A Credit Card With Your House Attached
A HELOC is a revolving credit line secured by your home equity. The lender approves a limit, and during the draw period you borrow what you want, when you want, pay it back, and borrow again. The Consumer Financial Protection Bureau calls it an open-end line where repayment refills your available credit, like a credit card.
That comparison is useful and dangerous in equal measure. Useful, because the mechanics really do work that way. Dangerous, because no credit card can foreclose on your house. A HELOC can. The CFPB says it plainly: fall behind on payments and you could lose your home.
Hold both ideas at once and a HELOC becomes what it really is: one of the cheapest ways for a homeowner to borrow, wrapped around one of the most expensive possible failure modes.
The Two Phases, and the Cliff Between Them
Every HELOC has two acts.
The draw period, often around 10 years per the CFPB’s HELOC booklet. You can borrow up to your limit, and many lenders let you pay interest only. The payments feel light. That is by design.
The repayment period, often 10 to 20 years. The borrowing window shuts, and now you pay back principal plus interest on whatever you owe. The CFPB warns that monthly payments often jump sharply in this phase.
The cliff between the two acts is where HELOCs hurt people. A borrower carries a large balance for a decade making interest-only payments, the draw period ends, and the bill jumps. The bank’s bet is that you treated the minimum as the price. Beat the bet: pay principal during the draw period, or at least know your repayment-phase payment before you borrow, not when the first big bill lands.
Some HELOCs instead end the draw period with a balloon, the whole balance due at once. Find out which kind you are signing. It is in the disclosure, and the CFPB booklet shows where to look.
Variable Rates: Your Payment Can Move
Most HELOCs carry variable rates tied to a market index, so the rate you start with is not a promise. When the index rises, your payment follows. Check three things in the agreement before signing: the margin added to the index, the rate cap, and whether the lender offers a fixed-rate lock on parts of your balance. That conversion feature turns a chunk of HELOC debt into a predictable installment loan, useful when you have drawn for something big.
If you want a fixed rate and fixed payment from the start, stop and read our home equity loan guide instead. Known expense, lump sum, fixed payment: that is the loan. Ongoing or uncertain expenses: that is the line.
The Tax Footnote, Corrected
HELOC interest is deductible only when the draw buys, builds, or substantially improves the home securing the line, per IRS Publication 936, and only for itemizers, with a $750,000 cap on total eligible home loan debt ($375,000 married filing separately). A HELOC used for a kitchen remodel can qualify. The same HELOC used to clear credit cards cannot. Anyone selling you a HELOC on “and it’s tax-deductible!” without asking what the money is for is reciting an ad, not a fact.
Good Uses, Bad Uses
Where a HELOC shines: a renovation paid in stages, where you draw as invoices land instead of borrowing the whole budget on day one. An emergency credit line you open while employed and rarely touch. Bridging a short, known gap.
Where it goes wrong: funding everyday overspend, a vacation, or anything that will be long gone before the balance is. Rolling card debt onto the house and then re-running the cards. Borrowing against equity for things with no lasting value turns spending mistakes into foreclosure risk. Not worth it.
Do This Next
Get HELOC quotes from at least three lenders, credit unions included. Pricing and fees scatter widely. Compare the margin over the index, rate caps, annual fees, draw period length, and what the repayment-phase payment looks like on a full balance. Ask each lender for that worst-case number in writing.
Then sanity-check the payment against your budget with our mortgage calculator, weigh the alternatives in our refinancing guide, and see every way to borrow against a home at the mortgages hub.