15-Year vs 30-Year Mortgage: Which One Costs Less and Which Fits Your Budget?

The term of a mortgage is one of the biggest choices you will make, and the two most common options are 15 and 30 years. A shorter term costs far less in interest but asks for a much higher monthly payment. A longer term is easier on the monthly budget but costs much more over time. This guide compares them with real numbers so you can see the trade-off clearly.

A worked example on a $300,000 loan

Lenders usually charge a lower rate on shorter terms. For illustration, assume 5.75% on the 15-year loan and 6.50% on the 30-year loan (actual rates depend on the market, your credit and the lender).

The 15-year loan costs about $595 more each month but saves roughly $234,000 in interest. Both payments exclude property tax, insurance and any mortgage insurance.

Why the gap is so large

Interest is charged on the remaining balance. With a 30-year loan, the balance falls slowly at first, so most early payments are interest. A 15-year loan sends a bigger share of each payment to principal from the start, which shrinks the balance faster and reduces the interest charged every month after that. Our guide to how mortgage payments are calculated shows the formula behind this.

Advantages of each term

The middle path: a 30-year loan with extra payments

If you want flexibility but also want to save interest, you can take a 30-year loan and voluntarily pay extra toward principal. Your required payment stays low, and in a tight month you can drop back to the minimum. Check that your loan has no prepayment penalty, and make sure extra money is applied to principal. Run the numbers with the Amortization Calculator to see how much an extra $200 a month shortens the term.

When a 15-year mortgage makes sense

• Your income is stable and the higher payment fits comfortably, leaving room for emergencies.
• You are building toward being debt-free before retirement.
• You are refinancing later in your career and want to avoid carrying a mortgage into retirement.

When a 30-year mortgage makes sense

• You want a lower required payment to keep your budget flexible.
• You would rather use spare cash for retirement accounts, an emergency fund or other goals.
• The rate gap between the two terms is small.

A common affordability test is that total housing costs should stay under about 28% of gross income, a rule explained in How Much House Can I Afford? The payment you can safely carry should drive the decision more than the lowest total interest.

Mortgage rate, APR and closing costs: read the whole offer

When you compare a 15-year fixed-rate mortgage with a 30-year fixed-rate mortgage, do not stop at the interest rate. The annual percentage rate (APR) folds in certain lender fees, so it gives a fuller picture of the cost of the home loan. Also compare closing costs, origination charges and any discount points. A discount point is an upfront fee, usually 1% of the loan amount, paid to lower the rate. Points can make sense if you will keep the loan for many years, but they add cash you need on closing day.

Down payment, PMI and loan-to-value

If your down payment is below 20% of the purchase price, a conventional lender typically requires private mortgage insurance (PMI), which is added to your monthly housing cost until your loan-to-value ratio falls low enough. Because a 15-year loan pays down principal faster, you reach the point where PMI can be removed sooner. Government-backed loans such as FHA loans use mortgage insurance premiums with their own rules. Use a mortgage calculator that includes taxes, insurance and PMI to see your true monthly payment, not just principal and interest.

Debt-to-income ratio and how much you can borrow

Lenders judge affordability with the debt-to-income (DTI) ratio: your total monthly debt payments divided by gross monthly income. A higher monthly payment on a 15-year mortgage raises your DTI, which can reduce the loan amount you qualify for or push you toward a cheaper home. If a 15-year payment would stretch you, the 30-year term may be the one that lets you buy the house you want while keeping a healthy safety margin.

What if you invested the monthly difference instead?

A popular argument for the 30-year mortgage is to take the lower payment and invest the difference. In our example the gap is about $595 a month. Invested for 15 years, that could grow to roughly $159,000 at a 5% annual return or about $189,000 at 7%, but returns are never guaranteed. Meanwhile, the 30-year borrower would still owe about $217,700 on the mortgage after 15 years, while the 15-year borrower owns the home outright. Paying down a mortgage earns a certain, risk-free "return" equal to your mortgage rate, while investing carries market risk. Many households split the difference: they pay a bit extra on the mortgage and also contribute to retirement accounts.

Other mortgage terms to consider

You are not limited to 15 and 30 years. Lenders also offer 10-year, 20-year and 25-year fixed-rate mortgages. A 20-year loan on the same $300,000 at 6.0% would cost about $2,149 a month with roughly $215,800 in total interest, a middle ground between the two. Adjustable-rate mortgages (ARMs) have a lower starting rate that can change later, which adds uncertainty.

Extra payments: how much faster can you finish?

Adding $200 a month to the 30-year loan above would shorten it to about 23 years and one month (roughly 277 payments) and cut total interest from about $382,600 to about $279,200 in this example. Always tell your servicer to apply extra money to principal, and confirm there is no prepayment penalty. Try your own numbers in the amortization calculator to see the full payment schedule.

Checklist before you choose a mortgage term

• Keep housing costs (mortgage, taxes, insurance, utilities, maintenance) within a share of income you can sustain.
• Hold an emergency fund of several months of expenses after closing.
• Compare offers from several lenders, including rate, APR, points and fees.
• Decide whether you value a guaranteed lower interest bill or monthly flexibility more.
• Think about how long you plan to stay in the home, since selling or refinancing changes the math.

Key terms in this guide: fixed-rate mortgage, amortization schedule, principal and interest, total interest, APR, discount points, PMI, loan-to-value, debt-to-income ratio, prepayment, refinance.

Frequently asked questions

Is a 15-year mortgage always better?
It costs less in total interest, but only if you can afford the higher payment without straining your budget or neglecting savings. A smaller payment you can keep up is better than a larger one that causes stress.

Can I switch from a 30-year to a 15-year later?
You can refinance into a shorter term, but refinancing has closing costs and depends on rates at the time. See how to weigh that in our guide to mortgage refinancing.

Do extra payments really save that much?
Yes. Because interest is calculated on the balance, every extra dollar applied to principal reduces the interest on all later months.

What is the best mortgage term for a first-time buyer?
There is no single best term. Many first-time buyers choose a 30-year fixed-rate loan for its lower payment, then make extra principal payments when they can. If your budget comfortably supports a 15-year payment, the shorter term saves a large amount of interest.

Does a 15-year mortgage have a lower interest rate?
Usually yes. Lenders often price shorter terms lower because they carry less long-term risk, but the gap varies with the market and your credit profile.

Is it better to pay off a mortgage early or invest?
It depends on your mortgage rate, your expected investment returns, your tolerance for risk and your tax situation. Paying down debt gives a guaranteed result, while investing offers higher potential returns with uncertainty.