How to Reduce Total Interest Paid on a Loan

Why total interest matters

On a $200K mortgage at 6.5% over 30 years, you'll pay about $255,000 in interest — more than the loan itself. Even small reductions translate to tens of thousands of dollars saved.

1. Choose a shorter loan term

30-year vs 15-year on a $200K mortgage at the going rate (about 0.5% lower for 15-year):

• 30-year at 6.5%: $1,264/month, ~$255K total interest
• 15-year at 6.0%: $1,688/month, ~$104K total interest
• Savings: $151,000 in total interest

2. Make extra principal payments

Even small extras compound. On the same $200K, 6.5%, 30-year mortgage:

• Extra $100/month: paid off ~5 years early, saves ~$57,000
• Extra $200/month: paid off ~8 years early, saves ~$93,000
• Extra $500/month: paid off ~13 years early, saves ~$144,000

3. Make biweekly payments

Pay half your monthly payment every 2 weeks. You end up making 26 half-payments per year, which equals 13 monthly payments instead of 12. On a 30-year mortgage, this typically cuts the loan by 4–5 years and saves $40K–$70K in interest.

4. Refinance when rates drop

A 1% rate drop on a $200K mortgage saves roughly $40,000 over 30 years. Rule of thumb: refinance when rates drop 1%+ below your current rate AND you'll stay in the home long enough to recoup closing costs (usually 2–4 years).

5. Make one extra full payment per year

Use a tax refund or bonus to make one extra full payment annually. On a 30-year mortgage, this cuts about 5 years off the loan and saves $50K+ in interest.

6. Recast the mortgage after a lump sum

Some lenders allow you to make a large principal payment and then re-amortize the loan, lowering your monthly payment without refinancing. Usually a small fee. Lowers monthly cost and total interest.

7. Avoid restarting the clock

Each time you refinance into a new 30-year loan, you reset the amortization. The savings can disappear if you do it too often. Refinance to a shorter term (e.g. 30→20 year) when possible.

8. Improve your credit before borrowing

Going from a 680 credit score to a 760+ score can save 0.5–1% on the rate. On a $200K mortgage, that's $40K–$80K in interest. Pay down credit cards and avoid new accounts in the 6 months before applying.

Stack multiple strategies

Combining a 25-year refinance, biweekly schedule, and an extra $100/month on a $200K mortgage at 6.5% can cut total interest from $255K down to about $90K — a $165K saving on a single loan.

Use the calculator

Frequently Asked Questions