Rates dropped and your inbox is full of lender promotions. But "should I refinance?" is the wrong question. The right one is: "how long will it take me to break even?" That single number tells you everything.
What refinancing actually does
Refinancing replaces your existing mortgage with a new one, typically with a new lender, a new interest rate, a new loan term, and new closing costs. The goal is usually to lower your monthly payment, reduce your total interest paid, or both. Sometimes homeowners refinance to change their loan term (from 30 to 15 years, for example) or to access built-up equity as cash.
Critically, refinancing is not free. Closing costs on a refinance typically run 2–5% of the loan amount, paid either upfront or rolled into the new loan balance. This is the cost you need to recover through monthly savings, and it is the starting point for every refinance decision.
The only calculation that matters
Before any other consideration, run the break-even calculation. It tells you how many months it takes to recover the cost of refinancing through your monthly savings.
Example: If refinancing costs $9,000 in closing costs and lowers your monthly payment by $210, your break-even point is 43 months, roughly 3.5 years. If you plan to stay in the home longer than that, refinancing makes financial sense. If you're moving in two years, you'd lock in a loss.
You may have heard that refinancing makes sense when you can drop your rate by at least 1%. That's a useful rule of thumb, but it ignores how long you plan to stay, your current balance, and your actual closing costs. The break-even calculation is the only reliable test. A 0.5% rate drop can make excellent sense for someone staying long-term; a 1.5% drop can still be a bad deal if you're selling in 18 months.
Run the numbers in our free refinance break-even calculator, powered by today's live 30-year national average rate. No signup required.
When refinancing makes sense
- Rates have dropped meaningfully and your break-even point is well within your planned time in the home. A break-even under 36 months is generally very compelling.
- Your credit score has improved since you took out the original loan. A better score can get you a lower rate even if market rates haven't moved much.
- You want to shorten your loan term. Moving from a 30-year to a 15-year loan dramatically reduces total interest paid, though your monthly payment will rise. The rate is also typically lower on a shorter term.
- You have an adjustable-rate mortgage (ARM) nearing the end of its fixed period. Locking into a fixed rate before your ARM adjusts can eliminate future payment uncertainty.
- You need to access equity for a major expense (cash-out refinance) and the rate is reasonable relative to other borrowing options.
When it probably doesn't
- You're planning to sell within 2–3 years. Closing costs will almost certainly exceed your accumulated savings.
- You're deep into your loan term. Early mortgage payments are heavily interest-weighted. If you're 20 years into a 30-year loan, refinancing into a new 30-year loan resets the amortization clock; you would pay significantly more total interest over your lifetime even at a lower rate. A 15-year refi may still make sense.
- Closing costs are exceptionally high. In some markets and situations (investment properties, jumbo loans), costs can push the break-even past 5 years. Run the numbers.
- You're close to paying off PMI on your existing loan. Refinancing starts your LTV clock over, potentially reinstating PMI on the new loan.
"Refinancing into a new 30-year loan when you're already 20 years in often costs more in total interest, even at a lower rate."
Rate-and-term vs. cash-out
Rate-and-term refinance
The most common type. You replace your existing loan with a new one at a lower rate and/or different term. Your loan balance stays roughly the same (plus any rolled-in closing costs). This is purely about reducing your cost of borrowing.
Cash-out refinance
You borrow more than your current balance and receive the difference as cash. For example, if you owe $280,000 and your home is worth $450,000, you might refinance into a $330,000 loan and take $50,000 in cash. The rate on a cash-out refinance is typically 0.25–0.5% higher than a comparable rate-and-term loan, reflecting the additional risk. Most lenders require you to retain at least 20% equity after the cash-out.
What you'll need to qualify
Qualifying for a refinance is similar to getting the original mortgage:
- Credit score. Most lenders want 620+ for a conventional refinance; 740+ gets the best rates. Check your score before applying so there are no surprises.
- Equity. Most conventional refinances require at least 20% equity (80% LTV or less) to avoid PMI on the new loan. Cash-out refinances require more equity still.
- Debt-to-income ratio (DTI). Most lenders cap DTI at 43–50%. If your income has changed since you bought, this bears watching.
- Employment and income verification. You'll need two years of W-2s, recent pay stubs, and bank statements. The documentation requirements are similar to your original purchase.
Once you've applied and received a loan estimate, you can lock your rate for 30–60 days while the loan is processed. Do not float your rate hoping for a further drop unless you have strong conviction; a rate that moves against you before closing can erase your projected savings. Lock when the break-even math works for you.
Refinance windows open and close quickly. By the time you've pulled your statement, compared rates, and run the numbers, the opportunity can shift. CasaCrow calculates your current break-even point continuously and alerts you when a rate move creates a genuine savings opportunity for your specific loan.
Know when your refinance window opens
CasaCrow calculates your break-even in real time and alerts you when the math works.
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