Fixed vs. Adjustable-Rate Mortgage: Which Fits Your Las Vegas Home Purchase?

Quick answer: A standard fully amortizing fixed-rate mortgage keeps principal and interest payments constant. An adjustable-rate mortgage (ARM) often starts at a lower rate, then adjusts under the loan’s terms. For a Las Vegas home purchase, compare the starting payment, potential increases and total ownership costs. Taxes and insurance can change with either loan.

By huntington & ellis, A Real Estate Agency | Updated November 2, 2026

This guide walks through the four things that separate the two loans: the initial payment, the adjustment schedule, the rate caps and the possible future payment. It uses the same terms that appear on the federal Loan Estimate, so you can hold any lender’s quote up against it. If you’re still building your overall budget, start with our breakdown of what it costs to buy a $500,000 home in Las Vegas, then come back here to choose the loan structure.

Fixed vs. adjustable-rate mortgage at a glance

For a sense of today’s spread: Freddie Mac’s weekly survey put the average 30-year fixed rate at 7.24% and the 15-year fixed at 6.60% for the week of October 29, 2026 [1]. The Mortgage Bankers Association’s survey for the week ending October 23 reported an average 5/1 ARM contract rate of 6.41% against 7.37% for a 30-year fixed conforming loan, and ARMs made up 11.3% of applications [2]. These two surveys use different methods and weeks, so treat the gap between them as a rough guide, not a like-for-like quote. The 30-day average SOFR, the index most conforming ARMs now use, was 3.89857% on October 30, 2026 [3].

How different are the initial payments?

To keep the math clean, every example below uses the same hypothetical loan: a $500,000 purchase with 20% down ($100,000), a $400,000 loan amount, and 360 monthly payments of principal and interest. The fixed rate (7.25%) is rounded from the Freddie Mac average [1]; the ARM starting rate (6.375%) is a hypothetical figure near the MBA ARM average [2]. Both assume no points or lender fees, so they are illustrations, not quotes.

Over the first five years, the ARM in this example costs about $14,000 less in payments and leaves a balance about $3,600 lower, because more of each payment goes to principal at the lower rate. Those initial savings do not guarantee a lower lifetime cost. Later adjustments and refinancing costs can change the comparison. Taxes, homeowners insurance and any HOA dues sit on top of these figures for both loans.

How does an ARM adjustment schedule work?

An ARM’s name tells you its schedule. In a “5/6” ARM, the first number is how many years the starting rate lasts, and the second is how often it changes afterward: every 6 months [4]. Conforming SOFR ARMs come as 3/6, 5/6, 7/6 and 10/6 loans [5].

At each change, the new rate is the index plus the margin, limited by the caps [4]. For conforming loans the index is the 30-day average SOFR published by the Federal Reserve Bank of New York, measured 45 days before the change date, and the margin falls between 1% and 3% [5]. The margin is set at closing and doesn’t change, so it’s worth comparing across lenders just as closely as the starting rate.

In our example, with a hypothetical 2.75% margin and SOFR at about 3.90% [3], the “fully indexed” rate today would be about 6.65%. That’s above the 6.375% starting rate, which means the intro rate is partly a discount. The CFPB notes that a starting rate below the fully indexed rate can lead to a higher payment at the first change even if the index never moves [4]. Your loan servicer must send notice ahead of a payment change [4].

What do ARM caps like 2/1/5 and 5/1/5 mean?

Caps limit how far the rate can move. They’re written as three numbers: the most the rate can change at the first adjustment, at each later adjustment, and over the life of the loan above the starting rate [4]. Freddie Mac’s SOFR ARM terms are below [5]; individual lenders may offer different structures, so read the caps on your own Loan Estimate.

Notice what 5/1/5 means: on a 7/6 or 10/6 ARM, the rate can reach its lifetime maximum at the very first change. The longer intro period buys more years of certainty, but the first adjustment can be larger. On a 5/6 ARM with 2/1/5 caps, the rate climbs more gradually, at most 2 points and then 1 point every six months.

What could my ARM payment be in the future?

Here is the same $400,000 5/6 ARM at its first change (payment 61), with about $373,901 left to repay over the remaining 300 payments. Each line assumes the 2.75% hypothetical margin and 2/1/5 caps.

