Power of Interest

How Amortization Changes With Loan Term Lengths (15 vs. 30 Years)

The loan term — how long you take to repay — dramatically affects your monthly payment, interest costs, and how fast you build equity.

🔍 Let’s Compare:

$300,000 loan at 6% interest

Loan Term Monthly Payment Total Interest Paid Total Cost of Loan
30 Years ~$1,798 ~$347,515 ~$647,515
15 Years ~$2,532 ~$155,682 ~$455,682

💥 That’s nearly $192,000 more interest for the 30-year loan!

📉 30-Year Loan: Slower Amortization

  • Lower monthly payments, easier on the budget

  • Pay mostly interest in early years

  • Takes longer to build equity

  • Total interest is much higher

📈 15-Year Loan: Faster Amortization

  • Higher monthly payments

  • Pay off principal much faster

  • Build equity quickly

  • Save a lot in interest

🔁 Payment Breakdown Example (Early Year):

Loan Term Month 1 Interest Month 1 Principal
30 Years $1,500 $298
15 Years $1,500 $1,032

Notice how with the 15-year loan, much more goes toward the principal right away.

✅ What’s Best for You?

If You Want… Consider…
Lower monthly payments 30-year loan
To pay less interest overall 15-year loan
To build equity faster 15-year loan
More flexibility (can pay extra later) 30-year, then prepay

💡 Tip:

Even with a 30-year loan, you can pay it off like a 15-year by making extra principal payments — without being locked into the higher monthly cost.

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