How a Wraparound Mortgage Works

Published August 4, 2026

A wraparound mortgage is a seller-financed note written for the full amount the buyer still owes on the property, while the seller’s existing loan stays exactly where it is — same lender, same balance, same monthly payment, still in the seller’s name. The buyer pays the seller. The seller pays the underlying lender out of what the buyer sent. The new note “wraps around” the old one, which is where the name comes from.

That is the entire structure. Everything else about a wrap — the spread, the equity build, the risk, the bookkeeping headaches — falls out of the fact that two notes now exist on one property and one of them is invisible to the buyer’s bank.

The two notes

The senior note (also called the underlying or wrapped lien). This is the seller’s original mortgage. It does not get paid off at closing. It does not get assumed. The lender is generally not told anything. The seller remains the borrower of record, personally liable, and the lien remains recorded in first position against the property.

The wrap note. The buyer signs a new promissory note payable to the seller, secured by a deed of trust or mortgage recorded in second position behind the senior lien. Its face amount is the sale price minus the buyer’s down payment — so it includes the money still owed on the senior note plus whatever equity the seller is financing on top.

The seller’s monthly job is now a pass-through: collect the wrap payment, remit the senior payment, keep the difference. The seller is a borrower and a lender at the same time, on the same house.

A worked example

Consider a seller who bought in 2019 with a conventional loan:

Rates have moved. The seller cannot sell conventionally at a price she likes, but she has a 5.25% loan that a buyer would love to be sitting behind. She sells on a wrap:

Both notes in this example accrue at the contract rate ÷ 12 and every payment lands on its due date, so each figure below is reproducible with nothing but that rate and the prior balance. Real notes are messier, which is the subject of the last half of this page.

The monthly spread

$2,306.74 collected minus $1,325.29 remitted is $981.45 per month, or $11,777.40 per year, of net cash flow. That is the number most people quote when they describe a wrap, and it is the number that gets a wrap oversold.

Why the spread understates the return

The senior payment is not an expense. Part of it is interest — a real cost — and part of it is principal, which reduces a debt the seller owes. Every dollar of senior principal the seller pays down increases her net position, whether or not she ever sees that dollar as cash.

Meanwhile, part of what the buyer sends is wrap principal, which is not income at all. It is the buyer buying down what he owes the seller. That shrinks the seller’s receivable.

Here is the first twelve months of the wrap, both sides:

The seller’s net position on day one is $300,000 receivable minus $212,127.38 payable, or $87,872.62. Twelve months later it is $297,732.12 minus $207,244.20, or $90,487.92 — a gain of $2,615.30.

Add the cash: $11,777.40 + $2,615.30 = $14,392.70. That equals wrap interest minus senior interest exactly, which is the sanity check that the accounting is right. The true first-year return is about 22% higher than the headline spread, and the reason is that a seven-year-seasoned 5.25% loan amortizes far faster than a brand-new 8.5% loan. In month one the senior payment retires $397.23 of principal while the wrap payment retires only $181.74.

That gap narrows every year and eventually inverts. A wrap sold on the spread alone is described wrong in both directions — understated early, overstated late.

The due-on-sale clause

Nearly every institutional mortgage written in the last forty years contains a due-on-sale (or alienation) clause giving the lender the right to call the entire balance immediately if the property is transferred without its consent. A wrap transfers the property. That is not a technicality or a gray area — it is the plain reading of the clause, and everyone structuring a wrap should assume the lender has the contractual right to accelerate.

What is genuinely uncertain is whether a given lender will exercise that right, and lenders holding below-market paper have historically had little incentive to. That is a business observation, not a legal opinion, and it is worth exactly what an observation about someone else’s future behavior is worth. The risk is asymmetric: a wrap that runs quietly for a decade produces the numbers above, and a wrap that gets called produces a demand for a six-figure balance on short notice.

This is why wraps are typically papered by a real estate attorney, why the buyer’s title and insurance arrangements get scrutinized, and why some sellers structure a shorter balloon so the buyer is contractually pushed to refinance out.

Due-on-sale is also not the only legal layer, and in some states it is not the sharpest one. A few states regulate wraps directly rather than leaving them to general contract law — Texas, for one, requires a seven-day written disclosure under Tex. Prop. Code § 5.016 and, since 2022, imposes a separate wrap-loan regime under Tex. Fin. Code Ch. 159 whose consequences for getting it wrong reach as far as the validity of the wrap lien itself. If the property is in Texas, read the seven-day notice and wrap disclosure requirements before going any further. Talk to a licensed attorney in the property’s state before writing one. Nothing here is legal advice.

What actually goes wrong: the servicing

The financial structure of a wrap is simple. Running one for ten years is not, because two notes on one property never line up neatly.

Two payment dates. The senior note is due the 1st with a fifteen-day grace period. The wrap is written due on the 1st too, because that seemed sensible at signing. When the buyer pays on the 12th, the seller has three days to move money. In practice most sellers set the wrap due date earlier — the 20th of the prior month, say — precisely to build in float. Now the two notes are permanently out of phase, and any statement that shows them side by side has to reconcile across a month boundary.

Two day-count conventions. The senior note likely accrues on a fixed monthly convention. The wrap may be written to accrue per diem on actual days. Under a per-diem note, a payment received late accrues more interest and therefore reduces principal by less — which is the whole subject of how payment application order changes a balance. Run the two notes on different conventions and the seller’s spread is not a constant $981.45; it moves a few dollars every month, and the seller who budgeted a flat number will be wrong every month.

Two balances, and only one of them is the buyer’s business. The buyer is entitled to know his own balance. The senior balance is the seller’s information. But a payoff on the wrap requires both, because the senior lien must be released for title to clear.

The remittance failure. This is the one that ends in litigation. The seller collects from the buyer and, for whatever reason — cash pressure, disorganization, an unrelated hardship — does not remit to the senior lender. The buyer is current on the note he signed. The senior lender, which has no relationship with the buyer, begins foreclosure on a lien that is in first position. A buyer can be perfectly current and still lose the house.

The standard mitigation is a licensed third-party servicer who receives the buyer’s payment, remits the senior payment directly, and forwards the remainder to the seller. The seller never touches the money that isn’t hers. It costs a modest monthly fee and removes the single largest structural risk to the buyer. Any buyer signing a wrap should ask for it, and a seller who refuses has told the buyer something useful.

Records are the deliverable

The wrap ends the day the buyer refinances or sells, and on that day someone will ask the seller to produce a complete accounting: every payment received, how each was applied, and the exact balance. A new lender underwriting the buyer’s refinance will want twelve to twenty-four months of clean history before it will lend. If the seller’s records are a shoebox and a spreadsheet with no audit trail, that refinance stalls — and a stalled refinance on a wrap means the senior lien stays in the seller’s name longer than she planned. See what a certified payment history has to contain for what the underwriter is actually looking for.

The recordkeeping problem here is not exotic. It is two amortizing notes, tracked on their own terms, from a ledger of dated transactions rather than a schedule printed at closing — because the schedule printed at closing stops being true the first time a payment lands on a day it wasn’t supposed to. That is the problem OwnerNote is being built to handle.

A wrap is also only one of several ways to structure a seller-financed sale, and the choice of instrument carries different consequences on default. If you are still deciding, compare it against a contract for deed and a deed of trust in Texas.