A 30-year mortgage makes sense if you need the lower monthly payment to stay financially flexible. A 15-year mortgage makes sense if you can handle a substantially higher monthly payment and want to cut your total interest bill significantly. That’s the whole decision in one sentence.
The rate difference alone matters: lenders typically price 15-year fixed rates about half a percentage point lower than 30-year rates. Combined with the shorter payoff window, that gap means total interest on a 15-year loan can be significantly less than on a comparable 30-year note. The monthly payment is the price you pay for that savings.
Key Takeaways
A 15-year mortgage saves roughly $289,000 in interest on a $350,000 loan compared to a 30-year, but costs about $722 more per month.
| Point | Details |
|---|---|
| Core decision rule | Choose 15-year if the higher payment fits your budget; choose 30-year if you need flexibility. |
| Monthly payment gap | On a $350,000 loan, the 15-year runs about $722/month more than the 30-year in this example. |
| Total interest difference | The 30-year generates roughly $289,000 more in total interest than the 15-year in this example. |
| DTI and qualification | The higher 15-year payment raises your DTI and can reduce the loan amount you qualify for. |
| Middle-ground strategy | A 30-year loan with consistent extra principal payments captures most 15-year benefits with less risk. |
This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.
Table of Contents
- How does a 15 vs. 30 year mortgage compare in real dollars?
- Which borrower does each term actually fit?
- How do you decide which mortgage term is right for you?
- How does your term choice affect what you can borrow?
- Can extra payments or refinancing give you the best of both terms?
- Tax and other financial considerations
- Which calculators should you use, and how?
- An editorial perspective on the real choice most buyers face
- Sources
- FAQ
How does a 15 vs. 30 year mortgage compare in real dollars?
The numbers below use an example loan with no taxes, insurance, or origination fees included. Rates are illustrative, based on the typical spread lenders charge.
Assumptions: $350,000 loan amount, fixed rate, principal and interest only, no PMI, no escrow.
| Metric | 15-Year (—) | 30-Year (—) |
|---|---|---|
| Monthly P&I payment | Higher for 15-year | Lower for 30-year |
| Monthly difference | Significantly higher for 15-year | Baseline |
| Total interest paid | Much lower for 15-year | Much higher for 30-year |
| Total cost (P+I) | Much lower for 15-year | Much higher for 30-year |
| Equity at year 5 | Higher equity buildup for 15-year | Lower equity buildup for 30-year |
| Equity at year 10 | Higher equity buildup for 15-year | Lower equity buildup for 30-year |
| DTI impact | Higher (harder to qualify) | Lower (easier to qualify) |
The monthly payment gap is significant, as is the additional interest the 30-year borrower pays over the life of the loan. Rocket Mortgage frames this clearly: the 30-year lowers your monthly obligation and expands buying power, while the 15-year shortens the payoff and cuts lifetime interest.
Where your payments go in the early years
By year 5, you’ve paid down only about $18,000 of the $350,000 principal. That’s the equity build-up gap the table above reflects.
Pro Tip: Run your own numbers at HUD’s housing tools or a side-by-side mortgage calculator. Keep the loan amount identical in both scenarios and change only the rate and term. The equity column at year 5 and year 10 is often the most persuasive output.
Which borrower does each term actually fit?
SoFi’s analysis puts it plainly: 15-year loans save substantially on interest but demand higher payments that only some borrowers can sustain. Here’s how that plays out across common buyer profiles.
15-year mortgage works well for:
- Dual-income households with stable jobs and a low debt load, where the higher payment doesn’t strain the budget
- Buyers within 15–20 years of retirement who want the mortgage gone before income drops
- Homeowners refinancing from a 30-year who have already built equity and want to accelerate payoff
- Buyers purchasing below their maximum approval amount, leaving room for the higher payment
30-year mortgage works well for:
- Single-income families or buyers with variable income who need payment flexibility
- First-time buyers stretching to afford a home in a competitive market
- Investors who plan to rent the property, where cash flow per month matters more than payoff speed
- Borrowers carrying student loans, car payments, or other debt that already strains their DTI
The 30-year isn’t the “worse” choice. For a buyer who invests the $722 monthly difference in a diversified portfolio, the math can actually favor the 30-year over a long horizon. The honest answer is that most people don’t invest the difference consistently, which is why the 15-year tends to produce better real-world outcomes for the average homeowner.
