HELOC Payment Calculator — Home Equity Line of Credit

How HELOCs Work

A Home Equity Line of Credit (HELOC) is a revolving credit line secured by your home's equity. Think of it as a credit card backed by your house. You're approved for a maximum amount (based on your equity), and you can draw from it as needed during the"draw period" — typically 5-10 years.

During the draw period, most HELOCs require only interest-only payments on the amount you've borrowed. If you have a $100,000 HELOC at 8.5% but have only drawn $30,000, your monthly payment is just $212.50 ($30,000 × 8.5% / 12). You can draw more, pay it down, and draw again — just like a credit card.

After the draw period ends, you enter the"repayment period" (typically 10-20 years). No more draws allowed. Your balance is now amortized like a regular loan — principal and interest payments that fully pay off the balance by the end of the repayment period. This transition is where payment shock hits: a $50,000 balance at 8.5% with interest-only payments of $354/month suddenly becomes $434/month (10-year repayment) or $391/month (20-year repayment).

Variable Rate Risk: Most HELOCs have variable rates tied to the prime rate (currently 8.5% as of 2025). When the Fed raises rates, your HELOC rate increases within 1-2 billing cycles. During 2022-2023, HELOC rates jumped from 4-5% to 8-9% — nearly doubling monthly payments for many borrowers. Some HELOCs offer a fixed-rate conversion option (locking part of your balance at a fixed rate), which provides some protection against rate increases.

How Home Equity Loans Work

A home equity loan (sometimes called a"second mortgage") gives you a lump sum at a fixed interest rate, repaid over a set term (typically 5-30 years). It's simple: you borrow $50,000 at 8% for 15 years, your payment is $478/month, and it never changes. No draw periods, no variable rates, no payment shock.

Home equity loans typically carry rates 0.5-1% higher than HELOCs because you're getting rate certainty. The lender bears the interest rate risk instead of you. For many borrowers, this premium is worth it for the predictability.

When to Choose a HELOC

Choose a HELOC when: you need funds over time, not all at once (home renovation in phases, recurring college tuition payments), you want to minimize interest by only borrowing what you need when you need it, you're comfortable with variable rate risk (or rates are likely to decrease), and you want the flexibility to draw, repay, and redraw during the draw period.

Common HELOC uses: home renovations (draw as contractors bill you), emergency fund backup (approved but unused HELOC costs nothing), bridging expenses during job transitions, investment property down payments, and business startup costs.

When to Choose a Home Equity Loan

Choose a home equity loan when: you need a specific, known amount all at once (debt consolidation, single large purchase), you want payment certainty (fixed rate = fixed payment for the life of the loan), rates are low and likely to rise (lock in today's rate), and you're risk-averse and want predictable budgeting.

Common home equity loan uses: debt consolidation (paying off high-interest credit cards), major one-time home improvement (new roof, kitchen remodel), large medical expenses, and buying a second property.

The Risk Both Share

Both HELOCs and home equity loans use your home as collateral. This means if you default, the lender can foreclose — you could lose your home. This is fundamentally different from unsecured debt like credit cards, where default damages your credit but doesn't risk your housing. Never borrow against your home for discretionary spending, vacations, or consumer purchases. The risk-reward is wildly unfavorable.

The Draw Period: Years 1-10

During the draw period, your HELOC functions like a revolving credit line. You can borrow up to your approved limit, make payments to reduce the balance, and borrow again. Most lenders provide a checkbook or debit card for convenient access. Minimum payments during this period are typically interest-only.

Here's the trap: interest-only payments feel manageable but you're not reducing your balance at all. If you draw $80,000 at 8.5% and make only minimum interest payments for 10 years, you'll pay $68,000 in interest AND still owe the full $80,000 when the repayment period starts. That's $68,000 in payments with zero progress on the debt.

Smart HELOC management during the draw period means: only drawing what you genuinely need (not treating it as free money), making principal payments when possible (even small amounts help), tracking your balance regularly, and preparing for the repayment period transition. Some borrowers set up automatic payments above the interest-only minimum to ensure they're making progress.

A $100,000 HELOC at 8.5% has an interest-only payment of $708/month. If you add just $200/month in principal payments ($908 total), after 10 years you'll owe $76,000 instead of $100,000 — reducing your repayment period payment by about $90/month. Small principal payments during the draw period compound significantly over time.

The Repayment Period: The Payment Shock

When the draw period ends, everything changes. You can no longer borrow from the line. Your outstanding balance is converted to an amortizing loan, and you make principal + interest payments for the remaining term (typically 10-20 years). This transition is where many borrowers get caught off guard.

Example: $80,000 balance at 8.5% rate. Draw period payment (interest-only): $567/month. Repayment period payment (P&I over 20 years): $696/month — a 23% increase. If the repayment period is 10 years: $991/month — a 75% increase. Some HELOCs have shorter repayment periods of just 5 years, which creates even more dramatic payment increases.

The worst-case scenario: you drew the maximum during a low-rate environment, rates then increased significantly, AND the draw period ended. A $100,000 balance that cost $333/month at 4% interest-only during the draw period could become $1,200+/month in a 10-year repayment at 9%. That's a 260% payment increase — potentially devastating for an unprepared borrower.

Strategies for Managing the Transition

Budget for repayment period payments from day one. When you open a HELOC, calculate what your payment would be during the repayment period and make sure your budget can handle it. If it can't, don't borrow that much. Pay down principal during the draw period to reduce the eventual repayment payment. Set a target: pay off at least 20-30% of your draw period balance before repayment starts.

Consider refinancing before the repayment period hits. If you have sufficient equity, you can refinance the HELOC into a new HELOC (resetting the draw period), a home equity loan (fixing the rate), or fold it into a cash-out mortgage refinance. Each option has costs, so run the numbers. Some lenders offer a draw period extension — ask about this option 6-12 months before your draw period ends.

If you're already in the repayment period and struggling, contact your lender immediately. Many offer hardship programs, modification options, or extended repayment terms. Ignoring the problem leads to default, which leads to foreclosure. Your home is on the line — act early.