15-Year vs 30-Year Mortgage: Which Saves You More?

The Numbers Side by Side

When the 15-Year Is the Better Choice

You can comfortably afford the higher payment. "Comfortably" means the higher payment still keeps your total housing costs below 28% of gross income, leaves a meaningful emergency fund intact, and doesn't crowd out retirement contributions. If the 15-year payment is a stretch, it's not the right choice regardless of the savings.

You're close to retirement. A 15-year mortgage taken at age 50 is paid off by 65. A 30-year taken at the same age carries into your 80s — potentially into a period of fixed income where a large mortgage payment is burdensome.

You want the lowest interest rate available. The rate differential between 15 and 30-year mortgages means the 15-year costs less per dollar borrowed even before the term length is considered.

You're disciplined with money but lack investment willpower. Forced equity building through a higher mortgage payment is a reliable wealth-building mechanism. If you would spend the extra $726 rather than invest it, the 15-year wins by default.

When the 30-Year Makes More Sense

Budget flexibility matters more than interest savings. The $726/month difference could fund your emergency fund, children's education savings, or retirement contributions. Eliminating all financial flexibility to save on mortgage interest isn't always the optimal trade.

You have other high-interest debt. Paying down a 7% student loan or 20% credit card with that extra $726/month produces better returns than the interest savings from a 15-year mortgage.

You're early in your career with income expected to grow. A 30-year keeps payments low now and allows contributions to retirement accounts while your salary grows. You can always make extra payments later.

The Middle Path: 30-Year with Extra Payments

The 30-year mortgage with voluntary extra principal payments is often the most flexible approach for financially disciplined borrowers. You get the lower required payment as a safety net — but you can pay extra in good months and scale back if circumstances change.

Making one extra mortgage payment per year (paying 13 payments instead of 12) on a 30-year loan typically shaves 4–5 years off the term and saves tens of thousands in interest. Paying an extra $300–$500/month can reduce a 30-year to effectively a 20-year payoff.

The critical discipline: the extra payments only happen if you actually make them. If the extra cash would genuinely go toward extra principal, this works. If it would drift into spending, the forced structure of a 15-year is more effective.

The Opportunity Cost Question

The most nuanced part of this decision: what would you do with the extra $726 per month if you chose the 30-year?

If that money goes into an index fund averaging 8% annually, the 30-year may produce more total wealth over time — especially in a 6% mortgage rate environment where the after-tax mortgage rate (with deduction) is even lower. This is the "don't pay off a low-rate mortgage early" argument.

The counterargument: investment returns are not guaranteed. A mortgage payment is mandatory. Paying down the mortgage is a guaranteed return equal to your interest rate — no market risk. For risk-averse households or those near retirement, the guaranteed return of mortgage paydown can be more appropriate than market exposure.

There's no universal right answer here. It depends on your mortgage rate, expected investment returns, tax situation, and risk tolerance — the kind of decision where speaking with a fee-only financial planner produces real value.

Mortgage Terms in the UK, India, and Canada

UK: UK mortgages work differently — most are interest-only or repayment mortgages with 2-to-5 year fixed periods, after which the rate reverts to a variable rate (SVR) or is refinanced to a new deal. Full mortgage terms typically run 25–35 years on repayment mortgages. The concept of a fixed-rate 15-year or 30-year mortgage as standard doesn't apply — UK borrowers typically fix for 2 or 5 years at a time. Shorter overall terms are possible and common — many UK buyers aim to be mortgage-free by retirement.

India: Indian home loans are typically floating rate (linked to MCLR or REPO rate) with terms of 10–30 years. Most borrowers choose longer terms (20–30 years) to keep EMIs manageable, then make prepayments when possible. Unlike the US, Indian home loan borrowers face no prepayment penalties on floating rate loans per RBI rules — making the strategy of taking a long term but paying aggressively when possible quite effective. Details at rbi.org.in.

Canada: Canadian mortgages have amortisation periods (like a US loan term) of typically 25 years for insured mortgages and up to 30 years for uninsured (20%+ down). However, mortgage terms are fixed for shorter periods — typically 1, 2, 3, or 5 years — before renewal at prevailing rates. A 25-year amortisation with a 5-year fixed term means the rate is set for 5 years, then renegotiated. Shortening the amortisation period works similarly to choosing a 15-year in the US — higher payments, less total interest. CMHC guidance at cmhc-schl.gc.ca.