Using a HELOC to Buy a Car: How It Compares to an Auto Loan in 2026
FACT-CHECKEDFACT-CHECKEDThe question most people ask about financing a car with home equity is which option is cheaper. The more useful question is which asset you're willing to put on the line if the payments stop. A HELOC and an auto loan carry different collateral, and that difference matters as much as the rate you're quoted.
Key Takeaways
- A HELOC is secured by your home; an auto loan is secured by the car itself
- Missed HELOC payments carry foreclosure exposure, not just repossession risk
- Recent commercial bank data puts 72-month new car loan APR at 6.97%
- HELOC interest used to buy a car isn't tax-deductible under current IRS rules
- A car depreciates in years while a HELOC draw can amortize over a decade or two
The Collateral Question That Comes Before the Rate
Borrowers I've worked with over the years tend to walk into this comparison backwards. They pull up a rate quote for a HELOC, compare it to a rate quote for an auto loan, and whichever number is lower wins. Collateral is the piece that actually decides how much risk you're taking on, and it deserves the first look, before either rate quote.
An auto loan is secured by the vehicle you're buying. If you stop paying, the lender's remedy is to repossess the car. A HELOC, by contrast, is secured by your home. If you stop paying on a HELOC you used to buy a car, the lender's claim sits against your house instead of the vehicle, and that exposure can escalate all the way to foreclosure. Financing a car with a HELOC swaps which asset absorbs the risk if the loan goes sideways, and that swap is the real decision, underneath whatever rate you're comparing.
The question worth asking is which asset you want at risk if something in your life changes before this balance is paid off. A car you can't afford to keep paying for is a bad month. A house you can't afford to keep paying for is a different category of problem entirely.
Comparing the Actual Numbers
That's the simple version. The fuller picture needs real numbers next to each other, because the collateral difference means weighing the rate against the risk before you decide. A HELOC can still be the right call once you've done that math.
Recent commercial bank data puts the average interest rate on a 72-month new car loan at 6.97%, with finance-company auto loans averaging around $42,504 financed for a new vehicle. HELOC rates vary by lender and by your credit and equity position, and unlike a car loan's fixed rate, a HELOC typically carries a variable rate that can move with the broader rate environment for as long as you're carrying a balance. You could lock in a competitive HELOC rate today and be paying more a year from now on the same balance, something a fixed-rate auto loan doesn't expose you to.
That gap looks like this in dollars. Finance that same $42,504 as a 72-month auto loan at 6.97% and you'd pay roughly $9,627 in total interest over the six years, for a monthly payment near $724. Finance it instead through a HELOC that starts a couple of points above the auto loan rate, say 9%, for illustration, and stays there for the full six years, and you'd pay roughly $12,659 in total interest, about $3,000 more, with a monthly payment near $766. Push that illustrative HELOC rate up another point as the variable rate resets and the gap widens further. The auto loan's rate is fixed for the life of the loan; the HELOC's isn't, so the real comparison isn't 6.97% against whatever teaser rate you're quoted today, it's 6.97% fixed against a rate that can climb every time the broader rate environment moves.
There's also a term mismatch worth naming. Auto loans are typically structured to be paid off in the years the car is still useful, commonly five to six years. A HELOC draw can sit inside a draw period of around a decade followed by a repayment period that runs another decade or two. If you use home equity to buy a car and only make minimum payments, you could still be paying down that draw a decade after the car is gone. Matching how long you're financing something to how long it will actually last is a piece of the math a pure rate comparison misses entirely.
Stretch that mismatch out and the dollars get harder to ignore. Take a $30,000 draw used to buy a car. Financed like a car loan, over six years at 6.97%, it costs around $6,795 in total interest. Financed like a HELOC draw instead, paid at minimums, interest-only during a 10-year draw period at that same illustrative 9%, then amortized over a 15-year repayment period, you'd pay roughly $51,770 in total interest over 25 years before the balance is gone, more than seven times the interest of the auto loan, on the same $30,000. The car will be long gone and likely replaced before that draw is paid off. Those figures are what the amortization mismatch actually costs, in dollars rather than in theory.
The Tax Trap That Changes the Real Cost
A lot of borrowers assume tapping home equity is automatically the cheaper move because the advertised rate can look lower than an auto loan rate. That comparison is incomplete.
