15-year vs. 30-year mortgage: the real tradeoff

01 The rate gap, and why it exists

As of mid-2026, the 15-year fixed rate has been running roughly 0.6 to 0.8 percentage points below the 30-year fixed rate — recent Freddie Mac survey data has the 30-year averaging in the mid-6% range and the 15-year in the high-5% range. That gap moves with the broader rate environment but has held in a similar range for years.

The discount exists because a shorter loan is less risky to the lender in a specific way: less time for the borrower's circumstances, and the broader economy, to change before the loan is repaid. You are being paid, in the form of a lower rate, for taking on a shorter and less flexible repayment schedule.

02 The payment difference is the real decision

The rate gap is modest. The payment gap is not. Compressing the same loan amount into half the time, even at a lower rate, produces a materially higher required monthly payment — commonly somewhere in the range of 30% to 45% higher, depending on the specific rates involved.

This is the actual tradeoff, and it's worth stating plainly: a 15-year term is not a better version of a 30-year term. It is a different, more demanding commitment that happens to come with a rate discount as compensation.

03 What each term costs in total interest

Because a 15-year loan combines a lower rate with a much shorter compounding period, the total interest paid over the life of the loan is typically less than half of what the same original balance would cost on a 30-year term — often dramatically less. This is the number most often used to argue for the shorter term, and it's a real and large number. It is also, in isolation, a misleading one, because it ignores what else you could have done with the monthly difference.

04 Equity builds on a completely different curve

Every fixed-rate mortgage front-loads interest and back-loads principal, but the effect is far more pronounced on a 30-year term. In the early years of a 30-year loan, the overwhelming majority of each payment services interest; on a 15-year loan, because the same balance is being retired twice as fast, a much larger share of every payment goes to principal from day one.

The practical result: at the five-year mark, a 15-year loan will typically have retired a meaningfully larger share of the original balance than a 30-year loan on the same amount — often several times as much. If home equity is a goal in itself, independent of total interest paid, the 15-year term reaches any given equity milestone considerably earlier.

05 A worked side-by-side

Illustrative figures using rates in the current range — approximately 6.55% for a 30-year term and 5.90% for a 15-year term — on a $400,000 loan.

The 15-year term saves roughly $315,000 in interest on this example — a large, real number. It also demands $795 more every month for fifteen years, with materially less flexibility if income drops, a job is lost, or an emergency requires that cash instead.

06 Who each term actually fits

07 The middle path: 30-year loan, 15-year discipline

A common approach splits the difference: take the 30-year loan for its lower required payment and payment flexibility, then voluntarily make extra principal payments when cash allows, targeting something close to a 15-year payoff pace. This keeps the lower mandatory payment as a safety net in a bad year, while capturing much of the interest savings in years when the budget allows extra.

The tradeoff is real, though: you give up the discounted 15-year rate itself, since that rate is only available if you actually take the 15-year product. And the strategy only works if you have the discipline to actually make the extra payments consistently rather than treating "I'll pay extra when I can" as a plan that quietly never happens.

08 Other terms worth knowing about

Fifteen and thirty are the two most common terms, but not the only ones. Twenty-year fixed loans exist at some lenders and split the difference in both payment and rate. Ten-year terms are available, mostly used for refinancing late in a mortgage's life rather than for a purchase. Adjustable-rate mortgages offer a lower initial rate for a fixed period before adjusting, which trades long-term certainty for near-term savings — a different kind of tradeoff than the one this article covers, and one that deserves its own separate evaluation.

09 How to decide

• Run both payments against your actual budget, not just against what a lender says you qualify for. Qualifying and comfortable are different thresholds.
• Price in the worst case, not the current one — a job loss, a medical event, a second income pausing for parental leave. The 15-year payment needs to survive that scenario, not just today's.
• Compare what else the monthly difference could do — retirement contributions, an emergency fund that doesn't yet exist, higher-interest debt.
• Get quotes for both terms from the same lender on the same day. The rate gap moves, and only a real quote tells you what it is right now for your credit profile and loan amount.

Once you have real quotes for both, run each through the Calcubear calculator and compare the equity curve directly rather than relying on a rule of thumb — then weigh the year-by-year equity gap against the monthly payment gap you'd be living with the entire time.