When your HELOC draw period ends, you will no longer be able to access your funds and the 10- or 20-year repayment period on your HELOC will begin. During this time, you will pay back the outstanding balance of borrowed funds in addition to interest. Because your minimum monthly payment will include both principal and interest, it is likely to increase significantly, and could increase even more if the variable rate goes up. It's important to anticipate this change and budget for your line of credit repayment period accordingly.