How do you decide which mortgage term is right for you?
Work through these questions before you call a lender.
1. Can you afford the higher payment without stress? Take the 15-year payment from your scenario and subtract it from your monthly take-home. If what’s left covers your bills, emergency fund contributions, and at least a small buffer, the 15-year is viable. If it’s tight, the 30-year buys you breathing room.
2. Do you have three to six months of expenses saved? A 15-year locks you into a higher required payment. If your emergency fund is thin, one job loss or medical bill could force a refinance or default. Build the cushion first.
3. Do you carry high-interest debt? Pay those off before committing to the higher mortgage payment.
4. How long do you plan to stay in the home? If you’re likely to sell in five to seven years, the total-interest savings of a 15-year shrink considerably. The 30-year’s lower payment may serve you better for a shorter horizon.
5. Is your income stable and likely to grow? Salaried employees with predictable raises can absorb the 15-year payment more safely than freelancers or commission-based earners.
Pro Tip: You don’t have to choose between the two extremes. Take the 30-year loan, then make voluntary extra principal payments each month equal to the difference. You get the lower required payment as a safety net, and you accelerate payoff when cash flow allows. Rocket Mortgage notes this approach captures most of the equity and interest benefits of a 15-year while preserving flexibility.
How does your term choice affect what you can borrow?
This is where the 15-year’s higher payment creates a concrete problem for some buyers. Lenders calculate your debt-to-income ratio using the required monthly payment, not what you choose to pay. Chase explains that the higher 15-year payment raises your DTI, which can reduce the loan amount you qualify for.
Key lender considerations by term:
- Credit score: Both terms generally require a minimum 620 for conventional loans, but better rates on either term come at 740+
- DTI ceiling: Conventional loans typically allow up to 43–45% total DTI; FHA loans may go higher with compensating factors
- Reserves: Some lenders require two to six months of reserves for a 15-year loan, since the higher payment represents more payment risk
- Loan size: A buyer approved for $400,000 on a 30-year may only qualify for $320,000–$330,000 on a 15-year at the same income
If you’re shopping in Metro Detroit, where median home prices vary significantly across Wayne, Oakland, and Macomb counties, this qualification gap matters. Comparespot’s rankings of Metro Detroit mortgage lenders can help you find lenders who work with both term structures and can show you the approval difference for your income.
Can extra payments or refinancing give you the best of both terms?
Yes, and this is one of the most underused strategies in mortgage planning.
-
Extra principal payments on a 30-year. Adding $500/month in extra principal to the $350,000 30-year example above cuts roughly seven to eight years off the payoff and saves tens of thousands in interest, depending on current rates. You keep the lower required payment as a floor.
-
Biweekly payments. Splitting your monthly payment in half and paying every two weeks results in 26 half-payments per year, which equals 13 full payments instead of 12. That one extra payment per year shaves roughly four to five years off a 30-year loan with no other changes.
-
Refinancing into a 15-year. When rates drop or your income rises, refinancing from a 30-year into a 15-year can lock in savings. The key calculation is break-even: divide total closing costs by the monthly savings from the lower rate. If closing costs are $6,000 and you save $300/month, break-even is 20 months. If you plan to stay longer than that, the refinance makes financial sense.
-
Mortgage recasting. After a lump-sum principal payment (say, from a bonus or inheritance), some lenders will recast the loan, recalculating your required monthly payment on the lower balance without a full refinance. Fees are typically low, $150–$300, and it reduces your required payment while keeping the original term.
Pro Tip: Before refinancing, get a written loan estimate and calculate break-even time. If you’re within five years of payoff, closing costs rarely justify a new loan. Also consider whether you’d be resetting the interest-heavy early years of amortization.
Tax and other financial considerations
The mortgage interest deduction allows homeowners to deduct interest paid on loans up to $750,000 (for loans originated after December 15, 2017) if they itemize deductions. A 30-year borrower pays more interest, especially in early years, which can mean a larger deduction. A 15-year borrower pays less interest and may find the standard deduction exceeds their itemized total sooner.
Other costs that shift with term choice include considerations like Mortgage Protection Insurance vs Life Insurance: Which Wins?, important for borrowers concerned about maintaining payments under either mortgage term.
