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Home equity planning

HELOC Payment Calculator

This HELOC payment calculator separates the interest-only draw-period payment from the principal-and-interest payment that can begin when borrowing ends. Enter the outstanding balance—not the unused credit limit—to see payment shock, total projected interest, a fully amortized schedule and what-if results at one and two percentage points above the APR you enter.

The editable 7.31% starting value is the Bankrate national average dated August 19, 2026. It is market context, not a quote. Use the current fully indexed APR, payment rule and term from your statement or HELOC disclosure.

Line-of-credit inputs

Estimate draw and repayment payments

Amount already drawn and not repaid

Checks the balance only; never used as principal

Replace the dated market average with your fully indexed APR

Use remaining years from today, not the original term

Enter 0 if the entire balance is due when draw ends

Model scope: constant APR, interest-only draw payments, no new draws, no principal prepayments, and standard monthly amortization after draw. Property tax, insurance, escrow and contract fees are excluded. Your agreement can use a different minimum-payment formula.

Your result

HELOC payment shock and projected cost

Interest-only draw payment$50,000.00 outstanding × 7.3% ÷ 12
$304.58
Payment increase at repayment30.3% above the modeled draw payment
$92.42
Draw-period interest10 remaining years with no new draws or principal payments
$36,550.00
Total projected interestDraw interest plus repayment interest; fees excluded
$81,831.85
Estimated repayment payment$397.01240 monthly payments at 7.3%

Educational principal-and-interest estimate. The lender's disclosure and current statement control.

Draw payment$304.58
Repayment payment$397.01
Total interest$81,831.85
Total projected paid$131,831.85

Variable-rate what-if snapshots

Current APR, plus one and two points

Each row reruns both formulas at the stated APR. It does not predict when or whether your rate changes, and it does not assume a universal cap. Read the index, margin, adjustment frequency, periodic limit and lifetime limit in your own disclosure.

ScenarioAPRDraw paymentRepaymentPayment shockTotal interest
Current APR7.3%$304.58$397.01$92.42$81,831.85
APR +1 point8.3%$346.25$427.92$81.67$94,250.26
APR +2 points9.3%$387.92$459.88$71.96$106,921.09
Repayment yearPaymentsPrincipalInterestEnding balance
1$4,764.09$1,147.02$3,617.08$48,852.98
2$4,764.09$1,233.73$3,530.36$47,619.25
3$4,764.09$1,327.00$3,437.09$46,292.25
4$4,764.09$1,427.32$3,336.77$44,864.93
5$4,764.09$1,535.23$3,228.87$43,329.71
6$4,764.09$1,651.29$3,112.80$41,678.42
7$4,764.09$1,776.12$2,987.97$39,902.29
8$4,764.09$1,910.40$2,853.69$37,991.89
9$4,764.09$2,054.82$2,709.27$35,937.07
10$4,764.09$2,210.17$2,553.92$33,726.90
11$4,764.09$2,377.26$2,386.84$31,349.65
12$4,764.09$2,556.98$2,207.12$28,792.67
13$4,764.09$2,750.28$2,013.81$26,042.39
14$4,764.09$2,958.20$1,805.89$23,084.19
15$4,764.09$3,181.84$1,582.25$19,902.35
16$4,764.09$3,422.39$1,341.71$16,479.96
17$4,764.09$3,681.12$1,082.98$12,798.84
18$4,764.09$3,959.41$804.68$8,839.43
19$4,764.09$4,258.74$505.35$4,580.70
20$4,764.09$4,580.70$183.40$0.00

Methodology

How the HELOC payment calculator works

Draw period: interest on the balance

An interest-only draw payment is balance × APR ÷ 12. The balance means funds actually borrowed, not the credit line’s ceiling. With no new draws or principal payments, that balance remains unchanged and monthly interest is constant. CFPB guidance makes clear that HELOC payment rules vary: this equation is appropriate only when the agreement permits an interest-only minimum.

Repayment period: principal plus interest

The fully amortizing payment is B × r ÷ (1 − (1+r)^−n), where B is the ending draw balance, r is APR divided by 12, and n is repayment months. Each row charges interest on the opening balance and sends the rest to principal. At 0%, payment is B ÷ n. The final row is corrected at full precision so a rounding artifact cannot leave phantom debt.

Worked calculation: a $50,000 line at 8.5%

  1. 1. The monthly rate is 8.5% ÷ 12 = 0.708333%.
  2. 2. Interest-only draw payment is $50,000 × 0.708333% = $354.17.
  3. 3. Amortizing that balance over 240 months gives $433.91 per month.
  4. 4. The transition adds $79.74, or about 22.5%, even if APR never changes.
  5. 5. Ten draw years plus twenty repayment years produce $96,638.79 projected interest under these static assumptions.

Borrower scenarios

HELOC payment examples

$50,000 at the August 2026 average

At 7.31%, a $50,000 balance produces a $304.58 interest-only payment. A 20-year repayment payment is $397.01, an increase of $92.42 or 30.3%. The result shows why a flat rate does not prevent payment shock when principal begins.

