Lower required monthly payment
30-yearA longer amortization spreads principal across more scheduled payments.
SwitchWize decision guide
15-year vs. 30-year mortgage: payment, equity and interest trade-offs
Compare affordability, equity and cost over the years you expect to keep the loan—not just lifetime interest.
What you can expect
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- No credit pull
- Assumptions shown
- Sources included
Quick answer
The 15-year term buys faster equity and usually lower lifetime interest; the 30-year term buys a lower contractual payment and more flexibility.
If 15-year
Best when the higher payment is comfortably affordable and faster payoff is the priority.
If 30-year
Best when payment resilience and optional extra principal matter more than forced speed.
Key number to watch
The 15-year path requires about $870.13 more per month under the entered rates.
Test your situation
See your result in dollars
Change any number below to match your situation. No login is required, and your entries stay in this browser.
$
Purchase price.
$
Cash applied to price.
%
Entered note rate.
%
Entered note rate.
years
Years before likely sale, payoff or refinance.
$
Affordability guardrail.
The 15-year payment is about $870.13 more per month. Over 10 years, the entered 30-year path has $59,220.55 more interest and entered closing costs, before valuing flexibility or investment results.
15-year fixed
$3,268
monthly principal + interest
$59,221 vs. baseline
30-year fixed
$2,398
monthly principal + interest
Try a scenario
Key number to watch
The 15-year path requires about $870.13 more per month under the entered rates.
How certain: high
Check these assumptions
- • Principal and interest are modeled; property taxes, insurance, mortgage insurance, points and association dues are excluded unless reflected in entered closing costs.
- • The investment scenario is hypothetical and can lose value; mortgage interest savings are not the same as a market return.
What matters most
Lower lifetime interest at entered rates
15-yearEntered lifetime principal-and-interest cost is $588,300.09 for the 15-year path and $863,352.76 for the 30-year path.
More equity after 10 years
15-yearThe modeled remaining balances are $171,106.54 and $334,742.9, respectively.
Budget flexibility
30-yearThe lower contractual payment leaves more room, but the benefit depends on what the borrower actually does with the difference.
Side-by-side comparison
Required payment
- 15-year
- Higher
- 30-year
- Lower
Payoff schedule
- 15-year
- 180 payments
- 30-year
- 360 payments
Equity pace
- 15-year
- Faster
- 30-year
- Slower without extra principal
Flexibility
- 15-year
- Lower minimum-payment flexibility
- 30-year
- Higher, if extra cash is used deliberately
What could go wrong
15-year fixed mortgage
- What needs to work
- The payment remains comfortable through income shocks.
- Common problem
- Housing payment crowds out reserves.
- What it could cost
- Forced borrowing or missed payments.
- How to prepare
- Refinancing depends on future approval and rates.
30-year fixed mortgage
- What needs to work
- Flexibility is used productively.
- Common problem
- The payment gap is spent without reducing debt or investing.
- What it could cost
- More lifetime interest.
- How to prepare
- Extra principal can accelerate payoff if terms allow.
A simple backup plan
Make flexibility explicit
A 30-year loan can mimic faster payoff, but only through actual extra principal.
- 1Choose a required payment resilient to income changes.
- 2Automate a sustainable extra-principal amount.
- 3Keep emergency reserves before accelerating the mortgage.
Educational illustration only. The right amount depends on your needs and timing.
What to do next
Question 1
Does the 15-year payment fit with reserves and other goals?
Yes: Compare horizon interest and equity.
No: Favor the 30-year or a lower price.
Question 2
Will you keep the loan near 15 years?
Yes: Lifetime interest matters more.
No: Focus on horizon balance and costs.
Question 3
Will you invest or prepay the gap consistently?
Yes: The 30-year flexibility has measurable value.
No: The forced 15-year schedule may help execution.
Plain-text decision tree. Does the 15-year payment fit with reserves and other goals? If yes, Compare horizon interest and equity. If no, Favor the 30-year or a lower price. Will you keep the loan near 15 years? If yes, Lifetime interest matters more. If no, Focus on horizon balance and costs. Will you invest or prepay the gap consistently? If yes, The 30-year flexibility has measurable value. If no, The forced 15-year schedule may help execution.
When to check again
- Rate quotes change.
- Home price or down payment changes.
- Income becomes less stable.
- Expected move date changes.
- Extra-payment behavior changes.
Methodology
Both paths use fixed-rate amortization. Horizon interest, remaining principal and lifetime interest are shown separately.
Rates and closing costs are editable scenarios; no live quote is implied.
- • Taxes, insurance, mortgage insurance and points are excluded.
- • Investment returns are hypothetical and volatile.
- • Tax deductions and refinancing are excluded.
Mortgage guidance is reviewed quarterly and after rule changes. Editorial conclusions do not depend on affiliate availability.
Sources
Frequently asked questions
Does a 15-year mortgage always have a lower rate?
Not always. Compare actual loan estimates.
Is principal a cost?
No. Principal reduction builds equity, so the model separates it from interest.
Can I pay a 30-year loan like a 15-year?
Extra principal can shorten payoff, subject to loan terms and consistent execution.
Should I invest the difference?
That depends on risk, taxes, fees and behavior; returns are not guaranteed.
What costs are excluded?
Taxes, insurance, mortgage insurance and unentered closing costs.
Which term is safer?
The safer term is the one whose required payment remains affordable under stress.