Biweekly Mortgage

What is a Biweekly Mortgage Payment Schedule?

A biweekly mortgage schedule is an accelerated loan repayment strategy where you make half of your standard monthly mortgage payment every two weeks. Because there are 52 weeks in a calendar year, you will make 26 half-payments. This totals 13 full monthly payments over a 12-month period, effectively adding one extra monthly payment each year.

The extra payment goes directly toward reducing your principal loan balance. By steadily lowering the principal, you reduce the base on which interest is calculated, saving tens of thousands of dollars over the lifetime of the mortgage and shaving years off your repayment timeline.

Monthly vs. Biweekly Mortgage Math

To understand the direct benefit of a biweekly schedule, let's look at the mathematics behind standard amortization.

The standard monthly mortgage payment ($M_m$) is calculated using the traditional amortization formula:

$$M_m = P \frac{r_m(1+r_m)^{n_m}}{(1+r_m)^{n_m} - 1}$$

Where:

• P is the principal loan amount.
• $r_m$ is the monthly interest rate (annual interest rate divided by 12).
• $n_m$ is the total number of monthly payments (term in years multiplied by 12).

In a standard biweekly mortgage program, your biweekly payment is calculated as:

$$M_b = \frac{M_m}{2}$$

Interest is computed per biweekly period based on the outstanding principal balance:

$$I_b = \text{Balance} \times \frac{\text{Annual Interest Rate}}{26}$$

Since you make 26 biweekly payments annually (equivalent to 13 monthly payments), the outstanding principal balance decreases faster than it does on a standard 12-payment-per-year schedule. To calculate your regular monthly payments first, check out our standard Mortgage Calculator.

Why Biweekly Payments Save You Money

The primary driver of savings is the acceleration of principal paydown. By paying down the principal early:

1. Fewer Compounding Periods: You reduce the remaining principal faster, meaning less interest accumulates in each subsequent payment period.
2. Shorter Loan Term: On a standard 30-year fixed mortgage, switching to a biweekly payment schedule typically reduces the payoff term to around 24 to 26 years, depending on the interest rate.
3. Pure Interest Savings: The total amount paid over the life of the loan drops drastically. For example, on a $250,000 mortgage at 6% interest, you can save over $70,000 in interest alone. For more customization on early payoffs, you can explore the Mortgage Payoff Calculator.

Important Considerations Before Switching

While the benefits are clear, it is important to understand how your lender handles biweekly programs:

• Lender Alignment: Some lenders do not support actual biweekly amortization. Instead, they hold the first half-payment in a non-interest-bearing account and apply the full payment once the second half arrives. Ensure your lender applies payments immediately upon receipt.
• Biweekly Transaction Fees: Some third-party administrators charge setup or transactional fees to run biweekly programs. These fees can dilute your interest savings. You can often achieve the same results for free by making one extra monthly payment manually each year or adding 1/12th of your payment to your monthly check.
• Prepayment Penalties: Confirm that your mortgage does not contain prepayment penalties that restrict you from paying off the principal ahead of schedule.