What is a Fixed-Rate Mortgage and How Does It Compare to an ARM?

Understand the stability of fixed-rate mortgages and how they differ from adjustable-rate options in managing your home loan.

By Garret Merkley · Explainer · Jun 17, 2026

Branched from Adjustable-Rate Mortgages (ARMs): How They Work, Pros, and Cons

Quick take

A fixed-rate mortgage has an interest rate that stays the same for the entire loan term.
This provides predictable monthly payments, making budgeting easier and protecting you from rising interest rates.
Unlike ARMs, fixed-rate loans offer long-term payment stability and peace of mind, though you won't benefit if market rates fall.
It's a popular choice for borrowers who value consistency and want to lock in a rate when interest rates are favorable.

A fixed-rate mortgage is a home loan where the interest rate remains constant for the entire duration of the loan term, typically 15 or 30 years. This means the principal and interest portion of your monthly mortgage payment never changes, providing a high degree of predictability for homeowners.

How a Fixed-Rate Mortgage Works

When you take out a fixed-rate mortgage, the interest rate is set at the time of closing and stays the same until the loan is paid off. This stability means that regardless of what happens with market interest rates—whether they rise or fall—your core monthly payment for principal and interest will not change. While your total monthly payment can still fluctuate due to changes in property taxes or homeowner's insurance (which are often collected in an escrow account), the portion dedicated to repaying the loan itself remains constant.

The loan is amortized over its term, meaning that in the early years, a larger portion of your payment goes towards interest, and a smaller portion towards the principal. As the loan matures, this ratio gradually shifts, with more of each payment going to reduce your principal balance.

Why a Fixed-Rate Mortgage Matters

Fixed-rate mortgages are valued for their stability and predictability. They simplify long-term financial planning because you know exactly what your principal and interest payment will be each month for decades. This type of loan is particularly appealing when current interest rates are low, allowing borrowers to lock in a favorable rate for the life of the loan. It's an excellent choice for individuals or families who plan to stay in their home for many years and want to avoid the uncertainty of fluctuating payments.

Fixed-Rate vs. Adjustable-Rate Mortgages (ARMs)

The fundamental difference between a fixed-rate mortgage and an adjustable-rate mortgage (ARM) lies in how their interest rates are determined over time. A fixed-rate mortgage offers unwavering interest payments, shielding you from potential rate hikes in the market. This certainty comes at the cost of not benefiting if market rates drop, though you can often refinance if rates fall significantly.

In contrast, an ARM typically starts with a lower, fixed interest rate for an initial period (e.g., 3, 5, 7, or 10 years), after which the rate adjusts periodically based on a benchmark index. This means an ARM's monthly payment can increase or decrease over time. While ARMs can offer lower initial payments and potential savings if rates fall, they expose borrowers to the risk of significantly higher payments if rates rise. Fixed-rate mortgages eliminate this interest rate risk, offering peace of mind at a potentially higher initial rate than an ARM's introductory period.

Can I refinance a fixed-rate mortgage?

Yes, you can refinance a fixed-rate mortgage. Many homeowners choose to do so if market interest rates drop significantly, allowing them to secure an even lower fixed rate, or if they want to change their loan term or access home equity.

Are fixed-rate mortgages always the best choice?

Not always. While they offer stability, whether a fixed-rate mortgage is the best choice depends on market conditions, your personal financial situation, and how long you plan to stay in the home. If you expect to move within a few years, an ARM with a low introductory rate might be more suitable, despite its rate-adjustment risk.

What are common fixed-rate mortgage terms?

The most common fixed-rate mortgage terms are 15 years and 30 years. A 15-year term typically has higher monthly payments but allows you to pay off the loan faster and pay less interest overall. A 30-year term offers lower monthly payments but results in more interest paid over the life of the loan.

Does my monthly payment ever change with a fixed-rate mortgage?

The principal and interest portion of your monthly payment remains constant. However, your total monthly payment can still change if the amounts collected for your property taxes or homeowner's insurance (held in an escrow account) increase or decrease. These components are not fixed by the mortgage itself.