Free Wrap Mortgage Calculator

Calculate the interest rate spread, monthly cash flow, and seller yield on any wrap mortgage deal. Instant results, plain English.

Underlying Loan (Seller's Existing Mortgage)

Remaining balance on the seller's existing mortgage
The interest rate on the seller's existing loan
Months remaining on the seller's original loan

Wrap Mortgage (New Loan to Buyer)

Total loan amount the buyer is agreeing to (usually higher than underlying)
The interest rate the buyer pays on the wrap mortgage
Length of the wrap mortgage agreement

Results

Buyer's Monthly Payment
Seller's Underlying Payment
Seller's Monthly Spread
Rate Spread
Seller's Annual Spread Income
Seller's Yield on Spread
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How a Wrap Mortgage Works

A wrap mortgage — also called a wrap-around mortgage or all-inclusive trust deed (AITD) — is a type of seller financing where the seller creates a new mortgage that "wraps around" their existing loan. Here's how the money flows:

The buyer makes one monthly payment to the seller on the wrap mortgage. This payment is based on the full wrap loan amount at the agreed wrap rate.

The seller continues making payments on their original underlying mortgage and keeps the difference (the "spread") as profit. The spread comes from two sources: (1) the difference in interest rates, and (2) any difference in loan balance between the wrap and the underlying loan.

Example: Seller has a $150,000 mortgage at 4.5%. They create a wrap at $180,000 at 7%. The buyer pays based on $180,000 at 7%. The seller pays their lender based on $150,000 at 4.5%. The seller pockets the monthly difference — which this calculator computes for you.

Important: Most conventional mortgages have a due-on-sale clause, which allows the lender to demand full repayment when the property is sold or transferred. Wrap mortgages may trigger this clause. Always consult a real estate attorney before structuring a wrap deal.

Frequently Asked Questions

What is a wrap mortgage?

A wrap mortgage is a form of seller financing where the seller creates a new mortgage that wraps around their existing loan. The buyer makes payments to the seller; the seller continues paying the underlying lender and profits from the spread between the two rates.

How does a wrap mortgage differ from subject-to?

In a subject-to deal, the buyer takes title and makes payments directly on the seller's existing loan. In a wrap, the seller retains the underlying loan liability and creates a new, larger loan for the buyer. The seller earns the spread.

What is the interest rate spread in a wrap mortgage?

The spread is the difference between the wrap rate (what the buyer pays) and the underlying rate (what the seller owes). If the wrap is at 7% and the underlying is at 4.5%, the spread is 2.5%. The seller earns income on this spread monthly.

Is a wrap mortgage legal?

Wrap mortgages are legal in most states, but they're complex — especially because most conventional loans have a due-on-sale clause that could allow the lender to call the loan due. Always work with a real estate attorney before executing a wrap deal.

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