Choose between a cash-out refinance and a HELOC by comparing what happens to the existing first mortgage, how much cash is needed, fixed-versus-variable rate exposure, costs, monthly payment and the expected payoff timeline. The lowest advertised rate is not enough to make the decision.
The first mortgage is the dividing line.
A cash-out refinance replaces the current first mortgage with a larger new first mortgage. A HELOC generally keeps the current first mortgage and adds a revolving second lien. If the existing first mortgage has a favorable fixed rate, preserving it can be economically important.
As of August 20, 2026, Freddie Mac's national average 30-year fixed mortgage rate was 6.65%. That is not a cash-out or HELOC quote, but it is useful market context when a homeowner is comparing a much lower existing first-mortgage rate against a new structure.
Side-by-side comparison
| Decision point | Cash-out refinance | HELOC |
|---|---|---|
| Existing first mortgage | Replaced | Generally preserved |
| Access to funds | Eligible proceeds generally at closing | Revolving access during the draw period, subject to line terms |
| Rate structure | Depends on selected first-mortgage product | Often variable |
| Payment structure | One new first-mortgage payment | Existing first mortgage + separate HELOC payment |
| Best use question | Is replacing the first mortgage justified by the cash need and overall economics? | Is keeping the first mortgage worth a separate lien and variable-rate exposure? |
When cash-out can make more sense
- The amount needed is substantial relative to the existing mortgage balance.
- The current first-mortgage rate is not materially better than the proposed structure.
- A single fixed-payment structure is preferable.
- The borrower is consolidating debts and wants to evaluate the entire liability structure at once.
When a HELOC deserves a closer look
- The existing first mortgage has a low fixed rate that would be expensive to replace.
- The homeowner needs a smaller amount relative to the first-mortgage balance.
- Funds will be used in stages rather than all at once.
- The borrower understands and can tolerate variable-rate/payment risk.
Run the numbers in this order.
Existing first mortgage
Balance, rate, remaining term and payment.
Cash needed
Use the defined need rather than the maximum amount available.
Total payment
Compare the new first mortgage against the existing first + HELOC payment.
Costs
Account for closing costs, fees and any annual or transaction charges.
Timeline
Estimate how long the equity debt is likely to remain outstanding.