A 7.28% Mortgage Against a 5.23% Ten-Year: What Sits in the Two-Point Gap

The 30-year fixed mortgage averaged 7.28% in Freddie Mac's October 1 survey. The 10-year Treasury yield, which lenders use to price long-dated fixed-rate debt, was hovering around 5.23% on the Thursday afternoon, according to Fox Business. The two figures are related, and the roughly two percentage points between them is where most of the interesting behaviour in mortgage pricing happens.

Why the benchmark is the ten-year and not the thirty

A 30-year mortgage is rarely a 30-year loan. Borrowers move, refinance and pay down principal, so the average life of a mortgage is far shorter than its stated term, and historically closer to the duration of a ten-year note than a thirty-year bond. That is why the 10-year yield, rather than the 30-year, serves as the reference. It is also why the Federal Reserve's policy rate reaches mortgage pricing indirectly: the Fed sets a very short-term rate, and mortgage rates respond to what that implies for longer-dated yields.

What the spread is paying for

The gap is a stack of distinct charges and risk premiums, not a margin.

• The prepayment option. A borrower can refinance when rates fall but is under no obligation to when they rise. An investor in a mortgage bond is therefore short an option, and must be paid for it. The more uncertain the path of rates, the more that option costs, and the wider the spread.
• Credit risk and guarantee fees. A Treasury note carries no default risk for the holder. A mortgage does, and where it is securitised through a government-sponsored enterprise, a guarantee fee is charged to absorb that risk.
• Servicing. Someone collects payments, administers escrow, handles delinquencies and manages foreclosures, and that cost is embedded in the rate.
• Origination costs and lender margin. Underwriting, compliance and capacity all sit here, and lender margins widen when volumes fall and narrow when competition for loans is intense.
• Investor demand for mortgage bonds. Mortgage-backed securities compete with every other asset. When the largest buyers step back, the yield required to clear the market rises, and the spread widens independently of the Treasury.

Why this matters for reading a rate move

Because these components move on their own schedules, the spread is not a constant and mortgage rates do not track Treasury yields one for one. A week in which the 10-year yield rises modestly can still produce a larger move in the mortgage average if volatility expectations have risen or mortgage-bond demand has softened. The converse also holds, and it is why falling Treasury yields have at times failed to deliver the mortgage relief borrowers expected. A single week's figures cannot distinguish between these causes.

This article explains pricing mechanics using published figures and is for informational purposes only. It is not investment, lending or financial advice, and it is not a recommendation to buy, sell, borrow, refinance or time any decision. Readers should consult primary sources for current rates and yields.