A home equity line of credit, or HELOC, is a revolving loan secured by your house: your lender approves you for a credit limit based on your equity, you draw from it as needed during a set borrowing window, and you pay interest only on what you actually use. It behaves like a credit card with your home as collateral, which means the flexibility is real and so is the risk of foreclosure if you fall behind.
How a HELOC Works
Instead of handing you a lump sum, the lender opens a pool of money you can tap whenever you need it during the draw period. The HELOC is recorded as a subordinate lien against your property, sitting behind your primary mortgage in repayment priority.1Fannie Mae. First Lien with Subordinate Financing Interest accrues only on the balance you’ve drawn, not on the full approved limit.
The revolving structure suits costs that arrive in stages, like a renovation paid out to contractors over several months. You can also leave the line untouched and owe nothing until you need it. The trade-off is that treating your home equity like a checking account gets expensive quickly, and the collateral is where you live.
The Draw Period and the Repayment Period
A HELOC splits into two phases. The draw period usually lasts about ten years. During that time you can borrow from the line, and monthly payments often cover interest only. Low payments feel manageable, but they do nothing to reduce principal. Borrow $50,000, pay interest only for ten years, and you still owe $50,000 at the end.
Then the repayment period starts, commonly running 10 to 20 years depending on the lender.2Consumer Financial Protection Bureau. What You Should Know About Home Equity Lines of Credit You can no longer draw funds, and payments shift to cover both principal and interest. A $60,000 balance at 9 percent costs about $450 per month in interest alone; amortized over 15 years, the same balance runs roughly $608 per month. Borrowers who made minimum payments through the draw period often aren’t ready for the jump. Voluntary principal payments earlier on blunt the shock.
Balloon Payments
Some HELOC agreements require a balloon payment, meaning the full remaining balance is due at once when the term ends.2Consumer Financial Protection Bureau. What You Should Know About Home Equity Lines of Credit If you can’t pay it, your options narrow to refinancing with the current lender, replacing the loan elsewhere, or selling the house. Check your agreement before you sign so you know whether a balloon applies and when it would hit.
How Interest Is Charged
HELOC rates are almost always variable. Your rate equals an index, typically the U.S. Prime Rate, plus a fixed margin set by your lender at closing. The margin stays constant for the life of the loan and reflects your credit score, loan-to-value ratio, and the lender’s pricing. When Prime moves, your rate moves with it.
Most agreements include a lifetime cap limiting how high the rate can go. That ceiling deserves a careful look. A loan that starts at 8 percent might be capped at 18 percent, and if Prime climbs sharply, your monthly payment can grow substantially before hitting the limit. Find the cap in your loan documents before you sign.
Fixed-Rate Lock Options
Some lenders let you lock a portion of your outstanding balance into a fixed rate. If you’ve drawn $40,000 for a kitchen remodel, you can convert that chunk to a fixed rate while leaving the rest of the line variable for future use. The locked portion typically converts to a fully amortizing payment, so you begin paying down principal on it right away. Not every lender offers this feature, so ask during the application if rate stability matters to you.
What You Need to Qualify
Lenders look at four main things: your equity, your credit score, your debt-to-income ratio, and your income documentation.
Equity and Loan-to-Value
You need enough equity to support the line. Most lenders require that your primary mortgage plus the new HELOC stay at or below 80 to 85 percent of appraised value. Fannie Mae guidelines permit combined loan-to-value ratios up to 90 percent for primary residences with subordinate financing, though individual lenders often set lower limits.3Fannie Mae. Eligibility Matrix
Credit Score and Debt-to-Income
Most lenders want a credit score of at least 620 to 680, with better pricing for higher scores. Your debt-to-income ratio compares total monthly debt payments to gross monthly income. A DTI at or below 43 percent is a common approval threshold; some lenders prefer 36 percent, others will stretch to 50 percent on strong applications.
