See your max credit line, both phase payments, and the payment shock most lenders don't warn you about.
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A Home Equity Line of Credit (HELOC) is a revolving credit line secured by your home's equity. It has two phases: a draw period (typically 10 years) where you can borrow and make interest-only payments, and a repayment period (typically 20 years) where you must repay principal plus interest.
Payment shock is the sudden jump in monthly payment when a HELOC transitions from the draw period to the repayment period. Interest-only payments of $150/month can become full amortizing payments of $450/month or more — often catching borrowers off guard a decade into the loan.
Most lenders allow you to borrow up to 80-85% of your home's value minus your existing mortgage balance. On a $500,000 home with a $300,000 mortgage, you could typically access $100,000-$125,000 in HELOC funds.
A home equity loan gives you a lump sum with a fixed rate and payment — predictable and best for one-time expenses. A HELOC is a flexible line of credit with a variable rate — best for ongoing projects or emergency reserves. Choose based on whether you need flexibility or predictability.
Under current tax law, HELOC interest is deductible only if the funds are used to buy, build, or substantially improve the home that secures the loan. Using a HELOC for debt consolidation, vacations, or other purposes generally does not qualify. Consult a tax professional for your specific situation.
If you cannot afford the repayment period payment, options include refinancing the HELOC into a home equity loan with a longer term, refinancing into your primary mortgage, selling the home, or negotiating modified terms with the lender. Because the HELOC is secured by your home, foreclosure is a real risk if payments are missed.
Most lenders require a minimum 620 credit score, though pricing improves meaningfully at 740+ and best rates typically land at 800+. Some HELOC specialists — Spring EQ, Figure — will work with scores in the 580–620 range when compensating factors are strong. Below 580, options narrow considerably; a home equity loan or a credit-building period before applying is usually the better path.
Yes, in virtually all cases. Most HELOCs have no prepayment penalty, meaning the balance can be paid down at any time without fees. A small number of lenders charge early-closure fees if the line is closed within the first 2–3 years — those show up as "early termination fee" or "account closing fee" in the disclosures and are worth scanning for before signing.
Under current IRS rules (post-2017 TCJA), HELOC interest is deductible only when the borrowed funds are used to "buy, build, or substantially improve" the home securing the loan. Using a HELOC to pay off credit cards, fund tuition, or cover living expenses does not qualify for the deduction. A tax professional is the right source for applying this to a specific situation — this isn't tax advice.
A HELOC is a second mortgage (the original loan stays in place) with a variable rate and revolving credit. A cash-out refinance replaces the existing mortgage with a new, larger loan — typically at a fixed rate — and hands over the difference in cash. Cash-out refi usually has higher closing costs but offers rate certainty. HELOCs close faster and cheaper but carry variable-rate risk and the repayment-phase transition.
Yes. A HELOC is secured by the home. If payments stop, the lender can foreclose. This is the core risk that separates home equity products from unsecured borrowing like credit cards and personal loans — the house is collateral, which is why rates are lower and why the consequences of default are severe.
Traditional lenders typically take 2–6 weeks from application to funding — appraisal, title work, and underwriting all need to clear. Digital-first lenders like Figure and Aven market sub-week funding for qualified borrowers by using automated property valuation models and streamlined underwriting. Actual timelines depend on property complexity and documentation responsiveness.
Many HELOCs close with no out-of-pocket costs — the lender covers them in exchange for a minimum draw at closing or a commitment to keep the line open for 2–3 years. Others charge $200–$500 for appraisal and processing. The APR disclosure, which includes fees, is the cleanest apples-to-apples comparison between lenders.
Lenders reserve the right to freeze or reduce available credit if a home's value drops enough that CLTV moves outside their limits. This happened widely during the 2008–2009 housing downturn — HELOCs were frozen even for borrowers current on payments. Already-drawn balances remain the borrower's responsibility, but further access to the line can be cut off with short notice.
Most lenders cap your combined loan-to-value (CLTV) at 85% of your home's appraised value. That means your mortgage balance plus the HELOC can't exceed 85% of what your home is worth. For a $450,000 home with a $250,000 mortgage, the math is ($450,000 × 0.85) − $250,000 = $132,500 in available credit. Some lenders go up to 90% CLTV, but rates and fees get noticeably worse above 80%.
A HELOC has two distinct phases. The draw period (usually 10 years) is when you can borrow against the line. Most lenders require interest-only payments during this phase — which is why the payment looks so affordable at first. The repayment period (usually 10–20 years after that) is when the line closes and you have to pay back the principal plus interest at whatever the current variable rate is. This calculator shows both so you see the full picture, not just the draw-period number.
During the draw period, your monthly payment is just the interest on your outstanding balance. The formula is balance × APR ÷ 12. On a $60,000 balance at 8.5% APR, that's about $425/month — no principal reduction. This is genuinely cheap money month-to-month, which is both the appeal and the trap: the principal isn't going anywhere.
