15 vs. 30-Year Mortgage: Which Is Right for You in 2026?

The choice between a 15-year and 30-year mortgage is one of the most consequential decisions in the homebuying process — and one that most borrowers make without fully running the numbers. The 30-year loan is cheaper every month. The 15-year loan is dramatically cheaper over time. Which one is actually better depends on your cash flow, your other financial priorities, how long you’ll keep the loan, and what you’d do with the monthly savings if you chose the longer term.

At current rates, the spread between a 30-year and 15-year conventional mortgage is 0.68 percentage points — 6.66% vs. 5.98% per Freddie Mac’s August 27, 2026 survey. That gap, applied to a $350,000 loan over the full term of each, produces a total interest difference of more than $280,000. Here’s how to think through which side of that tradeoff is right for your situation.

Table of Contents

• Current Rates: 15 vs. 30 Year
• Monthly Payment Comparison
• The Total Interest Difference
• Equity Buildup: How the Two Loans Compare
• The “Invest the Difference” Argument
• When the 30-Year Mortgage Makes More Sense
• When the 15-Year Mortgage Makes More Sense
• How to Decide: A Practical Framework
• Other Ways to Get 15-Year Benefits With a 30-Year Loan
• Frequently Asked Questions

Current Rates: 15 vs. 30 Year

As of August 27, 2026, Freddie Mac’s Primary Mortgage Market Survey shows:

The spread between the two terms has actually narrowed compared to a year ago — the 15-year rate has risen slightly faster than the 30-year. Historically, this spread has averaged around 0.50–0.75 percentage points. The current 0.68-point spread is within the normal range, which means neither term is unusually advantaged or disadvantaged relative to historical norms.

These PMMS rates assume 20% down and excellent credit. Your actual rate will vary based on your credit score, down payment, and lender. Compare live quotes from multiple lenders at our mortgage rate comparison page.

Monthly Payment Comparison

The most immediate impact of the term choice is your monthly payment. Here’s the side-by-side at current rates across common loan amounts:

These are principal and interest only — property taxes, homeowners insurance, and PMI (if applicable) are additional and the same regardless of loan term. Use our mortgage calculator to model your specific scenario including taxes and insurance.

The monthly difference is real money. On a $350,000 loan, $692/month is $8,304/year. Over the 15-year life of the shorter loan, that’s $124,560 in additional payments. Whether that tradeoff is worth it depends on what you’d do with the $692 if you chose the 30-year loan — which the total interest and investment sections below address directly.

The Total Interest Difference

This is where the 15-year loan’s advantage becomes undeniable. The difference in total interest paid over the full terms is substantial — not because of some financial sleight of hand, but because of the compounding effect of paying interest for 30 years instead of 15, and at a higher rate.

The 15-year borrower pays $281,160 less in total interest on a $350,000 loan. That number is the core financial case for the shorter term. It’s not a projected investment return or a hoped-for outcome — it’s a guaranteed result of paying less interest at a lower rate over half as many years.

At the low interest rates of 2020–2021 (3%–3.5%), this argument was less powerful because borrowing was so cheap that investing the difference was almost certainly the better mathematical move. At 6.66%, the guaranteed savings from the 15-year loan deserve much more serious weight.

Equity Buildup: How the Two Loans Compare

Beyond the total interest difference, the 15-year loan builds equity dramatically faster. This matters if you plan to sell before the loan is paid off, want to tap home equity through a HELOC or home equity loan, or want to reach 20% equity quickly to eliminate PMI.

Here’s how the remaining loan balance compares on a $350,000 mortgage at current rates:

At year 10, a 15-year borrower has paid off $162,374 in principal while a 30-year borrower has paid off only $47,950. The 15-year borrower has nearly $115,000 more in equity — equity that could be accessed through a HELOC or home equity loan for renovations, investments, or other needs.

The “Invest the Difference” Argument

The most common case made for the 30-year loan goes like this: take the monthly savings (say, $692) and invest it in the stock market. Over 30 years at an average return of 7–10%, that invested amount grows to far more than the $281,160 in extra interest you paid on the 30-year loan.

The math, in theory, works — over very long time horizons with consistent investing. But it rests on several assumptions that deserve scrutiny:

• Most people don’t actually invest the difference. Research consistently shows that the saved monthly payment from a 30-year loan tends to get absorbed into lifestyle spending rather than disciplined investing. The 15-year loan forces equity building whether you’re financially disciplined or not.
• The guaranteed return vs. expected return trade-off. Paying off a 6.66% mortgage is a guaranteed, risk-free 6.66% return. Investing in the stock market is an expected return of 7–10% with meaningful volatility — some years losing 20–30%. The higher your mortgage rate, the more compelling the guaranteed return becomes relative to the uncertain market return.
• Tax considerations shift the math. If you itemize and deduct mortgage interest, the effective cost of your 30-year loan is lower than the stated rate. But with the higher 2026 standard deduction ($32,200 for married filing jointly), fewer homeowners itemize than in prior generations — reducing this advantage.
• The argument works better at lower rates. At 3%–4% mortgage rates, the expected market return of 7%+ clearly exceeds the guaranteed benefit of early payoff. At 6.66%, the gap between the guaranteed savings and expected investment return is much narrower — and significantly less certain.

The honest answer: the invest-the-difference approach can work mathematically if you’re genuinely disciplined, genuinely invest consistently, and genuinely maintain that discipline through market downturns. For most households, the 15-year loan’s forced equity building is a more reliable path to long-term wealth even if it’s theoretically suboptimal on a spreadsheet. See our taxable brokerage account guide if you’re serious about the invest-the-difference strategy — it covers how to structure the investing side of that decision.

