HELOC to Pay Off Credit Card Debt: Does the Math Actually Work?
If you own a home, you've probably seen the headlines: "How much does an $80,000 home equity line of credit cost?" They never tell you to go get one. They just put the question in front of you often enough that it starts to feel like the obvious move.
Brian walks through it on video.
So let's do what nobody in those articles does: run the actual numbers. Using a HELOC to pay off credit card debt can genuinely save you thousands — or it can quietly turn unsecured debt into debt backed by your house. The difference comes down to three things, and I'll show you exactly what they are.
What a HELOC actually is
A home equity line of credit is a revolving line, like a giant credit card, secured by the equity in your home. You draw what you need, pay interest on the balance, and pay it back down. Rates are usually variable and usually much lower than credit card rates — because the bank has your house as collateral.
That last part is the whole story. Credit card debt is unsecured. If everything goes sideways, a credit card company can wreck your credit and sue you, but they can't take your home. Move that balance to a HELOC and the debt is now attached to the roof over your head.
Every financial instrument is a double-edged sword. A HELOC is one of the sharpest ones out there.
The worked example: $20,000 at 20% vs. 10%
Say you have $20,000 in credit card debt at 20% APR, and you can put $600 a month toward it.
Option A: keep it on the cards
At 20% on $20,000, the interest alone in the first year is about $4,000 — roughly $333 a month before a single dollar touches the balance. Of your $600 payment, about $267 actually reduces what you owe in month one.
Option B: move it to a HELOC at 10%
At 10% on $20,000, first-year interest is about $2,000 — roughly $167 a month. Now $433 of that same $600 payment goes to principal. You're paying down more than 60% faster out of the gate, and you keep roughly $2,000 a year that used to belong to the bank.
| Credit cards at 20% | HELOC at 10% | |
|---|---|---|
| Balance | $20,000 | $20,000 |
| Interest, month 1 | ~$333 | ~$167 |
| Principal from a $600 payment | ~$267 | ~$433 |
| Interest, first 12 months | ~$4,000 | ~$2,000 |
Option C: the version that ruins people
Same HELOC at 10%. You pay off the $20,000 in cards. Then the cards sit at zero, the limits are still there, and over the next year you drift back to $8,000 on them. Now you owe $20,000 on the HELOC and $8,000 at 20%, and your total debt is higher than when you started — except now part of it is secured by your house.
I know someone who pulled equity out, decided it was free money, and bought a $5,000 bike that was worth maybe $2,000 two weeks later. It sits in the garage. He's still paying interest on it. That's not a math problem, that's a behavior problem, and no interest rate fixes it.
The three questions to answer before you do this
1. Is the new rate meaningfully lower?
Swapping 20% for 10% is real money. Swapping 22% for 18% after fees is noise. And remember HELOC rates are usually variable — the rate you qualify for today isn't locked forever. Build a little cushion into your assumptions.
2. Is your budget already positive?
This is the one people skip. A lower rate only helps if you're not spending more than you make. If the gap in your budget is what created the $20,000, a HELOC refills the cards and you're back here in 18 months with more debt. Fix the monthly math first. If housing is eating 40% to 50% of your take-home when it should be closer to 25% or 30%, that's the problem the HELOC can't solve.
3. Can you close or freeze the cards?
You don't have to cancel every account, but you need a plan so the balances stay at zero. Cut them up, lock them in a drawer, remove them from your phone — whatever makes using them inconvenient.
If you answer yes, yes, yes, the HELOC is being used the proper way. If any answer is no, you're just moving the problem somewhere more dangerous.
Why banks are pushing this right now
Worth understanding the motive. A huge chunk of the U.S. economy is consumer spending. When people stop spending, the numbers look bad. Pulling equity out of homes and putting it back into circulation makes the economy look healthier — and it makes the bank money.
That's not a conspiracy, it's just incentives. The bank doesn't care whether you use the line to kill 20% debt or buy a bike. Both are good for them. Only one is good for you. Don't listen to what they say. Look at what they do.
What to try before you touch your home equity
A HELOC isn't the only way to lower your rate. Work through these first:
- A 0% balance transfer card. If the transfer fee and the promo window work out, this can beat a HELOC with no collateral at risk. Here's the real math on 0% cards.
- An auto refinance or cash-out on a car. Much smaller stakes than your house. I've broken down using an auto refinance to pay off credit card debt.
- Just paying more, targeted. Attack the highest rate first and the interest drag collapses fast. Run it in the debt avalanche calculator and see what an extra $100 or $200 does before you borrow anything.
- Temporary expense cuts. Boring, free, and under your control. Cutting expenses temporarily often frees up more than a rate swap does.
Keep your emergency fund either way
Don't drain your savings to zero to avoid borrowing. If you have no cushion, the next car repair or medical bill goes straight back onto a credit card and you've undone the whole plan. Three to six months of bills, or whatever version of that you can manage right now, comes first. Then everything extra goes at the high-interest debt.
And here's the part people miss: wiping out 20% debt is wealth building. Inflation has been running over 3%, and savings accounts and CDs are paying rates that barely keep up. Eliminating a 20% interest charge is a guaranteed return you cannot get anywhere else. Getting out of debt and preserving your wealth aren't two separate phases — they're the same move.
The bottom line
A HELOC to pay off credit card debt works when three things are true: the rate is dramatically lower, your monthly budget is already positive, and the cards stay at zero. In that case, trading 20% for 10% on $20,000 keeps about $2,000 a year in your pocket and gets you out years sooner.
If any of those three are shaky, leave your home equity alone and fix the budget first. Run your own numbers in the credit card payoff calculator, and if you want the full step-by-step, start with the free get out of debt course.