Understanding Amortization: How Your Mortgage Payment Works

Ever wonder why your loan balance barely moves in the first years? That's amortization at work.

What is Amortization?

Amortization is the process of paying off a loan through regular payments that cover both principal and interest.

How It Works

With each payment:

• Part pays interest on remaining balance
• Part pays down principal
• Total payment stays the same (fixed-rate)
• Ratio of interest to principal changes over time

Why Early Payments Are Mostly Interest

Interest is calculated on remaining balance:

• Large balance = large interest portion
• As balance decreases, interest portion shrinks
• Principal portion grows automatically

Example: $300,000 loan at 6% for 30 years

Month 1:

• Payment: $1,798.65
• Interest: $1,500.00
• Principal: $298.65

Year 15 (Month 180):

• Payment: $1,798.65
• Interest: $857.51
• Principal: $941.14

Month 360:

• Payment: $1,798.65
• Interest: $8.93
• Principal: $1,789.72

The Amortization Schedule

An amortization schedule shows every payment over the loan life:

• Payment number
• Principal portion
• Interest portion
• Total paid to date
• Remaining balance

Strategies to Pay Off Faster

1. Extra Principal Payments

Even small extra amounts help:

• $100 extra/month on $300,000 loan at 6%
• Saves $51,000+ in interest
• Pays off 4.5 years early

2. Biweekly Payments

Pay half your payment every two weeks:

• Results in 13 full payments per year
• Shaves years off your loan

3. Round Up Payments

Round up to nearest $50 or $100:

• Easy to budget
• Adds up over time

4. Lump Sum Payments

Apply bonuses, tax refunds, or windfalls to principal.

Short vs. Long-Term Loans

15-year example ($300,000 at 5.5%):

• Monthly: $2,451 (vs $1,703 for 30-yr)
• Total interest: $141,000 (vs $313,000)
• Savings: $172,000

View Your Amortization

See exactly how your payments will break down using our Amortization Calculator.