Comparison · Reviewed 15 September 2026
A HELOC adds a second loan on top of your mortgage; a cash-out refinance replaces the mortgage itself.
Both let you borrow against home equity, but they're structurally different products. A HELOC is a revolving second lien you draw against as needed. A cash-out refinance pays off your existing mortgage and replaces it with a single larger loan, disbursing the difference in cash.
Structural comparison
| Feature | HELOC | Cash-out refinance |
|---|---|---|
| Loan structure | Second lien, on top of existing mortgage | Replaces existing mortgage entirely |
| How funds are accessed | Revolving credit line — draw as needed during the draw period | Lump sum, disbursed once at closing |
| Typical rate type | Variable, tied to an index (often prime rate) | Fixed or variable, set for the life of the new loan |
| Effect on existing mortgage rate | None — original mortgage and its rate are untouched | Replaced — you lose your original mortgage's rate entirely |
| Closing costs | Lower, often a smaller flat fee or none | Higher — full refinance closing costs on the entire new loan amount |
| Repayment | Interest-only during draw period, then principal + interest during repayment period | Standard amortizing payment from day one, over the new loan's full term |
Why the existing mortgage rate matters most
The single biggest factor in this decision is usually the rate on your current mortgage relative to current refinance rates. If your existing mortgage carries a materially lower rate than what a new cash-out refinance would charge on the entire loan balance, a HELOC preserves that low rate on the original balance and only charges its own rate on the new amount borrowed. A cash-out refinance resets the rate on the whole balance, which can cost more in total interest even if the refinance rate itself looks reasonable.
When a HELOC fits better
- You have a low rate on your existing mortgage that you don't want to lose
- You need flexible, as-needed access rather than a single lump sum (for example, a home renovation paid out in stages)
- You want lower upfront closing costs
- You're comfortable with a variable rate on the amount you draw
When a cash-out refinance fits better
- Current refinance rates are at or below your existing mortgage rate, so replacing it costs nothing extra
- You want one predictable payment instead of two loans to track
- You need the full amount as a lump sum immediately (debt consolidation, a single large purchase)
- You'd rather lock a fixed rate on the full balance than carry variable-rate exposure
How to choose
Start by comparing your existing mortgage rate to current refinance rates using the refinancing break-even calculator — if refinancing the whole balance doesn't clearly beat keeping your current rate, a HELOC is usually the cheaper way to access equity. Model the actual dollar cost of both paths, including closing costs and the interest rate spread, rather than choosing based on which one sounds simpler.