HELOC Payment Calculator

What Will Your HELOC Payment Be?

HELOC payments change dramatically between the draw period and repayment period, and fluctuate with interest rate changes throughout both phases. Enter your credit line details in the calculator above to see both the interest-only draw-period payment and the fully amortized repayment-period payment. The gap between these two numbers is the "payment shock" that catches many borrowers unprepared when their HELOC transitions from the low-payment draw phase to the higher-payment repayment phase.

HELOC Payment Reference at Common Balances

At 8.5% interest-only: $25,000 drawn = $177/month. $50,000 = $354. $75,000 = $531. $100,000 = $708. $150,000 = $1,063. Amortized over 15 years at the same rate: $25,000 = $246 (+$69). $50,000 = $492 (+$138). $75,000 = $738 (+$207). $100,000 = $984 (+$276). $150,000 = $1,476 (+$413). The amortized payment is 39% higher than IO at every balance level. This consistent 39% jump (at 8.5%, 15-year amortization) means a borrower comfortable at $708 IO on $100,000 must handle $984 when repayment begins - an increase of $276/month that is not optional.

How Do Rate Changes Affect Your HELOC Payment?

A $75,000 balance IO payment at different rates: at 6%: $375. At 7%: $438. At 8%: $500. At 9%: $563. At 10%: $625. At 11%: $688. Each 1% increase adds $62.50/month ($750/year). If rates rise 3% over your draw period: payment increases $187.50/month ($2,250/year) without borrowing a single additional dollar. During 2022-2023, HELOC rates rose approximately 5% as the Fed tightened monetary policy. Borrowers with $75,000 balances saw IO payments jump from $250/month (at 4%) to $531 (at 8.5%) - a $281/month increase entirely from rate changes. Budget for rate increases when taking a HELOC by stress-testing your budget at 2-3% above the current rate.

Paying Down Principal During the Draw Period

Every dollar paid above the IO minimum goes directly to principal reduction. On a $60,000 balance at 8.5%: IO minimum $425. Paying $600/month ($175 extra): after 3 years, balance drops to $52,450. After 5 years: $43,650. The lower balance at repayment-period start produces a lower amortized payment and less total interest over the line life. A borrower paying $600 during the draw period faces a $414 amortized payment (15 years on $43,650) instead of $590 (on the original $60,000). The $175/month extra during the draw period produces a $176/month lower payment during repayment - the extra payments essentially pay for themselves through the reduced future obligation.

HELOC Payment vs Mortgage Payment: Side by Side

A homeowner with a $1,800/month first mortgage payment adding a $50,000 HELOC at 8.5%: draw period: total housing payment $1,800 + $354 IO = $2,154. Repayment period: $1,800 + $492 amortized = $2,292. The HELOC adds 20-27% to the monthly housing cost. On $6,000 gross monthly income, the housing ratio jumps from 30% (mortgage only) to 36-38% (mortgage + HELOC). This elevated ratio may not cause immediate distress but reduces financial flexibility for savings, emergencies, and other obligations. Evaluate whether your income comfortably supports the combined payment at the higher repayment-period level before drawing.

Minimum Payment Traps and Long-Term Cost

Making only IO payments for the entire 10-year draw period on $75,000 at 8.5%: total interest paid during draw period = $63,750. Balance at repayment start: still $75,000. Repayment over 15 years: $738/month, $57,840 additional interest. Total interest over 25 years: $121,590. Compare: paying $1,000/month during the draw period (above the $531 IO minimum): balance at draw-period end = $17,800. Repayment over 15 years: $175/month, $13,700 additional interest. Total interest: $77,500. The $469/month extra during the draw period saves $44,090 in total interest and produces a dramatically lower repayment-period payment ($175 vs $738).

HELOC Payment During Financial Hardship

If you cannot make HELOC payments: contact the lender immediately to discuss options. Some lenders offer temporary forbearance (reduced or paused payments for 3-6 months), loan modification (extended term to lower payment), or conversion to a fixed-rate term loan. Missing payments on a HELOC is a secured debt default - after sustained non-payment, the lender can foreclose, though this typically follows months of missed payments and attempts at resolution. The HELOC is subordinate to the first mortgage, meaning in foreclosure the first mortgage is paid first. This subordinate position makes lenders more willing to negotiate HELOC modifications because they recover less in foreclosure than first-lien holders.

Planning for the Draw-to-Repayment Transition

Calculate your repayment-period payment today, even if the transition is years away. If the amortized payment exceeds your comfortable budget: begin making principal payments now to reduce the balance. Set a target balance for the transition date that produces an affordable amortized payment. If you are 3 years from the end of the draw period with $80,000 outstanding: paying $1,300/month (above the $567 IO) reduces the balance to $54,000, producing a $529 amortized payment instead of $784. Alternative: refinance the HELOC into a new HELOC (restarting the draw period) or a fixed-rate home equity loan before the transition. Each option has costs and benefits, but the worst strategy is ignoring the transition and being surprised by the payment increase.

Frequently asked questions