If you own a home, you own two things: the home itself and the equity inside it. Equity is the portion of the home's value that is not mortgaged, and for many American households it is the single largest asset they will ever have.
The question most homeowners eventually face is not whether they have equity, but how to access it safely. The two most common tools are the home equity line of credit (HELOC) and the home equity loan. They sound similar, share collateral, and are often offered by the same lender, but they behave very differently. Choosing the wrong one can cost thousands in interest or leave you exposed to a payment shock years later.
This guide explains how each product works, how lenders size them, when each makes sense, and the risks worth taking seriously before signing.
What Home Equity Actually Is
Home equity is the difference between your home's current market value and the balance of any loans secured against it.
Example: Your home is worth $500,000. You owe $280,000 on your mortgage. Your equity is $220,000.
Equity grows in two ways: by paying down the mortgage principal and by the home appreciating in value. Both HELOCs and home equity loans let you borrow against that equity while keeping the original mortgage in place. They sit in second-lien position, which is why their interest rates are higher than a first mortgage but usually lower than unsecured debt like credit cards or personal loans.
HELOC: A Revolving Line of Credit Against Your Home
A HELOC works much like a credit card, except the credit line is secured by your home and the interest rate is far lower. Once approved, you have access to a set credit limit that you can draw on, repay, and draw on again.
A HELOC has two distinct phases:
Draw period (typically 10 years)
You can borrow up to your credit limit as needed. During this phase, many HELOCs require only interest-only payments on the outstanding balance. The rate is almost always variable, tied to the prime rate plus a margin, so the monthly payment changes as interest rates move.
Repayment period (typically 10 to 20 years)
The line closes to new borrowing, and the remaining balance amortizes into principal-and-interest payments over the repayment term. This is where payment shock often hits: a homeowner who paid $300 per month in interest during the draw period can suddenly face $900 per month once principal repayment begins.
The flexibility is the main attraction. You borrow only what you need, when you need it, and pay interest only on the outstanding balance.
Home Equity Loan: Lump Sum at a Fixed Rate
A home equity loan (sometimes called a 'second mortgage') is the opposite of a HELOC in almost every dimension. You receive the full amount at closing, at a fixed interest rate, and you repay it over a fixed term (commonly 5 to 30 years) with equal monthly payments of principal and interest.
There is no draw period, no variable rate, no repayment shock. You know on day one exactly how much you borrowed, what you will pay each month, and when the loan will be gone.
Side by Side Comparison
| Feature | HELOC | Home Equity Loan |
|---|---|---|
| Structure | Revolving line of credit | Lump sum, installment loan |
| Interest rate | Variable (prime + margin) | Fixed |
| Access to funds | As needed during draw period | All at closing |
| Payment pattern | Interest-only (draw), then P+I (repayment) | Fixed P+I from month one |
| Predictability | Low (rate and balance both vary) | High |
| Flexibility | High | Low |
| Best suited to | Multi-stage projects, emergency backstop | Single large expense with known cost |
| Risk of payment shock | Yes, at end of draw period | No |
| Tax deductibility (US) | Only if proceeds used for home improvements | Only if proceeds used for home improvements |
How Lenders Size the Loan: CLTV
The critical number for both products is combined loan-to-value, or CLTV. It is the total of all loans secured by the home divided by the home's appraised value.
CLTV = (First mortgage balance + New HELOC or loan) / Home value
Most lenders cap CLTV between 80% and 90%, though some go to 95% or even 100% for well-qualified borrowers. The cap is what limits how much you can actually borrow.
Worked example
- Home value: $500,000
- Existing mortgage balance: $280,000
- Lender maximum CLTV: 85%
Maximum total secured debt allowed: $500,000 x 0.85 = $425,000. Subtract the existing mortgage: $425,000 - $280,000 = $145,000. That is the maximum HELOC line or home equity loan the lender will extend.
Raise the CLTV cap to 90% and the maximum jumps to $170,000. Drop it to 80% and it falls to $120,000. Small percentage changes move the number significantly.
You can run your own numbers using the HELOC calculator, and if you are also weighing whether to refinance the first mortgage instead, a mortgage calculator or refinance calculator will round out the picture.
A Concrete HELOC Timeline
To make the draw-then-repayment mechanic tangible, imagine a $100,000 HELOC at 8.5% variable, with a 10-year draw period and 20-year repayment.
Years 1 to 10 (draw period):
- You draw $60,000 over several years for a kitchen remodel and a bathroom update.
- Interest-only payment on $60,000 at 8.5%: roughly $425 per month.
- If rates rise to 10%, the payment becomes roughly $500 per month.
Year 11 (start of repayment):
- Outstanding balance of $60,000 amortizes over 20 years.
- Monthly payment at 8.5%: roughly $520 per month (principal and interest).
