15-Year vs 30-Year Refinance: Which Term Should You Choose?

When you refinance, the term you pick matters as much as the rate. A 15-year loan and a 30-year loan on the same balance produce very different payments and very different total costs. This comparison lays out the trade-offs so you can match the term to your budget and your goals.

The short version: a 15-year refinance carries a higher monthly payment but a lower rate and dramatically less total interest, while a 30-year refinance keeps the payment low and flexible but costs far more interest over time. Neither is universally better. Run both through the break-even calculator and compare the lifetime-interest line.

The core trade-off

Mortgage interest accrues on the outstanding balance every month, so the faster you pay the balance down, the less interest you hand over in total. A 15-year loan forces a faster payoff with a larger monthly payment, and lenders usually reward that lower risk with a slightly lower interest rate than the 30-year equivalent. A 30-year loan spreads the same balance over twice as many payments, which shrinks each payment but stretches out the interest. The result is a classic tension between monthly affordability and lifetime cost.

What the payments look like

Consider a $300,000 balance. At 5.5% over 15 years, the principal-and-interest payment is roughly $2,450 a month, and total interest over the life of the loan is about $141,000. At 6.0% over 30 years, the payment falls to roughly $1,800 a month, but total interest balloons to about $347,000. The 30-year option saves you around $650 every month, yet costs more than $200,000 extra in interest if you carry it to the end. That single comparison captures the whole decision: lower monthly burden versus far higher total cost.

Reasons to choose the 15-year refinance

The 15-year loan shines when your budget comfortably absorbs the higher payment and your priority is owning the home free and clear. You typically get a lower rate, you build equity quickly because more of each payment goes to principal, and you pay a fraction of the lifetime interest. It is especially attractive for homeowners in their peak earning years who want the mortgage gone before retirement. The discipline is built in: because the payment is contractually higher, you are forced to pay the loan down on schedule rather than relying on willpower.

Reasons to choose the 30-year refinance

The 30-year loan is the safer choice when cash flow is tight or uncertain. The lower required payment leaves room in your budget for emergencies, retirement contributions, or other higher-return uses of the money. Crucially, a 30-year loan does not stop you from paying it off early. You can make the larger 15-year-sized payment voluntarily in good months and drop back to the required amount when money is tight, capturing much of the interest savings while keeping the flexibility. The downside is that most people do not actually make those extra payments, so the interest savings stay theoretical.

The hidden cost of restarting the clock

If you are ten years into a 30-year mortgage and refinance into another 30-year loan, you have quietly turned a 20-year remaining payoff into a 30-year one. Even a lower rate may not overcome the extra decade of interest. This is the single most common refinance mistake. The break-even calculator's lifetime-interest line is designed to expose it: if that number is negative after closing costs, the longer term has eaten your savings. Refinancing into a 15-year loan, or into a 20-year term where available, sidesteps the trap by keeping your payoff date roughly where it was or pulling it earlier.

How break-even differs between the two

Break-even measures how long it takes monthly savings to repay closing costs, so it interacts with term in an important way. A 30-year refinance usually produces a larger monthly payment cut, which means a faster break-even on the closing costs. A 15-year refinance may raise your payment rather than lower it, in which case there is no payment-based break-even at all; the entire benefit comes from slashing total interest and owning the home sooner. That is why you should not judge a 15-year refinance by break-even alone. Look at the lifetime-interest figure instead, because that is where the 15-year loan earns its keep.

A simple way to decide

Start with your monthly budget. If the 15-year payment fits without straining your emergency savings or your retirement contributions, it is usually the cheaper long-term choice. If it does not fit, take the 30-year loan and, if you can, set up an automatic extra payment toward principal so you capture some of the interest savings without locking yourself into the higher required payment. Whichever you lean toward, run both terms through the break-even calculator, write down the monthly payment and the lifetime interest for each, and pick the one whose trade-off you are most comfortable living with. For the full decision checklist, see the refinance decision guide.