# HELOC Payment & Draw Calculator Simulate variable-rate HELOC payments, including interest-only draw period payments and later principal-and-interest repayment schedules. --- - **Canonical URL:** https://dothecalculation.com/calculators/home-equity-line-of-credit-heloc-calculator - **Category:** Real Estate & Property - **Publisher:** Do The Calculation (https://dothecalculation.com) - **Cost:** Free, no account or sign-up required - **Privacy:** Runs entirely in the browser; inputs are never sent to a server - **Methodology:** https://dothecalculation.com/methodology --- ## HELOC Payment & Draw Phase Calculator Model variable-rate HELOC payments during the interest-only draw period and principal-plus-interest repayment phase. - Draw phase interest-only payment calculations - Amortized principal & interest repayment calculations - Variable interest rate simulations ## Understanding the HELOC Structure A **Home Equity Line of Credit (HELOC)** is a revolving line of credit secured by your home equity. Unlike a standard home equity loan, a HELOC functions like a credit card: you borrow only what you need, pay it back, and borrow again. HELOCs consist of two distinct phases: 1. **Draw Period**: The initial phase (typically 5 to 10 years) where you can borrow funds. Payments are usually interest-only, based on the current balance and variable interest rate. 2. **Repayment Period**: The final phase (typically 10 to 20 years) where you can no longer draw funds. The remaining balance amortizes into monthly principal and interest payments. The math is formulated as follows: $$\text{Interest Rate} = \text{Variable Index Rate} + \text{Lender Margin}$$ $$\text{Draw Phase Monthly Payment (Interest-Only)} = \text{Current Balance} \times \frac{\text{Interest Rate}}{12}$$ $$\text{Repayment Phase Monthly Payment} = \text{PMT}\left(\frac{\text{Interest Rate}}{12}, \text{Repayment Months}, -\text{Balance}\right)$$ Because HELOCs have variable rates, payments can rise significantly if interest rates increase during the repayment phase. ## How to Use This Calculator Enter your HELOC credit limit and the balance you plan to draw, plus any annual fee your lender charges. Then set the draw period length (typically 5-10 years) and repayment period length (typically 10-20 years). Enter the variable index rate — usually the U.S. Prime Rate — and the lender's margin; the calculator adds them together for your effective interest rate. The result shows your interest-only monthly payment during the draw phase, your fully amortized principal-and-interest payment once repayment begins, and a year-by-year balance schedule you can expand to see the payoff timeline. ## Worked Example: A $100,000 HELOC with a $50,000 Draw Say you open a HELOC with a \(\$100,000\) credit limit, draw \(\$50,000\) against it, and your lender charges a variable index rate of 5.25% plus a 1.5% margin. $$\text{Interest Rate} = 5.25\% + 1.5\% = 6.75\%$$ $$\text{Draw Phase Payment} = \$50{,}000 \times \frac{0.0675}{12} = \$281.25\text{/month}$$ During a 10-year draw period at that interest-only payment, you'd pay roughly \(\$33,750\) in interest without reducing the \(\$50,000\) principal at all. Once the 15-year repayment phase begins, the balance amortizes into a payment of about \(\$442.45/\text{month}\), adding another \(\$29,642\) in interest over the repayment term — for total lifetime interest of roughly \(\$63,392\) plus \(\$1,250\) in annual fees over the full 25-year life of the line. This is exactly why paying down principal during the draw period, even though it isn't required, meaningfully lowers the total cost. ## Related Calculators A HELOC is one of several ways to tap home equity or restructure a mortgage. Compare it against a [Reverse Mortgage](/calculators/reverse-mortgage-payment-calculator) if you're 62 or older, or a full cash-out [Refinance](/calculators/refinance-calculator). Check your [Loan-to-Value Ratio](/calculators/loan-to-value-calculator) before applying, and see the [Biweekly Mortgage Payoff Calculator](/calculators/biweekly-mortgage-payoff-calculator) if your goal is paying down your primary mortgage faster instead. Before any of that, the [home equity calculator](/calculators/home-equity-calculator) shows your current equity, LTV, and realistic borrowing capacity at your lender's target ratio in one place. ## Frequently asked questions ### What is a HELOC? A HELOC (Home Equity Line of Credit) is a revolving line of credit secured by your home equity, allowing you to borrow, repay, and borrow again. ### How do interest-only payments work during the draw period? During the draw period, you only pay interest on the balance you borrow. You do not have to pay down the principal balance, resulting