You should refinance your mortgage when you can lower your interest rate by at least 0.75 to 1 percentage point and plan to stay in the home long enough to recoup closing costs. The break-even point is typically 18 to 36 months. Refinancing also makes sense when switching from an adjustable-rate to a fixed-rate mortgage for payment stability. Here is the complete decision framework I use.
The Basic Math
Refinancing makes sense when the savings outweigh the costs. That's it. The challenge is calculating both accurately.
**The costs:** - Closing costs (typically 2-5% of loan amount) - Appraisal fees ($300-600) - Title insurance - Origination fees - Your time and hassle
**The savings:** - Lower interest rate = lower monthly payment - Lower monthly payment × remaining months = total savings
The break-even point is when your cumulative savings equal your closing costs. If you'll move or sell before the break-even point, refinancing probably doesn't make sense.
When Refinancing Usually Makes Sense
**Rate drop of 0.75% or more** - This used to be 1%, but with larger loan amounts, even 0.75% can justify the costs. On a $400,000 loan, 0.75% is $3,000/year in savings.
**You're staying put for 3+ years** - Need time to recoup closing costs. The longer you stay, the more you benefit.
**Your credit improved significantly** - If you bought with a 650 score and now have a 750, you might qualify for much better rates.
**You have equity** - 20% equity means no PMI. If you've been paying PMI, refinancing to drop it can be worth it even without a rate change.
**You want to change loan terms** - Going from 30-year to 15-year to pay off faster. Or going from 15 to 30 to lower payments (though you'll pay more interest overall).
When It Probably Doesn't Make Sense
**You're moving soon** - Won't recoup costs.
**The rate difference is tiny** - A 0.25% drop on a small loan might save you $50/month. Not worth the hassle.
Run the numbers for your situation: Use our free refinance calculator to compare your current loan with a new rate and find your breakeven point.
**You're already far into your loan** - If you're in year 20 of a 30-year mortgage, refinancing into a new 30-year loan restarts the clock. You'll pay more total interest even with a lower rate.
**Cash-out refinancing for consumer spending** - Turning home equity into a vacation or car purchase is risky. You're converting unsecured debt capacity into debt secured by your house.
The Process Reality
Refinancing isn't quick or painless. Expect:
1. **Rate shopping** (1-2 weeks) - Get quotes from at least 3 lenders 2. **Application** (1-2 hours of paperwork) 3. **Underwriting** (2-4 weeks) - They'll verify everything again 4. **Appraisal** (1-2 weeks) - Your home's value matters 5. **Closing** (1-3 hours of signing)
Total timeline: Usually 30-45 days. Sometimes faster, sometimes slower.
Cash-Out Refinancing: Be Careful
Cash-out refinancing lets you borrow more than you owe and pocket the difference. It can be smart for: - Home improvements that add value - Consolidating high-interest debt (if you've fixed the spending habits) - Major necessary expenses
It's usually a bad idea for: - Consumer purchases - Investments (using your home as collateral for stocks is gambling) - Anything you could save up for instead
You're putting your home on the line. Treat that seriously.
Rate Lock Timing
Once you find a good rate, lock it. Rates can change daily. A 30-day lock is usually free; 45-60 days might cost extra.
Don't try to time the market perfectly. If the rate makes financial sense today, lock it. Waiting for "just a little lower" often backfires.
The Comparison I Use
Here's how I compare refinance offers:
1. Get the Loan Estimate from each lender (required by law) 2. Look at the APR (includes fees, not just rate) 3. Look at total closing costs 4. Calculate break-even: closing costs ÷ monthly savings 5. Consider how long you'll keep the loan
The lowest rate isn't always the best deal. A slightly higher rate with much lower closing costs might be better if you might move in a few years.
My Honest Take
Refinancing is a financial decision, not an emotional one. Run the numbers. If it makes sense, do it. If it doesn't, don't—no matter how many times your lender calls to tell you rates are "historically low."
And if you refinanced in 2020-2021 at 3% or below? You probably shouldn't refinance again unless you absolutely need to change your loan terms. Those rates were a historical anomaly.
