The short answer
If your existing mortgage rate is meaningfully below what you'd be offered today, a cash-out refinance makes you surrender that rate on your entire balance in order to access equity. A HELOC leaves your first mortgage untouched and adds a separate credit line behind it.
That is the whole decision in one sentence. Everything below is about the cases where it isn't that simple.
Why this question got so much harder after 2022
For most of the last two decades, "should I refinance and take cash out?" was close to a free question. Rates trended down, so refinancing usually improved your first mortgage anyway, and the cash was a bonus.
That is no longer the situation for most American homeowners.
According to the Federal Housing Finance Agency's National Mortgage Database, 49.9% of outstanding U.S. mortgages carried an interest rate below 4% as of Q1 2026. Roughly half the country is sitting on financing that cannot be replaced at anything close to the same cost.
This is what economists call the rate lock-in effect, and it changes the refinance calculation in a way that a lot of older online advice hasn't caught up to. If you refinance a $400,000 mortgage at 3.5% into a new, larger loan at today's rates, you don't just pay a higher rate on the cash you took out. You pay the higher rate on all $400,000. The cost of the cash is not the cost of the cash — it's the cost of re-pricing the entire debt.
A HELOC avoids that. It sits in second position behind your existing mortgage. Your first loan, its rate, and its remaining term stay exactly as they are.
Side by side
| HELOC | Cash-Out Refinance | |
|---|---|---|
| What happens to your first mortgage | Untouched — rate and term preserved | Replaced entirely with a new, larger loan |
| Rate structure | Typically variable, tied to an index | Typically fixed for the life of the loan |
| How you receive funds | Revolving line — draw what you need, when you need it | Single lump sum at closing |
| Interest charged on | Only the balance you've actually drawn | The entire new loan balance from day one |
| Closing costs | Generally lower | Generally higher — full first-mortgage origination |
| Best when | Your current rate is low, or your need is staged over time | Your current rate is at or above market, or you want payment certainty |
| Main risk | Payment moves if the index moves | You permanently give up your existing rate |
The variable-rate question, answered honestly
The most common objection to a HELOC is that the rate is usually variable. That is a real consideration and it deserves a straight answer rather than a sales answer.
Most HELOCs are priced off the Wall Street Journal prime rate, which stood at 6.75% in July 2026, with the Federal Reserve's target range at 3.50%–3.75%. When the Fed moves, prime typically moves with it, and your HELOC payment follows.
So the honest framing is a trade: a cash-out refinance gives you rate certainty on the new money but costs you your existing rate on the old money. A HELOC preserves your existing rate but accepts rate movement on the new money.
Which trade wins depends on two things most online comparisons skip:
- The ratio. If you have a $500,000 mortgage at 3.25% and need $50,000, you are considering re-pricing ten dollars of cheap debt to access one dollar of new debt. The ratio is brutal. If you have an $80,000 remaining balance at 6.5% and need $60,000, the ratio is nearly even and the calculus flips.
- The duration. Rate variability matters enormously over fifteen years and much less over eighteen months. A homeowner who intends to draw, use, and repay within two years is exposed to far less rate risk than one planning to carry the balance to term.
Where people get this wrong
Comparing the interest rates directly. A 6.75%-ish variable line and a fixed first-mortgage rate are not comparable numbers, because they apply to different balances. Comparing the rates instead of the total interest cost across both loans is the single most common error I see. Run the blended cost, not the headline rate.
Forgetting that a HELOC's cost scales with use. A cash-out refinance starts charging interest on the full amount the day it closes. A HELOC charges only on what you've drawn. If you open a $100,000 line and draw $20,000, you are paying on $20,000. For staged expenses — a renovation with a contractor draw schedule, tuition across several semesters — this difference is substantial and often larger than the rate difference.
Treating closing costs as the deciding factor. They usually favor the HELOC, but they're generally a smaller number than the lifetime rate differential. Don't let the smaller number drive the larger decision.
Assuming the choice is permanent. It isn't. A HELOC taken today does not prevent a cash-out refinance later if rates fall enough to make replacing the first mortgage attractive on its own merits. Choosing the reversible option has value when the future is uncertain.
A decision framework
Work through these in order:
1. What is your current first-mortgage rate, and what would you be offered today?
If the gap is small or your current rate is higher than market, a cash-out refinance is genuinely competitive and may improve your position on both counts. If the gap is large and in your favor, the burden of proof is on the refinance.
2. Do you need the money all at once, or over time?
Lump-sum need with a known amount favors the refinance. Staged or uncertain need favors the line.
3. How long will you carry the balance?
Short horizons blunt the variable-rate risk. Long horizons amplify it.
4. How will you use the funds?
This is not only a strategy question — it is a tax question. Interest on home equity borrowing is deductible only when the proceeds are used to buy, build, or substantially improve the home securing the loan. See our guide to HELOC interest deductibility and speak with a tax professional about your situation.
5. What is your tolerance for payment movement?
Answer this honestly rather than optimistically. A household that would be genuinely stressed by a payment increase should weight certainty more heavily than a spreadsheet suggests.
The bottom line
There is no universally correct answer, and any article that gives you one is selling something. What's true in 2026 is that the rate lock-in effect has shifted the default. When roughly half of outstanding mortgages sit below 4%, the cash-out refinance — long the reflexive answer — now carries a hidden cost that has to be explicitly counted rather than assumed away.
Count it. Then decide.