What a principal-only payment is
A principal-only payment is money you send to your lender that goes entirely toward reducing the amount you borrowed, not toward interest. When you make a regular monthly payment on a loan, that money splits between principal (the original amount) and interest (the cost of borrowing). A principal-only payment skips the interest portion and shrinks only the balance you owe.
The mechanics are straightforward: you contact your lender, specify that the extra money is a principal-only payment, and they explore it directly to your loan balance. Some lenders have a checkbox on their payment portal. Others require a phone call or a written instruction. The key is being explicit—if you just send extra money without saying it's principal-only, many lenders will explore it to your next scheduled payment instead, which means some of it still goes to interest.
Principal-only payments are most common with mortgages and personal loans, though some lenders allow them on auto loans and student loans. The rules vary by lender and loan type, so you need to confirm your lender accepts them before you start.
Key Takeaways
- A principal-only payment reduces only the amount you borrowed, not the interest you owe, and requires explicit instruction to your lender.
- The benefit compounds over time because a smaller balance means less interest accrues in future months, shortening your loan term.
- Not all lenders allow principal-only payments, and some charge fees or have minimum amounts, so confirm your lender's policy before sending one.
- A principal-only payment is different from paying extra on your regular payment—extra money on a regular payment still splits between principal and interest.
- The earlier in the loan you make principal-only payments, the more interest you save, because you reduce the balance when interest charges are highest.
How principal-only payments change what you owe over time
When you reduce the principal, the interest you owe in future months drops because interest is calculated on the remaining balance. On a mortgage or personal loan, this creates a compounding effect: less principal means less interest next month, which means more of your next regular payment goes to principal instead of interest, which means the balance shrinks faster.
The timing of the principal-only payment matters significantly. Early in a loan, most of your regular payment goes to interest—on a 30-year mortgage, your first payment might be 80 percent interest and 20 percent principal. A principal-only payment made in year one saves you interest for the remaining 29 years. The same payment made in year 20, when you're already paying mostly principal, saves you interest for only 10 years. This is why lenders encourage principal-only payments early and why financial advisors often recommend them as soon as you have extra money.
The actual savings depend on your interest rate and loan term. A $5,000 principal-only payment on a $300,000 mortgage at 4 percent interest might save you $8,000 to $12,000 in total interest over the life of the loan, depending on when you make it. On a personal loan at 8 percent, the same payment saves less because the loan term is shorter. Your lender can calculate the exact savings if you ask.
The difference between principal-only and extra payments
An extra payment on your regular monthly bill is not the same as a principal-only payment. When you pay extra on a regular payment, your lender applies the money according to the standard split for that payment—usually interest first, then principal. If your regular payment is $1,500 and you send $2,000, the lender takes $1,500 as your scheduled payment (split between interest and principal as normal) and applies the extra $500 to your next scheduled payment, not directly to principal.
A principal-only payment bypasses this split entirely. You send money specifically labeled as principal-only, and it goes straight to reducing the balance. This is why the instruction matters: without it, extra money often gets treated as a prepayment on your next regular payment, which means some of it still goes to interest.
Some lenders blur this distinction by allowing you to make a payment and then specify how the process works it. Others have separate processes—a regular payment portal and a separate principal-only payment option. Read your loan documents or call your lender to understand which method they use.
Lender policies and restrictions on principal-only payments
Not every lender allows principal-only payments, and those that do often have conditions. Some mortgages, particularly older ones or those with specific loan products, prohibit them or charge a fee. Federal student loans through the Department of Education allow extra payments but do not distinguish between principal-only and regular extra payments—any money beyond your scheduled payment goes to principal. Private student loan lenders vary widely.
Auto loans frequently restrict principal-only payments because the loan is secured by the car, and lenders want to may support the car's value stays above the remaining balance. Some auto lenders allow principal-only payments but require a minimum amount, such as $500 or $1,000. Personal loans are usually more flexible, though some charge a fee for principal-only payments or require you to make them through a specific channel.
Before making a principal-only payment, contact your lender directly and ask: Do you allow principal-only payments? Is there a minimum amount? Is there a fee? Do I need to make the payment through a specific method? Some lenders have this information on their website under "prepayment" or "extra payments." Others require a phone call. Getting this right prevents your extra money from being applied the wrong way.
