet the note obligations. The trust note is typically unsecured — there is no insurance carrier guaranteeing the payment stream.
3. Investment flexibility
The DST's primary appeal is that the proceeds sit in a trust and can be invested. A sophisticated trustee can compound the pre-tax dollars across stocks, bonds, real estate, or private equity while the seller waits for payments. If the trust outperforms the annuity return, the seller effectively earns a return on the deferred tax dollars — a real economic benefit.
The structured installment sale offers no such flexibility. The annuity rate is fixed at closing; the seller earns a guaranteed but non-market-linked return on the deferred amount. For sellers who want the pre-tax dollars working in diversified investments, this is a meaningful limitation.
4. Liquidity
Neither structure provides ready access to a lump sum after closing without tax consequences. But DSTs sometimes include provisions allowing the seller to request a change in payment schedule, subject to trustee approval and within the terms of the note. This is structurally possible (though any arrangement giving the seller too much control over the trust assets invites IRS reclassification as constructive receipt).
The structured installment sale is more rigid — the payment schedule is set and the annuity is irrevocable.
5. Fees and complexity
DSTs typically involve ongoing trustee fees (often 1–2% of assets annually), legal fees to establish and maintain the trust, and investment management costs. Over a 15-year payment period on a $3M trust, these costs can exceed $500,000. The structured installment sale has a one-time setup cost embedded in the annuity pricing, with no ongoing management fees.
Side-by-side summary
| Factor | Structured Installment Sale | Deferred Sales Trust |
|---|---|---|
| Legal basis | IRC §453 direct assignment | IRC §453 via trust structure |
| IRS compliance risk | Very low — settled structure | Higher — scrutiny of trust independence; listed-transaction risk if improperly structured |
| Payment guarantee | Guaranteed by rated life insurer | Dependent on trust investment performance; unsecured note |
| Investment flexibility | None — fixed annuity | Yes — trustee invests proceeds |
| Liquidity post-close | Fixed schedule, no early access | Limited flexibility per trust terms |
| Ongoing fees | Embedded in annuity — no ongoing fees | Trustee + legal + investment fees (1–2%/yr+) |
| If structure is challenged | Very low probability; well-established precedent | Full gain + penalties + interest in year of sale if disallowed |
Which should you choose?
For sellers whose primary goal is tax reduction with maximum certainty and minimum compliance risk, the structured installment sale is the clearer choice. The payment stream is guaranteed by an insurer, the tax treatment is built on uncontested law, and there are no ongoing fees or trustee complexities.
For sellers who want the pre-tax dollars invested in a diversified portfolio and are willing to accept higher compliance complexity and investment-performance risk in exchange for potential upside, a properly structured DST with a truly independent trustee and no loan-back provisions may be worth considering — with independent legal review of the trust documents and the 2023 proposed regulations in mind.
In either case: get an independent CPA review of the structure before closing. The IRS consequences of a failed arrangement — full gain recognition in the year of sale, plus interest and potentially penalties — are severe enough that no amount of potential upside justifies skipping that step.
Frequently asked questions
What is a deferred sales trust?
A DST is a tax deferral structure where a trust acts as the seller of property, receives the proceeds, and issues an installment note to the original seller. The seller receives payments over time and recognizes gain under §453 as payments arrive. The trust invests the proceeds during the deferral period.
Is a deferred sales trust safe?
A properly structured DST with a genuinely independent trustee and no loan-back provisions can work under §453. The compliance risk is higher than a standard structured installment sale. Improperly structured DSTs — especially those where the seller retains control or receives a loan — are designated listed transactions under the 2023 proposed IRS regulations, requiring disclosure and exposing participants to penalties.
What is the main difference between a structured installment sale and a deferred sales trust?
A structured installment sale assigns the buyer's obligation directly to an institutional assignment company, which funds a guaranteed annuity. There's no trust, no investment management, and no ongoing fees — just guaranteed payments. A DST interposes a trust that invests the proceeds, offering more potential return but more compliance complexity and payment risk.
Want a straight answer on your situation?
Take our eligibility quiz and we'll tell you whether a structured installment sale fits your sale — and what we'd need to discuss about alternative structures.
Take the eligibility quiz →This article is for general education only and is not tax, legal, or investment advice. The IRS position on deferred sales trusts and monetized installment sales is evolving; the 2023 proposed regulations (REG-109348-22) have not been finalized as of June 2026. Any seller considering either structure should obtain independent legal and CPA review of the specific documents before closing.