Mortgage interest, including HELOC interest, is only tax-deductible when the loan proceeds are used to buy, build, or substantially improve the home securing the debt. A car purchase does none of those things. That means HELOC interest used to buy a vehicle isn't deductible under current IRS rules, full stop. If you were counting on a tax break to make the equity option pencil out better than the auto loan, that assumption doesn't hold up.
Compare the two options on actual after-tax cost instead of the headline rate. Run the math and the "cheap equity money" story falls apart fast. On that $42,504 balance financed through a HELOC at an illustrative 9% over six years, you'd owe roughly $12,659 in interest, and because none of it is deductible, your after-tax cost is the same $12,659. An auto loan's interest was never deductible either, so its after-tax cost is also its full pre-tax cost, roughly $9,627 on the same balance at 6.97%. There's no deduction on either side to close that gap. The HELOC doesn't get cheaper once you look at it after tax; it just stays exactly as expensive as the pre-tax number already showed, while the auto loan you may have assumed was the costlier, no-tax-benefit option turns out to be the one that actually costs less, before and after tax.
When the Small-Balance Exception Applies
The collateral risk doesn't mean a HELOC is never the right tool for a car purchase. Balance size matters more than people expect, and it's the first thing AmeriSave's loan officers walk through with you if you're weighing equity against a traditional auto loan.
If you're carrying a large first mortgage and only need to borrow somewhere under $15,000 to $20,000 for the car, a HELOC can still make sense, because restructuring your entire first mortgage through a cash-out refinance to access that small amount of additional equity usually isn't worth the cost or the hassle. The math changes as the amount goes up. The larger the balance you need, the more that variable rate and decade-plus repayment tail work against you, and the more a traditional auto loan, sized to match the life of the car, looks like the disciplined choice.
This is also where your broader financial picture matters. If you're already carrying other debt on top of your first mortgage, adding a car to your home's collateral stack is a different decision than adding it when your only other obligation is the mortgage itself. Look at your full picture, not the car purchase alone, before you decide which structure fits.
What Actually Changes If the Payments Stop
AmeriSave's processing team routinely sees this surface late in a file, after the rate comparison is already settled and the collateral difference hasn't been weighed. Auto lenders enforce a contractual security interest in the vehicle itself, so default puts the car at risk while your home and your ability to keep living where you live stay untouched. Regulators have also taken direct action against loan servicers over wrongful repossession and servicing breakdowns in the auto finance space, a reminder that the auto-loan side of this comparison carries real enforcement risk any time a loan gets serviced poorly, on top of the ordinary risk of missing a payment.
A HELOC used for a car purchase carries a wider downside. The collateral is your house, and the CFPB is explicit that falling behind on a home-secured line of credit carries foreclosure exposure. A HELOC can still be the right tool for a car purchase, but that exposure means being honest about how stable your income and other obligations are likely to be across the entire repayment period, well beyond this month's budget.
Making the Decision for Your Own Situation
There isn't a single right answer here, and anyone who hands you one without asking about your specific situation is skipping steps. What actually decides this for you is a short list of variables: how much you need to borrow relative to your first mortgage balance, whether you can live with a variable rate over the repayment window, whether you were counting on a tax deduction that doesn't apply to a car purchase, and how comfortable you're putting your home behind a depreciating asset instead of keeping that risk contained to the vehicle itself.
Walk through those four things honestly before you sign anything. The option that keeps the collateral risk proportional to what you're actually financing, and that doesn't rely on a tax benefit you won't get, is usually the one that fits. When AmeriSave processes a HELOC application, that full-picture review, balance size, other debt, and intended use, happens before the numbers on a rate sheet ever get compared against an auto loan quote, because the two loans aren't actually interchangeable products wearing different price tags.
Consumer Financial Protection Bureau, "What is a home equity line of credit (HELOC)?": supports the definition of a HELOC as a variable-rate line of credit secured by the home, the foreclosure exposure tied to missed payments, and the structure of the draw period followed by a repayment period with payments that rise once repayment begins.
Consumer Financial Protection Bureau, "What is the difference between a home equity loan and a HELOC?": supports the structural distinction between a lump-sum home equity loan and a revolving HELOC, including the typically variable rate on a HELOC balance.
