What it means
Equity is the difference between what a property is worth and what is still owed on it. A HELOC lets an owner borrow against a slice of that equity without selling the property or refinancing the existing mortgage.
The product has two distinct phases, and confusing them is the single biggest source of unpleasant surprises. During the draw period, often around ten years, the borrower can take money out and typically pays interest only; when the repayment period begins, drawing stops and the balance must be repaid with principal, which can double or triple the monthly payment overnight.
Lenders size the line using a combined loan to value limit, commonly somewhere between 80% and 90% of the property's value including the existing mortgage. Approval also depends on income, credit history and the property valuation, and the lender can reduce or freeze an unused line if property values fall.
Rates are usually variable, tracking a published benchmark plus a margin, which means the cost of the borrowing moves with interest rates. That variability is manageable on a small balance and uncomfortable on a large one, particularly during the repayment phase.
Small business owners often use a HELOC as cheap working capital, and it deserves a health warning. Financing business risk with the family home converts a limited commercial exposure into a personal one, and lenders offering business credit would price that risk far higher for good reason.
In practice
Real-world examples
Example 1
A couple opens a $130,000 line to renovate a kitchen and bathroom in stages. They draw $40,000 for the first phase and avoid paying interest on the rest until the second contractor starts eight months later.
Example 2
A freelance consultant uses a HELOC as a buffer against irregular client payments, drawing when invoices run late and repaying within weeks. The cost is low, but she keeps the balance small because the security is her home.
Example 3
A restaurant owner draws $95,000 to fit out a second site. Two years later, rates have risen and the draw period ends, and the combined payment forces him to refinance the whole balance into a fixed rate business loan.
Think of it
HELOC is a credit line against your home-flexible borrowing on home equity.
Formula
Calculation
Available credit = (property value x maximum combined loan to value) - outstanding mortgage balance
A home is valued at $600,000 with $380,000 still owed on the mortgage, leaving $220,000 of equity. If the lender allows a combined loan to value of 85%, the maximum total borrowing is $600,000 x 0.85 = $510,000, so the available line is $510,000 - $380,000 = $130,000.
Suppose the owner draws $60,000 at a variable rate of 9%. During the draw period the interest only cost is $60,000 x 0.09 = $5,400 a year, or $450 a month. Once the repayment period starts and that $60,000 must be repaid over 15 years at the same 9%, the monthly payment rises to roughly $609, and the payment shock is larger still for anyone who drew the full $130,000.Case study
Seen in the real world
This is an illustrative and fictional example. Priya Mallory, an invented owner of a small garden design business, took out a HELOC against a home valued at $600,000 with a $380,000 mortgage, giving her a line of $130,000. She drew $60,000 to buy two vans and a trailer, paying $450 a month in interest during the draw period, which felt very comfortable against her monthly revenue.
The fictional difficulty came at the end of year ten. Her draw period closed, the balance moved into repayment, and the monthly cost rose to about $609 for principal and interest at 9%. That alone was manageable, but she had also drawn a further $40,000 during a slow winter, and the combined repayment was close to $1,015 a month against a business that had not grown.
Priya's illustrative fix was unglamorous: she refinanced the $100,000 balance into a longer term loan and set a personal rule that the line would only ever fund assets with a clear payback, never day to day cash gaps. The equity in her home stopped being an overdraft and went back to being a reserve.
Watch out
Common mistakes
- Treating the draw period's interest only payment as the true cost of the loan, then being caught out when principal repayments begin.
- Using a HELOC for ongoing living or trading costs rather than for assets or projects with a defined payback.
- Assuming the approved limit is guaranteed, when lenders can freeze or reduce an unused line if the property valuation or the borrower's circumstances change.
Questions
People also ask
How is a HELOC different from a home equity loan?
A home equity loan pays out a single lump sum at a fixed rate with set repayments, while a HELOC is a revolving line that can be drawn and repaid repeatedly.
What happens if property values fall?
The lender may cut the available limit, and if the balance exceeds the equity the owner can be left owing more than the house is worth.
Is the interest tax deductible?
In the United States it can be when the funds are used to buy, build or substantially improve the property securing the loan, but the rules are specific and worth checking with a tax adviser.