When to Refinance Your Mortgage

Why refinancing is a math question, not a rate question

When rates fall, headlines shout "refinance now." When rates rise, everyone says wait. Neither is right for you until you run the break-even. Refinancing only pays off if the savings outlast the cost before you sell or refinance again.

This guide covers when refinancing makes sense, how to compute the break-even point, and which costs to include so the decision is honest.

Step 1: Know what refinancing replaces

A refinance pays off your old mortgage with a new loan, ideally at a lower rate, a shorter term, or both. The goal is usually one of:

• lower the monthly payment by reducing the rate
• shorten the term (for example 30 to 15 years) to save total interest
• switch from an adjustable to a fixed rate for stability
• tap equity with a cash-out refinance (use with caution)

The Refinance Calculator compares your current loan to a proposed new one.

Step 2: Calculate the break-even point first

The break-even point is the number of months it takes for monthly savings to repay the refinance closing costs. If costs are $4,000 and you save $150 a month, the break-even is about 27 months.

• break-even under ~24 months is strong
• 24 to 48 months is reasonable if you will stay
• beyond 48 months, only refinance if you are confident you will stay long term

If you sell or refinance again before break-even, you lose money on the deal.

Step 3: Include the full cost, not just the rate

Closing costs on a refinance commonly run 2% to 5% of the new loan. They can include:

• lender origination and underwriting fees
• appraisal and title fees
• discount points if you buy down the rate
• prepaid interest and escrow funding

A lower rate with high costs can have a worse break-even than a slightly higher rate with low costs. The Refinance Calculator lets you enter both to see the real net savings.

Step 4: Watch the loan term reset trap

A common mistake is refinancing a 30-year loan you are five years into, back into a new 30-year loan. Your payment may drop, but you restart the clock and can pay more total interest over time.

If your aim is saving interest, refinance into a term that keeps or shortens your remaining payoff window. The Extra Mortgage Payments Calculator shows how additional payments change the total cost.

Step 5: Consider a shorter term instead of just a lower rate

Refinancing from 30 to 15 years usually carries a lower rate and saves large interest, but raises the monthly payment. The right move depends on cash flow:

• if the higher payment still leaves a comfortable margin, a shorter term is efficient
• if it strains your budget, keep the longer term and pay extra when you can

The Mortgage Calculator models both terms side by side.

Step 6: Be cautious with cash-out refinancing

A cash-out refinance borrows more than you owe and gives you the difference. It can make sense for a low-rate need like a renovation, but it:

• increases your loan balance and total interest
• resets or extends your term
• turns consumer spending into secured debt against your home

Compare it against other options before tapping home equity. The How Much House Can You Afford calculator helps keep the new payment realistic.

A realistic example

A homeowner with a $300,000 balance at 7% on 28 years remaining refinances to 6% on a new 30-year loan. The payment drops, but total interest over the longer term may rise. If instead they refinance to a 20-year term at 6%, the payment may stay similar while total interest falls. The calculator shows which path actually saves.

Common refinancing mistakes

• Refinancing without computing the break-even point.
• Resetting to a full 30-year term and paying more interest overall.
• Ignoring closing costs in the savings math.
• Chasing a tiny rate drop that never recovers its cost.
• Using cash-out refinance for discretionary spending.

Related next steps

Model your situation in the Refinance Calculator, check the broader picture with the Mortgage Calculator, and see whether extra payments beat a refinance using the Extra Mortgage Payments Calculator. For timing decisions, read When Refinancing Your Mortgage Is Worth It.