The short answer
Use a HELOC if any of these are true:
- Your existing mortgage rate is good (under 6%) and you don't want to lose it
- You want flexibility — to draw what you need over time, not all upfront
- You're not sure exactly how much you'll need
- You want to minimize closing costs
- You'll likely pay back the borrowed amount within 5-10 years
Use a cash-out refinance if any of these are true:
- Your existing mortgage rate is high enough that a refinance makes sense regardless
- You need a specific lump sum and want fixed rate certainty
- You want one monthly payment, not two
- You'll hold the borrowed money for the long term (15+ years)
- You want maximum tax simplicity
The detailed comparison
Structure
HELOC: A second loan (junior lien) on your home. Your existing mortgage stays in place untouched. You add a credit line on top, secured by the equity above the first mortgage.
Cash-out refi: A NEW first mortgage that's larger than your current one. The new loan pays off your existing mortgage and gives you the difference in cash.
Interest rates
HELOC: Almost always variable, tied to prime rate plus a margin. Currently 7.25% prime + 0-2.5% margin = 7.25-9.75% APR for most borrowers.
Cash-out refi: Almost always fixed for 15 or 30 years. Currently 7.0-7.75% for most well-qualified borrowers.
The catch: A cash-out refi rate at 7.5% sounds similar to a HELOC at 8.0%, but the HELOC rate only applies to the amount you've drawn. The cash-out refi rate applies to your entire mortgage balance — including the existing portion you wouldn't otherwise have refinanced.
Closing costs
HELOC: $0 to $500 typical. Some lenders charge nothing for HELOCs because their margin on the rate covers their costs.
Cash-out refi: 2-5% of the loan amount. On a $400K refinance, that's $8K-$20K, often rolled into the loan balance.
Monthly payment structure
HELOC: Interest-only payments during the 10-year draw period (low). Then amortizing payments during the 20-year repayment period (higher). Two phases.
Cash-out refi: Same fixed amortizing payment for the entire 15 or 30-year term. Predictable, single phase.
Tax treatment
Both follow the same rule: interest is tax-deductible only if the borrowed funds are used to buy, build, or substantially improve the home that secures the loan. Other uses (debt consolidation, education, vacation) make the interest non-deductible.
Real-world scenarios
Scenario 1: $40K kitchen remodel, current mortgage at 3.25%
Recommendation: HELOC. You don't want to give up your 3.25% rate to refinance into a 7.5% mortgage just to access $40K. A HELOC adds the borrowing capacity without touching the first mortgage. Even at 8.5% HELOC rate, the math beats refinancing your whole mortgage.
Scenario 2: $200K business capital, current mortgage at 7.25%
Recommendation: probably HELOC, possibly cash-out refi. The variable rate exposure of a HELOC at this size is concerning. A cash-out refi at 7.0% might give you the lump sum you need with rate certainty and a similar overall cost. Run both numbers carefully.
Scenario 3: Debt consolidation, $50K of credit card debt at 22% APR
Recommendation: HELOC. Both options work, but the HELOC's lower closing costs make it the more efficient fit. Make sure you actually pay off the credit cards and don't run them up again — the trap with debt consolidation is treating the cleared balances as fresh credit.
Scenario 4: $300K college fund for two kids over 8 years
Recommendation: HELOC, set up early. You'll draw the money in chunks (each tuition bill). HELOC charges interest only on what you've drawn. A cash-out refi gives you all $300K upfront and you pay interest on the full amount immediately, even before the first tuition bill arrives.
Scenario 5: $80K to buy out a partner in a divorce or business
Recommendation: HELOC. Single lump-sum need, defined timeline (you'll likely repay in 5-7 years from other proceeds). HELOC's low closing costs win.
The single biggest mistake people make
Refinancing their entire mortgage to access $30-50K in cash, when a HELOC would have done the same thing without touching the first mortgage. This is especially painful if your existing mortgage rate is below 5% — you're effectively trading a great rate on $400K to access $40K. The math almost never works.
How we'd help you decide
The 60-second rate check on our site quotes you a HELOC rate based on your situation. If you also want to compare against a cash-out refi, mention it in the application notes — we'll model both side-by-side and show you which option produces lower total cost over 5, 10, and 20 years for your specific scenario.
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