$100,000 with rate stress

A $100,000 balance at 7.31% costs $609.17 during an interest-only draw and $794.02 over a 20-year repayment. The stress table then recomputes at 8.31% and 9.31%; it does not simply mark the current payment up by one or two percent.

Shorter repayment after rates rise

A $75,000 balance at 9.31%, with 5 draw years and 15 repayment years, moves from about $581.88 to $774.59. The higher payment retires debt faster than a 20-year plan, but the immediate budget jump is more severe.

No repayment period: balloon balance

If $30,000 remains when draw ends and the agreement provides no amortizing repayment period, the output is not a fictional monthly installment. It is $30,000principal due, plus accrued interest and contract fees. CFPB warns that some HELOCs use this structure. A hoped-for refinance should not be treated as guaranteed.

United States context

HELOC disclosures, prime and payment risk

A U.S. HELOC is open-end credit secured by a dwelling. CFPB Regulation Z §1026.40 requires creditors to describe draw and repayment terms, fees, the method used to determine the APR, the index and margin for a variable plan, periodic limitations, maximum rate and payment examples. Separate examples are required when draw and repayment payments are determined differently. That is why a generic “loan payment” result is incomplete: the borrower needs to see the two phases separately and compare them with the actual disclosure.

Rate context must be dated. The Federal Reserve H.15 release dated August 24, 2026 reports a bank prime loan rate of 6.75% for August 17–21. Prime is one of several rates banks use in pricing credit; it is not automatically the APR on a consumer’s line. Bankrate’s surveyed national HELOC average was 7.31% on August 19, 2026. Both figures are benchmarks. A borrower’s index, lender margin, discount, cap and adjustment date control.

The collateral raises the stakes. CFPB warns that a borrower who cannot repay a HELOC on schedule could lose the home. OCC interagency guidance identifies substantial payment shock when principal amortization begins near the end of draw. Test the higher repayment figure against income and essential spending before the transition, and contact the servicer early if the projected amount does not fit. This calculator is educational and does not assess underwriting, hardship options or legal rights.

Avoidable errors

Common HELOC mistakes and edge cases

  • Using the limit as principal. Interest applies to the outstanding balance. Unused availability does not belong in the payment formula.
  • Treating a snapshot as a forecast. A variable rate, new draw or principal payment changes the path. Recalculate whenever the statement changes.
  • Assuming every draw is interest-only. Some agreements require principal or a special minimum. Read the plan’s payment provision.
  • Ignoring a teaser rate. An introductory APR may expire. Enter the fully indexed current APR and review when the next adjustment occurs.
  • Hardcoding a universal rate cap. Regulation Z requires plan-specific disclosure. The stress cases are not statements about your cap.
  • Overlooking a balloon. A plan with no installment phase can demand the entire principal at draw end. Enter zero repayment years to see that warning.
  • Forgetting daily accrual. APR divided by twelve is a monthly estimate; a servicer using actual days and transaction dates can report a different amount.
  • Mixing fees with interest. Annual, transaction, appraisal, closing, early-closure and conversion fees must be added separately when comparing offers.
  • Assuming extra payments are irreversible. Principal may restore available credit during draw, but freezes, closures and redraw rules depend on the contract.
  • Letting cent rounding create phantom debt. This schedule calculates at full precision and corrects the last row to end at exactly $0.00.

Decision framework

Related concepts before using home equity

HELOC versus home equity loan

A HELOC is revolving credit and is commonly variable; a home equity loan generally advances a lump sum with scheduled installments. Compare flexibility, rate risk, fees and total cost—not only the first payment.

Combined loan-to-value

CLTV compares first-mortgage debt plus HELOC exposure with property value. It may affect approval and available credit, but it does not replace outstanding balance in the payment calculation.

Amortization

Amortization assigns part of each payment to interest and the rest to principal until the balance reaches zero. Explore the same mechanics for a standard installment debt with the existing loan calculator.

Points and up-front costs

Fees can change the economic break-even even when they do not appear in the monthly principal-and-interest result. The existing mortgage points calculator illustrates how an up-front charge trades against a lower rate.

Plan comparison

How common HELOC payment structures differ

Structure summary based on CFPB HELOC guidance and Regulation Z payment categories. The agreement, not this table, defines an individual plan.
StructureDuring drawAfter drawPrimary risk
Interest-only drawInterest on outstanding balancePrincipal plus interest over a stated termPayment shock when amortization starts
Principal-including drawContract minimum includes some principalRemaining balance follows contract scheduleGeneric interest-only tools understate the draw bill
Balloon planOften a low minimum during drawEntire outstanding balance can become dueRefinancing may be unavailable at maturity
Fixed-rate conversionConverted segment has fixed installmentSegment amortizes on its own termFees and multiple segments complicate totals

Questions homeowners ask

HELOC payment calculator FAQ

How is a HELOC payment calculated during the draw period?

