Biweekly Mortgage Payments vs. Monthly: Does It Really Save Interest?

With a standard monthly mortgage, you make 12 payments per year. With biweekly payments, you pay half your monthly amount every two weeks.

Since there are 52 weeks in a year, that's 26 half-payments — or 13 full payments instead of 12.

That one extra payment goes entirely toward principal, accelerating your payoff and reducing total interest.

Example on a $300,000 mortgage at 6.5% for 30 years:

• Monthly payment: $1,896
• Biweekly payment: $948 (half of monthly)
• Extra annual principal: $1,896

This seemingly small change can have a dramatic impact over the life of the loan.

Let's run the numbers on a $300,000 mortgage at 6.5%:

Monthly payments (standard):

• Total interest paid: $383,139
• Payoff: 30 years

Biweekly payments:

• Total interest paid: $325,460
• Payoff: ~25 years

Savings: $57,679 in interest and 5 years off the loan

The savings come from two factors:

1. One extra payment per year — reduces principal faster
2. More frequent payments — slightly less interest accrues between payments since principal is reduced sooner

The higher your interest rate, the more you save. At 7.5%, the savings can exceed $75,000.

Many companies offer to set up biweekly payments for a fee ($200–$400 setup plus monthly charges). Don't pay for this.

You can achieve the same result for free:

Option 1: DIY extra payment

Divide your monthly payment by 12. Add that amount to each monthly payment as extra principal.

Example: $1,896 / 12 = $158. Pay $2,054 each month ($1,896 + $158 extra principal).

Option 2: Annual lump sum

Make one extra mortgage payment per year, designated as principal only. Many people do this with a tax refund or year-end bonus.

Option 3: True biweekly through your lender

Some lenders offer free biweekly payment schedules. Ask your servicer — but make sure there are no fees.

All three methods produce nearly identical results. The key is consistency.

Biweekly payments aren't always the best use of extra cash. Consider these scenarios:

• High-interest debt — Credit cards at 20%+ should be paid off before accelerating a 6% mortgage.
• No emergency fund — Build 3–6 months of expenses before making extra payments.
• Low mortgage rate — If your rate is under 4%, investing the extra payment in an index fund (historically ~10% annual returns) likely produces better long-term results.
• Retirement under-saving — Max out your 401(k) match before accelerating your mortgage.

The math favors paying off the highest-interest obligations first. But the psychological benefit of a faster mortgage payoff is real — if it helps you stay motivated, it's a valid choice.