Fixed vs. Adjustable-Rate Mortgages: Which One Saves You More?

by | Feb 26, 2025 | Mortgage Rates

A clean, side-by-side table comparing Fixed-Rate Mortgages (FRMs) and Adjustable-Rate Mortgages (ARMs). The table highlights key features such as initial interest rates, monthly payments in the first five years, payment adjustments, total interest paid over 30 years, and the best type of buyer for each mortgage. The FRM column shows stable payments with higher initial interest rates, while the ARM column indicates lower initial payments but potential rate increases over time. The table is structured for easy readability and decision-making.

Buying a home in Boston is a big step, and choosing the right mortgage can make a huge difference in how much you pay over time. Two common options are fixed-rate mortgages (FRMs) and adjustable-rate mortgages (ARMs). Each has pros and cons, and the right choice depends on your financial situation, long-term plans, and risk tolerance. Let’s break it down to see which option could save you more.

A clean, side-by-side table comparing Fixed-Rate Mortgages (FRMs) and Adjustable-Rate Mortgages (ARMs). The table highlights key features such as initial interest rates, monthly payments in the first five years, payment adjustments, total interest paid over 30 years, and the best type of buyer for each mortgage. The FRM column shows stable payments with higher initial interest rates, while the ARM column indicates lower initial payments but potential rate increases over time. The table is structured for easy readability and decision-making.

Disclaimer: This blog is for informational purposes only and does not constitute financial or legal advice. Always consult with a mortgage professional, financial advisor, or real estate lawyer before making mortgage decisions.

What Is a Fixed-Rate Mortgage (FRM)?

A fixed-rate mortgage is exactly what it sounds like—the interest rate stays the same for the entire loan term. Whether you choose a 15-year, 20-year, or 30-year loan, your monthly principal and interest payments remain predictable.

Pros of Fixed-Rate Mortgages

  • Predictability – Your monthly payments won’t change, making it easier to budget.
  • Protection from rate hikes – Even if interest rates rise, your rate stays the same.
  • Good for long-term homeowners – If you plan to stay in your home for many years, a fixed-rate mortgage is often a smart choice.

Cons of Fixed-Rate Mortgages

  • Higher initial interest rates – Fixed rates tend to start higher than adjustable rates.
  • Less flexibility – If rates drop significantly, refinancing may be your only option to get a lower rate.

 

What Is an Adjustable-Rate Mortgage (ARM)?

An adjustable-rate mortgage (ARM) starts with a lower interest rate for an initial period (such as 5, 7, or 10 years) and then adjusts periodically based on market rates. A 5/1 ARM, for example, has a fixed rate for five years, then adjusts annually after that. 

Pros of Adjustable-Rate Mortgages

  • Lower initial interest rates – ARMs typically start with lower rates than fixed mortgages, meaning lower initial payments.
  • Ideal for short-term homeowners – If you plan to sell before the fixed-rate period ends, you could save thousands.
  • Potential savings if rates drop – If interest rates decrease, your payments could go down without needing to refinance.

Cons of Adjustable-Rate Mortgages

  • Unpredictability – Your rate (and monthly payment) can rise after the fixed period.
  • Higher risk – If rates increase significantly, your payment could become unaffordable.
  • Not ideal for long-term buyers – If you plan to stay in your home for 10+ years, an ARM could cost you more in the long run.

Important Note: After the fixed-rate period, your rate may adjust upward based on market conditions. Some borrowers may face significant payment increases, which could lead to financial strain. Always review the loan terms carefully before choosing an ARM.

 

Cost Comparison: Which One Saves You More?

Let’s look at a basic example to see how costs compare between an FRM and an ARM in Boston.

A cost comparison table of Fixed-Rate Mortgages (FRMs) and Adjustable-Rate Mortgages (ARMs) in Boston, showing initial interest rates, monthly payments for the first five years, estimated payment adjustments, and total interest paid over 30 years.

Key Takeaways:

  • The ARM saves about $360 per month during the first five years, totaling $21,600 in savings.
  • If rates rise after year five, the monthly payment could increase.
  • If rates stay stable or drop, an ARM could be the better deal.

Interest rates are subject to change and vary by lender. Always consult with a mortgage professional for current rates.

With home affordability shifting across the state, buyers should consider how market trends in Massachusetts real estate impact mortgage rates and financing options.

Who Should Choose a Fixed-Rate Mortgage?

A fixed-rate mortgage is best for buyers who:

  • Plan to stay in their home for 10+ years.
  • Want predictable payments for easier budgeting.
  • Expect interest rates to rise in the future.

Beyond the mortgage itself, selecting a home with valuable home features in Massachusetts can ensure your investment remains profitable over time.

Who Should Choose an Adjustable-Rate Mortgage?

An adjustable-rate mortgage is best for buyers who:

  • Plan to sell or refinance within 5–10 years.
  • Want a lower initial payment.
  • Are comfortable with some level of risk in exchange for potential savings.

For homebuyers purchasing remotely, evaluating mortgage strategies for remote buyers ensures they secure the best financing option without in-person consultations.

Prepayment Penalties and Refinancing Fees

If you choose an ARM and plan to refinance or sell before the adjustment period begins, be aware that some mortgage agreements include prepayment penalties or refinancing fees. These fees can affect your overall savings. Always review your loan agreement to understand potential costs.

Final Verdict: Which One Saves You More?

  • Short-term buyers – An ARM can save you thousands in the early years.
  • Long-term buyers – A fixed-rate mortgage provides stability and protection.
  • Market factors matter – If rates are low, locking in a fixed rate may be the safest bet.

Choosing between a fixed-rate and adjustable-rate mortgage depends on your financial goals and how long you plan to stay in your home. Need help deciding? Contact Centre Realty Group—we’ll guide you through the mortgage process and help you find the best loan for your needs. Since mortgage rates fluctuate over time, deciding between a fixed-rate or adjustable-rate loan often depends on current market conditions and long-term trends.