Hybrid ARM

Key Takeaways

• In a label like 5/1 or 7/6, the first number is how long the opening interest rate lasts and the second number is how often the rate changes after that.
• Once the fixed period ends, the rate becomes the index plus the margin, held inside the caps written into the note.
• The margin is set at closing and stays the same for the life of the loan. The index is what moves.
• A hybrid ARM fits a borrower who expects to sell or refinance before the fixed period runs out, because future rate movement matters less to a short hold.

What It Means

A hybrid ARM is an adjustable-rate mortgage that behaves like a fixed-rate loan for an opening period and like an adjustable loan afterward. The name comes from that mix. Lenders write it as two numbers, so a 5/1 ARM holds one rate for five years and then adjusts once a year, and a 7/6 ARM holds the rate for seven years and then adjusts every six months until the loan is paid off.

When the fixed period ends, the rate stops being a quoted number and becomes a formula. The lender takes the Index, adds the Margin written into the note, and the result is the fully indexed rate. Caps then limit how far it can move in practice. There is a limit on the first change, a limit on each later change, and a maximum rate for the life of the loan. That Interest Rate Cap structure is what separates a survivable adjustment from a payment the borrower cannot make.

The opening fixed stretch is the whole point of the product. It buys certainty for the years the borrower is most likely to still own the home.

How It Works in Washington

Washington does not set ARM rates, but it does police how the loan gets explained. Under the Mortgage Broker Practices Act, RCW 19.146.030(1), a Mortgage Broker or loan originator must give the borrower a full written disclosure within three business days after receiving the loan application.

RCW 19.146.030(2)(a) says what that disclosure has to carry, and the variable rate language is specific. It requires the annual percentage rate, finance charge, amount financed, total of all payments, and the conditions under which loan terms may change before closing, and, if a variable rate, the circumstances under which the rate may increase, any limitation on the increase, the effect of an increase, and an example of the payment terms resulting from an increase. For a hybrid ARM that means the borrower is entitled to see in writing when the first adjustment lands, what the caps are, and what the higher payment would look like. The statute also treats a disclosure that complies with the federal Truth in Lending Act and Regulation Z as satisfying the requirement.

For brokers, the practical duty is making sure a client reads the adjustment terms and not just the start rate. Our rundown of loan types every broker should know sets the hybrid ARM next to its alternatives.

Example

Priya buys a townhouse in Renton for $585,000 with 20 percent down, borrowing $468,000 on a 7/6 ARM. Her start rate is 5.25 percent, fixed for seven years, which makes the principal and interest payment about $2,584 a month. The note sets a margin of 2.75 percent, a 5 percent cap on the first change, a 1 percent cap on each later change, and a lifetime ceiling 5 percent above the start rate, so 10.25 percent.

Seven years in, the index sits at 4.10 percent. Index plus margin is 6.85 percent, which is well inside the first change cap, so her new rate is 6.85 percent. Six months later the index climbs to 5.60 percent. Index plus margin would be 8.35 percent, but the 1 percent cap on later changes holds the rate at 7.85 percent. However far the index runs after that, the note's 10.25 percent ceiling stands.

Common Mistakes and Exam Traps

• In a 5/1 ARM the second number is the adjustment frequency. It is not the number of adjustments and not the years remaining.
• A hybrid ARM's opening fixed rate is not automatically a teaser rate. A teaser, start, or discounted rate is one set below the lender's fully indexed rate, and not every hybrid uses one.
• The margin does not change over the life of the loan. The index moves, and that is what drives the payment.
• A rate cap is not a payment cap. A payment cap limits the dollar payment and can leave unpaid interest that is added to the balance, which is negative amortization.