Calculate your HELOC borrowing limit, interest-only draw payment, higher repayment payment, and total interest, with a payment-shock warning.
Estimates only and not financial advice. Assumes the full line is drawn up front, an interest-only draw period, and an 80% maximum combined loan-to-value; lender limits vary (some allow 85-90%). HELOC rates are usually variable, so your real payment will change as rates move — the rate you enter is a snapshot. Excludes closing costs, annual fees, and taxes.
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A Home Equity Line of Credit (HELOC) offers flexible access to your home's equity, but its two-phase payment structure catches many borrowers off guard. This HELOC calculator shows how much you can borrow at your lender's loan-to-value limit, what you'll pay during the interest-only draw period, and the higher principal-and-interest payment once repayment begins — so you can plan ahead and avoid payment shock.
A HELOC is a revolving line of credit secured by your home equity. Unlike a home equity loan, which hands you a lump sum, you draw funds as needed during the draw period (typically 5-10 years), usually paying interest only. When the draw period ends you enter the repayment period (often 10-20 years), where you pay both principal and interest and can no longer borrow. Because no principal is paid during the draw period, the payment rises sharply at that hand-off, and the interest-only years add substantially to the total cost.
HELOC Payment Formulas
Fund a kitchen remodel, bathroom upgrade, or addition, drawing funds as the project progresses rather than borrowing a lump sum. Improvements may also raise your home's value.
Replace 20%+ credit-card rates with a single-digit HELOC rate. The savings can be large, but you are converting unsecured debt into debt secured by your home.
Open a HELOC as a safety net. You pay nothing unless you draw on it, but have fast access for a medical bill, job loss, or major repair.
Draw funds each semester as tuition is due. HELOC rates are often lower than private student loans, though the debt is secured by your home.
Tap your primary home's equity for a rental-property down payment. This can accelerate wealth-building but raises your overall risk.
Access flexible funds that match irregular business cash needs. Be cautious: if the business fails, your home is on the line.
The payment can rise sharply — often 25-75%, and more than double if the repayment period is shorter than the draw period — when you move from draw to repayment. Know both amounts before you borrow.
Interest-only payments feel cheap, but you pay them for years without reducing principal. The calculator adds draw-period interest and repayment-period interest into one honest total.
Lenders usually cap combined loan-to-value (CLTV) around 80-85%. The calculator shows your available equity and whether your desired amount is within reach.
For a $50,000 HELOC at 8.5% with a 10-year draw and 20-year repayment, the interest-only draw payment is about $354/month. When the 20-year repayment period begins it rises to about $434/month (principal + interest). Because you pay interest only for the first 10 years, total interest over the full 30 years is roughly $96,600. Use the calculator for your exact rate and terms.
Most lenders allow a combined loan-to-value (CLTV) of 80-85%. If your home is worth $400,000 and you owe $200,000, your available equity at 80% CLTV is $120,000 ($400,000 × 0.80 − $200,000). Some lenders go up to 90% CLTV at higher rates.
A HELOC is flexible — draw only what you need, when you need it, on a variable rate. A home equity loan gives a lump sum at a fixed rate with fixed payments. Choose a HELOC for ongoing or uncertain costs (renovations, tuition); choose a home equity loan for a one-time expense where you want a predictable payment.
Most HELOCs carry a variable rate tied to the Prime rate, so your payment rises when the Fed raises rates. Some lenders offer a fixed-rate option or let you convert a draw to a fixed rate. HELOC rates in 2025-2026 have generally ranged from about 8% to 10%.
You enter the repayment period: you can no longer draw funds and must pay both principal and interest. The payment steps up — for a $50,000 balance at 8.5%, from about $354/month (interest-only) to about $434/month (10-year draw, 20-year repayment), and much more if the repayment period is shorter. Plan for this jump in advance.
Usually yes — most HELOCs have no prepayment penalty. Paying extra during the draw period reduces your balance and all the future interest it would generate. Some HELOCs charge an early-termination fee if you close within the first 2-3 years, so check your agreement.
Since the 2017 tax law, HELOC interest is deductible only if the funds are used to buy, build, or substantially improve the home securing the loan, within the overall mortgage-debt limit. Interest on a HELOC used for debt consolidation or other purposes is not deductible. Consult a tax professional.
Yes. If your home value drops sharply or your credit deteriorates, a lender can freeze, reduce, or suspend your available credit — as many homeowners saw during the 2008 crisis. Keep good credit and don't rely on a HELOC as your only emergency fund.
Most lenders want a score of about 680-700 for the best rates. You may qualify with a score as low as 620, but expect a higher rate. Excellent credit (740+) earns the most competitive offers.
Typically 2-6 weeks from application to closing, including a credit check, home appraisal, title search, and underwriting. Some online lenders are faster than traditional banks.