What is the real difference between a HELOC and a cash-out refinance?
Both products let you convert home equity into usable cash, but they work in fundamentally different ways.
A HELOC (home equity line of credit) sits alongside your existing mortgage as a second lien. Your first mortgage stays exactly as it is — same rate, same servicer, same payment. You get a revolving line you can draw from, repay, and draw again during the draw period (typically 10 years), paying interest only on the outstanding balance.
A cash-out refinance replaces your entire first mortgage with a brand-new, larger loan. You receive the difference between the new loan amount and your old balance as a lump sum at closing. From that point on, you have one loan payment at whatever rate the market offers today.
How do the costs compare?
| Factor | HELOC | Cash-out refinance |
|---|---|---|
| Closing costs | Often $300–$1,000 (sometimes waived) | Typically 2%–5% of new loan amount |
| Rate type | Usually variable (tied to prime rate) | Fixed or adjustable — your choice |
| Your existing mortgage | Stays in place | Paid off and replaced |
| Funds structure | Revolving line — draw as needed | Lump sum at closing |
| Monthly payment | Interest-only on drawn balance during draw period | Full principal + interest from day one |
| Time to close | Often 2–4 weeks | Often 4–6 weeks |
When does keeping your first mortgage (HELOC) make more sense?
If your current mortgage rate is meaningfully lower than today’s market rates, replacing it with a cash-out refi would cost you more in interest over the life of the loan. That spread — between your existing rate and the new rate — is the single most important number to calculate before deciding.
A HELOC is generally the smarter move when:
- Your existing mortgage rate is below current market rates.
- You need flexibility — you are not sure exactly how much you will need or when (a renovation that unfolds in phases, for example).
- You want to keep upfront costs low.
- You plan to pay down the balance quickly and want to avoid restarting a 30-year amortization clock.
When does a cash-out refinance make more sense?
A cash-out refi can be the right call when:
- Current rates are similar to or lower than your existing mortgage rate — refinancing is not costly.
- You want one predictable, fixed monthly payment rather than a variable rate line.
- You need a large lump sum upfront (a single major purchase or payoff) rather than staged draws.
- You prefer the simplicity of a single loan and a single servicer.
What about the rate risk of a HELOC?
Most HELOCs carry a variable rate tied to the prime rate, which moves with Federal Reserve policy. That means your monthly interest cost can rise or fall over time. Some lenders allow you to lock a portion of your HELOC balance into a fixed rate — worth asking about if rate predictability matters to you.
A cash-out refi, by contrast, typically comes with a fixed rate for the full loan term, giving you certainty regardless of what rates do later.
What about tax deductibility?
Interest on both products may be deductible when the funds are used to “buy, build, or substantially improve” the home securing the loan — but the rules are nuanced and depend on your situation. Consult a tax professional before making decisions based on potential deductibility.
Which product should you consider first?
Work through these questions in order:
- Is your current mortgage rate lower than today’s rates? If yes, lean toward a HELOC.
- Do you need a precise lump sum or flexible access? Lump sum favors a cash-out refi; flexible access favors a HELOC.
- How much can you absorb in upfront closing costs? If costs are a concern, a HELOC usually wins on this dimension.
- Do you want a variable or fixed rate? Fixed payments favor a cash-out refi.
Neither product is universally superior. The right choice depends on your existing rate, how you plan to use the funds, and how much rate variability you are comfortable carrying.