The switch from draw to repayment is what catches people off guard. Your interest-only payment converts to a fully amortizing payment that pays down the principal over the remaining term (often 20 years) — at whatever the variable rate is on day one of repayment. If rates have risen during your draw period (which happens), the combined effect can double or triple the monthly payment overnight. The "payment shock" callout above shows you exactly what that looks like for your numbers, including an optional +2% stress test modeling a realistic rate environment.
HELOCs fit some borrowing situations well and fit others poorly. The pattern across the three scenarios below isn't a recommendation — it's a description of how the math tends to work out depending on where a borrower lands on equity cushion, use case, and income stability.
The same features that make HELOCs appealing — low starting payment, revolving access, lower rates than unsecured borrowing — also create the risks that trip people up. Both sides are worth seeing clearly before signing.
Lenders weigh four factors when underwriting a HELOC: credit score, combined loan-to-value (CLTV), debt-to-income ratio (DTI), and proof of stable income. Typical floors are a 620 credit score, CLTV under 85%, DTI under 43%, and two years of verifiable income. Rate pricing sits on top of those minimums and depends heavily on where the credit score lands.
Best available rates — typically prime flat or prime + 0.25%. Most major lenders approve up to 90% CLTV at this tier. Fixed-rate advance options (converting portions of the line to a locked rate) are commonly offered. Funding usually takes 2–5 weeks through traditional lenders and under a week through some digital-first lenders.
Rates typically prime + 0.25% to 0.75%. Standard 85% CLTV cap at most lenders, with a feature set similar to the exceptional tier. A handful of digital lenders — Figure and Aven, for example — advertise funding in under a week for borrowers in this range.
Rates typically prime + 0.75% to 1.5%, with CLTV capped at 80–85% depending on lender. Fixed-rate advance options are sometimes more limited. Credit unions frequently price below banks at this tier, making three-way comparisons (bank, credit union, digital) worthwhile before committing.
Rates typically prime + 2.5% to 4%, with CLTV usually capped at 80%. Some major lenders won't approve below a 680 score, which narrows options to HELOC specialists like Spring EQ, credit unions, and regional banks. Documentation is typically heavier and approval timelines longer. A home equity loan (fixed rate) is sometimes easier to qualify for than a HELOC at this tier.
HELOCs generally aren't available below a 580 score. A small number of specialty lenders consider applications in the 580–620 range when compensating factors are strong — low CLTV, high income, long employment — but rates start at prime + 5% or higher. Waiting to build credit past 620 before applying typically saves more than the wait costs.
Both products borrow against home equity, but the mechanics differ in ways that matter. A HELOC is a revolving line of credit with a variable rate, interest-only payments during the draw period, and flexibility to borrow repeatedly up to the limit. A home equity loan is a lump-sum second mortgage with a fixed rate and a fixed monthly payment from day one.
The fit usually comes down to two questions: does the money need to go out all at once or over time, and does rate certainty matter more than the lowest possible starting payment? HELOCs win on flexibility and low initial payments. Home equity loans win on predictability — rate and payment are locked for the life of the loan, which matters most when consolidating debt or funding a one-time, known expense.
| Feature | HELOC | Home equity loan |
|---|---|---|
| Rate type | Variable (prime + margin) | Fixed |
| Disbursement | Draw as needed during draw period | Lump sum at closing |
| Payment structure | Interest-only during draw, P+I in repayment | Fixed P+I from day one |
| Payment during draw | Lower (interest only) | Higher (fully amortizing) |
| Payment risk | Variable rate plus phase transition | None — payment is fixed |
| Best fit | Ongoing or uncertain expenses, flexibility | One-time known expense, predictability |
| Typical term | 10-year draw + 10–20 year repayment | 5–30 years fixed |
The patterns below aren't obscure edge cases — they're the recurring reasons HELOC borrowers run into trouble. Understanding them before signing tends to matter more than rate-shopping within a few tenths of a percent.
Lenders advertise the interest-only payment because it's the smaller, friendlier number. Borrowers often budget against that figure for a decade without accounting for the transition. The repayment-phase payment is the one that actually governs long-term affordability — running the math on both is what separates a working plan from a surprise in year 11.
The math works best when borrowed funds produce value that offsets the interest cost — home improvements that add equity, education that raises income, a business investment with returns above the rate. Funding vacations, vehicles, or daily expenses means paying interest to consume, which becomes especially expensive once the repayment phase starts.
Borrowing right up to the lender's cap leaves no room if home values drop 5–10%, which is historically unremarkable during a downturn. When that happens, the lender can freeze or reduce the line, and combined housing debt can slip into underwater territory. Holding CLTV under 80% is the common pattern among borrowers who don't get caught by this.
HELOCs are tied to prime, which moves with the Fed's target rate. Historically, 2% swings over a 10-year span are normal, not catastrophic. Budgeting against today's rate without modeling a realistic rate environment is how borrowers end up shocked when the payment rises — and it's why a stress test is built into this calculator.
One pattern in well-managed HELOCs is paying more than the interest-only minimum during the draw period, reducing principal before the repayment phase hits. The more common pattern is paying only the minimum and carrying the original principal into repayment, where the amortizing payment lands with full force. A principal-paydown plan before day one of repayment is what separates the two outcomes.