You need $80,000 for a renovation and you have the equity. A cash-out refinance replaces your entire mortgage to release it. A home equity line leaves your mortgage alone and adds a second loan behind it. If your current rate is 3.5% and today’s is 6.55%, that distinction is worth several hundred dollars a month.
You’ll learn how each product works, the one question that usually settles the choice, and what the variable rate on a HELOC actually exposes you to.
Two Different Structures
A cash-out refinance pays off your existing mortgage and replaces it with a larger one, giving you the difference in cash. You end with one loan at one rate — today’s rate, applied to the entire balance.
A home equity line of credit sits behind your existing mortgage as a second lien. Your first mortgage is untouched. You draw against the line as needed during a draw period, then repay over a repayment period.
| Cash-out refinance | HELOC | |
|---|---|---|
| Effect on first mortgage | Replaces it | Leaves it in place |
| Rate type | Usually fixed | Usually variable |
| Rate applies to | The whole balance | Only what you draw |
| Closing costs | 2%–5% of the new loan | Low or none |
| Access to funds | Lump sum at closing | Draw as needed |
| Typical equity retained | 20% commonly required | Varies; often 15%–20% |
The Calculation That Usually Decides It
Suppose you owe $300,000 at 3.5% and want $80,000.
Cash-out refinance: a new $380,000 loan at today’s rate. Every dollar of the original $300,000 is repriced from 3.5% to 6.55%. You are not paying market rate on the $80,000 you needed — you are paying it on $380,000.
HELOC: the $300,000 stays at 3.5%. Only the $80,000 carries a new rate, and HELOC rates are typically higher than first-mortgage rates. But a higher rate on $80,000 is usually far cheaper than a moderately higher rate on $380,000.
That comparison is why the HELOC generally wins whenever your existing rate is meaningfully below market. Model both against your own balance in our refinance calculator, and work out the break-even month on the refinance option before assuming it pays.
When the Refinance Is the Right Answer
Your existing rate is at or above market. If you hold a 7.5% loan and current pricing is lower, repricing the whole balance is an advantage rather than a cost. Here the cash-out is doing two useful jobs at once.
You want a fixed payment. HELOC rates are usually variable, so the payment moves with the index. A borrower who needs certainty for a decade may reasonably pay for it.
You are consolidating higher-rate debt. Replacing credit-card balances at much higher rates can justify repricing the mortgage — though this converts unsecured debt into debt secured by your home, which is a genuine increase in risk, not just a lower rate.
You want to remove mortgage insurance simultaneously. If you hold an FHA loan with permanent mortgage insurance and have reached 20% equity, one transaction can release cash and eliminate the premium — see our comparison of PMI and FHA mortgage insurance.
What the Variable Rate Actually Means
HELOC rates typically track the prime rate, which moves with the Federal Reserve’s benchmark. This is one of the few places where a Fed decision genuinely does change your payment directly — unlike your 30-year mortgage, which follows long-term yields instead, as our explainer on why Fed cuts don’t lower mortgage rates sets out.
The structural detail people underweight is the transition from draw period to repayment period. During the draw period, often ten years, many HELOCs allow interest-only payments. When it ends, the balance amortises over the remaining term — and the payment can jump sharply. Ask for the payment at the start of the repayment period before you sign, not the payment during the draw.
Also confirm whether the lender can freeze or reduce the line. Many agreements permit it if property values fall or your credit changes, which means an undrawn HELOC is not a guaranteed reserve.
A Third Option Worth Naming
A home equity loan — a fixed-rate second mortgage taken as a lump sum — sits between the two. Your first mortgage stays intact, and unlike a HELOC the rate is fixed. It suits a borrower with a known one-time cost who wants certainty and wants to keep a low first-mortgage rate.
The trade-off is flexibility: you borrow the whole amount at once and pay interest on all of it from day one, whereas a HELOC charges only on what you draw. For a renovation with staged costs, that difference matters. Check where first-mortgage pricing sits today on our daily rates page as your reference point for all three.
The bottom line
- A cash-out refinance reprices your entire balance at today’s rate; a HELOC leaves your first mortgage untouched.
- If your existing rate is well below market, a higher rate on the amount borrowed usually beats a new rate on everything.
- HELOC rates are typically variable and track prime, so Fed moves affect them directly.
- Ask what the payment becomes when the draw period ends — it can rise sharply.
- A fixed-rate home equity loan is the middle option: keeps your first mortgage, fixed payment, lump sum only.
Frequently Asked Questions
Is a HELOC better than a cash-out refinance?
It usually is when your existing mortgage rate is well below current rates, because a cash-out refinance reprices your whole balance while a HELOC only charges a new rate on what you borrow.
How much equity do I need?
Lenders commonly require you to retain around 20% equity after the transaction, though requirements vary by lender and product.
Are HELOC rates fixed?
Usually not. Most are variable and track the prime rate, so payments move when the Federal Reserve changes its benchmark. Some lenders offer a fixed-rate conversion on part of the balance.
What happens when the HELOC draw period ends?
The balance moves into a repayment period and amortises over the remaining term. If you were making interest-only payments during the draw, the payment can rise substantially.
Sources & further reading:
Consumer Financial Protection Bureau,
30-year conforming rate lock index via FRED.
