HELOC Payoff Acceleration Calculator
Most HELOCs have a 10-year draw period followed by amortization. Adding extra principal during the draw period can cut total interest by tens of thousands of dollars and shorten payoff by 5-10 years.
| Current balance | — |
| Monthly payment (min + extra) | — |
| Months to payoff (accelerated) | — |
| Total interest (accelerated) | — |
| Total interest (minimum only) | — |
| Interest saved with extra payments | — |
A HELOC paid only at minimum interest-only payments during the 10-year draw period leaves the full principal due when amortization begins, often doubling your payment overnight. Adding even a small extra principal payment each month during the draw period can save tens of thousands of dollars in interest and finish payoff years earlier. This calculator shows accelerated vs minimum-only side by side.
Why Extra Principal Matters on HELOCs
HELOC rates are almost always variable, tied to Prime + a margin. Each rate hike raises your interest cost on the entire balance. By reducing principal aggressively during the draw period, you shrink the balance that variable rates can attack. Most HELOCs allow unlimited prepayment without penalty, making this a no-cost strategy. A $50,000 HELOC at 8.5% with $500/month extra principal saves around $25,000 in lifetime interest and finishes 7+ years earlier than minimum-only.
Payoff Strategy Steps
(1) Stop new draws once your payoff plan begins — every new draw resets your goal. (2) Automate the extra payment as a separate principal-only transfer so it isn't applied to next month's interest. (3) Recheck APR quarterly — if rates fall, accelerate further; if they rise, hold steady. (4) Compare refinance options: a fixed home-equity loan may beat a variable HELOC once you stop using the credit line. Confirm there is no prepayment penalty before paying off in full.
Last updated May 2026. Sources: CFPB Owning a Home.