What Is a HELOC? The Lender's Side of a Home Equity Line

A HELOC — home equity line of credit — is a revolving credit line secured by your home's equity. That one fact explains everything else on this page. The house is why the rate beats a credit card's by so much. The house is also what is at risk if you cannot pay. Lenders are not being generous when they price a HELOC cheaply; they are being covered. This guide reads the product from the lender's side: how the price is set, what it really costs, and which clauses matter before you sign.

How the price is set: index plus margin

Most HELOCs carry a variable rate quoted as an index plus a margin. The index is usually the prime rate, which moves with the wider economy and is the same for every borrower. The margin is the lender's addition on top, and it is set by your credit profile and the loan-to-value of the line. This page deliberately quotes no current prime value — it moves, and any page that prints one is dating itself.

The structure tells you where your leverage is. You cannot negotiate the index. You can shop the margin: the same house, the same borrower and the same draw can price differently at two lenders, because the margin is each lender's own number. Comparing HELOC offers means comparing margins (and fees, below) — not comparing the headline rate on the day you happen to apply, since both will float from there.

The two phases, cost framing only

A HELOC runs in two phases. In the draw period, you can borrow, repay and re-borrow, and the required minimum payment is typically interest only. In the repayment period, the line closes to new draws and the remaining balance amortizes like a regular loan. The cost-relevant fact about the draw phase is this: an interest-only minimum is designed to keep the line open and performing, not to retire it. Years of minimum payments can leave the balance exactly where it started, with the larger amortizing payment still ahead of you.

The costs, in numbers

These are the default figures in our HELOC Calculator: $20,000 drawn at 8% APR, a 5-year draw and a 10-year repayment.

And the variable-rate exposure, in one line: each additional point of APR on $20,000 drawn adds $16.67 a month during the draw — before the repayment phase reprices upward as well. When you collect real offers, re-run the HELOC Calculator at each lender's prime-plus-margin rate; it prices both phases and the effect of extra principal, which is the only honest way to compare lines whose rates will all move anyway.

One more lender-side term belongs in any comparison: how the repayment phase is triggered if you are still drawing near the end of the draw period, and whether the lender allows interest-only payments to convert early. Two lines with identical margins can differ by thousands purely on how the second phase is set up.

The costs beyond interest

• Closing costs. Many lines charge them; they run from nothing to a few percent of the line depending on the lender — treat any specific figure as that lender's, not the product's, and get it in writing.
• Annual fees. Some lines charge a yearly fee simply for existing, drawn or not.
• Inactivity and early-closure fees. Some agreements charge you for not using the line, or for closing it within the first few years — a nasty surprise if you open a line "just in case" and close it unused.
• Rate caps and floors. Where they exist, they are in the agreement, not the advertisement. A floor matters as much as a cap: it limits how far your rate can fall.

The rule for all four: the agreement lists them, the advertisement doesn't. Read the fee schedule of the actual line you are offered before comparing it with anything.

The clauses that surprise people

Your line can be frozen or reduced. Under the standard federal framework for home equity lines, a lender may freeze or cut your line if the home's value falls materially, or if your financial circumstances change significantly. This is not fine-print mischief; it is a standard, disclosed term of the product — which means a HELOC is least reliable exactly when falling house prices make you want it most. Never build a plan that assumes the full line will be there in a downturn.

Today's payment is not a promise. Because the rate floats, the payment you qualify with is a snapshot. Qualifying comfortably at the introductory figure and struggling two points higher is the classic HELOC failure mode; the sensitivity line above — $16.67 a month per point per $20,000 — is how you stress-test it in one step.

The honest comparison frame

A HELOC sits between two relatives, and the three are different risk shapes for different jobs. A home equity loan is a fixed rate and a lump sum, amortizing from day one: no flexibility, no payment surprise, the house equally at stake — price one properly, fees counted, with the APR Calculator. Unsecured credit — cards, personal loans — charges far higher rates but puts no house behind the debt: the lender's risk is priced in money instead of collateral. A HELOC is the right shape for staged, uncertain borrowing (a renovation drawn in tranches, a bridging need) by a borrower who has priced the repayment phase at a higher rate and read the freeze clause. For a single known expense with a fixed payoff date, the boring fixed loan usually wins. If a first mortgage is part of your picture at all, the Mortgage Calculator covers that side of the balance sheet.