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Fixed-rate vs. adjustable-rate mortgage (ARM)
· Concept or strategy
Depends on youExperts differ; the right answer depends on your situation.
A fixed-rate loan keeps one rate for its whole term; an adjustable-rate mortgage resets with market rates after an initial period.
See it on the Personal Finance & Estate map →How it works
A fixed-rate loan keeps the same rate and principal-and-interest payment for its whole term. An ARM is fixed for an initial period, commonly 5, 7 or 10 years, then resets periodically to an index, now usually SOFR, plus a margin, limited by caps such as 2/1/5 (points at first reset, each later reset, lifetime). ARMs start cheaper. US home loans can usually be prepaid freely; commercial fixed loans often carry yield-maintenance or defeasance penalties.
Why it matters for you
Depends on you: a fixed rate buys certainty, while an ARM pays off if you sell or refinance before it resets. The trap is assuming you can always refinance in time.
Think of it like
Like a flat-rent lease versus one that resets to market after year five: cheaper now, uncertain later.
Rules, limits and sources (2026)
Mortgage Bankers Association data show ARMs were about a third of applications in 2004–05 and mostly under 10% since 2009; resetting subprime ARMs helped drive the 2007–08 foreclosure wave.
Watch out for
Economists debate whether borrowers overpay for fixed-rate certainty; studies suggest ARMs often cost less over time, but expose borrowers to payment shock.
Connections (2)
▸Fixed-rate vs. adjustable-rate mortgage (ARM) are the two rate choices for Mortgages & real-estate debtStandard practice
How they connect
Every mortgage, home or commercial, carries either a fixed rate or one that floats with an index. The choice decides who bears rising-rate risk: the lender on a fixed loan, the borrower on an ARM. Commercial loans add hybrids, such as floating-rate loans hedged with interest-rate caps or swaps.
When it applies
Long fixed-rate loans spread after the FHA (1934) and Fannie Mae (1938); federal regulators let savings institutions offer ARMs nationwide in 1981, as rates soared.
How sure?
Every residential Loan Estimate states whether the rate can change; Freddie Mac and MBA surveys track fixed and adjustable loans separately.
Watch out for
The long fixed-rate mortgage is largely American; Canada and Britain mostly fix rates for two to five years. Whether the US model is worth its cost is debated.
▸Bonds: Treasuries, T-bills, TIPS, I bonds & munis set the benchmark for Fixed-rate vs. adjustable-rate mortgage (ARM)Standard practice
How they connect
Mortgage rates track Treasury yields plus a spread for risk. Thirty-year fixed home rates follow the 10-year Treasury, typically 1.5–3 points above it; commercial fixed loans price off the 5-, 7- or 10-year Treasury or swap rate. ARMs reset off short-term rates, now usually SOFR, which tracks the Fed's policy rate.
When it applies
SOFR, published by the New York Fed since 2018, replaced LIBOR as the main ARM and floating-loan index between 2021 and 2023.
How sure?
Freddie Mac rate surveys and Treasury yield data, published weekly and daily, show the close relationship.
Watch out for
Why the mortgage-Treasury spread widened to about 3 points in 2023, versus about 1.7 historically, is debated; Fed mortgage-bond runoff, rate volatility and lender costs are all cited.