Home equity is the largest asset most households own and the cheapest borrowing they have access to. It is also the only debt where non-payment ends with losing the roof, which is why the decision deserves more rigour than "which one has the lowest advertised rate".
The three products differ on four axes: what happens to your existing mortgage, whether the rate is fixed, whether you draw once or repeatedly, and what it costs to set up.
The structural comparison
| HELOC | Home equity loan | Cash-out refinance | |
|---|---|---|---|
| Lien position | Second | Second | First — replaces existing |
| Rate type | Variable | Fixed | Fixed or variable |
| Existing mortgage rate | Untouched | Untouched | Repriced to market |
| Access | Revolving, draw as needed | Single lump sum | Single lump sum |
| Setup cost | $0–1,000, often waived | $0–2,000 | 2–5% of the new loan |
| Typical rate premium vs first mortgage | +1 to +3% | +1 to +2.5% | +0 to +0.5% |
| Payment risk | High — rate and amortisation reset | None | None if fixed |
| Best when | Timing is uncertain, staged spending | Known amount, want certainty | Current rate ≥ market rate |
The rate you already hold is an assetIf you carry a 3.5% mortgage and market is 6.5%, refinancing to extract equity reprices your entire balance three points higher. On a $300,000 balance that is roughly $9,000 a year in additional interest — to access perhaps $60,000. A second lien at 8.5% on just the $60,000 costs a fraction of that. Protecting a below-market first mortgage is usually the dominant consideration.
Model the total cost
The model below prices a HELOC across its interest-only draw period and its amortising repayment period, and compares that against the extra lifetime interest a cash-out refinance creates by repricing your existing balance.
The HELOC payment shock nobody plans for
A HELOC typically has a ten-year draw period during which you pay interest only, followed by a repayment period where the balance amortises. Both changes hit at once: the payment stops being interest-only and the remaining term is shorter than a mortgage's.
On a $70,000 balance at 8.6%, interest-only is roughly $500 a month. Once amortisation begins over 20 years, the payment rises to around $610 — and if rates have moved up two points by then, closer to $730. Borrowers who treated the draw payment as their true cost are the ones who struggle.
What each product is genuinely good for
- HELOC — staged renovation. You draw as invoices arrive and pay interest only on what is drawn. Borrowing $80,000 up front for a project that spends over eighteen months wastes interest.
- HELOC — standby liquidity. Opening a line you do not use costs little and creates a backstop. Note the caveat below.
- Home equity loan — a single known expense. A defined amount, a fixed rate, a fixed end date. The right answer for consolidating high-rate debt where certainty matters more than flexibility.
- Cash-out refinance — when your rate is already at or above market. Then there is nothing to protect, and first-lien pricing plus a single payment wins clearly.
- Funding depreciating consumption — cars, holidays, weddings — with 30-year secured debt against your home.
- Using a HELOC as your emergency fund. Lenders reduce and freeze lines precisely when the economy turns, which is when you would need it.
- Consolidating credit cards without closing them. Without a change in behaviour, you end up with the same card balances and a lien on the house.
- Refinancing a sub-4% mortgage to access equity, when a second lien would leave it intact.
Interest deductibility narrowedIn many jurisdictions, interest on home equity borrowing is only deductible where the proceeds substantially improve the property securing the loan. Using a HELOC to consolidate card debt or pay tuition typically means no deduction — so model the after-tax rate honestly rather than assuming the old "mortgage interest is deductible" rule still applies.
Decision sequence
- Compare your rate to market.If your current mortgage rate is more than roughly 0.75% below today's rates, remove cash-out refinance from consideration immediately.
- Check the LTV ceiling.Value × maximum combined LTV, minus your balance, is your real limit. The model above computes it — it is often much less than "your equity".
- Decide fixed or variable.If a 3% rate rise would break your budget, take the fixed second lien even at a higher starting rate.
- Decide lump sum or staged.Staged spending favours a HELOC; a single known cost favours a home equity loan.
- Price the exit.Ask about early closure fees, annual fees and whether the draw period can be extended. A HELOC closed within three years often triggers reimbursement of waived costs.
Limits, errors and borders of the standard advice
Critical reviewHome-equity borrowing is marketed by lenders as access to money you already own. That framing is the error the entire category is built on, and most comparison content inherits it.
"Tap your home equity — it's your money."
The claimEquity is an asset you have built, so borrowing against it is accessing your own wealth.
