
Navigating option arm rates can be a daunting task, especially for those who are new to the world of adjustable-rate mortgages. Option arm rates can be as low as 1% to 3% below the prime rate, which can be attractive for homeowners who want to keep their monthly payments low.
Understanding how option arm rates work is crucial to making informed financial decisions. Option arm rates can be reset periodically, which can lead to a significant increase in monthly payments.
For example, if you have an option arm loan with a 2% margin above the prime rate, and the prime rate is 4%, your initial interest rate would be 6%. However, if the prime rate increases to 6%, your new interest rate would be 8%.
It's essential to carefully review the terms and conditions of your loan to understand how option arm rates can impact your financial situation.
A different take: How Does the Prime Rate Affect Mortgage Rates
What is an Option ARM?

An Option ARM is a type of mortgage that can lead to financial trouble if not managed carefully. It offers a low teaser rate that may seem appealing, but this rate is only temporary and can reset to a much higher rate.
The teaser rate is often as low as one percent, which can make homeowners feel like they can afford more home than they actually can. This can be a problem when the teaser rate expires and the interest rate resets to a much higher rate.
For those who choose to make only the minimum payments, the principal owed on the mortgage can actually increase. This is because the minimum payments don't cover the full interest, so the unpaid interest is added to the principal.
The Option ARM was popular before the subprime mortgage crisis of 2007-2008, when home prices were rising rapidly.
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How Option ARMs Work
An option ARM allows borrowers to choose their monthly payment type, which can include making a minimum payment, an interest-only payment, a 15-year fully amortized payment, or a 30-year amortized payment.
Take a look at this: 3 Year Arm Mortgage Rates

The Consumer Financial Protection Bureau effectively eliminated Option ARMs in 2014 via new Qualified Mortgage standards.
Borrowers can easily be saddled with more long-term debt than they started with, as the minimum payment can increase annually and may be recast at five or 10-year intervals to a fully amortizing payment.
If the borrower continues to make just the minimum payment and the unpaid balance grows to exceed the original value of the mortgage, the mortgage could automatically reset.
Understanding Option ARMs
Option ARMs can be tricky to understand, but let's break it down. They often have a low teaser rate, which might seem like a great deal, but it's usually only for a short time.
The teaser rate is typically one percent, which can make it seem like you're getting a good deal. However, this rate is usually only for a month, after which the interest rate resets to a much higher amount.

The new interest rate is often tied to an index, such as the Wells Cost of Saving Index (COSI), plus a margin. This can result in a much higher payment than you were expecting.
If you only make the minimum payment, the principal on your mortgage can actually increase. This is because the minimum payment doesn't cover the entire interest, so the remaining amount is added to the principal.
In the past, option ARMs were popular, especially during the time of rapid home price growth leading up to the 2007-2008 subprime mortgage crisis. However, since 2014, regulations have made them less popular.
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ARM Payment Methods
Option ARMs offer borrowers flexibility in how they pay their mortgage each month. The lender may let the borrower decide between making a minimum payment, an interest-only payment, a fully amortized payment on a 15-year mortgage, or a fully amortized payment on a 30-year mortgage.
The Consumer Financial Protection Bureau effectively eliminated Option ARMs in 2014 via new Qualified Mortgage (QM) standards.
On a similar theme: 10 Year Adjustable Mortgage Rates
The minimum payment with an option ARM can increase annually, and the unpaid balance can grow to exceed the original value of the mortgage. This can lead to the mortgage automatically resetting.
Borrowers who opt for the minimum payment may be able to keep more money in hand, but they risk accumulating more long-term debt than they started with.
Benefits and Suitability
An Adjustable-Rate Mortgage (ARM) can be a good option for buyers who plan to stay in their home for only a short period of time and want to keep their monthly payment low.
In an ARM, the initial interest rate is generally lower and lasts for a set period of time, often 5 years, as in a 5/5 ARM.
This type of mortgage could also be suitable for buyers in a high-interest market, with the possibility to refinance later if rates drop.
The fixed interest rate period and the frequency of rate changes are key factors to consider when evaluating an ARM.
For more insights, see: Time Weighted Rate
Core Benefits of Adjustable-Rate Mortgage
Adjustable-rate mortgages offer several key benefits that make them an attractive option for some homebuyers. Lower rates are one of the main advantages of an ARM loan, typically lower than 30-year fixed-rate loans during the initial rate period.
One of the most significant benefits of an ARM loan is lower monthly payments. The initial monthly payments for ARM loans are typically lower than fixed-rate loans.
Here are the core benefits of an ARM loan at a glance:
- Lower rates: ARM loans typically have lower rates than 30-year fixed-rate loans during the initial rate period.
- Lower monthly payments: The initial monthly payments for ARM loans are typically lower than fixed-rate loans.
These benefits can be particularly appealing to homebuyers who expect their financial situation to improve over time, allowing them to handle potential increases in their monthly payments.
When Is an Adjustable-Rate Mortgage Suitable?
An Adjustable-Rate Mortgage (ARM) can be a suitable option for buyers who plan to stay in their home for only a short period of time and want to keep their monthly payment low.
This is because ARMs often come with a lower initial interest rate that lasts for a set period, usually 5 years, as seen in the example of a 5/5 ARM.

