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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteA fixed-rate mortgage is usually the better fit if you want predictable principal-and-interest payments or expect to keep your home for many years. An adjustable-rate mortgage (ARM) may suit you if you expect to sell during its initial fixed-rate period and could still afford the loan’s maximum possible payment if that plan changes. Compare written Loan Estimates and do not count on being able to sell or refinance before an ARM adjusts.
This guide covers U.S. mortgages. The right choice depends on your actual loan terms, plans, and capacity to handle a higher payment—not on a general rule or a rate quote.
How fixed-rate and adjustable-rate mortgages differ
| Decision point | Fixed-rate mortgage | Adjustable-rate mortgage (ARM) |
|---|---|---|
| Interest rate | Set at origination and unchanged over the loan term. | Commonly fixed for an initial period, then may change at scheduled intervals according to the contract. |
| Principal-and-interest payment | Stays the same while the interest rate is fixed. | Can rise or fall after adjustments; timing and limits depend on the loan terms. |
| Predictability | More predictable principal-and-interest payments. The total housing payment may still change if property taxes, insurance, or mortgage insurance changes. | Less predictable after the initial period; the interest rate and payment can increase. |
| Potential advantage | A known interest rate and principal-and-interest payment for the loan term. | May start with a lower rate than a fixed-rate offer and may suit some shorter ownership horizons. |
| Main risk | The initial rate may be higher than an ARM’s introductory rate; only actual offers show the difference for your situation. | The introductory rate is temporary. Later increases may be unaffordable, and refinancing or selling before an adjustment is not assured. |
| What to compare | Loan amount, term, rate, points, fees, payments, and total costs on the written Loan Estimate. | Those same details, plus the first adjustment date, adjustment frequency, index, margin, caps, maximum payment, and payment recalculation terms. |
In historical data for 2008–2022, the Consumer Financial Protection Bureau (CFPB) reports that 85–95% of buyers chose fixed-rate mortgages and 5–15% chose ARMs. These are historical ranges, not current market shares or evidence that one type is best for a particular borrower. CFPB: Compare loan options
How an ARM adjusts
Initial rate and adjustment schedule
Most ARMs start with an interest rate that stays fixed for an initial period; after that, the rate may adjust at regular intervals. In common “5/1” terminology, the 5 means the initial rate stays fixed for five years, and the 1 means adjustments occur every year afterward. Other schedules exist, and the contract determines the actual dates and terms. CFPB: What is an adjustable-rate mortgage?
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Index, margin, and caps
After the initial period, the rate is generally calculated using an index plus a lender-set margin, subject to the loan’s caps. The index can fluctuate with market conditions; the margin is set in the agreement and normally does not change after closing. A low introductory rate is not the rate for the entire loan term. CFPB: What is an ARM margin?
Before choosing an ARM, get the following terms from the written offer and ask the lender to calculate the highest possible payment under the contract:
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- The initial fixed-rate period and first adjustment date.
- How often the rate may adjust after the first change.
- The index and margin used to calculate the adjusted rate.
- The initial, subsequent, and lifetime rate caps. Check whether caps differ for increases and decreases and whether a floor applies.
- Whether the payment is recalculated with each rate change.
- The maximum payment allowed by the contract and whether it fits your budget.
- Whether any payment structure could leave unpaid interest added to the principal balance.
Cap levels and payment rules vary by contract, so do not assume an example cap applies to your loan. CFPB: ARM rate caps
Who may prefer a fixed rate or an ARM?
A fixed rate may fit if predictability matters most
- You want the same principal-and-interest payment over the loan term.
- You plan to keep the home for a long time.
- Your budget has little room for a higher mortgage payment.
An ARM may fit if your horizon is shorter and your budget has room
- You expect to sell during the initial fixed-rate period.
- You can afford the maximum payment allowed by the contract if you keep the home longer than planned.
- You understand that the initial rate is temporary and future payments may rise.
These are decision factors, not guarantees or individual recommendations. The CFPB cautions: “Don’t assume you’ll be able to sell your home or refinance your loan before the rate changes.” A change in your finances or the home’s value could affect whether either option is possible. CFPB: Fixed-rate and adjustable-rate mortgages
How to compare actual mortgage offers
- Request written Loan Estimates. Compare offers using the same loan amount, term, and other assumptions. Do not rely on a verbal quote.
- Compare the full costs. Review the interest-rate structure, projected payment, points, fees, loan term, and other costs—not just the starting rate.
- For an ARM, inspect the adjustment terms. Identify the first adjustment date, frequency, index, margin, caps, payment recalculation terms, and maximum possible payment. Have the lender calculate that maximum.
- Use the five-year comparison carefully. The Loan Estimate’s “In 5 years” figure can help estimate interest and fees over five years: subtract the principal paid from the total paid. For an ARM, this illustration assumes rates stay the same; if rates rise, actual borrowing costs may be higher.
- Model payment scenarios if useful. A payment calculator can help explore possible outcomes, but it cannot replace a Loan Estimate or a contract-specific maximum-payment calculation.
CFPB guidance on reading a Loan Estimate and shopping for a mortgage can help you evaluate offers.
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