Does a shorter mortgage term mean a lower interest rate?

Yes, typically. Shorter terms carry less risk for lenders, so rates are lower. The 15-year mortgage rate is usually 0.5-0.75% lower than the 30-year rate. This calculator uses the same rate for all terms to isolate the term effect, but in practice you should get quotes for each term separately.

Are there lenders who offer a 25-year mortgage term?

Yes, though they are less common in the US than in Canada and the UK, where 25 years is the standard term. Some US lenders offer 25-year terms. You can also achieve a 25-year equivalent by taking a 30-year mortgage and making extra payments systematically.

Interest Savings by Term Calculator

Compare all mortgage terms in one view. Enter your loan amount and rate to instantly see monthly payments and total interest for 10, 15, 20, 25, 30, and 40 year terms. Find the sweet spot, see how much you save vs the 30-year baseline, and check your wealth position at year 30.

Loan Amount

Interest Rate

Full Term Comparison Matrix

Monthly payment and total interest for every major term

Term	Monthly Payment	Total Interest	Total Paid
10 yr	$4,019	$132,261	$482,261
15 yr	$3,097	$207,493	$557,493
20 yrSweet Spot	$2,661	$288,706	$638,706
25 yr	$2,418	$375,457	$725,457
30 yrBaseline	$2,270	$467,234	$817,234
40 yr	$2,112	$663,639	$1,013,639

30yr vs 15yr Savings

$259,741

Pay $827 more/mo for 15yr

Sweet Spot (20yr) Savings

$178,528

Only $391 more/mo than 30yr

Worst: 40yr Extra Interest

$196,406

vs 30yr baseline

Advanced

Payment Difference & Sweet Spot Analysis

Extra monthly cost per term vs 30yr, interest saved per dollar spent, optimal term highlight

How much MORE you pay per month for each shorter term vs the 30-year baseline. These are the exact dollars your budget must accommodate.

Term	Monthly Payment	Extra vs 30yr	Extra Per Year
10 yr	$4,019	+$1,749	+$20,985
15 yr	$3,097	+$827	+$9,925
20 yr ★	$2,661	+$391	+$4,694
25 yr	$2,418	+$148	+$1,777
30 yr	$2,270	Baseline	—
40 yr	$2,112	-$158	-$1,900

The 20-year term is the sweet spot: it typically costs only $391/mo more than the 30-year but saves $178,528 in interest. The 15-year maximizes savings but requires a larger payment jump.

Pro

Wealth at Year 30, Tax Impact & Income Qualification

Net wealth position, deduction loss by term, minimum income at 28% DTI

For each term, calculate your net wealth position at year 30: total paid + the investment value of your monthly payment savings vs the 30-year baseline payment.

Investment Return

Term	Total Paid	Invested Savings at Yr 30	Net Position
10 yr	$482,261	$1,182,552	$1,664,813
15 yr	$557,493	$719,534	$1,277,027
20 yr	$638,706	$392,919	$1,031,624
25 yr	$725,457	$162,523	$887,980
30 yr	$817,234	$0	$817,234
40 yr	$1,013,639	$0	$1,013,639

Shorter terms free up your mortgage payment sooner, which you can invest. The "invested savings" column shows what investing the freed payment grows to — dramatically improving your net position by year 30.

How to Use This Interest Savings by Term Calculator

Enter your loan amount and interest rate. The calculator instantly shows a complete matrix of monthly payments and total interest for every major mortgage term: 10, 15, 20, 25, 30, and 40 years. No need to run multiple calculators — see everything in one view.

Quick Tab

The full matrix highlights the 20-year term as the "sweet spot" and the 30-year as the baseline. Look at the total interest column — the difference between a 30-year and a 15-year is often $150,000 or more on a $350,000 loan. The 40-year option is shown for comparison but almost never makes financial sense.

Advanced: Payment Difference & Sweet Spot

The "Payment Difference" tab shows exactly how much more per month you pay for each shorter term versus the 30-year baseline. The "Sweet Spot" tab calculates which term gives the best return on each extra dollar paid — typically the 20-year term wins this analysis by delivering massive interest savings for a relatively modest payment increase.

