HELOC Basics

You own a home with equity and you are thinking about using some of it. How does a HELOC work, exactly? A home equity line of credit gives you access to a revolving credit limit secured by your home -- you draw from it when you need it, repay it, and draw again. You only pay interest on what you actually borrow. The HELOC draw period mechanics are straightforward. The risks, particularly around variable rates, are where most borrowers get surprised.

What Home Equity Is and How It Accumulates

Home equity is the difference between your home's current market value and the remaining balance on your mortgage. On a $500,000 home with a $300,000 mortgage, you have $200,000 in equity.

Equity builds two ways: through principal payments that reduce your mortgage balance, and through appreciation that increases your home's value. Both count. A home that rises in value while you pay down the loan can generate significant equity relatively quickly.

How a HELOC Works

A HELOC is a revolving line of credit with your home as collateral. Think of it like a credit card with a large limit and a much lower interest rate. You draw against the line when you need funds, repay it, and draw again. Interest accrues only on the outstanding balance, not the full credit limit.

What makes HELOCs different from other loans: you do not receive a lump sum. The flexibility is the point. You access what you need when you need it.

The Two Phases You Need to Understand

• Draw period (typically ten years): You can borrow up to your credit limit, repay, and borrow again. Minimum payments during the draw period are often interest-only, which keeps monthly costs low but does not reduce the principal balance at all.
• Repayment period (typically ten to twenty years): The draw period closes. No more borrowing. Your outstanding balance now converts to a fully amortizing loan, and your required payment rises accordingly.

How Much You Can Borrow

Most lenders allow you to borrow up to 80 to 85 percent of your home's value, minus what you still owe. The calculation:

(Home value times LTV threshold) minus mortgage balance equals your HELOC credit limit.

On a $500,000 home with a $300,000 mortgage at 80 percent LTV: ($500,000 times 0.80) minus $300,000 equals a $100,000 HELOC limit.

The Variable Rate Risk Most Borrowers Underestimate

HELOCs carry variable interest rates tied to the prime rate, which moves with Federal Reserve policy decisions. Rates have risen 3 to 5 percentage points in a single calendar year in recent history. A HELOC that cost you $500 per month when you opened it can cost $700 or more two years later without you doing anything differently.

Some lenders offer the ability to lock a fixed rate on a portion of your outstanding HELOC balance. If you have a large balance and rates are rising, this protection is worth asking about.

What HELOCs Are Good For -- and What They Are Not

• Home improvements: The classic use and often a sound one -- renovations that add value can justify borrowing against the home to fund them.
• Debt consolidation: A lower-rate HELOC can pay off higher-rate credit card debt and reduce interest costs. The trade-off is significant: you are converting unsecured debt to debt secured by your home. Miss a credit card payment and your credit takes a hit. Miss a HELOC payment and you can lose the home.
• Emergency access: An open, undrawn HELOC costs you nothing until you use it. Some homeowners maintain one for unexpected large expenses without paying interest unless they draw.
• Vacations, cars, or everyday expenses: Do not use a HELOC for these. You are borrowing against your home to fund depreciating assets or consumption. The math does not work in your favor.

HELOC Versus Cash-Out Refinance: Which One to Use

Both let you access home equity. The decision between them comes down to what is happening with your first mortgage rate.

• A HELOC sits behind your first mortgage without touching it. If you locked in a 3.5 percent rate in 2021, a HELOC lets you access equity while keeping that rate in place.
• A cash-out refinance replaces your entire first mortgage with a new, larger loan at today's rate. If current rates are meaningfully higher than your existing rate, a cash-out refinance forces you to lose your favorable rate on the full balance -- not just the equity portion.

If your first mortgage carries a rate you would not want to give up, a HELOC is almost always the better tool for accessing equity in the current environment. If your first mortgage rate is already high, a cash-out refinance that consolidates everything at a lower rate may make more sense.