15-Year vs 30-Year Mortgage: Payment and Interest Compared

How do the payments and totals compare?

The table uses the Mortgage Calculator with a 400,000 price, 20% down and no taxes, insurance or fees, so it shows principal and interest only. The calculator also returns a built-in comparison of terms for the same loan and rate, which is where the 15- and 30-year rows at 6.5% come from.

The 15-year loan repays the same 320,000 in half the time. Its payment is about 38% higher, but interest falls by more than half, because the balance shrinks faster and interest is charged on a smaller amount each month.

Why does a 15-year loan cost so much less interest?

Each month, interest is charged on the remaining balance. With a 30-year loan, the balance falls slowly in the early years, so most of each payment is interest. With a 15-year loan, the bigger payment cuts the principal faster, so there is less balance left to charge interest on.

In the 30-year example, the borrower pays about 276,260 in interest during the first 15 years alone and still owes about 232,189 at that point. The 15-year borrower owes nothing after 15 years.

Do 15-year mortgages have lower rates?

Often. The Federal Reserve's guide says shorter-term mortgages generally have lower interest rates, and its own example compares a 30-year loan at 6.0% with a 15-year loan at 5.5%. Actual rates depend on the lender, the market and your credit, so use quotes rather than assumptions.

A lower rate adds to the savings. In our example, dropping the 15-year rate from 6.5% to 5.75% lowers the payment by 130.23 a month and the total interest by 23,441.63.

Which term can I afford?

The monthly payment is what most budgets feel. In the example, the 15-year loan needs 764.92 more each month at the same rate. Add property tax, insurance, HOA dues and any PMI, which the Mortgage Calculator lets you enter, to see the full monthly cost for each term.

Lenders also look at your debt-to-income ratio. A higher payment on a shorter term can limit how large a loan you qualify for, which is one reason many buyers choose 30 years even when they could pay faster.

Can I get 15-year results with a 30-year loan?

Largely, yes, if you pay extra and the loan has no prepayment penalty. In the Mortgage Calculator, adding 764.92 a month to the 30-year loan at 6.5%, the difference between the two payments, pays it off in 181 months instead of 360 and saves 226,383.78 in interest, almost exactly the 15-year result.

The difference is flexibility. With a 30-year loan you can drop back to the required 2,022.62 in a tight month. The cost is that 30-year loans often have a higher rate than 15-year loans, so paying extra on one usually costs a little more than taking the shorter term at its lower rate.

Are there terms between 15 and 30 years?

Yes. Many lenders offer 20- and 25-year terms, and the calculator accepts any whole term from 1 to 50 years. A middle term gives a payment between the two and saves part of the interest.

Try several terms with the same price, down payment and rate. The calculator's comparison shows how payment and interest move together, so you can find the shortest term your budget handles comfortably.

When does a 30-year term make more sense?

If the lower payment leaves room for an emergency fund, retirement saving or paying off higher-rate debt, a 30-year term can be the better choice even though it costs more interest. Paying a 24% credit card first saves more than prepaying a 6.5% mortgage, as the Debt Payoff Calculator shows.

A 15-year term suits borrowers with steady income who want to own their home sooner and pay the least interest. There is no single right answer; the calculator shows the cost of each option.

How fast does each term build equity?

Equity is the part of the home you own outright: its value minus the loan balance. Because the 15-year payment puts more toward principal from the first month, equity grows much faster. After 15 years the 15-year borrower owns the home free of the loan, while the 30-year borrower in the example still owes about 232,189, ignoring any change in the home's value.

Faster equity can matter if you plan to move, refinance or borrow against the home later. It also lowers risk: if prices fall, a borrower with more equity is less likely to owe more than the home is worth.

Can I switch terms later by refinancing?

Yes, refinancing replaces your loan with a new one, which can have a different term. The Federal Reserve's guide notes that moving to a shorter term generally brings a lower rate and lower total interest, while moving to a longer term lowers the monthly payment but raises total interest.

Refinancing has closing costs, so compare those fees with the interest you would save. Running both the old and new loans in the Mortgage Calculator shows the payment and interest difference before you talk to a lender.

How should I compare quotes for each term?

Ask lenders for both a 15-year and a 30-year quote on the same day, with the same down payment and points, so the rates are comparable. Then enter each rate in the calculator for its own term rather than using one rate for both.

Look at total cost as well as the payment. A quote with a slightly lower rate but high fees may cost more over the years you expect to keep the loan.

How do I compare mortgage terms step by step?

1. Enter the price and down payment. For example 400,000 and 20%.
2. Enter the rate. Use the quoted rate for each term, such as 6.5% for 30 years.
3. Set the term. Run 30 years, then 15 years, or read the built-in comparison.
4. Add other costs. Include tax, insurance, HOA and PMI for the full monthly payment.
5. Test extra payments. Add an extra monthly amount to the 30-year loan to see how early it pays off.
6. Decide. Choose the term whose payment fits your budget with room to spare.

Example

What should I keep in mind?

FAQ

Is a 15-year mortgage better than a 30-year?

It costs far less interest but has a higher payment; which is better depends on your budget.

How much more is a 15-year payment?

In the example at 6.5% on 320,000, 764.92 more a month.

How much interest does a 15-year loan save?

226,384.52 in the 6.5% example, compared with 30 years.

Do 15-year loans have lower rates?

Often. The Federal Reserve's guide says shorter terms generally have lower rates.

Can I pay off a 30-year mortgage in 15 years?

Yes, by paying extra each month if there is no prepayment penalty.

Why is most of an early payment interest?

Interest is charged on the balance, which is largest at the start.

Does the calculator include taxes and insurance?

You can enter property tax, insurance, HOA and PMI to add them.

What about 20-year terms?

You can enter any whole term from 1 to 50 years to compare it.

How much is owed after 15 years on a 30-year loan?

About 232,189 in the 6.5% example.

Should I prepay my mortgage or other debt?

Higher-rate debt usually saves more when paid first.

How should I compare 15-year and 30-year payments side by side?

Enter the same loan amount and rate assumptions for each term, then compare payment, interest, and payoff date.

Why is the 15-year payment higher even at a lower rate?

You repay principal over fewer years, so each month must cover more principal.

What cash-flow flexibility does a 30-year term add?

Lower required payments free budget for emergencies, though total interest is usually higher if you only pay the minimum.

Can extra payments on a 30-year loan mimic a 15-year payoff?

Yes—consistent principal prepayments can shorten the schedule; confirm there is no prepayment penalty.

How do rates typically differ between the two terms?

15-year quotes are often lower than 30-year quotes from the same lender, but always compare live offers.

What equity builds faster on a 15-year loan?

More of each early payment goes to principal, so equity usually grows quicker than on a 30-year schedule.

Should taxes and insurance change which term I pick?

They affect the full housing payment either way; compare principal-and-interest first, then add escrow estimates.

How do I stress-test a 15-year payment?

Ask whether the higher payment still works if income drops; if not, a 30-year with voluntary extras may fit better.

What role does expected time in the home play?

Short stays may favor lower payments; long stays increase the value of interest savings from a shorter term.

Is refinancing from 30-year to 15-year common?

Yes when rates and budget allow; run new payment numbers before closing costs lock you in.

Sources and further reading

• A Consumer's Guide to Mortgage Refinancings (Federal Reserve)