Federal Reserve, G.19 Consumer Credit statistical release: supports the 72-month new car loan average interest rate of 6.97% and the average amount financed on new-vehicle finance company loans.
Federal Trade Commission, Consumer Advice, "Home Equity Loans and Home Equity Lines of Credit": supports the description of auto loans as secured debt in which the vehicle serves as collateral subject to repossession on default.
Internal Revenue Service, Publication 936, Home Mortgage Interest Deduction: supports the rule that home equity loan and HELOC interest is deductible only when proceeds are used to buy, build, or substantially improve the home securing the debt, and that a car purchase does not qualify.
Consumer Financial Protection Bureau, Newsroom, "CFPB Takes Action Against Wrongful Auto Repossessions and Loan Servicing Breakdowns": supports the enforcement context around auto loan repossession and servicing risk as a point of comparison to HELOC foreclosure exposure.
Jon brings extensive experience in loan origination, sales leadership, and operations to AmeriSave, based in Waikiki, HI. Starting as a Loan Originator, he was promoted to Manager after 13 months and to VP eight months later, eventually managing 330 direct reports and establishing AmeriSave's Spanish lending channel. Married with three children, he specializes in transparent, technology-enabled lending that prioritizes client relationships and consumer empowerment.
Frequently Asked Questions
It depends on your balance size, your other debt, and how you weigh collateral risk. A HELOC can make sense for a small draw relative to a large first mortgage, since refinancing the whole mortgage for a small amount rarely makes financial sense. But because a HELOC is secured by your home, missed payments carry foreclosure exposure on top of the loss of the vehicle. Weigh that risk against a traditional auto loan, where the car itself is the only collateral at stake, before deciding which option actually fits your situation and your tolerance for risk.
It depends on the rate you qualify for and the tax treatment, both of which matter more than the number on a rate quote. Recent commercial bank data shows the average 72-month new car loan APR at 6.97%. HELOC rates vary and typically move with the broader rate environment since they're usually variable, unlike a fixed-rate auto loan. HELOC interest used to buy a car also isn't tax-deductible under current IRS rules, which removes a cost advantage some borrowers assume they're getting. Compare the two on total repayment cost and after-tax terms rather than the headline rate.
No. Interest on a home equity loan or HELOC is deductible only when the loan proceeds are used to buy, build, or substantially improve the home securing the debt. Buying a car doesn't meet that standard, so interest on a HELOC used for a vehicle purchase isn't deductible under current IRS rules. This matters because some borrowers assume home equity financing is automatically the cheaper path due to a lower advertised rate plus an assumed tax benefit. Without the deduction, the true after-tax cost comparison against a traditional auto loan can look very different than the headline rates alone suggest.
Falling behind on a HELOC puts your home at risk. Because a HELOC is secured by your house, sustained missed payments can escalate to foreclosure, regardless of what the borrowed money was originally used for. This is different from an auto loan, where the vehicle itself is the collateral and default leads to repossession of the car rather than exposure on your home. Before financing a car with home equity, be honest about how stable your income and other obligations are likely to be for the full length of the repayment period, years down the road as well as the near term.
Longer than the car will likely last, in many cases. A HELOC typically has a draw period of around a decade, followed by a repayment period that can run another decade or two. A car, meanwhile, depreciates steadily and is often financed on its own with a loan lasting five to six years. If you finance a car through a HELOC and only make minimum payments, you can end up paying down that balance long after the vehicle is gone, which is a term mismatch worth weighing before you decide.
Yes. If you need to borrow a relatively small amount against a large first mortgage, a HELOC can be the more practical choice, since refinancing the entire first mortgage through a cash-out refinance to access a small amount of equity usually isn't worth the cost. As the amount you need to borrow increases, the math shifts, and the variable rate combined with a repayment period that can outlast the car starts to work against the HELOC option. Look at the size of the draw relative to your existing mortgage balance before deciding which structure fits.
Yes. Adding a car purchase to your home's collateral stack is a different decision when you're already carrying other debt than when your mortgage is your only obligation. Look at your total financial picture, including any other loans or revolving balances, before deciding how to finance a vehicle. A structure that looks manageable in isolation can look different once it's stacked against everything else you're paying down, and that fuller picture is what should drive the decision.