The biggest cost of buying a home isn't the purchase price — it's the interest you'll pay over decades. A 0.1% rate difference might seem negligible, but on a 30-year mortgage, it adds up to thousands of dollars.
$300,000 mortgage, 30-year term
6.5% vs 6.6% → $7,000+ difference in total interest
That 0.1% adds up more than you think
Mortgage Repayment Methods Explained
The way you structure your mortgage payments has a massive impact on total interest paid.
📊 Fixed Payment
Same monthly payment throughout. Early payments are mostly interest, later ones mostly principal
📉 Fixed Principal
Same principal each month + decreasing interest. Higher initial payments, lower total interest
💰 Interest-Only
Pay only interest monthly, repay all principal at maturity. Highest total interest
Interest Comparison by Rate ($300K, 30 years, fixed payment)
| Rate | Monthly Payment | Total Interest | vs 6.5% |
|---|---|---|---|
| 5.5% | $1,703 | $313K | -$88K |
| 6.0% | $1,799 | $347K | -$54K |
| 6.5% | $1,896 | $382K | Baseline |
| 7.0% | $1,996 | $419K | +$37K |
| 7.5% | $2,098 | $455K | +$73K |
Going from 6.5% to 7.5% adds about $73,000 in total interest — and $200 more per month.
📌 Key insight
Shopping around for just 0.5% lower rate on a $300K mortgage saves you roughly $35,000 over the life of the loan.
Fixed Rate vs Adjustable Rate (ARM)
| Fixed Rate | Adjustable Rate | |
|---|---|---|
| Feature | Rate locked for entire term | Rate adjusts every 6–12 months |
| Best when | Rates are low or rising | Rates are high and expected to fall |
| Initial rate | Usually 0.25–0.5% higher | Usually lower |
| Risk | Miss out if rates drop | Payments spike if rates surge |
5 Ways to Reduce Your Mortgage Interest
🏦
Compare Multiple Lenders
Get quotes from at least 3–5 lenders. Rates vary more than you'd expect.
💰
Improve Your Credit Score
A higher credit score qualifies you for lower rates. Even 20 points can make a difference.
📅
Make Extra Payments
Even one extra payment per year can shave years off your mortgage and save tens of thousands.
🔄
Consider Refinancing
If rates have dropped since you took your loan, refinancing could save you significantly.
Calculate Your Mortgage Payments
Enter your loan amount, interest rate, term, and repayment method to see your monthly payment and total interest instantly. Try different scenarios to find the best option.