What Is a Variable-Rate Mortgage?
Your mortgage’s interest rate can change, for better or worse
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Whether you’re applying for a government-backed loan or a conventional mortgage, you’ll likely have the choice between a fixed or variable interest rate. Although a fixed rate is typically safer since the interest rate won’t change for the life of the loan, variable-rate mortgages often have a low, fixed-rate introductory period, meaning you could have lower monthly payments at the beginning of your loan. A lower initial interest rate could be appealing if you plan to pay extra on the principal during this time or move before the first rate adjustment.
A variable-rate mortgage is a type of mortgage where the interest rate can adjust up or down depending on market conditions.
Jump to insightVariable rates are generally determined according to a lender’s chosen index, which reflects market conditions, among other factors.
Jump to insightWhile your rate could drop with a variable-rate mortgage, it could also increase, resulting in higher monthly mortgage payments and possibly more interest in the long run.
Jump to insightHow variable-rate mortgages work
A variable-rate mortgage, often called an adjustable-rate mortgage (ARM), is a type of home loan where the interest rate can change periodically. Some variable-rate mortgages may include a fixed introductory rate, which is often lower than what you would get with a fixed-rate mortgage. However, your interest rate and monthly payment are not guaranteed to stay the same.
Student loans, home equity lines of credit (HELOCs), credit cards and personal lines of credit all typically have variable interest rates.
Variable-rate mortgages vs. fixed-rate mortgages
While the interest rate on a variable-rate mortgage can change, a fixed-rate mortgage maintains a consistent rate throughout the entire loan. Determining whether a variable-rate or a fixed-rate mortgage is best for you depends on your current financial situation.
With a fixed-rate mortgage, your monthly payment will always be the same. This can be a safer and more predictable approach for borrowers. Although you may pay less initially with a variable-rate mortgage, it can be more risky because your interest rate and monthly payment could rise once the introductory period ends.
» MORE: What is a conventional mortgage?
How variable rates are determined
There are many different factors that influence how mortgage rates are determined.
Market conditions
The lender has a chosen index that reflects overall market conditions. Common indexes include the U.S. Prime Rate, the London Interbank Offered Rate (LIBOR) and the Cost of Funds Index (COFI).
Lender terms
The lender then adds a margin — an additional percentage to cover costs and profit margins — to the index to determine your interest rate. However, variable-rate mortgages typically have interest-rate caps, meaning your rate won’t exceed the amount listed in your loan agreement.
Individuals’ financial situations
Lenders will generally consider your employment history, income, credit score and debt-to-income ratio (DTI) when determining your rates. Most mortgage lenders also require a minimum down payment between 3% to 5%.
Pros and cons of variable-rate mortgages
Under the right circumstances, a variable-rate mortgage can be an excellent option for homebuyers. Consider the pros and cons of variable-rate mortgages:
Pros
- Low introductory rate
- Rates may drop
- Better for short-term loans
Cons
- Unpredictable rates
- Fluctuating payments
- Rates may increase
Is a variable-rate mortgage right for you?
Before choosing a variable-rate mortgage, you should consider your current and future financial situation.
“I had a close friend who opted for a variable-rate mortgage to capitalize on the lower initial rates, driven by a stable job in a growing tech company and the assumption of continued low market rates,” said Larry Zhong, a former licensed Financial Industry Regulatory Authority (FINRA) financial advisor and founder of YieldAlley, a financial education website.
“Two years into the mortgage, when the [Federal Reserve] raised interest rates to combat inflation, my friend was shocked to see a significant increase in his monthly payments,” Zhong said. “This adjustment strained his budget, as it coincided with unexpected job instability in the tech sector.”
While a low introductory rate may be appealing, it's important to factor in your risk tolerance and potential unexpected hardships, such as job loss, medical issues or poor market conditions.
“One crucial piece of advice that emerged from my friend's experience is [that] it's important to understand how various interest rate scenarios can impact your monthly payments before choosing a variable-rate mortgage,” Zhong said. “Making an informed choice requires looking beyond immediate benefits and preparing for various future scenarios.”
» RELATED: What is a convertible ARM loan?
FAQ
Can you switch from a variable-rate mortgage to a fixed-rate mortgage?
Typically, you can switch from a variable-rate to a fixed-rate mortgage by contacting your lender and requesting a switch. Penalties may apply.
How often do variable-rate mortgage interest rates change?
The frequency of interest rate changes for a variable-rate mortgage depends on the loan agreement. For example, with a 5/1 ARM, the interest rate is fixed for five years and then adjusted annually based on market conditions.
What happens if interest rates rise substantially?
Lenders typically have interest-rate caps on variable-rate mortgages. While your rate will likely increase if rates rise substantially, it will never exceed your interest-rate caps.
What is a hybrid mortgage?
With a hybrid mortgage, you’ll have an initial fixed-rate period before the rate becomes variable. For example, a 5/1 ARM has a fixed rate for the first five years and can be adjusted annually afterward.
Can you pay off an ARM loan early?
If you pay an ARM loan off early, some lenders may charge you a prepayment penalty. Before taking out an ARM, check the terms of the agreement.
How do interest-rate caps work?
With adjustable-rate mortgages, there are typically three types of interest-rate caps: initial, periodic and lifetime caps. These caps dictate how much an interest rate can increase or decrease the first time it adjusts, during an adjustment period and over the lifetime of the loan.
Bottom line
Although variable-rate mortgages carry some risks, these types of mortgage loans may be beneficial for homebuyers who expect interest rates to decline or who plan to sell before the introductory period ends. However, always review the loan estimate to ensure you can meet the maximum monthly payments in case of future financial challenges, such as increased interest rates, job loss or medical issues.
Article sources
ConsumerAffairs writers primarily rely on government data, industry experts and original research from other reputable publications to inform their work. Specific sources for this article include:
- Consumer Financial Protection Bureau (CFPB), “Determine Your Down Payment.” Accessed Nov. 13, 2025.
- CFPB, “What Is the Difference Between a Fixed-Rate and Adjustable-Rate Mortgage (ARM) Loan?” Accessed Nov. 13, 2025.
- Freddie Mac, “Considering an Adjustable-Rate Mortgage? Here’s What You Should Know.” Accessed Nov. 13, 2025.
