HELOC Payoff Calculator

This HELOC payoff calculator works in the direction most calculators don't: instead of telling you what your minimum payment is, it tells you how to make the balance actually go away. Plan in either of two modes — enter the monthly principal you can afford and see your payoff date, or set a target payoff date and see the required monthly principal.

The reason a dedicated payoff tool matters: a HELOC's minimum payment during the draw period is interest-only, which means the minimum payment pays off nothing, ever. Every month you make only the required payment, you're renting the borrowed money at whatever the current variable rate is. A payoff plan converts that open-ended cost into a fixed, finite one.

Because HELOC rates float with prime, paying the balance down also reduces your exposure to rate hikes — a $500/month principal habit shrinks the balance the next increase applies to. If your draw period is ending soon and you're facing the repayment reset, model that transition with the Interest-Only HELOC Calculator; this tool is for beating the reset to the punch.

During the draw period, your lender bills interest on the current balance each month; anything you pay beyond that goes straight to principal. The calculator simulates it month by month:

Two useful consequences fall out of this structure. First, in "target date" mode the required monthly principal is simply your balance divided by the number of months — principal and interest are separate lanes on a HELOC, unlike an amortizing loan. Second, your total monthly outlay declines over time: as the balance falls, the interest portion shrinks while your principal amount stays fixed.

Worked example — $40,000 at 8.50%, $500/month principal:

• Payoff time: 80 months — 6 years 8 months
• First month's total payment: $283 interest + $500 principal = $783, declining every month after
• Total interest paid: about $11,500
• Interest over the same 80 months paying interest-only: about $22,700 — with the full $40,000 still owed at the end

That last comparison is the whole argument: the payoff plan costs roughly half the interest of standing still, and ends with a zero balance instead of a $40,000 one.

• Fixed monthly principal. The approach this calculator models. Treat the principal amount like a bill — automatic, non-negotiable. Because interest is billed separately and shrinks as you go, the plan gets easier over time, not harder.
• Lump sums first. On a variable-rate balance, a lump sum does double duty: it eliminates interest immediately and shrinks the balance future rate hikes apply to. Tax refunds and bonuses aimed at a HELOC beat the same money aimed at a low-rate fixed mortgage.
• Refinance to fixed, then attack. If rates are rising, converting the balance to a fixed-rate home equity loan locks the cost while you pay it down — model the fixed payment with our Home Equity Loan Payment Calculator. Many lenders also offer a fixed-rate lock option on a portion of an existing HELOC balance.

One caution before aggressive payoff: check whether your HELOC has an early closure fee. Prepaying principal is virtually never penalized, but closing the line entirely within the first 2–3 years sometimes triggers a fee of a few hundred dollars, since lenders recoup waived closing costs. Paying to zero while leaving the line open usually avoids it — and keeps the credit line available as an emergency reserve.