HELOC vs. Cash-Out Refinance: Which One Actually Costs Less?

Both let you borrow against your home equity. Both can be smart tools — and both can be expensive mistakes. The difference comes down to how the math behaves over the next ten or twenty years, not the headline rate you see on a lender's website.

The two products in one paragraph each

A home equity line of credit (HELOC) is a revolving credit line secured by your home. You qualify once, then draw from it as needed during a multi-year draw period, paying interest only on what you've actually borrowed. After the draw period closes, the remaining balance amortizes — principal plus interest — over a longer repayment period, typically ten to twenty years.

A cash-out refinance is a new first mortgage that replaces your current one. You borrow more than you currently owe, and you walk out of closing with the difference as a lump-sum check. The new mortgage's rate, term, and balance are now your only mortgage obligation.

Comparing interest rates

HELOC and cash-out refinance rates vary by lender, credit, loan-to-value and market conditions. Compare current written offers and fees rather than relying on a general range.

Important nuance: the HELOC rate is variable in almost every case. The cash-out refinance rate is normally fixed for the life of the loan. A rate gap between the two can compress or invert if the index drops, or widen if it rises.

The monthly payment math

Imagine you have $400,000 left on a mortgage with 30 years remaining at 4%, and you want to pull $50,000 in equity for a kitchen remodel. The rates and terms below are hypothetical, not quotes.

Path 1: HELOC for $50,000 at 8.5%

During the 10-year draw period, interest-only payments are roughly $354/month.
When the draw period closes, the $50,000 amortizes over 20 years at the prevailing rate — about $434/month if rates hold.
Your existing 4% mortgage stays in place. You don't disturb that good rate.

Path 2: Cash-out refinance to $450,000 at 7%

New 30-year mortgage payment is roughly $2,994/month, vs. your current payment around $1,910. That's an extra $1,084/month.
Crucially, you've also reset your entire balance from a 4% rate to a 7% rate. The $400,000 you already owed is now significantly more expensive over its life.

For most homeowners with a sub-5% existing mortgage, the HELOC is dramatically cheaper. The cash-out refinance only wins in narrow scenarios: when current mortgage rates are lower than your existing rate, when you need a large sum (more than ~$100k), or when you specifically want the predictability of a fixed rate locked in for thirty years.

Closing costs and fees

HELOCs are usually low-fee — many lenders waive the origination fee, and appraisals can be AVM-based (free or under $100). Cash-out refinances carry full mortgage closing costs, typically 2%–5% of the new loan balance. On a $450,000 cash-out, that's $9,000–$22,500 out of pocket or rolled into the loan. That gap matters most when the cash you're pulling is small relative to total loan size.

Tax treatment (briefly, and consult your accountant)

Under current US tax rules, interest on home-equity debt — whether HELOC or cash-out — is may qualify for the home mortgage interest deduction if funds are used to buy, build, or substantially improve the home securing the loan and other requirements are met. Personal credit-card debt or a vacation generally does not qualify for that deduction. See IRS Publication 936.

We are not your tax advisor and tax law moves. Get a CPA opinion before relying on deductibility in your math.

Risk profile — what can go wrong

HELOC risks

Variable rate exposure. A two-point rise on a $50,000 balance is roughly $83 more per month. Stress-test your numbers at +3% and +5%.
Payment shock at the end of the draw period. Interest-only payments feel friendly. The amortizing payment that follows is a different animal.
Lender freeze. Lenders have the right to freeze or cut HELOCs in downturns. It happened in 2008 and again in 2020.

Cash-out refinance risks

You give up your old rate. If you're sitting on a 3% or 4% mortgage, this can change the economics substantially; compare the full repayment period and fees.
Higher closing costs. Several thousand dollars upfront vs. nearly zero on a HELOC.
Reset amortization clock. Going back to a 30-year term restarts the interest-heavy front of the schedule.

Decision framework — pick the one that fits

Pick a HELOC if: you need flexibility (you'll draw over time, not all at once), you have a low-rate first mortgage you don't want to disturb, you can stomach variable-rate risk, or the amount needed is modest (under ~$100k).

Pick a cash-out refinance if: current mortgage rates are at or below your existing rate, you need a single large sum, you want absolute payment certainty for the next thirty years, or you're consolidating multiple high-rate debts and the total picture is worth it.

What to do next

Run your actual numbers — yours, not the example — through our HELOC calculator. Save the result. Then call two lenders and compare what they actually offer against the math you ran here. The lender that gives you the cleanest, most-itemized quote is usually the lender worth dealing with.