HELOC Loan Explained: Draw, Repay & Real Costs

A HELOC loan is a revolving line of credit secured by your home's equity. You borrow as needed during a draw period (often 10 years), usually paying interest only, then repay principal plus interest over a repayment period (often 20 years). The rate is typically variable: the prime rate plus a lender margin.

That one paragraph covers the mechanics, but the costs of a home equity line of credit show up at specific points in its life: at closing, every month during the draw, and — most painfully — the month the repayment period starts. This guide follows one HELOC from application to payoff, with the payment at each phase, so you can see the real cost before you sign. All figures are illustrative and use the prime rate of 7.00% reported by the Federal Reserve for late September 2026; your lender's margin and terms will differ.

What a HELOC loan is (and how it differs from a home equity loan)

A home equity line of credit works like a credit card backed by your house. The lender approves a maximum credit limit based on how much equity you have, and you draw money from it when you need it — by transfer, cheque or card, depending on the lender. You only pay interest on what you have actually drawn, and as you repay, that credit becomes available again during the draw period.

A home equity loan, by contrast, pays out one lump sum at a fixed rate and starts full principal-and-interest payments immediately. Both are usually second mortgages, sitting behind your first mortgage, and both put your home at risk if you can't pay. To see what your own draw would cost each month, run it through our HELOC payment calculator before comparing offers.

How much you can borrow: equity, CLTV and credit

Lenders cap the total of your first mortgage plus the HELOC at a percentage of your home's appraised value, called the combined loan-to-value ratio (CLTV). Many lenders cap CLTV around 80% to 85%, and some go higher for strong borrowers. They also look at your credit score (many want a FICO score in the high 600s or better) and your debt-to-income ratio (DTI), often capped around 43%.

The formula is simple: home value × CLTV limit − mortgage balance. Your approved line may be lower if your income or credit doesn't support the full amount.

The HELOC lifecycle: draw, repay and the real payment at each phase

Here is one HELOC followed through its life. Assume a $100,000 line, fully drawn, at 8.00% (prime of 7.00% plus a 1.00% margin), with a 10-year draw period and a 20-year repayment period. Real HELOCs rarely stay fully drawn, and the rate will move, but this shows the shape of the costs.

The jump at year 11 is called payment shock. It is bigger when the repayment period is shorter: on a 10-year repayment period the same $100,000 would cost about $1,213 a month, nearly double the interest-only payment. We break down those numbers further in our worked examples of HELOC monthly payments from $50K to $200K.

How rate changes move the payment

Because most HELOC rates are prime plus a margin, your payment moves when the Fed moves. Prime is set by banks at 3 percentage points above the upper end of the federal funds target range. The table shows the monthly cost of a $50,000 balance at three rates.

Some lenders let you lock part of your balance at a fixed rate during the draw. It costs a little more in rate but protects against rising prime. For the full interest-only picture, see our guide to interest-only HELOC payments.

The real costs of a HELOC loan beyond interest

Interest is the biggest cost, but it isn't the only one. Fees vary widely by lender, and many banks advertise no closing costs while recovering them through an early-closure fee if you shut the line within a set period.

• Appraisal. Some lenders use automated valuations; others order a full appraisal.
• Origination or closing costs. Title search, recording fees, credit report. Sometimes waived.
• Annual fee. A flat yearly fee on some lines, charged whether or not you draw.
• Early-closure fee. Common if you close within the first few years after the lender covered closing costs.
• Inactivity or minimum-draw rules. A few lenders require an initial draw or charge if the line sits unused.

Ask for the lender's disclosures under the Truth in Lending Act, which requires HELOC lenders to disclose rate terms, fees and payment rules before you commit. The APR on a HELOC usually reflects only interest, not fees, so compare the fee schedules side by side.

How to get a HELOC loan, step by step

1. Estimate your equity. Use a recent sale price of similar homes or an online estimate, then apply the CLTV formula above. Be conservative; the appraisal decides.
2. Check your credit and DTI. Pull your credit reports, fix errors and add up monthly debts. Paying down a credit card before applying can improve both your score and your DTI.
3. Get quotes from at least three lenders. Compare a bank, a credit union and an online lender. Ask each for the margin over prime, any introductory rate and when it ends, fees, the draw and repayment lengths, and rate caps.
4. Read the repayment terms, not just the rate. Confirm whether the repayment period is fully amortizing or ends in a balloon, and whether you can convert draws to a fixed rate.
5. Submit documents and schedule the appraisal. Expect pay stubs, W-2s or tax returns, mortgage statements and homeowners insurance details.
6. Close and wait out the rescission period. For a HELOC on your primary home you generally have a three-business-day right to cancel after closing before funds are available.

Five ways to soften payment shock

• Pay principal during the draw. Even $100 a month above interest shrinks the balance that gets amortized later.
• Draw only what you need, when you need it. Interest accrues only on the balance you use.
• Fix part of the balance. A fixed-rate lock on a large draw turns an unpredictable payment into a known one.
• Plan the switch-over date. Put the end of your draw period in your calendar two years ahead and model the new payment then.
• Refinance before the cliff if it makes sense. A new HELOC, a home equity loan or a cash-out refinance can spread the balance differently, at the cost of new fees.

Risks: freezes, foreclosure and taxes

Your home is the collateral. Falling behind on a HELOC can ultimately lead to foreclosure, just like your first mortgage.

Lenders can freeze or cut your line. Federal rules allow a lender to suspend draws or reduce your limit if your home's value drops significantly or your finances materially change. Don't count on unused credit as your emergency fund.

Interest deductibility is narrow. Under current IRS rules, HELOC interest is generally deductible only if the money is used to buy, build or substantially improve the home that secures the loan, and only if you itemize. Debt consolidation or car purchases don't qualify.

Is a HELOC loan right for you? A quick checklist

The best test is simple: budget for the repayment-period payment, not the teaser interest-only one. If that number works, a HELOC can be one of the cheapest ways to borrow against your home. Use the HELOC payment calculator to try different balances and rates, and check the current prime rate on the Federal Reserve's H.15 release.

This article is general information, not financial, tax or legal advice. Figures are approximate and change over time — always verify with a qualified professional or the official source before making a decision.

Written and reviewed by the HELOC Payment Calculator editorial team. Facts checked against primary sources; see the reference above.

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