When principal-only payments make sense financially
Principal-only payments are most valuable when your interest rate is high and you have extra money available. On a mortgage at 3 percent, the interest savings are modest. On a personal loan at 10 percent or higher, or on credit card debt at 18 percent or more, principal-only payments save significant money. The higher the rate, the more interest accrues each month, and the more you save by reducing the balance.
They also make sense if you're ahead on your budget and want to shorten your loan term without changing your regular payment. Instead of increasing your monthly payment (which can be hard to reverse if your situation changes), you make occasional principal-only payments when you have a bonus, tax refund, or unexpected income. This gives you flexibility.
Principal-only payments make less sense if you have high-interest debt elsewhere—credit cards, for example. Paying down a 4 percent mortgage principal-only while carrying a 20 percent credit card balance is usually the wrong priority. Pay off the credit card first, then use principal-only payments on the mortgage.
How to instruct your lender to explore a principal-only payment
The process depends on your lender. Some allow you to specify the payment type online: you log into your account, select "make a payment," choose "principal-only" from a dropdown, enter the amount, and submit. Others require a phone call. You call the customer service number, confirm your account, and tell the representative you want to make a principal-only payment of a specific amount. They process it over the phone or send you a form to sign and return.
A few lenders require written instruction. You send a letter or email stating your account number, the amount, and that it should be applied as a principal-only payment. Keep a copy and, if possible, get confirmation that they received and processed it correctly.
After you make the payment, check your account statement within a few days to confirm it was applied correctly. Your principal balance should decrease by the full amount you sent, and your next interest charge should reflect the lower balance. If it was applied as a regular payment instead, contact your lender when ready and ask them to correct it.
Principal-only payments and your loan term
Making principal-only payments shortens how long you'll be paying the loan. If you have a 30-year mortgage and make regular principal-only payments, you might pay it off in 25 years instead. The exact reduction depends on the size and frequency of the payments and your interest rate.
Some borrowers use principal-only payments strategically to hit a specific payoff date. For example, if you want to own your home free and clear by retirement in 15 years, you can calculate how much principal-only you need to pay annually to reach that goal. Your lender can help with this calculation, or you can use an online amortization calculator that lets you model different principal-only payment amounts.
One caution: if your loan has a prepayment penalty, making principal-only payments might trigger it. Prepayment penalties are rare on mortgages now but still exist on some loans. Check your loan documents for any mention of prepayment penalties before you start making principal-only payments.
Frequently Asked Questions
Does making a principal-only payment hurt my credit score?
No. Paying down principal does not hurt your credit. In fact, reducing your loan balance can slightly improve your credit over time because it lowers your overall debt. The only risk is if you miss a regular payment while saving for a principal-only payment—missed payments damage credit. Always make your regular payment on time, then make principal-only payments with money beyond that.
Can I make a principal-only payment on a credit card?
Most credit card companies do not offer principal-only payments in the traditional sense because credit cards do not have a fixed principal amount like a loan does. However, you can pay more than the minimum and request that the extra money not be used toward future purchases—this keeps it applied to your existing balance. Call your card issuer to confirm their policy.
What if my lender says they don't allow principal-only payments?
You can still pay extra on your regular payment, which will reduce your balance faster than scheduled, even if some of the extra goes to interest. The savings are smaller than with a true principal-only payment, but you still shorten your loan term and save money overall. Ask your lender if they allow you to specify that extra money should not be applied to future payments.
Do I need to tell my lender in advance that I'm making a principal-only payment?
No advance notice is required. You can make the payment and specify it as principal-only at the time of payment. However, if you plan to make large or frequent principal-only payments, calling your lender first to confirm their process and any restrictions saves time and prevents mistakes.
How often should I make principal-only payments?
There is no required frequency. Some people make one large principal-only payment per year with a tax refund. Others make small ones monthly. The more often you pay principal down, the more interest you save, but the benefit of timing matters more than frequency—a principal-only payment made early in your loan saves more than one made late, regardless of how often you make them.