Mortgage guide

Biweekly vs monthly mortgage payments: what you really save

By Sergio Ruiz · Last reviewed: October 9, 2026 · Covers U.S. rules

The short answer

Paying half of your mortgage payment every two weeks makes 13 full payments a year instead of 12. On a $300,000, 30-year mortgage at 6.5%, that saves roughly $84,000 to $88,000 in interest and about 5 years and 8 months to 5 years and 10 months, depending on how your servicer credits the half payments. You can get nearly the same result for free by adding one-twelfth of your payment to each monthly payment.

Why biweekly payments save money

There are 52 weeks in a year, so a payment every two weeks happens 26 times. If each one is half of your monthly payment, you send 26 half payments, which equals 13 full payments. The extra payment goes to principal, and every dollar of principal you remove stops generating interest for the rest of the loan.

The saving is almost entirely the extra payment, not the calendar. For the details of that effect, see One extra mortgage payment a year: how much does it save?

How much does it save?

The answer depends on when your servicer credits each half payment. This table compares two cases on a new $300,000, 30-year fixed-rate loan:

Case A, held and applied monthly: the servicer applies payments once a month, so the 13th payment is applied once a year (here, each December).
Case B, credited on receipt: each half payment reduces the balance the day it arrives.

Rate	Monthly payment	Case A: interest saved / time saved	Case B: interest saved / time saved
5.5%	$1,703.37	$59,301 / 4 yr 11 mo	$62,255 / 5 yr 1 mo
6.5%	$1,896.20	$83,985 / 5 yr 8 mo	$88,122 / 5 yr 10 mo
7.5%	$2,097.64	$114,718 / 6 yr 5 mo	$120,297 / 6 yr 8 mo

Assumptions: new $300,000 loan, 30-year fixed rate, no other extra payments. In Case B the half payment is 50% of the monthly payment, 26 times a year, with interest accruing at the annual rate divided by 26 each period, which is a simplification of how a lender may calculate interest. Method: How the calculator works.

Case B saves a little more because the money arrives sooner, the same timing effect that makes a January extra payment worth more than a December one.

A free way to get the same result

You do not need a biweekly program to make 13 payments a year. On the $300,000 loan at 6.5%, each option below makes one extra payment's worth of principal reduction a year:

How you pay the extra	Interest saved	Time saved
13th payment ($1,896.20) every December	$83,985	5 yr 8 mo
13th payment ($1,896.20) every January	$90,553	5 yr 11 mo
$158.02 added to each monthly payment	$87,256	5 yr 10 mo
Biweekly, each half payment credited on receipt	$88,122	5 yr 10 mo

$158.02 is one-twelfth of the monthly payment. All options apply the extra amount to principal.

Adding $158.02 to each monthly payment comes within about $900 of a biweekly plan that credits every half payment on receipt, and it needs no enrollment, no third party and no change in how your servicer processes payments.

What your servicer does with half payments

A half payment is a partial payment, because it is less than the periodic payment due. The official commentary to the federal servicing rule (12 CFR 1026.36(c)(1)(ii), comment 1) says that, to the extent not prohibited by law or by the legal obligation between the parties, a servicer may credit a partial payment upon receipt, return it to the consumer, or hold it in a suspense or unapplied funds account. A held payment must appear on your periodic statement, and once enough has accumulated to cover a periodic payment, the funds must be treated as a periodic payment received. In other words, your servicer and your loan contract decide whether you are in Case A, Case B or neither.

Ask your servicer:

Do you offer biweekly payments directly, and is there a fee?
If I send half my payment every two weeks, is each one credited on the day you receive it?
Will you hold half payments in a suspense account until I have paid a full one?
How can I confirm on my statement that the extra money was applied to principal?

For how to designate and verify extra money, read Principal-only payment: how to make sure extra money counts.

Watch out for paid biweekly programs

Some companies other than your lender offer to collect biweekly payments for you and send them on. In 2015 the CFPB sued one such administrator, alleging a setup fee of up to $995 and processing fees of $84 to $101 a year, and that many enrolled consumers would save little or nothing. The complaint was an allegation and not a finding by a court.

To see what fees like these would mean on the loan above, suppose a program charged $995 to enroll and $91 a year (a figure inside that range). The comparison below puts the interest you avoid against the fees you pay, using Case B:

After	Interest avoided so far	Hypothetical fees paid
1 year	$65	$1,086
3 years	$601	$1,268
5 years	$1,738	$1,450
10 years	$7,791	$1,905

Illustration only: the fee amounts are hypothetical and based on figures alleged in the 2015 complaint, not on any current program. Interest avoided = interest a monthly schedule would have charged through that year minus interest charged in Case B.

On this loan the hypothetical fees are recovered in the fifth year, and over the life of the loan the interest saved would far exceed them. But the same savings are available for free, and the early years show how slowly the benefit builds. The question to ask is not whether a plan saves money; it is whether paying someone else to do what you can do yourself is worth it.

Before you start

Check for a prepayment penalty. The CFPB says penalties do not normally apply if you pay extra principal in small chunks, but recommends confirming with your lender. See Prepayment penalty: what it is and how to check yours.
Pick the easiest schedule you can keep. If you are paid every two weeks, a biweekly rhythm may fit your budget. If not, adding one-twelfth of your payment to each monthly payment does the same job.
Keep a safety net. Money sent to a mortgage is hard to get back, so keep an emergency fund first.

Frequently asked questions

How much do biweekly mortgage payments save?

On a $300,000, 30-year mortgage at 6.5%, biweekly payments save roughly $84,000 to $88,000 in interest and cut about 5 years and 8 months to 5 years and 10 months, depending on how your servicer credits the half payments.

Why do biweekly payments pay off a mortgage faster?

Half a payment every two weeks adds up to 26 half payments, or 13 full payments, a year instead of 12. That is one extra payment a year, and money that reaches the balance sooner also saves more interest.

Can I get the same result without a biweekly plan?

Yes. On the same loan, adding one-twelfth of your monthly payment ($158.02) to each payment saves about $87,256 and 5 years and 10 months, with no program and no fees.

Will my servicer accept half payments?

It depends on the servicer. Federal rules allow a servicer to hold a partial payment in a suspense account until enough accumulates to make a full payment, as long as it is disclosed on your statement. Ask whether half payments are credited when received and whether there is a fee.

Related guides

Try your own numbers. Enter your loan and add a yearly or monthly extra payment to compare the options above.

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Sources and method

Consumer Financial Protection Bureau, CFPB files suit against a biweekly payment administrator (press release, May 11, 2015; archived). The complaint is not a finding that the law was violated.
Consumer Financial Protection Bureau, 12 CFR § 1026.36, Prohibited acts or practices and certain requirements for credit secured by a dwelling, paragraph (c)(1), Payment processing, and the official interpretation, comment 36(c)(1)(ii)-1, Handling of partial payments.
Consumer Financial Protection Bureau, What is a prepayment penalty? (reviewed September 11, 2024).
Figures were calculated with the Financial Accelerator engine and a biweekly model described in the table notes (see methodology).

This page is educational, covers U.S. rules, and is not legal or financial advice. How a servicer processes half payments varies; confirm the terms of your own loan with your servicer.