HELOC vs Cash-Out Refinance: Which Is Cheaper for Tapping Equity?

Homeowners with substantial equity have two primary ways to convert that equity into cash: cash-out refinance and home equity line of credit (HELOC). The products look similar on the surface (both let you borrow against your home), but they work very differently and have very different cost structures. Which one is cheaper depends on three specific factors: how much cash you need, how long you'll hold the debt, and what your current mortgage rate is.

What each product actually is

Cash-out refinance: You replace your existing mortgage with a larger new mortgage. The difference between the new loan amount and your existing payoff is cash to you. New rate, new term (usually 30 years), single monthly payment. Closing costs typical of any mortgage: 2–5% of the loan amount.

HELOC (Home Equity Line of Credit): A second mortgage in the form of a revolving credit line. You're approved for a credit limit (typically up to 80–85% combined LTV) and draw funds as needed. You pay interest only on what you've drawn. Variable rate tied to Prime + margin. Two payments going forward: your existing first mortgage AND the HELOC payment.

When cash-out refi wins

1. You need a large lump sum. $100K+ cash needs are usually cheaper through cash-out refi because the rate (even with the cash-out premium) is typically 2–4 points below HELOC rates.
2. You'll keep the home long-term (7+ years). The longer you hold, the more the fixed lower rate compounds value.
3. Your current mortgage rate is at or above current market rates. If your existing mortgage is at 7% and cash-out refi rates are 6.875%, you save on the existing balance too — making the math much more favorable.
4. You want payment certainty. Cash-out refi rate is fixed for the life of the loan. HELOC rate can rise significantly.

When HELOC wins

1. You have a low existing first-mortgage rate. If you're at 3.5% from a 2020 refi and current cash-out rates are 7%, replacing the whole mortgage destroys that rate advantage. The HELOC layered on top preserves the 3.5% on your existing balance.
2. You need flexible or staged cash. Home renovation that will spend over 12 months, college tuition over 4 years, business capital cycles — HELOC lets you draw only what you need when you need it. You don't pay interest on undrawn amounts.
3. You'll repay quickly (3–5 years). Lower closing costs mean break-even is faster. The variable-rate risk is limited if you're paying off quickly.
4. You want to keep the option open. A HELOC can stay open for 10 years (draw period) with minimal carrying cost if undrawn. Useful as financial flexibility.

Worked example: $75K need, low existing rate

Scenario: Home worth $700K. Existing mortgage balance $350K at 3.25% (locked in 2020). You need $75K for a major kitchen renovation.

• Cash-out refi option: New mortgage $425K at 7.0% (cash-out rate). New monthly P&I: $2,827. Closing costs: $10,000. Old monthly P&I was $1,523.
• Monthly payment increase: +$1,304.
• HELOC option: $75K HELOC at 9.0% (current Prime + 0.5%). Interest-only minimum payment during 10-year draw period: $562. (Principal repayment recommended; $1,000/month covers principal + interest in 7 years.)
• Existing mortgage unchanged: Still $1,523 at 3.25%.
• Total monthly with HELOC at $1,000/month payment: $1,523 + $1,000 = $2,523.

HELOC wins by $300/month in this scenario despite the higher HELOC rate, because the cash-out refi destroys the 3.25% rate on the existing $350K balance. Over 10 years: HELOC saves roughly $40K in lifetime cost.

Worked example: $200K need, similar rates

Scenario: Home worth $800K. Existing mortgage $250K at 6.875% (2025 origination). You need $200K for a major addition.

• Cash-out refi: New $450K mortgage at 7.0% (cash-out premium adds 0.125%). Monthly P&I: $2,994. Closing costs: $11,000.
• HELOC option: $200K HELOC at 9% (variable). Existing $250K at 6.875% stays. Monthly cost: existing $1,641 + HELOC P&I if amortizing $200K over 20 years = $1,800 = $3,441 total.

Cash-out refi wins here by ~$450/month because the existing mortgage rate is similar to today's market — there's no rate advantage to preserve.

Worked example: $40K need, flexible draw

Scenario: Home worth $500K. Existing mortgage $200K at 4.5%. You need $40K for a phased home improvement spread over 18 months.

• Cash-out refi: Take the full $40K at closing whether you need it yet or not. Pay interest on full $40K from day 1. New mortgage $240K at 7%. Closing costs $7,000.
• HELOC: Approved for $80K line. Draw $10K, $15K, $10K, $5K over 18 months as needed. Pay interest only on outstanding balance each month. Closing costs $0–$500. Existing mortgage at 4.5% unchanged.

HELOC dramatically wins here. The flexibility of staged draws means you don't pay interest on capital you haven't yet deployed, and you preserve the 4.5% rate on the existing mortgage.

The rate-risk consideration with HELOC

HELOC rates are variable — typically Prime + a margin. If Prime is 8.5% and your margin is 0.5%, your rate is 9%. If the Fed raises rates 2 percentage points over the next 18 months, your HELOC rate becomes 11% and your payment rises proportionally.

This is the major risk that cash-out refi avoids. The fixed rate on a cash-out refi protects you for the life of the loan. Whether this matters depends on:

• How long you'll hold the debt. Repaying in 2 years? Limited rate-risk exposure. Carrying for 10 years? Significant exposure.
• The rate environment. If we're at a cyclical rate peak with rates expected to fall, HELOC variable risk works in your favor. If we're at a low expecting rises, fixed-rate cash-out is safer.
• Your financial cushion. Can you absorb a 2-percentage-point payment increase if rates rise? If yes, HELOC variable risk is acceptable. If a payment rise would create strain, fixed is safer.

Decision framework

Quick decision rules:

• Existing rate < 5% and you need cash? HELOC almost always wins. Don't blow up the existing low rate.
• Existing rate > 6.5% and current market rates similar or lower? Cash-out refi probably wins because you save on the existing balance too.
• Need cash in stages over 12+ months? HELOC for the flexibility.
• Need lump sum, fixed payment, long-term? Cash-out refi.
• Worried about rate increases? Cash-out refi locks the rate.
• Repaying within 3–5 years? HELOC — lower closing costs make break-even fast.

Get loan estimates from at least three lenders for both products before deciding. Most loan comparison marketplaces return both cash-out refi and HELOC offers in the same search, making side-by-side comparison straightforward. The right answer is highly specific to your numbers — there's no universal "better" product between these two.