That last transition looks mild in this example because the balance is modest. With a higher balance or higher rate, monthly payments can easily double or triple overnight. Anyone using a HELOC should model the repayment-phase payment at current rates, not just the teaser draw-period payment.
When a HELOC Makes Sense
- Multi-stage home improvements where costs trickle in over months or years.
- Emergency backstop. Opening a HELOC while you have strong income and home value, then leaving it largely undrawn, is a low-cost form of liquidity insurance.
- Bridge financing between homes, for buyers who need to close on a new property before the old one sells.
- Irregular expenses where the total is uncertain (for example, a renovation that uncovers problems).
The key trait in all these cases: you do not know the exact amount you need, or you do not need it all at once.
When a Home Equity Loan Is Better
- One-time, known-cost projects like a full kitchen replacement with a signed contract.
- Debt consolidation where you want a fixed payoff date and no temptation to redraw.
- Rising-rate environments where locking in a rate today is preferable to floating with prime.
- Borrowers who want certainty. If a variable payment would stress your monthly budget, the fixed structure is worth a slightly higher starting rate.
The key trait: you know the exact number, and you want to stop thinking about it.
Tax Deductibility: The Rule Most People Get Wrong
Under current US tax law (post-TCJA), interest on HELOCs and home equity loans is deductible only when the proceeds are used to buy, build, or substantially improve the home that secures the loan. Using the funds to pay off credit cards, buy a car, or pay tuition means the interest is not deductible, even though the loan is secured by your home.
Additional limits:
- Total acquisition indebtedness (first mortgage plus any home-improvement second) must stay under $750,000 for loans taken after December 15, 2017 ($1 million for older loans) for full deductibility.
- You must itemize deductions to benefit. Many households now take the standard deduction and receive no tax benefit from mortgage or HELOC interest, improvement or not.
As always, verify with a tax professional for your specific situation; these rules have changed before and may change again.
Risks Worth Taking Seriously
Variable rates
HELOC rates move with prime. A 3-percentage-point jump on a $100,000 balance adds $250 per month in interest during the draw phase. Budget with realistic upper-bound rates, not today's rate.
Foreclosure
Both products are secured by your home. Missed payments can lead to foreclosure in the same way as a first mortgage. Home equity debt is not like credit card debt; the stakes are higher.
Lifestyle creep
A HELOC is dangerously convenient. Using a line of credit that is technically for 'home improvements' to fund lifestyle spending is one of the most common ways homeowners end up overleveraged right before a downturn. If the funds are not going into the home or into clearly productive uses, reconsider.
Underwater risk
If home values fall after you borrow, you can end up owing more than the home is worth. Lenders can also freeze or reduce undrawn HELOC limits during housing downturns, which is exactly when you might want the liquidity most.
Choosing Between the Two
A short decision framework:
- Do you know the exact amount and timing? If yes, lean home equity loan. If no, lean HELOC.
- Can you absorb payment variability? If no, lean home equity loan.
- Do you value optionality more than certainty? If yes, lean HELOC.
- Are rates expected to rise meaningfully? That tilts the decision toward a fixed home equity loan.
- Would a cash-out refinance be better? If your current mortgage rate is near today's market rate, a cash-out refi can sometimes beat either product. If your existing rate is much lower than today's, leave the first mortgage alone and use a second lien.
Frequently Asked Questions
Can I have both a HELOC and a home equity loan?
Yes, if your combined CLTV still fits within lender limits. It is uncommon, but some borrowers use a home equity loan for a known renovation and keep a small HELOC as an emergency reserve.
Does taking out a HELOC hurt my credit score?
Opening any credit account causes a small, temporary dip. A HELOC reports as a revolving account, so high utilization can weigh on your score the same way a maxed credit card does. Carrying a modest balance relative to the limit is fine; running the line near its cap is not.
What happens to my HELOC if I sell the house?
The HELOC must be paid off at closing, just like a first mortgage. The title company handles this out of the sale proceeds. If the HELOC is undrawn, it simply closes; there is nothing to repay.
How is a HELOC different from a cash-out refinance?
A cash-out refinance replaces your entire first mortgage with a new, larger mortgage and gives you the difference in cash. A HELOC or home equity loan leaves your first mortgage alone and adds a second lien on top. If you locked in a very low first-mortgage rate years ago, a second lien is usually the better choice because it preserves that rate.
Bottom Line
Both HELOCs and home equity loans let you tap the equity you have already built, at rates meaningfully lower than unsecured borrowing. The right choice depends on three things: how certain you are about the amount, how comfortable you are with rate risk, and how disciplined you expect to be with access to a revolving line.
Before committing, run your own numbers through the HELOC calculator to see what your CLTV allows and how draw-period vs repayment-period payments compare. If you are also considering restructuring the first mortgage, the mortgage calculator and refinance calculator will help you compare a second lien against a full cash-out refinance.
Home equity is patient money. The goal is to use it in ways that make your finances more resilient, not less.