Fixed vs Adjustable Mortgage

Compare stability vs flexibility. Understand rate caps, initial savings, and long-term risks to choose your ideal home loan.

🏠 Fixed-Rate Mortgage

Rate stays the same for entire loan term

✅ Pros:

Predictable payments — never change
Protection from rising interest rates
Ideal for long-term homeowners (7+ years)

⚠️ Cons:

Higher initial rate than ARM intro rates
Refinancing needed to benefit from rate drops

Best for: Stability seekers, families, 10+ year stay

📊 Adjustable-Rate Mortgage (ARM)

5/1, 7/1, 10/1 ARM — fixed intro period, then adjusts

✅ Pros:

Lower initial rate (0.5-1.5% below fixed)
Great if moving within 5-7 years
Rate caps limit maximum increase

⚠️ Cons:

Payments can increase after fixed period
Risk if rates rise significantly
Complexity: caps, indexes, margins

Best for: Short-term owners, rate-drop gamblers, lower initial payments

📊 Fixed vs ARM: Real Cost Comparison

Loan Amount ($)

Fixed Rate (%)

ARM Initial Rate (%)

ARM Fixed Period (years)

ARM Adjustment Cap (max per adjustment)

ARM Lifetime Cap (max over life)

Years in Home (holding period)

Fixed Monthly Payment:
$0

ARM Initial Payment:
$0

Total Interest (Fixed, 30yr):
$0

Total Cost Over Holding Period:
$0

⚠️ ARM payments adjust after fixed period. This simulation assumes worst-case rate caps for illustration.

🔒 Understanding ARM Rate Caps

Initial Cap
First adjustment limit (typically 2-5%)

Periodic Cap
Per adjustment max (usually 1-2%)

Lifetime Cap
Maximum rate over loan life (usually 5-6% above start)

Index + Margin
ARM rate = Index (SOFR) + Margin (2.25-3%)

💡 Example: 5/1 ARM with 5.75% start, 2% periodic cap, 5% lifetime cap → max rate 10.75%.

🤔 Which Mortgage Is Right for You?

Choose Fixed-Rate if: You plan to stay 10+ years, want payment certainty, or rates are historically low.
Choose ARM if: You'll move/sell within 5-7 years, expect income to rise, or want lower initial payments to invest difference.
Consider Hybrid: Some borrowers take ARM for lower payments, then refinance to fixed before adjustment period ends.

❓ Fixed vs ARM Mortgage FAQs

What is a 5/1 ARM? +

A 5/1 ARM has a fixed rate for the first 5 years, then adjusts annually (the "1" means once per year) based on an index plus margin.

Can I refinance an ARM to a fixed-rate later? +

Yes, many homeowners refinance before the adjustment period ends. However, if rates have risen significantly, your new fixed rate may be higher than the original ARM start rate.

How much lower are ARM rates than fixed? +

Typically 0.5% to 1.5% lower initially. On a $300,000 loan, that's $90–$270 less per month in early years.

What happens when my ARM adjusts? +

Lender recalculates payment based on current index + margin, subject to caps. Your payment could go up, down, or stay same depending on rate environment.