Quick answer: which is better?
The right answer depends almost entirely on one question: is your existing mortgage rate good?
- If your existing mortgage rate is significantly lower than today's rates (for example, you locked in 3% in 2021 and current rates are 7%) — a HELOC is almost always the right choice. You preserve your low rate on the main mortgage and only borrow at today's rate on the smaller piece you actually need.
- If your existing mortgage rate is similar to or higher than today's rates — a cash-out refinance usually makes more sense, because you're consolidating everything into one fixed-rate loan and there's no benefit to keeping the old mortgage.
- If you only need a small or uncertain amount of money over time — a HELOC wins on flexibility, even when the rate math is mixed.
The rest of this guide explains why.
How a cash-out refinance works
A cash-out refinance replaces your existing mortgage with a new, larger one. The new loan pays off the old mortgage and gives you the difference in cash at closing.
If you owe $250,000 on a home worth $500,000 and you do a cash-out refinance for $350,000, you walk away with up to $100,000 in cash before closing costs (typically $5,000–$10,000 on a loan this size). You now have one new mortgage of $350,000 at whatever rate you locked in for the new loan.
Key features:
- Replaces your existing mortgage entirely
- Lump sum at closing — you get all the money at once
- Usually fixed rate for the life of the new loan
- Higher closing costs (2–5% of the new loan amount)
- Loan term resets — typically 15 or 30 years from the new closing date
How a HELOC works
For a complete deep-dive on HELOCs — including how rates work, the math over 30 years, payment shock, and the lender freeze risk — see our Complete HELOC Guide.
A HELOC (home equity line of credit) is a separate, second loan on your home. Your existing mortgage stays exactly as it is. The HELOC is a credit line you can draw from as needed, similar to a credit card secured by your home.
If you owe $250,000 on a home worth $500,000, you might be approved for a $100,000 HELOC. You're not borrowing $100,000 yet — you're approved to borrow up to that amount over a defined period (typically 10 years, called the "draw period"). You pay interest only on what you actually borrow.
Key features:
- Doesn't touch your existing mortgage — it's a separate second loan
- Revolving credit line — draw, pay back, draw again, all during the draw period
- Usually variable rate — tied to a benchmark like the prime rate, can change monthly
- Low or no closing costs in many cases
- Two phases: a draw period (typically 10 years, interest-only payments allowed) followed by a repayment period (typically 10–20 years, principal and interest)
A cash-out refinance is one big new loan that replaces your existing mortgage. A HELOC is a second, smaller loan that sits on top of your existing mortgage, leaving it untouched. This single difference drives most of the choice between them.
Side-by-side comparison
| Feature | Cash-Out Refinance | HELOC |
|---|---|---|
| Touches existing mortgage? | Yes — replaces it | No — second loan |
| Disbursement | Lump sum at closing | Draw as needed during draw period |
| Interest rate type | Usually fixed | Usually variable |
| Typical rate (current environment) | ~7.0–7.5% | ~8.5–10% (prime + margin) |
| Interest charged on | Full lump sum from day one | Only the amount you've drawn |
| Closing costs | 2–5% of loan amount | $0 to ~$500 typical |
| Time to close | 30–45 days | 2–4 weeks |
| Loan term | 15 or 30 year fixed | 10-yr draw + 10–20 yr repay |
| Best for | Large lump sum, current rate is similar to existing rate | Flexible borrowing, existing mortgage rate is good |
| Risk | Locks you into today's rate; resets your loan term | Rate can rise; payment shock when repayment period starts |
The math: which costs more?
Let's look at a real example. Imagine you have a home worth $600,000 and an existing mortgage balance of $300,000 at 3.5% (locked in 2021), with about 25 years remaining. You need to pull out $80,000 for a kitchen renovation.
Option A: Cash-out refinance at 7.0%
You replace your $300,000 mortgage with a new $385,000 mortgage at 7.0%, 30-year fixed. Closing costs of ~$5,000 are added to the new loan.
Cash-out refinance: monthly cost
Option B: Keep existing mortgage + take an $80,000 HELOC at 9%
Your existing $300,000 mortgage at 3.5% stays exactly as it was. You add a separate $80,000 HELOC at 9%. We'll assume you draw the full $80,000 immediately and make interest-only payments during the draw period.
HELOC + existing mortgage: monthly cost
The HELOC saves $460 per month — despite having a higher rate on the smaller loan. That's because the cash-out refinance forces you to give up your 3.5% rate on the entire $300,000 balance and pay 7% on it instead.
Over 10 years (the typical HELOC draw period), the difference compounds:
- Cash-out refi total cost over 10 years: ~$307,000 in payments, with $173,000 going to interest
- HELOC + existing mortgage over 10 years: ~$252,000 in payments, with $112,000 going to interest
- Difference: The HELOC strategy saves about $61,000 in interest over the decade
That $600/month HELOC payment is interest-only. When the draw period ends (typically year 10), you start having to pay back the principal too — and that payment can roughly double overnight. If you don't have a plan to pay down the balance during the draw period or refinance the HELOC into a fixed loan before the repayment period starts, you'll face payment shock.
