Both are secured by your house, which is why the rates are low and why the worst case is different in kind. The HELOC's second phase is the part people miss.
Start with what is at stake
Both products are secured by your home. That is why the rates are lower than credit cards or personal loans — and it is why the consequences of trouble are categorically different.
Miss payments on an unsecured debt and you damage your credit. Miss payments on these and the lender can ultimately foreclose. Converting unsecured debt into home-secured debt lowers your interest rate and raises your worst case, and that trade should be made deliberately rather than because the rate looked attractive.
The two products
Home equity loan
A lump sum, a fixed rate, fixed payments over a fixed term. It behaves exactly like a second mortgage, because that is what it is.
Suits a known, one-off cost: a specific renovation with a quote, a defined debt to clear. You know the payment on day one and it never moves.
HELOC
A revolving line you draw from as needed, like a credit card secured by your house. Rates are typically variable.
It has two phases, and the second one surprises people. During the draw period — often ten years — you can borrow and repay, and payments may be interest-only. When it ends, the repayment period begins: no more drawing, and you now amortise the balance over a shorter remaining term. Payments can jump sharply.
A HELOC quoted at an affordable monthly figure during the draw period is showing you interest alone. The balance is not reducing. Work out what the payment becomes when principal is added over the repayment term, at a rate higher than today's — because it is variable. If that number does not work, the product does not work.
How much you can borrow
Lenders look at combined loan-to-value: your existing mortgage plus the new borrowing, against the home's appraised value. Many cap the total somewhere around 80–85%, which means the equity available is less than the equity you have.
They will also check your debt-to-income ratio and credit, and there are closing costs — smaller than a full refinance, but not nothing.
Reasonable uses, and poor ones
Defensible: a renovation that genuinely adds value or extends the life of the house; consolidating high-rate debt if the spending that created it has actually stopped; a real emergency when the alternative is a 25% credit card.
Poor: holidays, cars, weddings, or investing the proceeds in markets. Borrowing against your home to invest means leveraging your housing to buy volatility — the maths can work and the failure mode is losing the house.
And the honest one: if you are consolidating card debt without changing what caused it, you will end up with the consolidated loan and new card balances. See why consolidation so often fails.
The alternatives to weigh first
- Cash-out refinance — replaces the whole mortgage. Worth comparing if current rates are below your existing one; usually not if they are above it, since you would reprice your entire balance.
- Personal loan — higher rate, but unsecured. For modest amounts the extra interest can be a fair price for not pledging your home.
- Doing less — the renovation in stages, paid from savings.
Before signing
Check the index and margin on a HELOC's variable rate and whether there is a lifetime cap. Ask about annual fees, inactivity fees and early closure fees. Confirm whether the lender can freeze or reduce your line — many can if home values fall or your circumstances change, which tends to happen precisely when you would want it.
Tax treatment of the interest depends on how the funds are used and has changed in recent years; check current rules rather than assuming it is deductible.
This is educational content, not advice. Terms vary widely by lender and state.