The short answer
- A HELOC leaves your existing first mortgage untouched and adds a revolving second lien you draw from as needed. Rates are usually variable, upfront costs are typically lower, and you pay interest only on what you draw.
- A cash-out refinance replaces your first mortgage with a larger loan and hands you the difference as a lump sum. Rates are commonly fixed, closing costs are typically higher, and the whole balance starts accruing interest immediately.
If your current mortgage rate is well below today's rates, refinancing the whole balance to reach equity is often expensive. If you need one large, known amount and want a fixed payment, a cash-out refinance may fit better. Model both with the HELOC Calculator and the Cash-Out Refinance Calculator.
What a HELOC is
A home equity line of credit is revolving credit secured by your home, usually recorded as a second lien behind your existing mortgage.
- Draw period: a set number of years in which you can borrow, repay and re-borrow. Payments during this period are often interest-only on the drawn balance.
- Repayment period: after the draw period, the outstanding balance amortizes over the remaining term, and the payment generally increases.
- Rate: typically variable, tied to an index such as the prime rate plus a margin, subject to any caps in the agreement.
- Cost: you owe interest only on what you have drawn, not the full line.
What a cash-out refinance is
A cash-out refinance pays off your current mortgage with a new, larger first mortgage. The difference — minus closing costs — comes to you at closing.
- Rate: commonly fixed for the full term, so the payment is predictable.
- Cost: standard mortgage closing costs, often several percent of the new loan amount.
- Term: resets, which can reduce the payment but extend how long you carry mortgage debt.
- Trade-off: your entire mortgage balance is repriced at today's rate, not just the cash you take out.
Both are secured by your home
This is the point that matters most. Home equity borrowing is not unsecured credit. The Consumer Financial Protection Bureau notes that if you cannot make payments on a loan secured by your home, you risk foreclosure. That risk is the same for both products, and it is the reason equity borrowing deserves more scrutiny than a credit card decision.
How much equity is available
Lenders work from a combined loan-to-value (CLTV) limit, commonly around 80% of appraised value, though limits vary.
Maximum borrowing = (home value x CLTV limit) - existing mortgage balance
Example: a $400,000 home at an 80% limit supports $320,000 of total secured debt. With a $220,000 mortgage balance, roughly $100,000 of equity may be accessible, subject to underwriting.
Side-by-side comparison
| Factor | HELOC | Cash-out refinance |
|---|---|---|
| Lien position | Usually second | Replaces the first mortgage |
| Access to funds | Revolving draws as needed | One lump sum at closing |
| Rate structure | Usually variable | Commonly fixed |
| Effect on existing mortgage | None | Entire balance repriced |
| Upfront costs | Typically lower | Typical mortgage closing costs |
| Payment during early years | Often interest-only on draws | Full principal and interest |
| Payment shock risk | At end of draw period | Low if fixed-rate |
| Interest charged on | Only what you draw | Full new loan balance |
| Best suited to | Staged or uncertain costs | One large, known cost |
| Shared risk | Home is collateral | Home is collateral |
A worked U.S. example
A homeowner's property is appraised at $400,000. The existing mortgage balance is $220,000 at 5.5% with about 25 years remaining, a payment of roughly $1,351 in principal and interest. They want $100,000 for a renovation. Assume an 80% CLTV limit.
Option A — HELOC of $100,000 at 8.5% variable Keep the 5.5% first mortgage at about $1,351. Interest-only on a fully drawn $100,000 line is roughly $708 a month, so about $2,059 combined. When the line amortizes over 20 years, the HELOC payment rises to about $868, or roughly $2,219 combined. Because the rate is variable, these figures move with the index.
Option B — cash-out refinance to $320,000 at 7.25% for 30 years The new payment is about $2,183 in principal and interest, fixed. Closing costs at 2%–5% of the new loan would be roughly $6,400–$16,000, and the 5.5% rate on the original $220,000 is gone.
The payments land close together, but the structures differ sharply: Option A keeps a cheap first mortgage and accepts rate variability, Option B buys payment certainty and pays for it by repricing the whole balance. Rates shown are illustrative, not quotes; your pricing depends on credit, CLTV, occupancy, property type and the market at the time you lock.
When each may be worth considering
A HELOC may fit when:
- your existing mortgage rate is well below current rates
- costs arrive in stages, as with a phased renovation
- you want the option to borrow without committing to the full amount
- you expect to repay quickly and can absorb rate movement
A cash-out refinance may fit when:
- you need one large, defined amount
- current rates are at or below your existing mortgage rate
- you want a fixed payment for the long term
- you plan to stay long enough to absorb closing costs
Situations that call for caution
- Consolidating credit cards into home equity. It lowers the rate but secures previously unsecured debt against your home.
- Interest-only comfort. A low draw-period payment can mask the balance you still owe.
- Declining home values. Falling values reduce available equity and can lead to a line being frozen or reduced, which lenders may do under the terms of the agreement.
- Variable-rate exposure without headroom. If a rate increase would strain your budget, the risk is real.
- Short ownership horizon. Closing costs on a refinance are hard to recover if you sell soon.
Neither product guarantees savings, approval or a specific rate.
Common mistakes
- Comparing only the monthly payment instead of total cost and risk.
- Forgetting the closing costs on the refinance side of the comparison.
- Overlooking the draw-to-repayment transition on a HELOC.
- Assuming interest is tax deductible — deductibility depends on how funds are used and on current IRS rules.
- Skipping the appraisal reality check; the lender's value, not your estimate, sets the limit.
Related calculators
- HELOC Calculator — line payment estimator
- Cash-Out Refinance Calculator — cash available at an 80% LTV
- Mortgage Calculator — principal, interest and amortization
- Mortgage Refinance Calculator — payment change and break-even
- Home Equity Loan Calculator — fixed lump-sum second mortgage
Related reading
- Home equity loan vs. HELOC
- How mortgage refinancing works
- Closing costs explained
- How to calculate loan payments
Sources and references
- Consumer Financial Protection Bureau, What you should know about home equity lines of credit
- Consumer Financial Protection Bureau, Cash-out refinance basics
- Internal Revenue Service, Publication 936, Home Mortgage Interest Deduction
- Federal Reserve, Selected interest rates (H.15)
This article is educational information for U.S. homeowners, not personalized financial or tax advice. Terms, limits and rates vary by lender, property and borrower.