Your first home starts with a plan
A practical guide to the numbers, the process, and your next big step.
Read the guideHow a HELOC works: borrowing, payments, and repayment
A home equity line of credit, or HELOC, is a revolving credit line secured by your home. Instead of receiving one lump sum, you can draw funds as needed within the agreement’s limits. It may suit expenses that arise in stages, such as a renovation, but borrowing against your home creates a repayment obligation and puts the property at risk if you cannot repay.
Understand the draw period and repayment period
During the draw period, you can access available credit under the lender’s rules. The required payment may cover interest only or include principal. Once the draw period ends, new borrowing stops and the remaining debt must be repaid according to the contract. Read the CFPB’s HELOC explanation for an overview of these stages.
This calculator illustrates an interest-only payment first, followed by a payment that repays the same balance over the repayment period you enter. It assumes no new draws or principal reductions before repayment begins. Your lender’s minimum-payment formula may produce different amounts, so use the estimate to understand the transition rather than as a substitute for a statement or repayment quote.
Why payments can increase
An interest-only payment does not reduce the debt. When principal must also be repaid, the required payment can rise even if the rate stays the same. For example, a $50,000 balance at an illustrative 8% annual rate costs about $333.33 per month in interest. Repaying that balance over 20 years at the same assumed rate requires about $418.22 per month. The difference is roughly $84.89, before fees or any rate changes.
HELOC rates are commonly variable. A change in the rate or additional borrowing can change the payment independently of the switch to repayment. This tool holds the entered rate constant; it does not predict future rates. Try a higher rate to test your budget, then check the agreement’s index, margin, adjustment rules, and rate limits. Fannie Mae’s HELOC guide explains how a credit line differs from other home equity borrowing.
Enter the amount borrowed, not unused credit
Credit line amount drawn means the outstanding amount you are modeling. A $100,000 approved limit does not mean you owe interest on $100,000 if you have drawn only $30,000. Enter $30,000 for that payment scenario. Approval and the available limit are separate from the payment estimate. Our home equity calculator can illustrate additional borrowing under a chosen loan-to-value assumption.
Compare fees and alternative ways to borrow
Check closing charges, annual fees, and any early-closure or inactivity fees. These can affect cost even when the initial payment appears low. The CFPB’s HELOC fee guide explains charges to review in the disclosures. This calculator excludes fees, and its Repayment-period interest figure excludes interest paid during the earlier draw period. It is not the total lifetime cost of the line.
If you need a defined lump sum and a predictable repayment schedule, compare a fixed-rate home equity loan using the second mortgage calculator. A cash-out refinance instead replaces an existing mortgage, which may change the cost of the entire outstanding balance. Compare actual offers and repayment terms rather than just their introductory payments.
Keep a repayment plan and a separate reserve
Consider whether you could manage the repayment-stage payment alongside your first mortgage and other expenses. Do not assume unused credit will always remain available: a lender may freeze or reduce a line in certain circumstances. The FTC’s home equity borrowing guide discusses this and the risks of securing debt against your home. Confirm the contract terms and seek individual guidance where needed; this calculator is a planning illustration, not an approval or personal recommendation.