- PMI timeline: If your down payment is under 20%, PMI cancels when equity reaches 20%. The 15-year builds equity faster, so PMI drops off sooner, saving on that monthly cost.
- Opportunity cost: The $722/month difference could go into a retirement account or index fund. Over 15 years, that amount invested at a reasonable return could grow substantially, though this requires consistent discipline.
- Insurance and property taxes: These don’t change with your mortgage term, but they’re part of your total housing payment and affect DTI regardless of which term you choose.
This is general information, not tax or legal advice. Consult a tax professional to understand how the mortgage interest deduction applies to your specific situation.
For buyers also weighing loan type alongside term, Comparespot’s guide on FHA vs. conventional mortgages covers how product choice interacts with qualification and down payment requirements.
Which calculators should you use, and how?
Run two scenarios side by side. Keep everything identical except the rate and term.
- Hud: Federal consumer housing tools and guidance; good for understanding amortization basics and consumer protections
- MortgageCalculatorPlus: Dedicated 15 vs. 30 calculator with side-by-side output for monthly payment, total interest, and total cost
- Allstate’s mortgage calculator: Straightforward tool for running identical scenarios and comparing equity at 5 and 10 years
- Schwab MoneyWise calculator: Clean interface for comparing the two terms with adjustable rates
- Bank and credit union calculators: Texas Bay Credit Union’s educational page is one example of a clear, consumer-friendly explanation paired with a calculator
What to double-check in any calculator:
- Use the actual rate you’ve been quoted, not a national average
- Exclude taxes and insurance from the P&I comparison so the term difference is isolated
- Enter origination fees and PMI if you want total cost of ownership
- Check the equity output at year 5 and year 10, not just the final payoff
An editorial perspective on the real choice most buyers face
The 15-year vs. 30-year debate gets framed as a math problem, but it’s really a behavior problem. The 15-year forces the savings. The 30-year requires discipline to capture the same result through extra payments, and most borrowers don’t maintain that discipline consistently over decades.
That said, the 30-year with a voluntary extra-payment strategy is genuinely the right answer for buyers who are close to their qualification ceiling, who have variable income, or who are carrying other high-interest debt. Locking into a higher required payment when your financial situation is already stretched is a real risk, not just a theoretical one.
For Metro Detroit buyers specifically: home prices in Oakland County have risen steadily, and the qualification gap between a 15-year and 30-year payment can mean the difference between buying in Birmingham and buying in a neighboring suburb. Comparespot’s Metro Detroit mortgage broker rankings are worth checking before you commit to a term, because a good broker can sometimes find 15-year pricing that narrows the monthly gap more than you’d expect.
If you’re ready to find a lender in Metro Detroit who can quote both terms and show you the real numbers for your income and purchase price, Comparespot ranks the top local mortgage lenders and brokers based on independent research and customer sentiment, not paid placement.
Sources
- 15-Year vs. 30-Year Mortgage | Chase
- 15-year vs. 30-year mortgage | Rocket Mortgage
- 15-Year vs. 30-Year Mortgage: Which One Should You Get? | SoFi
- 15 vs 30 Year Mortgage Calculator - Compare Payments and Interest
- Hud
FAQ
Is a 15-year mortgage always cheaper overall?
Yes, in total interest paid. The lower rate and shorter term together mean you pay significantly less interest over the life of the loan, though the monthly payment is substantially higher.
Can I switch from a 30-year to a 15-year mortgage later?
You can refinance into a 15-year at any point, but you’ll pay closing costs and restart the amortization clock. Calculate break-even time (closing costs divided by monthly savings) to confirm it makes financial sense before proceeding.
How much higher is the monthly payment on a 15-year loan?
On a $350,000 loan at typical rates, the 15-year payment runs about $722 more per month than the 30-year. The exact gap depends on the rate spread your lender quotes.
Does a 30-year mortgage hurt you financially?
Not necessarily. A 30-year with disciplined extra payments can produce similar equity and payoff results to a 15-year while keeping your required payment lower for months when cash flow is tight.
Which mortgage term is better for first-time buyers?
Most first-time buyers benefit from the 30-year’s lower required payment, which preserves cash flow for repairs, emergencies, and other debts. A 15-year is worth considering only if the higher payment leaves a comfortable monthly buffer.