Fixed-Rate Mortgages vs Adjustable-Rate Mortgages (ARM): Key Differences and Features
When purchasing or refinancing a home in the United States, one of the most important decisions is choosing the right mortgage interest rate structure. For primary residences, many borrowers prefer the stability and long-term predictability of a Fixed-Rate Mortgage. However, depending on a person’s financial situation, future plans, and expected income growth, an Adjustable-Rate Mortgage (ARM) may also be worth considering.
• Fixed-Rate Mortgage
• Adjustable-Rate Mortgage (ARM)
These are two different mortgage structures, each with its own advantages and disadvantages. Today, we will explain the key features and differences between the two options.
1. Fixed-Rate Mortgage
A Fixed-Rate Mortgage is exactly what the name suggests — the interest rate remains the same throughout the life of the loan.
Example:
30-Year Fixed at 6.5%
→ Interest rate remains the same for 30 years
→ Principal & Interest (P&I) payment stays mostly consistent
Advantages:
✅ Stable Monthly Payments
Because the payment amount remains similar every month, budgeting becomes easier.
✅ No Risk of Rising Interest Rates
Even if market interest rates increase, your mortgage rate does not change.
✅ Ideal for Long-Term Homeownership
If you plan to stay in the home for many years, fixed-rate mortgages provide greater stability.
✅ Peace of Mind
You can make long-term financial plans without worrying about future rate changes.
Disadvantages:
❌ Initial Interest Rate May Be Higher Than ARM
Fixed-rate mortgages often start with a slightly higher interest rate compared to ARMs.
❌ Higher Initial Monthly Payment
For the same home, the monthly payment may initially be higher than an ARM loan.
2. Adjustable-Rate Mortgage (ARM)
An ARM loan keeps the interest rate fixed for an initial period and then adjusts periodically based on market conditions.
Example:
5/6 ARM
→ Fixed for the first 5 years
→ Interest rate may adjust every 6 months afterward
Advantages:
✅ Lower Initial Interest Rate
ARM loans often begin with a lower rate compared to a 30-year fixed mortgage.
✅ Lower Initial Monthly Payment
Because the starting rate is lower, monthly payments may also be lower in the beginning.
✅ Beneficial for Short-Term Ownership Plans
It may work well if you plan to move or refinance within several years.
✅ Improved Early Cash Flow
Lower payments may help borrowers who want additional cash flow for business investments or other financial goals.
Disadvantages:
❌ Interest Rate May Increase
After the fixed period ends, the rate can increase depending on market conditions.
❌ Monthly Payment May Increase
If rates rise, monthly mortgage payments may also increase.
❌ Less Long-Term Stability
Future housing costs become harder to predict over time.
📌 Examples of ARM Programs
• 5/6 ARM
→ Fixed for 5 years, then adjusts every 6 months
• 7/6 ARM
→ Fixed for 7 years, then adjusts every 6 months
• 10/6 ARM
→ Fixed for 10 years, then adjusts every 6 months
3. Fixed Rate vs Adjustable Rate Comparison
✔ Fixed Rate
• Higher stability
• Better for long-term homeowners
• Easier budgeting
• Initial interest rate may be slightly higher
✔ Adjustable Rate
• Potentially lower starting rate
• Lower initial monthly payments
• Better for short-term ownership
• Future rate increase risk exists
📌 Example: Fixed Rate vs ARM Payment Comparison
Let’s assume you are purchasing a $500,000 home with a 20% down payment.
Loan Amount:
$400,000
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🏡 30-Year Fixed Example
Interest Rate: 6.75%
Principal + Interest (P&I)
Approximately $2,594 / month
✔ Same interest rate for 30 years
✔ Stable monthly payment
✔ Better for long-term ownership
━━━━━━━━━━━━━━━
🏡 5/6 ARM Example
Initial Interest Rate: 5.875%
Principal + Interest (P&I)
Approximately $2,366 / month
✔ Saves about $228 per month initially
✔ Fixed rate for the first 5 years
✔ May adjust every 6 months afterward
━━━━━━━━━━━━━━━
📌 Payment Difference Comparison
30-Year Fixed:
Approximately $2,594 / month
5/6 ARM:
Approximately $2,366 / month
➡ Initial Monthly Savings:
About $228 per month
➡ Annual Savings:
About $2,736
➡ 5-Year Savings:
About $13,680
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⚠ Important Consideration
ARM rates may adjust after the fixed period based on market interest rates.
For example:
If rates increase after 5 years:
• Monthly payments may increase
• Total interest costs may increase
On the other hand:
• If rates decrease
• Or if you refinance later
An ARM may become more beneficial.
📌 When an ARM May Be Beneficial:
✔ Planning to move within 5–7 years
✔ Expecting to refinance later
✔ Wanting lower initial monthly payments
✔ Expecting future income growth
📌 When a Fixed Rate May Be Better:
✔ Planning to stay long term
✔ Prefer stable monthly payments
✔ Want to avoid future interest rate risk
📌 Important Notes:
Actual mortgage rates depend on many factors, including:
• Credit score
• Down payment amount
• Debt-to-Income ratio (DTI)
• Loan program type
• Market conditions
Therefore, comparing options based on your personal financial situation is extremely important.
Terry Kwon
Phone: (631) 624-4480
Email: terry@milestonepointinc.com
Funding Director at Milestone Point, Inc.
Licensed Mortgage Originator at Loan Factory
NMLS #2620208
Loan Factory NMLS #320841