Documents to Gather
Expect to provide W-2s, federal tax returns from the previous two years, and recent pay stubs. Lenders also want current statements from your primary mortgage, proof of homeowner’s insurance, and your most recent property tax assessment. You’ll verify ownership with a copy of the deed or a title insurance policy showing no conflicting liens.
How Much You Can Borrow
The math is simple. Multiply your home’s appraised value by the lender’s maximum combined loan-to-value percentage, then subtract what you still owe on your primary mortgage. What’s left is your HELOC limit.
Say your home appraises at $500,000 and the lender allows 80 percent combined loan-to-value. The total debt cap is $400,000. If you owe $300,000 on your primary mortgage, your HELOC limit comes out to $100,000. At 85 percent, the same house yields $125,000. The gap between percentage tiers can matter, so compare lenders if you need more borrowing room.
Costs to Expect
Some lenders advertise no closing costs; others charge fees that add up. Common ones include:
- Appraisal fee: typically $350 to $550, reaching $800 for larger or hard-to-access properties.
- Title search and insurance: the lender confirms no competing liens; cost varies by location.
- Annual fee: a yearly maintenance charge of $5 to $250, owed whether you use the line or not.
- Inactivity fee: $5 to $50 if you don’t draw from the line for a stretch.
- Early termination fee: $200 to $500 if you close the HELOC within the first few years.
- Recording fees: state and county charges to record the lien on your title.
Ask every lender for a full fee breakdown. A slightly higher rate with no upfront costs can beat a lower rate paired with $1,500 in fees, depending on how much you plan to borrow and how long you’ll carry a balance.
When HELOC Interest Is Tax-Deductible
Interest on a HELOC is deductible only if you use the borrowed money to buy, build, or substantially improve the home that secures the loan.4Internal Revenue Service. Real Estate (Taxes, Mortgage Interest, Points, Other Property Expenses) 2 Using HELOC funds to pay off credit cards, cover tuition, or take a vacation makes the interest on those amounts nondeductible. This rule, originally part of the Tax Cuts and Jobs Act, was made permanent in 2025.
There’s also a dollar cap. You can deduct interest on up to $750,000 of combined mortgage debt ($375,000 if married filing separately) for loans taken out after December 15, 2017.5Internal Revenue Service. Publication 936 (2025), Home Mortgage Interest Deduction The cap includes your primary mortgage and HELOC together. If your first mortgage already sits at $700,000, only $50,000 of HELOC debt qualifies. Mortgages originating before December 16, 2017 fall under the older $1 million limit.
If you split HELOC funds between qualifying improvements and personal spending, only the improvement portion is deductible. Keep invoices and receipts. Eligible projects include replacing a roof, finishing a basement, or installing a new HVAC system; routine maintenance and minor repairs don’t count as substantial improvements.
Risks Worth Weighing
The Lender Can Freeze or Reduce the Line
If your home’s value falls significantly after approval, your lender can reduce or freeze the credit line. Federal law permits this, and it can happen without warning.6HelpWithMyBank.gov. Can the Bank Freeze My HELOC Because the Value of My Home Declined? If you’re counting on available credit for a renovation already underway, a freeze can leave you scrambling.
Foreclosure
Because the loan is secured by your house, default can lead to foreclosure even though the HELOC sits behind your primary mortgage. HELOC lenders are often slower to foreclose than first-lien holders because they would be paid last in a sale, but they keep the legal right to do so. Contact your lender early if payments become difficult; some offer hardship modifications.
You Have Three Business Days to Cancel
Under Regulation Z, you can cancel the HELOC until midnight of the third business day after consummation, delivery of the required disclosure notice, or delivery of all material disclosures, whichever is latest.7eCFR. 12 CFR 1026.23 – Right of Rescission If you rescind, the lien becomes void and you owe nothing, including any finance charges. If the lender never provides the required notices, the cancellation right can extend up to three years. Funds typically become accessible one to two weeks after the rescission window closes.