Using a HELOC to pay off credit cards: cheap rate, expensive mistake?

On paper, using a home equity line of credit to wipe out credit card debt is the smartest arbitrage in consumer finance: swap 24% unsecured interest for 8–10% secured interest and save thousands. What the paper doesn't show is that you've fundamentally changed what happens if you can't pay. Credit card default means collections calls and a wrecked score. HELOC default means foreclosure. You're not just lowering the rate — you're re-collateralizing the debt with your house.

How the trade works

A HELOC is a revolving credit line secured by your home equity, typically letting you borrow up to 80–85% of your home's value minus your mortgage balance. Rates are variable — usually prime plus a margin — and the structure has two phases: a draw period (often 10 years) where you can borrow and pay interest-only, followed by a repayment period (often 20 years) where principal comes due. A home equity loan is the fixed-rate, lump-sum cousin; everything here applies to both.

Those bars explain both the appeal and the sales pressure. But look at the gap between the personal loan and the HELOC: roughly $2,500 over four years — about $50 a month. That's the true price of keeping your house out of it. For a borrower whose credit qualifies for a decent unsecured rate, paying that $50/month premium to keep the debt unsecured, fixed-rate, and dischargeable is often the best insurance policy they'll never think of as insurance.

The four ways it goes wrong

• The refill: you pay off the cards, feel free, and run the balances back up. Now you owe the cards AND the HELOC — this is the classic outcome, not a rare one.
• The rate is variable: a HELOC priced at 8.5% can be 11% two years later. Your 'cheap' debt reprices with every Fed move.
• Interest-only drift: minimum payments during the draw period often cover only interest. Ten years later the principal is fully intact and the required payment jumps hard.
• The stakes change: unsecured card debt can be settled, discharged in bankruptcy, or simply outlasted. Debt attached to your house forecloses.

When it actually makes sense

1. The debt came from a one-time event — medical bills, divorce, a layoff you've recovered from — not from ongoing overspending.
2. Your budget now runs a genuine monthly surplus that can retire the HELOC in 3–5 years, not drift on interest-only minimums.
3. You have stable income, and payments fit comfortably even if the rate rises 3 points.
4. You close or freeze the paid-off cards the same week, keeping one for emergencies at a zero balance.
5. You've compared it against a fixed-rate personal loan — if your credit gets you 11–13% unsecured, the small rate gap may not be worth mortgaging the escape hatch.

If you do it, do it like this

Borrow only the payoff amount, not the full line you qualify for. Set the payment yourself — balance divided by 48 or 60 months — and automate it, ignoring the interest-only minimum entirely. Shop at least three lenders including a credit union, watch for annual fees and prepayment penalties, and skip any lender pushing you to take extra cash out 'while you're at it.' The extra cash is how consolidation becomes a lifestyle.

The tax myth, retired

A generation of homeowners learned that home equity interest is tax-deductible, and lenders still let the impression linger. Under current law, HELOC and home equity loan interest is deductible only when the borrowed money buys, builds, or substantially improves the home securing the loan — paying off credit cards doesn't qualify, at all. And even for qualifying uses, the deduction only helps if you itemize, which most households no longer do under the enlarged standard deduction. Run your HELOC-vs-cards math at the full sticker rate with zero tax assist; if anyone in the transaction mentions the deduction as a selling point for debt consolidation, they've just told you how carefully to read the rest of their pitch.

The bottom line

A HELOC consolidation is a good deal for people who no longer have a spending problem and a dangerous one for people who still do. The rate savings are real — often five figures — but the collateral is your home and the escape routes for unsecured debt disappear the day you sign. If the debt's cause is fixed and the payoff plan is automated, take the cheap rate. If you're not sure, the fact that you're not sure is the answer.