in low monthly payments. ### What happens when the HELOC enters the repayment phase? You can no longer borrow money. The remaining balance amortizes into monthly principal and interest payments over the repayment term, causing payments to rise. ### How are variable interest rates determined on a HELOC? HELOC rates are tied to a benchmark index (usually the U.S. Prime Rate) plus a lender margin (e.g., Prime + 1%). If the index rate rises, your HELOC rate and payment rise. ### What is a lifetime cap on a HELOC? A lifetime cap is the maximum interest rate that can be charged on a HELOC, typically capped around 18% under state lending laws. ### Can I pay off my HELOC principal early? Yes, most lenders allow you to pay down the principal balance during the draw period without penalty, which reduces your monthly interest-only payments. ### What is the maximum LTV allowed for a HELOC? Most lenders limit your total loan-to-value (CLTV) ratio to 80% or 85% of your home's appraised value, including your primary mortgage and HELOC. ### Are HELOC interest payments tax-deductible? Interest is only tax-deductible if the funds are used to buy, build, or substantially improve the home securing the loan, subject to IRS limits. ### What is the difference between a HELOC and a Home Equity Loan? A HELOC is a revolving line of credit with variable interest rates and interest-only draw payments. A Home Equity Loan is a lump-sum, fixed-rate loan with fixed monthly payments. ### What fees are associated with a HELOC? Common fees include upfront closing costs (appraisal, title search, recording fees), annual fees ($50 to $100), and transaction fees for draws. ## Related concepts - **Combined Loan-to-Value (CLTV)** — The sum of all mortgage balances on a property divided by its current market value, used to limit credit limits. - **Prime Rate** — The benchmark interest rate banks charge creditworthy corporate borrowers, the foundation of HELOC rates. - **Home Equity Loan** — A fixed-rate, closed-end loan that allows homeowners to borrow a lump sum against their equity. ## Related guides - [Mortgage Guide: Payment Formula, Costs, and PMI](https://dothecalculation.com/blog/finance/mortgage-guide) — Understand how mortgage payments work, what the DTC mortgage calculator includes, and how taxes, insurance, PMI, and loan term affect cost. - [Home Affordability: Budget, Formula, and Calculator](https://dothecalculation.com/blog/finance/home-affordability-analysis) — Estimate a home-price range from income, debt, down payment, rate, taxes, and insurance, then test costs the DTC model does not include. ## Related calculators - [Biweekly Mortgage Payment & Payoff Accelerator](https://dothecalculation.com/calculators/biweekly-mortgage-payoff-calculator) — Compare biweekly versus monthly mortgage payment schedules to calculate how much faster you pay off your loan and total interest saved. - [Mortgage Discount Points Break-Even Calculator](https://dothecalculation.com/calculators/mortgage-points-break-even-calculator) — Calculate the break-even timeline and total interest savings from paying upfront mortgage discount points to buy down your interest rate. - [HECM Reverse Mortgage Calculator](https://dothecalculation.com/calculators/reverse-mortgage-payment-calculator) — Estimate HECM reverse mortgage principal limits, available lump sum proceeds, and monthly tenure payment options for eligible homeowners. - [Seller Financing Amortization Calculator](https://dothecalculation.com/calculators/seller-financing-calculator) — Model owner-financed loan amortization schedules, balloon payments, and installment sale capital gains tax benefits for seller financing deals. - [Mortgage Calculator](https://dothecalculation.com/calculators/mortgage-calculator) — Calculate monthly mortgage payments including principal, interest, property taxes, PMI, and home insurance to budget your home purchase. - [Payment Calculator](https://dothecalculation.com/calculators/payment-calculator) — Find your exact monthly loan payment instantly from the loan amount, repayment term, and interest rate you enter into the tool. --- _This calculator is designed for educational and planning purposes only. Real estate valuations, operating expenses, tax treatment (including 1031 exchanges and installment sales), mortgage interest rates, and loan underwriting criteria vary widely by market, property type, credit profile, and local regulations. Always consult a licensed real estate broker, CPA, tax attorney, or financial advisor before making investment decisions._ --- _Source: [Do The Calculation](https://dothecalculation.com/calculators/home-equity-line-of-credit-heloc-calculator). Quote freely with attribution and a link to this page._