For an interest-only plan, the monthly estimate is outstanding balance × APR ÷ 12. A $50,000 balance at 8.5% therefore produces $354.17 for a 30-day-style monthly estimate. The credit limit is not part of that formula because unused capacity has not been borrowed. Your agreement may instead require principal, a balance percentage, a fixed minimum or fees, and a daily-interest statement can differ slightly from APR divided by 12.

Why does a HELOC payment rise when the draw period ends?

An interest-only draw payment does not reduce principal. When repayment begins, the payment must cover current interest and retire the entire balance within the remaining term. On $50,000 at 8.5%, the modeled payment rises from $354.17 interest-only to $433.91 over 20 years. The OCC calls this transition a potential source of substantial payment shock. A shorter repayment term or higher APR makes the increase larger.

Should I enter the HELOC balance or the credit limit?

Enter the outstanding balance—the money already drawn and not repaid. A $100,000 line with a $35,000 balance accrues interest on about $35,000, not $100,000. The optional credit-limit field on this page is only a validation aid. It prevents a balance greater than the stated limit, but it never increases the payment. Check the latest statement because recent draws, payments and posted interest can move the balance.

Are HELOC draw-period payments always interest-only?

No. The CFPB booklet says some plans permit interest-only payments while others require some principal, a percentage of balance, a fixed minimum or another contract formula. This calculator intentionally models the common interest-only structure so the transition is visible. If your disclosure gives a different minimum-payment rule, use the lender’s figure for the draw phase and use this page only to examine a standard fully amortizing repayment scenario.

What happens if my HELOC rate rises by 1 or 2 percentage points?

Both phase payments must be recalculated from the higher rate; adding 1% to the payment would be wrong. The stress table recomputes the interest-only amount and the amortizing repayment amount at current APR, APR +1 point and APR +2 points. These are what-if snapshots, not forecasts. Regulation Z requires the creditor to disclose the plan’s own index, margin, adjustment frequency, periodic limits and maximum rate.

What is prime, and is it my HELOC interest rate?

Prime is a benchmark rate that banks use in pricing some credit. Federal Reserve H.15 reported 6.75% for August 17–21, 2026. A HELOC may be priced as an index plus a lender margin, so the borrower APR can be above or below a market average and may change on a different schedule. Enter the fully indexed current APR from your statement or disclosure rather than substituting the Fed prime figure.

How long do HELOC draw and repayment periods last?

Terms are contractual. The CFPB gives a 10-year draw as a common example and says repayment may often run 10 or 20 years; its booklet also discusses 10- or 15-year repayment structures. Some plans renew, some convert to installments and some require the outstanding balance immediately. Enter the remaining years, not the original term, when estimating cash flow from today forward.

Can I pay principal during the HELOC draw period?

Many plans allow it, and reducing the balance can lower current interest and the later repayment payment. This model assumes no principal prepayment during draw so it does not overstate the ending balance reduction. Confirm whether a principal payment restores available credit, whether the line may later be frozen, how the servicer applies extra funds, and whether a minimum balance or transaction amount applies.

Can a HELOC require a balloon payment?

Yes. CFPB guidance warns that some agreements require the full outstanding balance when the draw period ends instead of providing an amortizing repayment term. Enter 0 repayment years to model that structure: the tool reports the balance due rather than inventing an installment payment. Refinancing is not guaranteed, and failure to repay debt secured by a home can put the property at risk.

Why can my lender statement differ from this HELOC estimate?

A statement may use daily interest, the exact number of days in the billing cycle, a changing index, transaction dates, a contractual minimum, principal draws or payments, and annual or transaction fees. This page uses APR ÷ 12, a constant balance during draw, no new activity and a standard monthly amortization after draw. Use the estimate to compare scenarios, then rely on the statement and agreement for the amount due.

Does a HELOC payment include property tax or homeowners insurance?

No. The outputs are HELOC principal and interest only. Unlike some first-mortgage payments, a HELOC bill generally does not combine property tax and homeowners insurance in an escrow amount. Appraisal, application, annual, transaction, early-closure and fixed-conversion fees are also excluded. List those costs separately when comparing a HELOC with a home equity loan, cash-out refinance or unsecured loan.

How should a fixed-rate HELOC conversion be modeled?

A single converted segment can be modeled as a separate amortizing balance using its fixed APR and remaining term. Keep the variable revolving balance separate because its rate and minimum may follow different rules. If several segments exist, calculate each one independently and add their payments. Your servicer’s conversion fee, minimum segment amount and ability to redraw are contract terms outside this calculator.

Authoritative sources

Informational estimate only. This calculator is not financial, legal, tax or lending advice and does not offer or approve credit. It models one common interest-only-draw and fully-amortizing-repayment structure. Actual daily accrual, changing rates, minimum-payment rules, transactions, fees, rounding and fixed-rate segments can change the amount due. Because a HELOC is secured by a home, inability to repay can put the property at risk.

Published by Kalcify · Last updated

Calculators are built against primary sources — government tax authorities (IRS, HMRC, CRA, ATO) for finance and the World Health Organization for health metrics. Updated when rates or rules change. View methodology and data sources.

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