Two homeowners each need $70,000. The first refinances into a single $310,000 mortgage at 6.75% and watches her payment climb by more than $900 a month. The second leaves a 3.5% first mortgage untouched and adds a line of credit that starts at roughly $496 a month. Same money in hand. Very different monthly reality, and very different risk five years from now.
That gap is exactly why the cash out refinance vs HELOC decision is so easy to get wrong. Neither product is universally cheaper. They’re built differently, they price differently, and they reward different situations.
Two loans, two very different structures
Cash-out refinance: you replace your first mortgage
You take out a new first mortgage for more than you currently owe and pocket the difference. If you owe $240,000 on a $450,000 house and pull $70,000, the new loan is $310,000. That’s 68.9% loan-to-value, comfortably under the 80% ceiling most lenders will write.
The catch is baked into the structure itself. The new rate applies to every dollar of that $310,000, not just the $70,000 you actually took out.
HELOC: you leave your first mortgage alone
A home equity line of credit sits behind your existing mortgage as a second lien. You get a credit limit, often up to 85% combined LTV, and draw on it as needed during a draw period that typically runs ten years. For most of that stretch you can pay interest only, which is why the starting payment looks so gentle on paper.
Then the draw period ends. The line converts to a repayment schedule, usually twenty years, and the payment steps up.
Run the numbers on a real example
House worth $450,000. Mortgage balance $240,000 at 3.5%, principal and interest of about $1,078 a month. You need $70,000.
- Cash-out refinance: $310,000 at 6.75% over 30 years runs about $2,011 a month. That’s $933 more than you pay now.
- HELOC: $70,000 at 8.5% on interest-only is roughly $496 a month, for a total housing payment near $1,574.
- HELOC after the draw period: the same $70,000 amortized over 20 years at 8.5% becomes about $608, pushing the total to $1,686.
So the HELOC saves you $437 a month today and still saves around $325 later, provided rates don’t climb. The cash-out refinance costs more in cash flow but locks the rate for three decades and leaves you with one payment instead of two.
Where the costs actually hide
Closing costs on a cash-out refinance typically land between 2% and 5% of the loan amount. On a $310,000 loan that’s $6,200 to $15,500, taken out of the equity you just unlocked unless you pay cash. A detailed breakdown of what a cash-out refi really costs is worth reading before you collect quotes, because the line items vary more between lenders than most people expect.
HELOC costs look friendlier. Many lenders waive closing costs entirely, and the rest usually fall under $500. Read the fine print anyway. Annual fees of $50 to $100 are common, and plenty of HELOCs charge a penalty if you close the line within three years.
The biggest cost isn’t on either closing disclosure though. It’s this: on a cash-out refinance you pay the new rate on the entire balance, while a HELOC only reprices the new money.
When a cash-out refinance makes more sense
The strongest case appears when your current mortgage rate is at or above today’s market. If you’re sitting at 7.25% and can refinance at 6.5%, the cash-out is nearly free in cash-flow terms. You lower your payment and pull equity in a single transaction.
It’s also the better tool when you need a large one-time sum with a fixed rate and a fixed payoff date. A $120,000 addition, a $90,000 debt consolidation, a purchase you can’t finance any other way. Nothing else gives you thirty years of certainty at that scale.
Renovation math deserves its own pass, since the return on a kitchen or an ADU has almost nothing in common with the return on a new roof. There’s a useful framework in this piece on when cash-out refinancing for home improvements actually pays off.
When a HELOC is the better tool
If your first mortgage is at 3.1%, refinancing throws away the best financial asset you own. Paying off a 3.1% loan to borrow at 6.75% is a guaranteed loss, and no amount of convenience makes up for it.
The HELOC also wins when the money arrives in stages. A renovation billed in three phases doesn’t need $70,000 sitting in a checking account earning nothing. Draw $20,000 now, $30,000 in March, the rest in summer, and pay interest only on what’s outstanding.
Modest needs fit well too. Borrowing $25,000 against a $240,000 first mortgage is a mismatch for a full refinance, but it’s a routine HELOC. So does a short payoff horizon. If you can clear the balance in four years, the variable rate matters less than the closing costs you avoided.
One more use case people overlook: opening a HELOC as a standby reserve rather than a spending account. It costs nothing while undrawn and can cover a job loss without touching retirement funds.
The term-reset problem nobody puts in the brochure
This is the quiet cost of a cash-out refinance, and it rarely appears in the loan estimate. Say you’re eleven years into a thirty-year mortgage with nineteen years left. Refinancing starts the clock over at thirty. Your payment drops relative to a shorter term, but you’ve just added eleven years of interest on money you already spent.
On a $310,000 loan at 6.75%, eleven extra years is not a rounding error. If you want the cash without resetting the clock, consider a shorter term or look at a mortgage recast to lower the payment without refinancing at all.
Qualifying looks similar, the underwriting doesn’t
A cash-out refinance is a full first mortgage. Income documentation, appraisal, debt-to-income analysis, credit pull, and typically 30 to 45 days to close. A HELOC is also underwritten, but often faster, sometimes with an automated valuation instead of a full appraisal, and usually 2 to 4 weeks.
Both hinge on the same number. Lenders care about combined loan-to-value, meaning every lien against the house divided by its appraised value. Pushing to 85% combined LTV can cost you a higher rate or a denial, so it’s worth understanding exactly what that percentage signals to an underwriter before you apply. This explainer on what your loan-to-value percentage really tells a lender covers the thresholds that matter.
One HELOC-specific wrinkle: lenders often slash credit limits on existing lines when home values dip, which happened at scale in 2008 and 2020. A fixed-rate cash-out refinance can’t be reduced after closing.
Four questions that settle it
What is my current rate compared to today’s? Below 5%, a HELOC or home equity loan almost always beats a refinance. Above today’s market, the refinance math improves quickly.
How long am I staying? Under five years, the refinance closing costs rarely earn back. Over ten, the fixed rate starts to look valuable.
Do I need a lump sum or a bucket? Lump sum points to a refinance. Staged spending points to a line of credit.
Can I handle the worst-case payment? HELOC rates are tied to prime, which moved from 3.25% to 8.5% in about eighteen months. On a $70,000 balance that’s roughly $300 a month in extra interest. If that number would strain your budget, the fixed rate is worth its premium.
There’s also a third option worth pricing alongside both: a fixed-rate home equity loan, which gives you a second lien with a locked rate. Running all three side by side is the honest comparison, and this analysis of cash-out refinance versus home equity loan costs is a good place to see which one lands cheaper for your balance and credit profile.
Get quotes from at least three lenders, ask each for the total cost of borrowing over your actual expected holding period, and ignore the advertised rate on the postcard. The right answer depends on numbers only you have.