When the 30-Year Mortgage Makes More Sense

• The higher payment would genuinely strain your budget. If the 15-year payment leaves you with insufficient cash for emergencies, retirement contributions, or basic financial cushion, the 30-year is the responsible choice. A 15-year loan that causes you to skip retirement contributions or carry high-interest credit card debt is not a financially superior outcome — even though the mortgage math says it is.
• Your income is variable or uncertain. Self-employed borrowers, commission earners, seasonal workers, and anyone in a field with volatile income benefit from the lower required payment. You can always make extra principal payments on a 30-year loan in good months — the flexibility cuts both ways.
• You have other high-priority financial goals competing for the same dollars. If you haven’t maxed your 401(k) match, have high-interest debt, or have children approaching college age, the $692/month difference may produce better financial outcomes in those places than in a 15-year mortgage payment.
• You plan to sell within 7–10 years. If you’re unlikely to hold the loan to term, the total interest savings of the 15-year loan are less relevant. What matters is the interest paid during your actual ownership period — and the difference between the two terms in the first 7–10 years is smaller than the lifetime comparison suggests.
• You’re buying near the top of your qualification range. If the 30-year payment already takes you to the edge of your approved DTI, a 15-year payment will push you over. Work with what you qualify for — you can refinance later if your income grows.

When the 15-Year Mortgage Makes More Sense

• You can genuinely afford the higher payment without financial stress. The 15-year loan is best suited to buyers whose budget can accommodate the higher payment while still maintaining an emergency fund, contributing to retirement, and handling normal life expenses. If the payment works within those constraints, the financial case is strong.
• You’re refinancing an existing 30-year loan. If you have 20 years remaining on a 30-year mortgage and refinance into a 15-year, you shorten your payoff by 5 years and likely lower your rate at the same time. Many refinancers use this moment to accelerate their path to mortgage-free living.
• You’re in or approaching your peak earning years. In your 40s or 50s with strong, stable income and grown children, the 15-year loan’s discipline is a highly effective path to entering retirement mortgage-free — one of the most significant improvements to retirement security a homeowner can achieve.
• You want to be mortgage-free by retirement. If you’re 50 and take a 15-year mortgage, you’re paid off at 65. If you take a 30-year mortgage, you’re still paying at 80. For buyers in mid-career, the 15-year loan aligns homeownership payoff with the retirement timeline in a way the 30-year rarely does.
• You’re not a disciplined investor. If you know from experience that you wouldn’t consistently invest the monthly difference from a 30-year loan, the forced savings of a 15-year loan is genuinely more valuable than the theoretical invest-the-difference outcome.

How to Decide: A Practical Framework

Run through these questions in order:

1. Can you comfortably afford the 15-year payment?
Calculate the 15-year monthly payment on your target loan amount. Subtract it from your take-home pay. If what remains covers your essential expenses, emergency fund contributions, retirement contributions, and leaves reasonable discretionary room — the 15-year is worth serious consideration. If it’s a stretch, stop here and take the 30-year.

2. Have you captured your 401(k) match and built a full emergency fund?
If not, the 30-year loan frees up cash flow that produces better financial outcomes in those places first. A 6.66% guaranteed return on extra mortgage principal is attractive, but it’s not better than a 50–100% employer match on 401(k) contributions.

3. Where are you in your career and life stage?
Early-career buyers with growing incomes and long investment horizons often benefit more from the 30-year’s flexibility. Mid-career buyers with stable income and a retirement countdown often benefit more from the 15-year’s forced payoff timeline.

4. Would you actually invest the monthly difference?
Be honest with yourself. If the answer is no — or even “probably not consistently” — the 15-year’s guaranteed equity building is more valuable than the theoretical invest-the-difference math.

5. How long will you keep the loan?
If you’re confident you’ll sell within seven years, the lifetime interest comparison matters less. Focus on the rate difference (0.68 points currently) and whether the lower 15-year rate is worth the higher payment for that shorter holding period.

Get preapproved for both terms to see the exact payment and rate you qualify for — preapproval gives you real numbers, not estimates. Our mortgage preapproval guide walks through the process and what to bring. If you haven’t chosen a lender yet, compare current rates for both terms at our rate comparison page.

Other Ways to Get 15-Year Benefits With a 30-Year Loan

You don’t have to choose rigidly between the two standard terms. A 30-year loan with deliberate extra principal payments can mimic many of the 15-year loan’s benefits while preserving cash flow flexibility:

Make extra principal payments

Most 30-year mortgages have no prepayment penalty. Adding $300–$500/month to your principal payment shortens your loan term and reduces total interest significantly — without the obligation of a higher required payment in tight months. The downside: it requires consistent discipline. The upside: it offers the flexibility the 15-year doesn’t.

Switch to biweekly payments

Instead of making 12 monthly payments, you make 26 half-payments — the equivalent of 13 monthly payments per year. That one extra payment per year reduces a 30-year mortgage to roughly 25–26 years and saves tens of thousands in interest. Many servicers offer biweekly payment programs; others allow you to simply split your payment and pay twice monthly.

Refinance into a 15-year later

Take the 30-year now for the cash flow flexibility. Once your income grows, your financial cushion improves, or rates change, refinance into a 15-year. This strategy works well for early-career buyers who expect income growth. The risk: refinancing costs money (closing costs of 2–3% of the loan amount) and requires re-qualifying — so don’t count on it as a certainty. See how refinancing works in our rate-and-term refinance guide.

Frequently Asked Questions