The worst case keeps going. If the index kept rising, the 1% periodic cap would allow the rate to reach 9.375% at payment 67 ($3,231.36), 10.375% at payment 73 ($3,488.13) and the 11.375% lifetime cap at payment 79, for a maximum principal and interest payment of about $3,748.95, roughly $1,020 more than the fixed-rate payment in our example. Reaching that maximum would require the 30-day average SOFR to rise to about 8.6%, well above its current level [3]. That isn’t a forecast. It’s the ceiling your disclosures put in writing, and it’s the number to test your budget against.

A 7/6 ARM with 5/1/5 caps and the same starting rate would reach that same 11.375% ceiling, but it could do so at its first change in year eight.

How do I read the official loan disclosures?

You don’t have to rebuild these numbers yourself. Federal rules require lenders to show them in standard places:

ARM program disclosure and the CHARM booklet. When you discuss or apply for an ARM, the lender gives you the CFPB’s Consumer Handbook on Adjustable-Rate Mortgages and a program disclosure explaining the index, margin, caps and adjustment frequency for that product [4].

Loan Estimate, page 1. The lender must deliver it within three business days of receiving your application [6]. The Loan Terms section answers “Can this amount increase after closing?” for the interest rate and the monthly principal and interest, including the maximum rate and payment and the earliest date each could be reached. The Projected Payments table shows the payment as a range for each adjustment period, from the fastest possible decline to the fastest possible rise [6].

Loan Estimate, page 2. The Adjustable Interest Rate (AIR) table lists the index and margin, initial rate, minimum and maximum rate, when the first change happens and how often after that, and the limits on each change. It never appears on a fixed-rate loan [6]. An Adjustable Payment (AP) table appears only when the payment can change for reasons other than the rate, such as an interest-only period [6].

Get Loan Estimates for both loan types from the same lender, and the same loan type from more than one lender. Then compare the starting rate, the margin, the caps, the maximum payment and the upfront costs side by side.

What should Las Vegas and Henderson buyers include in the budget?

Compare the actual homes as well as the loans. For a property in Las Vegas, Henderson or Summerlin, gather the property tax information, an insurance quote, applicable HOA dues and any outstanding assessments. Add a realistic allowance for utilities and maintenance, including pool or landscaping care when relevant.

Use the same ownership-cost assumptions for both loan options. Then add the ARM’s maximum principal and interest payment from the lender’s disclosures to see whether the home still fits your budget. huntington & ellis can help organize property-specific information while your lender explains the financing terms.

How huntington & ellis would approach the decision

huntington & ellis is a real estate brokerage, not a lender, so we don’t set rates or approve loans. What we can do is help you connect the loan to the home and the timeline:

First, we build your full monthly ownership cost for the homes you’re considering: principal and interest, property taxes, homeowners insurance, HOA dues and any assessments, utilities and maintenance. Property tax details for a specific parcel can be checked through the Clark County Assessor. Second, we run that budget twice: once with the fixed-rate payment and once with the ARM’s maximum payment from the Loan Estimate. Third, we talk through how long you expect to own the home, because that is what decides whether an ARM’s head start matters. When you’re ready to compare offers, you can request Loan Estimates from our preferred mortgage lender, note. A Mortgage Agency (NMLS #2413481), a Las Vegas lender on our preferred partners list. You are not required to use note. or any other particular lender, and we encourage you to compare Loan Estimates from more than one.

What should I ask a lender first?

Ask for two Loan Estimates on the same home and down payment: one 30-year fixed and one ARM. Then ask four questions about the ARM: What are the index and the margin? What are the initial, periodic and lifetime caps? What is the maximum monthly principal and interest, and in which month could it first be reached? And what would it cost in points or fees to lower either rate? If the maximum payment doesn’t fit your budget, that’s your answer before rates even come into it.

If you’d like a starting point, you can find a loan officer at note. and ask for a fixed-rate and an adjustable-rate Loan Estimate on the same scenario, then take those questions to any other lender you’re comparing.

The short answer

A standard fixed-rate mortgage keeps principal and interest payments constant. An ARM often starts at a lower rate, then adjusts under its loan terms. Taxes and insurance can change with either option. In our $400,000 example, the ARM saved about $233 a month for five years but could rise to roughly $3,749 a month at its lifetime cap. Choose the loan whose worst-case payment you can live with, for as long as you expect to own the home.