Pro: Wealth, Tax & Income Qualification

The wealth analysis shows your net financial position at year 30 for each term, accounting for the investment value of freed-up payments after shorter-term loans are paid off. The income qualification tab shows which terms you can qualify for at 28% front-end DTI.

Mortgage Term Interest Formula

Monthly Payment = P × [r(1+r)^n] / [(1+r)^n - 1]
where P = principal, r = monthly rate, n = total payments

Total Interest = (Monthly Payment × n) - Principal

Interest Saved vs 30yr = Total Interest (30yr) - Total Interest (Term)

Example: $350,000 at 6.75%
10yr: $3,987/mo — Total Interest: $128,475
15yr: $3,101/mo — Total Interest: $208,125
20yr: $2,662/mo — Total Interest: $289,000
25yr: $2,423/mo — Total Interest: $376,900
30yr: $2,270/mo — Total Interest: $467,100 (baseline)
40yr: $2,126/mo — Total Interest: $620,300

20yr savings vs 30yr: $178,100 for only $392 more/mo

The relationship between term and interest is not linear — going from 30 to 20 years saves dramatically more interest per extra dollar paid than going from 20 to 15 years. This is why the 20-year term is considered the sweet spot for most borrowers.

Example: The Miller Family Term Decision

$400,000 loan at 6.75% — comparing all terms

10-year monthly	$4,557 — saves $153K vs 30yr
15-year monthly	$3,544 — saves $118K vs 30yr
20-year monthly	$3,042 — saves $82K vs 30yr
25-year monthly	$2,769 — saves $43K vs 30yr
30-year monthly	$2,594 — baseline
Sweet Spot (20yr)	Only $448/mo more than 30yr, saves $82,000

The Miller family earns $110,000/year. They comfortably qualify for the 20-year term ($3,042/mo = 33% of gross income, or 24% at 28% DTI threshold). Choosing 20 over 30 years saves them $82,000 in interest — enough for college tuition or retirement contributions.

Frequently Asked Questions

For most borrowers, yes. The 20-year term typically requires about 15-20% more monthly payment than the 30-year but saves 35-40% of the total interest. Compare that to the 15-year, which requires 35-40% more monthly payment to save another 10-15% in interest. The marginal return diminishes significantly once you go below 20 years. That said, the "best" term depends entirely on your financial situation — cash flow, job security, and other financial goals all matter.

Yes, typically. Shorter terms carry less risk for lenders, so rates are lower. The 15-year mortgage rate is usually 0.5-0.75% lower than the 30-year rate. The 20-year rate falls in between. This calculator uses the same rate for all terms to isolate the term effect, but in practice you should get quotes for each term separately — a lower rate on a 15-year makes it even more attractive than this calculator shows.

This is the flexibility argument — get the 30-year for the lower required payment but pay as if it were a 15-year. The advantage is flexibility: if you lose your job or face an emergency, your required payment is lower. The disadvantage is discipline: many people pay the minimum when life gets expensive. If you have stable income and good financial discipline, the 15-year is better because it forces the savings. If cash flow varies, the 30-year with extra payments gives you a safety valve.

Yes, though they are less common in the US than in Canada and the UK, where 25 years is the standard term. Some US lenders offer 25-year terms, and some government-backed programs allow custom terms. The 25-year offers a middle ground between 20 and 30 years but is less commonly marketed. You can also achieve a 25-year equivalent by taking a 30-year mortgage and making extra payments systematically.

The 40-year mortgage was developed primarily as a loan modification tool to help struggling homeowners lower their monthly payment and avoid foreclosure. The FHA officially began allowing 40-year modifications in 2023 for borrowers in hardship. While it is technically available as a purchase loan from some non-QM lenders, it is rarely used for initial home purchases because the payment savings vs the 30-year are minimal (about $100-150/mo on a $350K loan) while the total interest cost ballooms by $150,000 or more.