Common scenarios — which one wins?
You have a 3% mortgage from 2021 and need $50k for a renovation
Your existing rate is far below current rates. Refinancing means giving up that low rate on your entire balance — almost never a good trade for a mid-sized cash need.
HELOC winsYou have a 7% mortgage and need $150k for a major renovation
Your existing rate is roughly equal to current rates. Refinancing into a single large loan at a similar rate consolidates everything and locks in a fixed payment.
Cash-out refi winsYou're funding a renovation in stages over 18 months
You don't know exactly how much you'll need. With a HELOC, you only borrow (and pay interest) on what you actually use. A cash-out refi forces you to take everything at once.
HELOC winsYou're consolidating $80k of credit card debt and your existing rate is 6.75%
Existing rate is close to current rates, you need a single defined amount, and you want a predictable fixed payment. Cash-out refi locks everything in.
Cash-out refi winsYou want an emergency fund "just in case" but might never use it
A HELOC is a credit line — if you don't draw, you don't pay interest. A cash-out refi forces you to take cash you may never need and pay interest on it from day one.
HELOC winsYou're worried about rates rising further and want certainty
Cash-out refis are usually fixed-rate. HELOCs are usually variable. If rate certainty matters more than flexibility, refinancing locks in today's rate.
Cash-out refi winsQualification requirements
Both products have similar qualification requirements, with some differences:
| Requirement | Cash-Out Refinance | HELOC |
|---|---|---|
| Minimum credit score | 620 (conventional) | 620–680 typical |
| Maximum LTV (incl. existing mortgage) | 80% | 85% (some lenders go to 90%) |
| Maximum DTI | ~50% | ~43–50% |
| Income documentation | 2 yrs W-2s + paystubs | Same; sometimes lighter |
| Appraisal required? | Yes, full | Yes; sometimes a desktop appraisal |
| Time to close | 30–45 days | 2–4 weeks |
HELOCs are often slightly easier to qualify for and can sometimes go to 90% combined LTV (CLTV) compared to a cash-out refi's typical 80% cap. If you're tight on equity, a HELOC may be the only option.
Common mistakes
Refinancing a low-rate mortgage just to get cash
This is the single most common — and most expensive — mistake. If you have a sub-4% mortgage from 2020-2021, refinancing into a 7%+ loan to pull out cash will usually cost you more in extra interest than the cash itself is worth. Use a HELOC instead.
Treating a HELOC like free money during the draw period
Interest-only payments make HELOCs feel cheap. They're not — they're just deferring the principal. If you borrow $80,000 and only make interest-only payments for 10 years, you still owe $80,000 at the end of the draw period. Make principal payments along the way, or have a clear plan for the repayment phase.
Ignoring HELOC rate variability
Most HELOCs have variable rates that move with the prime rate. If rates rise 1.5% during your draw period, your monthly payment could jump significantly. Some lenders offer fixed-rate conversion options on HELOCs — a way to lock in a portion at a fixed rate — which can mitigate this.
Forgetting about closing costs in the math
Cash-out refinance closing costs (2–5% of the loan) can dramatically change the comparison. A "lower-rate" refinance isn't actually lower-cost if you're paying $12,000 in fees to capture a 0.5% rate improvement.
Treating the home as a piggy bank
Both products turn home equity into cash — but home equity is wealth that compounds (your home gains value, your mortgage balance shrinks). Pulling cash out resets that compounding. For consumer spending or non-productive uses, the long-term cost is usually higher than people expect.
A framework for deciding
Walk through these questions in order. The answers point you to the right product:
1. What's the spread between your existing mortgage rate and today's rates?
- Existing rate is 2+ points below today's rates → HELOC almost always wins
- Existing rate is similar to today's rates → Either could work; weigh other factors
- Existing rate is higher than today's rates → Cash-out refi probably wins (you save on rate AND get cash)
2. Do you need a single defined amount or flexibility over time?
- Single defined amount, all at once → Cash-out refi is built for this
- Flexibility, draw as needed → HELOC is built for this
3. How important is payment certainty?
- Want a fixed payment for the life of the loan → Cash-out refi (fixed rate)
- Comfortable with variable payments → HELOC works
4. How long will you keep the home?
- Less than 3 years → HELOC (low closing costs); refi closing costs may not break even
- 3+ years → Either, based on rate spread
5. Do you have a clear plan for repayment?
- Yes, you'll pay it back in 5–10 years → Either works
- You want to spread it across 30 years → Cash-out refi gives you that structure built-in. With a HELOC you'll need to actively manage the repayment phase.