Where it breaksYou are not accessing money, you are taking on debt secured against your home — the equity is unchanged and the liability is new. The framing makes a mortgage feel like a withdrawal, which reliably encourages borrowing for consumption. It also obscures the risk transfer: unsecured borrowing risks your credit record, while this risks the roof. And because equity is a function of a market price you do not control, the "asset" you are borrowing against can shrink while the debt cannot.
The borderBorrowing against a home is a reasonable tool for something that creates durable value or reduces total interest — a repair that prevents larger damage, or refinancing genuinely punitive debt with a plan. Judge every use by whether you would take the same loan if it were secured on nothing.
"A HELOC is the flexible option — only pay for what you use."
The claimA revolving line gives access without committing to a full loan.
Where it breaksThe flexibility is real and the terms are asymmetric. Rates are usually variable, so the payment can rise substantially after you have drawn — the borrower carries the rate risk that a fixed loan places on the lender. Many lines are interest-only during the draw period and then convert to full amortisation, producing a step change in the payment that surprises people years later. Lenders also retain the right to reduce or freeze the line, and they exercise it when property values fall or your credit weakens, which is exactly when you would want it. Easy repeated access also makes revolving balances more likely than a term loan does.
The borderA line is well suited to staged, uncertain spending — a renovation with unknown scope — or as a standby facility you do not draw. For a known lump sum you intend to repay over years, a fixed-rate loan removes the rate risk and the payment-shock cliff.
"Home equity interest is tax-deductible."
The claimDeductibility makes home-equity borrowing cheaper than other debt.
Where it breaksFrequently repeated long after the rules narrowed, and it does not exist at all in many countries. Where it exists it is typically conditional on using the funds for the property itself, subject to overall limits, and worth something only if you itemise rather than take a standard allowance — which most households do not. So the benefit is often quoted to people who would receive none of it. Even where valid, it reduces the cost of the interest, it does not make the borrowing free.
The borderVerify against current rules and your own filing position before pricing any deduction into the decision. Treat the loan as worthwhile only at its pre-tax cost; if it only works after an assumed deduction, it probably does not work.
"Use home equity to invest — borrow cheap, earn more."
The claimIf expected investment returns exceed the borrowing rate, the spread is profit.
Where it breaksIt compares a certain cost with an uncertain return and treats the difference as income. The borrowing cost is contractual and, on a variable line, can rise; the return is a probability distribution that includes prolonged losses. The two are also correlated in the worst way — the conditions that hurt investment values also weaken employment and property prices, so the margin call arrives as a mortgage payment on a house worth less. Leverage additionally converts a temporary drawdown into a permanent loss whenever it forces a sale at the bottom.
The borderThere are narrow professional contexts where this is a considered strategy, with committed long-term funding and no forced-sale risk. For a household whose primary residence is the collateral and whose income depends on the same economy, the expected spread does not compensate for the ruin scenario.
We are consistently discouraging, which is the right default and will be wrong for readers with substantial equity, secure income and a genuinely productive use — for them our caution costs real money. We also publish no rates or margins, so the comparisons we recommend need current quotes. And the tax and product landscape here is highly jurisdiction-specific: some markets have no equivalent of a revolving home-equity line at all, which makes part of this comparison inapplicable.
Frequently asked questions
Does opening a HELOC hurt my credit score?
The application creates a hard inquiry and the new account slightly lowers average account age. The larger effect depends on how the line is reported: some bureaus treat a drawn HELOC as revolving utilisation, which can move a score meaningfully. See the utilisation timing mechanics.
Can the lender reduce my line after approval?
Yes. HELOC agreements generally permit suspension or reduction if property values fall or your financial position deteriorates. This happened at scale in 2008–09 and is the core reason a HELOC is not a cash reserve.
Is a HELOC good for paying off a mortgage faster?
Strategies that cycle income through a HELOC to reduce average balance can work arithmetically but depend on discipline and a variable rate staying favourable. Extra principal payments achieve most of the benefit with none of the risk — see the amortisation calculator.
What about a HELOC on a rental property?
Available but priced higher, with lower LTV limits and stricter documentation. Confirm the payment still clears your DSCR after the draw period converts to amortising.
The bottom line
Start with your existing rate. A below-market first mortgage is worth protecting, which points to a second lien — HELOC for staged and uncertain spending, home equity loan for a fixed known amount. Only refinance out of your first mortgage when its rate is no longer an advantage. And underwrite the HELOC at its post-reset amortising payment, not the interest-only figure the brochure leads with.
Revision log. Jul 2026: added the total-cost comparison model including draw-period interest and first-mortgage repricing. Reviewed twice yearly.