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15-Year vs 30-Year Mortgage — Side-by-Side Comparison With Real Numbers

Last updated: April 20267 min readCalculator Tools

A 15-year mortgage has higher monthly payments but saves $150,000-$265,000 in total interest. A 30-year mortgage has lower payments but costs significantly more over the life of the loan. Here are the exact numbers for common loan amounts so you can make the right choice for your budget.

Side-by-Side Comparison — $300,000 Loan

15-Year Mortgage30-Year MortgageDifference
Interest rate (typical 2026)6.50%7.00%0.50% lower on 15-year
Monthly payment (P&I)$2,613$1,996$617/month more on 15-year
Total payments over life$470,340$718,527$248,187 more on 30-year
Total interest paid$170,340$418,527$248,187 saved on 15-year
Mortgage-free in15 years30 years15 years sooner
Equity after 5 years~$134,000~$30,000$104,000 more equity on 15-year
Monthly income needed (28% rule)$9,332$7,129$2,203 more income needed

Comparison at Different Loan Amounts

Loan Amount15yr Payment30yr PaymentMonthly Diff15yr Total Interest30yr Total InterestInterest Saved
$200,000$1,742$1,331$411$113,560$279,018$165,458
$250,000$2,177$1,663$514$141,950$348,772$206,822
$300,000$2,613$1,996$617$170,340$418,527$248,187
$350,000$3,049$2,329$720$198,730$488,282$289,552
$400,000$3,484$2,661$823$227,120$558,036$330,916
$500,000$4,355$3,327$1,028$283,900$697,546$413,646

The Middle Ground: 30-Year With Extra Payments

Get a 30-year mortgage but pay as if it were a 15-year:

Decision Framework

Choose 15-Year IfChoose 30-Year If
Payment is under 25% of gross income15-year payment would exceed 28% of gross income
Already maxing 401k and IRA contributionsNeed lower payments to fund retirement contributions
You value being debt-free over investment returnsYou prefer investing the difference in the market
You have a stable income with low risk of reductionYour income is variable (commission, freelance, startup)
You have 6+ months emergency fund alreadyYou need to build emergency savings first
You do not plan to move in the next 10+ yearsYou might relocate within 5-7 years

Pair These Tools Together

Honest Limitations

This comparison uses fixed interest rates and does not account for tax implications (mortgage interest deduction), opportunity cost of the extra payment (investing the $617/month difference at 8% returns could outperform the 15-year interest savings), inflation (future dollars are worth less than today's dollars), or lifestyle changes (job loss, career change, relocation). The "right" choice depends on your complete financial picture, risk tolerance, and personal value of being debt-free.

Run the numbers for both terms right now — see the exact monthly payments and interest.

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