If you're planning to sell or move to a new home within a few years, an ARM can help you save money on interest payments.
ARMs can also be a good option in a high-interest market, where you can refinance later if interest rates drop. This is because you'll have the opportunity to take advantage of lower rates and reduce your monthly payment further.
For example, a 5/5 ARM would have the same interest rate for the first 5 years, and then the rate would adjust every 5 years after that.
Rates and Options
Option ARMs often come with a low teaser rate, which can be as low as one percent. This can lead people to assume they can afford more home than their income suggests.
The teaser rate is usually only for a short period, and then the interest rate resets to an index such as the Wells Cost of Saving Index (COSI) plus a margin. This can result in a significant increase in payments, also known as "payment shock."
Many people who took the minimum payments option on their ARM found that the principal owed on their mortgage actually increased. This is because the minimum payments didn't entirely cover the mortgage's interest, so the uncovered interest was added to the principal.
Rates
Rates can vary depending on the type of loan you choose. The interest rates for adjustable-rate mortgages (ARMs) are "as low as" 5.625% for both conforming and jumbo loans.
Discount points can be purchased to lower a loan's interest rate and monthly payment. One point amounts to 1% of the loan amount and is paid at closing.
The APR (Annual Percentage Rate) for these ARMs is "as low as" 6.310% for both conforming and jumbo loans. This means your annual percentage rate may increase after the original fixed-rate period.
Here's a summary of the rates for different ARM loan options:
Keep in mind that rates are subject to change and the rates displayed are "as low as" for purchase and refinances.
Navy Federal ARMs
Navy Federal ARMs are a great option for those looking to save on interest payments. During the initial term of your loan, your interest rate will generally be lower, making your payments more affordable.

One of the benefits of Navy Federal ARMs is that they often don't require Private Mortgage Insurance (PMI), which can save you hundreds or even thousands of dollars over the life of the loan. Most lenders require the borrower to purchase PMI unless they're able to make a down payment of 20%.
If you already have a mortgage and want to refinance for a different interest rate or shorter term, Navy Federal ARMs might be a good fit.
What is SOFR ARM?
A SOFR ARM uses the Secured Overnight Financing Rate (SOFR) index to determine the interest rate after the initial fixed-rate period.
This index is used to create a variable rate that can go up or down every six months. The margin set by the bank remains the same for the life of the loan, but the index's fluctuations can impact the interest rate.
The rate becomes variable during the adjustable-rate period, based on the SOFR index and the bank's margin. All ARM loans have limits on how high or low the rate can go.
On a similar theme: Ally Bank Rates
Financial Considerations

Considering an Adjustable Rate Mortgage (ARM) requires some financial planning. A 5-Year ARM, for example, comes with an interest rate that can change every five years.
You might choose an ARM if you're planning to move or refinance before the rate adjusts. This type of mortgage can save you money upfront, but be aware that the rate can increase.
To be financially prepped for an ARM, you should have a solid emergency fund in place. This will help you cover unexpected expenses, such as higher mortgage payments, if the interest rate increases.
ARM Loan vs Fixed-Rate Mortgage
ARM loans have an initial fixed-rate period of five, seven or 10 years and an adjustable rate for the remaining life of the loan. Your monthly payment could increase or decrease after the introductory period depending on how the index rate fluctuates.
Fixed-rate loans have a fixed rate and fixed monthly payment for the entire loan term. This means you'll always know exactly how much you'll be paying each month.
Recommended read: Fixed Mortgage Meaning

ARM loans have interest rates that may change periodically, which can be a concern for those who value predictability. Adjustable rate mortgages, also known as variable-rate mortgages, have interest rates that may change periodically based on the corresponding financial index.
In contrast, fixed rate mortgages have an interest rate that remains the same for the life of the loan. This can provide peace of mind for those who want to avoid surprises.
Prepare for ARM Finances
If you're considering an adjustable-rate mortgage, it's essential to be financially prepped for the potential changes in your payments. This includes understanding that interest rates can change every five years with a 5-Year ARM.
The Consumer Financial Protection Bureau effectively eliminated Option ARMs in 2014, so you won't see these types of mortgages offered anymore. This is a good thing, as Option ARMs can lead to more long-term debt than you started with.
Households with fluctuating incomes, such as freelancers or those on commission, may be drawn to the flexibility of an Option ARM. However, this comes with the risk of drastically increasing interest rates and rising principal balances.

If you do choose an Option ARM, be aware that the minimum payment can increase annually and may be recast to a fully amortizing payment every five or 10 years. This can leave you unprepared for the rising costs and increasing principal balance.
In extreme cases, if you continue to make just the minimum payment, the mortgage could automatically reset if the unpaid balance grows to exceed the original value of the mortgage, such as 110% or more. This can lead to serious financial trouble, as we saw during the housing crisis.
Frequently Asked Questions
What is a 5 year ARM rate?
A 5-year ARM rate is a variable interest rate that's fixed for the first 5 years, then adjusts annually based on market conditions. After 5 years, the rate becomes variable and may increase or decrease.
Sources
- https://www.erate.com/option-arm-adjustable-rate-mortgage-payment-option
- https://www.investopedia.com/terms/o/option_arm.asp
- https://www.usbank.com/home-loans/mortgage/adjustable-rate-mortgages.html
- https://www.navyfederal.org/loans-cards/mortgage/mortgage-rates/adjustable-rate-mortgages.html
- https://www.ncsecu.org/loans/mortgages/adjustable-mortgages.html
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