HELOC Payment and Draw-Period Calculator
Compare interest-only draw-period payments with amortizing repayment and a rate-stress scenario.
Official sources and scope
Rules and source methodology reviewed September 15, 2026.
Model the HELOC payment transition
A HELOC is revolving credit secured by a home. During the draw period, many plans base the minimum payment on the outstanding balance and may permit interest-only payments. When the draw period ends, borrowing stops and the balance commonly enters an amortizing repayment period, which can cause a substantial payment increase.
This calculator shows interest-only cost, an optional fixed principal payment, the balance entering repayment, the fully amortizing payment, remaining credit, and a user-selected rate increase. Actual index, margin, cap, floor, minimum draw, fees, fixed-rate options, and balloon terms come from the agreement.