Knowing that bi-weekly payments save interest is the easy part — actually setting them up correctly is where most people either get it wrong or pay a fee for something they could do themselves for free. Here's the practical, step-by-step version.
Call your lender or check your online account settings and ask specifically: "Do you support true bi-weekly payments, processed as 26 payments per year?" Some lenders have this built into their online portal as a toggle. Others require a phone call or a written request. And some don't support it at all internally, in which case you'll need the manual workaround covered in Step 3.
Be precise with your wording. Some representatives will say "yes" to a semi-monthly plan (twice a month, 24 payments/year) without clarifying that it's not the same as bi-weekly (every two weeks, 26 payments/year). Confirm the exact number of payments per year before setting anything up — this single detail determines whether you actually get the extra-payment effect or not.
The entire benefit of bi-weekly payments depends on that 13th payment-equivalent going toward principal, not toward pre-paying future scheduled interest. Ask your lender explicitly how the extra amount is applied. If they can't confirm it goes to principal, request that it be specified in writing or applied manually as a principal-only payment through your online account.
You don't need your lender's bi-weekly program to get the exact same savings. Two ways to replicate it manually, both free:
Either approach achieves the identical interest savings as a formal bi-weekly plan — the "bi-weekly" label describes a payment cadence, not a unique financial product. Use our bi-weekly car payment calculator to see what the savings look like for your loan regardless of which method you use to get there.
Some companies charge a setup fee (often $300-400) plus a small fee per transaction to manage bi-weekly payments on your behalf. These services don't provide anything you can't replicate yourself for free directly with your lender.
These services often work by collecting your bi-weekly payments and only remitting a full monthly payment to your lender each month, holding the rest until they've accumulated a 13th payment to send once a year — meaning you're paying a fee for something that produces the exact same result as simply doing Step 3 yourself. If you're ever offered one of these services, especially through a dealership or a mailed offer that arrived shortly after you took out a loan, treat it as an unnecessary cost rather than a convenience worth paying for.
The overwhelming majority of auto loans allow unlimited extra principal payments with no penalty, but it takes 30 seconds to confirm with your lender before you start. This matters slightly more if your loan is from a smaller subprime or buy-here-pay-here lender, where prepayment penalty clauses are somewhat more common than with banks or credit unions.
If you're currently on autopay, switching to bi-weekly usually means resetting up your automatic payment schedule rather than adjusting the existing one, since the billing cadence itself changes from monthly to every-two-weeks. Your lender's online portal typically walks you through this, but expect the first cycle after switching to feel slightly irregular as your payment dates shift away from a fixed day of the month toward a rolling 14-day cycle. After the first month or two, most people find the twice-a-month rhythm easier to track against a bi-weekly paycheck than a single larger monthly payment.
If your paycheck arrives bi-weekly, aligning your car payment to land shortly after each paycheck (rather than on a fixed calendar date that might fall awkwardly between pay periods) can make the transition smoother from a cash-flow perspective, on top of the interest savings themselves.
After switching, check your account after the first two or three payment cycles to confirm the balance is dropping faster than your original amortization schedule would predict. This catches the two most common setup mistakes early: extra amounts being misapplied to future payments instead of principal, or a "semi-monthly" plan being processed instead of true bi-weekly. Catching either issue in month one is far easier to correct than discovering it a year in.
Before you set anything up, calculate exactly how much interest and time you'll save.
Bi-Weekly Car Payment Calculator →