Why a wrap seller should price the payoff window into the note before it is written

The three structures you named each do something different, so it is worth being clear on what a beginner would need to know before they even reach that choice.

A prepayment premium (also called a prepayment penalty) is a fee the borrower pays if they pay off the loan early. On a wrap note, it compensates the seller for the income they expected but will not receive.

Your three options work like this:

Fixed penalty percentage. The buyer pays a set percentage of the remaining balance, say 3%, whenever they exit. Simple to explain and enforce, but it does not scale to how much yield the seller actually loses. A payoff in year two and a payoff in year eight cost the buyer the same percentage even though the seller loses very different amounts of spread.

Yield maintenance clause. This one calculates the exact present value of the spread income the seller will miss. It is the most precise protection, and it is also the most complicated to draft and for a buyer to understand. A tax or real estate attorney needs to write it, and a buyer who does not understand what they signed tends to dispute it later.

Step-down schedule. The penalty percentage shrinks over time, for example 5% in years one and two, 3% in years three and four, 1% in year five, then zero after that. It is the most common structure in seller-financed notes because both sides can see exactly what the cost of early exit is at any point. The seller loses some protection in later years, but the simplicity tends to mean fewer disputes.

One thing worth raising: whatever structure you choose, the clause also has to account for what happens to the underlying loan at payoff. A real estate attorney who works with seller-financed notes should review the wrap note before it is signed.

Which year do you expect the buyer is most likely to refinance, and is the underlying loan assumable or not? That changes which structure gives you the most practical protection.

The piece most sellers miss before writing the note is figuring out what the underlying loan actually costs them to carry if the spread disappears early. On a 280k wrap with a 3.5 percent underlying, the seller is probably servicing somewhere around 200k to 220k in underlying debt. If the buyer exits in year four and the seller cannot immediately redeploy that payoff into another instrument at 7 percent or better, the opportunity cost is real and compounding. Yield maintenance captures this most precisely because it forces the buyer to make the seller whole on the present value of the remaining spread, not just pay a flat penalty against a principal balance that has been shrinking. A fixed penalty percentage punishes the buyer the same whether they exit in month six or year eight, which means it overpunishes early and underpunishes late relative to actual yield loss. A step-down structure is the seller-friendly middle ground when you expect the buyer to season two or three years before refinancing, because you can set the penalty high in years one through three and let it run to zero after year seven, which matches the refinance probability curve without making the note unmarketable.

The checklist a careful seller runs before signing: confirm whether the underlying loan has a due-on-sale clause and whether your state treats a wrap as a transfer that triggers it, because a called underlying loan ends the spread math entirely regardless of your prepayment structure. Verify that your wrap note specifies which party bears the risk if the underlying servicer changes terms on an adjustable rate product. Make sure the prepayment premium survives a bankruptcy filing by the buyer, which requires language that characterizes it as liquidated damages rather than a penalty, since courts sometimes void penalty clauses but enforce liquidated damages provisions. Confirm that the note spells out the calculation method for yield maintenance in arithmetic terms, not by reference to a

The risk nobody has priced here is the underlying lender's due-on-sale clause, which does not care what the wrap note says about prepayment. If the underlying lender calls the loan when they discover the transfer, the prepayment premium becomes uncollectable because the note terminates under duress rather than borrower election, and a court may not enforce the penalty in that posture.

Of the three structures, step-down is the most defensible in that scenario because it concentrates protection in the early years when due-on-sale exposure and refinance temptation overlap, and it gives a buyer a visible exit ramp that reduces the incentive to find a workaround.

What is the underlying loan, a conventional Fannie/Freddie note or a portfolio loan, because that changes how seriously to treat the due-on-sale risk before you finalize any prepayment language?

The step-down is the most common choice and also the most seller-hostile when the underlying carries a sub-4 percent rate, because the penalty shrinks precisely as the buyer's refinance incentive grows. On a 280,000 wrap, a buyer who can exit at year four into a 6.5 percent market loan still saves enough on the spread to absorb a 3 or even 4 percent penalty and come out ahead, so the step-down did not actually deter early exit, it just set a floor on how much arbitrage the buyer keeps. Yield maintenance solves that by calculating what the seller would have earned on the remaining term and making the buyer whole for it, but it requires a discount rate written into the note at origination, and most sellers do not know what number to use or how to verify the calculation later. The checklist a careful seller runs before the note is signed: confirm whether the underlying has its own prepayment penalty and how that interacts with a lump payoff, define the discount rate in the yield maintenance clause explicitly rather than by reference to a market index the seller cannot control, specify whether partial prepayments trigger the premium or only full payoff, and decide whether the premium survives a sale of the wrapped property to a third party. What does the underlying note say about due-on-sale and acceleration on payoff, because that clause can force the seller's hand before any prepayment structure gets a chance to operate?

Yield maintenance is the most precise tool here, because it makes the seller whole on the present value of the lost spread regardless of when the exit happens, but it requires you to define the discount rate in the note itself before closing or a dispute about the calculation is almost guaranteed. The checklist a careful seller runs: confirm the underlying has no due-on-sale clause that a payoff event could trigger, write the prepayment calculation method in plain arithmetic in the note rather than by reference to a formula, specify whether partial prepayments reset the step-down clock or run independently, and get the note reviewed by a real estate attorney in the state where the property sits because some states cap or restrict prepayment premiums on residential instruments.

The step-down is easier to explain to a buyer and easier to enforce, but it leaves a gap: a buyer who refinances in month thirteen of a twelve-month penalty window pays nothing extra, and the seller absorbed the full rate risk of the underlying for a year with no compensation for the optionality the buyer held. On a 280,000 note at a 3.5-point spread, that is roughly 9,800 dollars in foregone spread plus the cost of originating a replacement deal.

What is the remaining term on the underlying, and does it have a balloon that might force the buyer's hand before the wrap note matures anyway?

The yield maintenance clause solves the income shortfall most exactly, but it introduces a calculation the buyer can contest at payoff, and if you are the seller acting as lender without counsel on the note language, that dispute can stall or kill the closing. A fixed penalty percentage, say five percent of outstanding principal in years one through three stepping to three percent in years four and five then zero, is easier to enforce and easier for the buyer to underwrite at origination, which matters when you are trying to close the deal in the first place. The assumption doing the most work in the original framing is that the buyer will refinance when rates drop enough to make it economic, but the other scenario is rates stay elevated and the buyer holds the wrap past the step-down window, meaning the seller gave up the prepayment protection for free. Before writing any of these structures into the note, confirm with a real estate attorney in your state that the prepayment clause survives if the underlying has a due-on-sale clause that gets called, because the enforcement sequence matters if both events happen close together.

What is the underlying loan balance relative to the wrap note, and does the underlying lender know about the wrap?

Step-down is what most retail wrap sellers default to because it is familiar from conventional lending, but a step-down that expires after year five on a ten-year note does nothing if the buyer waits you out and refi's in month 61.

What is the underlying balloon date on that 3.5 percent loan, because if it matures before year ten the whole conversation changes and you are not really pricing a ten-year income stream anyway.