An interest-only payment covers only the interest your lender charges, not the principal you borrowed
When you make an interest-only payment, your money goes toward the cost of borrowing — the interest — and nothing toward paying down the amount you originally borrowed, called the principal. If you borrow $200,000 at 5% interest per year, an interest-only payment that month covers only your share of that 5% charge. The $200,000 you owe stays exactly the same.
This is different from a standard payment, which splits your money between interest and principal. With a standard payment, part of what you pay reduces what you owe, and part covers the interest cost. With interest-only, none of it reduces what you owe.
Interest-only payments are most common with mortgages, home equity lines of credit, and some personal loans. They are rarely offered on car loans or credit cards. The structure is usually temporary — you pay interest-only for a set period (often 5 to 10 years), then switch to standard payments that include principal.
Key Takeaways
- Interest-only payments cover only the cost of borrowing, leaving the amount you owe unchanged.
- Your monthly payment is lower during the interest-only period than it would be with standard payments on the same loan.
- After the interest-only period ends, your payment jumps significantly because you then pay both interest and principal.
- Interest-only loans are most common with mortgages and home equity lines of credit, where the period usually lasts 5 to 10 years.
Why your monthly payment is lower with interest-only
Because you are not paying down the principal, your monthly payment is smaller than it would be on a standard loan for the same amount. A $300,000 mortgage at 6% interest costs about $1,800 per month with a standard 30-year payment structure. The same loan with interest-only payments costs roughly $1,500 per month during the interest-only period.
This lower payment can make borrowing feel more affordable in the short term. Some people use interest-only loans to keep their monthly costs down while their income is expected to rise, or while they are waiting to sell another property. Others use them to free up cash for other purposes.
The catch is that this lower payment is temporary. Once the interest-only period ends, your payment rises sharply because you now have to pay both interest and principal in whatever time remains on the loan. That same $300,000 mortgage, if you switch to standard payments after 5 years of interest-only, might jump to $2,200 or more per month for the remaining 25 years.
What happens to the amount you owe
During the interest-only period, the principal — the amount you borrowed — does not shrink. You owe $300,000 at the start, and you still owe $300,000 after 5 years of interest-only payments. You have paid thousands in interest, but none of that money reduced your debt.
This matters because it means you are not building equity in the asset you borrowed against (usually a home). If you have a $300,000 mortgage on a house worth $350,000, you have $50,000 in equity. After 5 years of interest-only payments, you still have only $50,000 in equity, even though you have paid tens of thousands in interest. With standard payments, you would have paid down some of the principal and built more equity.
It also means that if the value of your home drops, you could end up owing more than the house is worth — a situation called being underwater on your mortgage. This risk is higher with interest-only loans because you have not reduced what you owe.
The payment jump when interest-only ends
The biggest challenge with interest-only loans is the payment shock when the interest-only period ends. Your lender will recalculate your payment to cover both interest and principal over whatever time is left on the loan.
If you borrowed $300,000 at 6% with a 30-year term and paid interest-only for 5 years, you still owe the full $300,000. Your lender now has to fit that $300,000 into 25 years of payments instead of 30. Your new payment might be $2,200 or higher, compared to the $1,500 you were paying before. That is a jump of $700 per month or more.
Some borrowers plan for this jump and save money during the interest-only years to cover the higher payment. Others refinance — take out a new loan to replace the old one — to avoid the jump. A few find they cannot afford the new payment and end up in financial trouble.
Who offers interest-only loans and when
Interest-only mortgages are offered by banks, credit unions, and mortgage lenders, though they are less common now than they were before 2008. Most interest-only mortgages are offered to borrowers with strong credit and significant income, because lenders see them as higher risk.
Home equity lines of credit, sometimes called HELOCs, often come with an interest-only option. You can borrow against the equity in your home and choose to pay interest-only for the first 5 to 10 years, then switch to standard payments.
Some personal loans and business loans also offer interest-only periods, though this is less common. Credit cards and car loans almost never do — they require you to pay at least some principal with every payment.
How to know if interest-only makes sense for you
Interest-only loans work best for people who are certain their income will rise, who plan to sell the asset before the interest-only period ends, or who have a specific reason to keep their payment low for a few years. If you are buying a home to live in for 30 years, interest-only usually works against you because you spend more on interest overall and build equity more slowly.
Before taking an interest-only loan, calculate what your payment will be when the interest-only period ends. Make sure you can afford that higher payment, or have a plan to refinance or sell before it arrives. Ask your lender for the exact date the interest-only period ends and what your new payment will be — do not assume you will be able to refinance or that your income will rise as expected.
Compare the total interest you will pay over the life of an interest-only loan to the total interest on a standard loan for the same amount. The difference is often larger than you expect, because you are paying interest on the full principal for longer.
Interest-only loans versus standard payments
The main difference is what your payment covers. A standard payment splits your money between interest and principal from the first month. An interest-only payment covers only interest, leaving the principal unchanged.
Standard payments mean your monthly cost is higher, but you owe less each month and you pay less interest overall. Interest-only payments mean your monthly cost is lower now, but you owe the same amount and you pay more interest over time.
Standard payments build equity in your home or asset steadily. Interest-only payments do not build equity at all during the interest-only period. Once the interest-only period ends, your payment on an interest-only loan usually becomes higher than a standard payment would have been, because you have to pay down the full principal in less time.
Frequently Asked Questions
Can I pay principal during the interest-only period?
Yes. Most interest-only loans allow you to pay extra toward principal whenever you want, without penalty. Paying principal early reduces what you owe and lowers your interest cost over time. Some borrowers use interest-only loans this way — they make the minimum interest-only payment most months, then pay extra principal when they have the money.
What if I cannot afford the payment when interest-only ends?
You can refinance — take out a new loan to pay off the old one — if your credit and income still may have access to. You can also try to negotiate with your lender, though they are not required to work with you. If you cannot refinance and cannot afford the new payment, you risk falling behind on your loan, which damages your credit and can lead to foreclosure on a home loan.
Do interest-only loans have higher interest rates?
Sometimes. Because they are riskier for lenders, interest-only mortgages may carry a slightly higher rate than standard mortgages. The difference varies by lender and by market. Ask your lender to quote you both an interest-only rate and a standard rate so you can compare the total cost.
Is interest-only the same as a balloon payment?
No. Interest-only means you pay only interest for a set period, then switch to standard payments. A balloon loan means you make small payments for years, then owe a large lump sum at the end. They are different structures with different risks.
How much interest will I pay on an interest-only loan?
It depends on the interest rate, how long the interest-only period lasts, and how much principal you pay down during that time. Ask your lender to show you the total interest on an interest-only loan versus a standard loan for the same amount — the difference will show you what the interest-only structure costs you.