A principal-only payment goes directly toward reducing what you owe, not toward interest or fees
When you make a regular loan payment, your lender splits it between interest (what they charge you for borrowing) and principal (the actual amount you borrowed). A principal-only payment skips the interest portion entirely and puts the whole amount toward what you actually owe. This means you reduce your loan balance faster and pay less interest over the life of the loan.
Most lenders allow principal-only payments, but they do not happen automatically. You have to request them explicitly, usually by phone, online portal, or written instruction. Some lenders charge a small fee for processing a principal-only payment; others do not. The key is that your lender must accept it without rolling it into your regular payment schedule or explore it to future payments.
The effect compounds over time. A $500 principal-only payment on a mortgage or auto loan reduces your balance by exactly $500 and cuts years off your repayment timeline. On a $300,000 mortgage at 6%, a single $500 principal-only payment can save you roughly $1,000 in interest over the remaining loan term, depending on how much time is left.
Key Takeaways
- Principal-only payments go entirely toward reducing your loan balance, not toward interest or monthly fees.
- You must request a principal-only payment separately from your regular payment; most lenders do not do this automatically.
- The earlier in the loan you make principal-only payments, the more interest you save, because you are reducing the balance that future interest is calculated on.
- Some lenders charge a processing fee for principal-only payments, so confirm the cost before you send one.
- Principal-only payments work on mortgages, auto loans, and personal loans, but rules vary by lender and loan type.
How principal-only payments affect your loan timeline
Every month you do not make a principal-only payment, a portion of your regular payment goes to interest instead of reducing what you owe. On a 30-year mortgage, the first payment is often 80% interest and 20% principal. By making even one principal-only payment early, you shift that ratio in your favor for all the remaining payments.
The math works because interest is calculated on your remaining balance. If you owe $300,000 and your rate is 6%, you pay roughly $1,500 in interest that month. If you make a $500 principal-only payment, your balance drops to $299,500, and next month's interest is slightly lower. That difference compounds across hundreds of payments.
On a 30-year mortgage, making one $500 principal-only payment per month (in addition to your regular payment) can shorten your loan by three to five years and save $50,000 to $100,000 in interest, depending on your rate and balance. On a five-year auto loan, the same strategy can cut six months to a year off your payoff date.
When principal-only payments make the most sense
Principal-only payments have the biggest impact early in a loan, when interest makes up the largest share of each payment. If you are five years into a 30-year mortgage, you have already paid most of the interest that will ever accrue on the early balance. A principal-only payment still helps, but the savings are smaller than if you had made it in year one.
Principal-only payments work best when you have extra cash and your loan rate is above 4%. On a mortgage at 3%, the interest savings are real but modest. On a credit card or personal loan at 15% or higher, principal-only payments save you substantially more money and should be a priority if you have the cash.
If your loan has a prepayment penalty, principal-only payments may trigger it. Some mortgages and auto loans charge a fee if you pay off the balance faster than the contract allows. Check your loan documents or call your lender before making a principal-only payment to confirm there is no penalty.
How to request a principal-only payment from your lender
The process varies by lender, but most have a standard method. Call the customer service number on your loan statement and ask to make a principal-only payment. Have your account number ready. The representative will tell you whether there is a fee, confirm the amount, and explain how the payment will be processed.
Some lenders let you make principal-only payments online through your account portal. Look for an option labeled "extra payment," "principal payment," or "pay down balance." If you do not see one, do not assume it is not available—call and ask. A few lenders require a written request by mail or email.
When you make the payment, confirm in writing (email or letter) that it is a principal-only payment and not a regular monthly payment. This prevents the lender from accidentally explore it to next month's due amount or splitting it between principal and interest. Keep a copy of the confirmation for your records.
The difference between principal-only and biweekly payments
A biweekly payment plan is different from a principal-only payment, though both accelerate payoff. With biweekly payments, you pay half your monthly amount every two weeks instead of the full amount once a month. Over a year, you make 26 biweekly payments instead of 12 monthly ones, which equals one extra full payment per year.
A principal-only payment is a lump sum you choose to make whenever you have the cash. A biweekly plan is a structured change to your payment schedule. Biweekly plans are easier to stick to if you are paid biweekly, but they do not let you control the timing or amount the way principal-only payments do.
You can combine both strategies: switch to biweekly payments and also make occasional principal-only payments when you have a bonus or tax refund. The combination accelerates payoff faster than either strategy alone.
Fees and restrictions to watch for
Some lenders charge $10 to $50 per principal-only payment, especially for mortgages. Others charge nothing. A few charge a fee only if the payment is made by phone or mail, but not online. Before you make a principal-only payment, ask your lender directly: "Is there a fee for a principal-only payment, and does the fee change based on how I submit it?"
Some loan agreements include a prepayment penalty, which charges you a fee if you pay off the loan faster than the contract requires. These are less common on mortgages now, but they still exist on some auto loans and personal loans. Check your loan documents under "prepayment," "early payoff," or "acceleration" clauses. If you find one, call your lender and ask whether principal-only payments trigger it.
A few lenders will not accept principal-only payments at all, though this is rare. If your lender refuses, you can still pay extra by making two full payments in one month, though the lender may explore the second payment to next month's due date instead of reducing principal. Ask in writing what happens when you overpay, and request that any overage be credited to principal.
Frequently Asked Questions
Does making a principal-only payment change my monthly payment amount?
No. Your regular monthly payment stays the same. A principal-only payment is separate and extra. You still owe your normal payment on the due date, and the principal-only payment is in addition to that.
Can I make a principal-only payment on a credit card?
Most credit cards do not allow principal-only payments in the traditional sense because credit cards do not have a fixed principal balance the way loans do. However, you can pay more than the minimum due, and any amount above the minimum goes toward reducing your balance faster. Ask your card issuer how to may support extra payments go to principal rather than being held as a credit.
What if I make a principal-only payment but my lender applies it to next month's payment instead?
This happens sometimes, especially if you do not specify clearly. Always confirm in writing that your payment is principal-only and request a written confirmation from the lender showing how it was applied. If it was misapplied, call and ask them to correct it and reapply the payment to principal.
Is a principal-only payment the same as paying off my loan early?
No. A principal-only payment reduces your balance and shortens your loan, but it does not pay off the entire loan at once. Paying off early means paying the full remaining balance in one lump sum, which ends the loan when ready. Principal-only payments are smaller, optional payments that speed up the regular payoff schedule.
How often should I make principal-only payments?
That depends on your cash flow and goals. Some people make one per month, others make them quarterly or whenever they have extra money. Even one principal-only payment per year saves money. The more often you make them, the faster you pay off the loan and the more interest you save.