When does it make sense to refinance a mortgage?

Refinancing typically makes sense when: (1) the new rate is at least 0.75-1% lower than your current rate, (2) you plan to stay in the home long enough to recoup closing costs (usually 3-5 years), and (3) you have enough equity (at least 20% to avoid PMI). The break-even calculation is the most important factor.

How do I calculate the break-even point on a refinance?

Break-even = Total closing costs / Monthly savings. Example: closing costs of $8,000 and monthly savings of $200 → break-even = 40 months (3.3 years). If you plan to stay in the home longer than 3.3 years, the refinance pays for itself.

How much does it cost to refinance?

Closing costs typically run 2-5% of the loan amount. On a $300,000 loan: $6,000-$15,000. Common fees: appraisal ($400-700), title insurance ($1,000-2,000), origination fee (0.5-1% of loan), recording fees, and prepaid interest. Some lenders offer no-closing-cost refinances in exchange for a slightly higher rate.

Should I refinance to a lower payment or a shorter term?

Lower payment (same term, lower rate): reduces monthly cost but extends your remaining payoff. Shorter term (30→15 year): higher payment but massive interest savings. Best strategy depends on your goal — cash flow relief vs total cost savings. A rate-and-term refinance to a lower rate on the same remaining term gives you both.

Does refinancing restart the 30-year clock?

Yes, if you refinance into a new 30-year loan. If you are 7 years into a 30-year mortgage and refinance to a new 30-year, you now have 30 years remaining instead of 23. This is why many people refinance to a 15 or 20-year term — or a 25-year to match their remaining time.

Can I refinance with bad credit?

FHA streamline refinance allows refinancing with lower credit scores (580+) if you already have an FHA loan. Conventional refinancing typically requires 620+, with best rates at 740+. VA IRRRL (Interest Rate Reduction Refinance Loan) is available to veterans with minimal credit checks.

Mortgage Refinance Calculator — When Does Refinancing Actually Save Money?

Last updated: April 20267 min readCalculator Tools

Refinancing your mortgage saves money when the new rate is at least 0.75% lower and you stay long enough to recoup closing costs. On a $300,000 loan, dropping from 7% to 6% saves $199/month — but closing costs of $6,000-$12,000 mean your break-even point is 2.5-5 years. Here is exactly how to run the numbers.

Refinance Savings by Rate Drop

$300,000 remaining balance, 25 years remaining, refinancing to a new 30-year term:

Current Rate	New Rate	Drop	Old Payment	New Payment	Monthly Savings	Annual Savings
7.50%	7.00%	0.50%	$2,098	$1,996	$102	$1,224
7.50%	6.50%	1.00%	$2,098	$1,896	$202	$2,424
7.50%	6.00%	1.50%	$2,098	$1,799	$299	$3,588
7.00%	6.50%	0.50%	$1,996	$1,896	$100	$1,200
7.00%	6.00%	1.00%	$1,996	$1,799	$197	$2,364
7.00%	5.50%	1.50%	$1,996	$1,703	$293	$3,516
6.50%	5.50%	1.00%	$1,896	$1,703	$193	$2,316
6.50%	5.00%	1.50%	$1,896	$1,610	$286	$3,432

Break-Even Calculator

The most important number in any refinance decision:

Closing Costs	Monthly Savings $100	Monthly Savings $200	Monthly Savings $300	Monthly Savings $400
$4,000	40 months (3.3 yr)	20 months (1.7 yr)	13 months (1.1 yr)	10 months
$6,000	60 months (5.0 yr)	30 months (2.5 yr)	20 months (1.7 yr)	15 months (1.3 yr)
$8,000	80 months (6.7 yr)	40 months (3.3 yr)	27 months (2.2 yr)	20 months (1.7 yr)
$10,000	100 months (8.3 yr)	50 months (4.2 yr)	33 months (2.8 yr)	25 months (2.1 yr)
$12,000	120 months (10 yr)	60 months (5.0 yr)	40 months (3.3 yr)	30 months (2.5 yr)

Rule of thumb: If your break-even is under 3 years and you plan to stay 5+ years, the refinance is a strong move. Over 5 years break-even — think carefully unless you are certain you will not move.

The Hidden Cost: Restarting the Clock

This is the trap most refinance calculators do not show you:

Scenario	Monthly Payment	Total Remaining Interest	Payoff Date
Keep current (7%, 23 years remaining)	$2,098	$279,048	Year 2049
Refinance to 6%, new 30-year	$1,799	$347,640	Year 2056
Refinance to 6%, new 25-year	$1,932	$279,600	Year 2051
Refinance to 6%, new 20-year	$2,149	$215,760	Year 2046

The 30-year refinance saves $299/month but costs $68,592 MORE in total interest because you extended the loan by 7 years. The 20-year refinance has a slightly higher payment than your current loan but saves $63,288 in total interest. Always compare total cost, not just monthly payment.

When NOT to Refinance

Rate drop under 0.50%: Closing costs will take 5+ years to recoup for most loan sizes
Planning to move within 3 years: You will not hit break-even
Less than 20% equity: You will trigger PMI, which can eat up most or all of the payment savings
Near the end of your loan: If you are 22 years into a 30-year mortgage, most of your payment already goes to principal — a new loan restarts the interest-heavy early years
Cash-out refinance for non-essential spending: Turning unsecured debt into debt secured by your house is risky

Calculate Your Scenario

Mortgage Calculator — compare current payment vs refinanced payment
Compound Interest Calculator — what investing the monthly savings would grow to
Percentage Calculator — closing costs as percentage of loan
Loan Calculator — for home equity loan alternatives
Discount Calculator — for lender fee negotiations

Run the numbers for your exact refinance scenario — current vs new rate, any term.

Open Mortgage Calculator

Mortgage Refinance Calculator — When Does Refinancing Actually Save Money?

Refinance Savings by Rate Drop

Break-Even Calculator

The Hidden Cost: Restarting the Clock

When NOT to Refinance

Calculate Your Scenario

Related Posts

Mortgage Calculator

15 vs 30 Year Mortgage

Extra Payment Calculator

Amortization Explained