Calculate home equity loan payments, maximum borrowing power, CLTV, true APR, amortization, extra-payment savings, DTI, tax estimates and home-renovation equity.
| Period | Beginning Balance | Payment | Principal | Interest | Ending Balance |
|---|---|---|---|---|---|
| Year 1 | $125,000 | $14,335 | $4,497 | $9,837 | $120,503 |
| Year 2 | $120,503 | $14,335 | $4,871 | $9,464 | $115,632 |
| Year 3 | $115,632 | $14,335 | $5,275 | $9,060 | $110,357 |
| Year 4 | $110,357 | $14,335 | $5,713 | $8,622 | $104,645 |
| Year 5 | $104,645 | $14,335 | $6,187 | $8,148 | $98,458 |
| Year 6 | $98,458 | $14,335 | $6,700 | $7,634 | $91,758 |
| Year 7 | $91,758 | $14,335 | $7,256 | $7,078 | $84,501 |
| Year 8 | $84,501 | $14,335 | $7,859 | $6,476 | $76,642 |
| Year 9 | $76,642 | $14,335 | $8,511 | $5,824 | $68,131 |
| Year 10 | $68,131 | $14,335 | $9,217 | $5,117 | $58,914 |
| Year 11 | $58,914 | $14,335 | $9,982 | $4,352 | $48,932 |
| Year 12 | $48,932 | $14,335 | $10,811 | $3,524 | $38,121 |
| Year 13 | $38,121 | $14,335 | $11,708 | $2,627 | $26,412 |
| Year 14 | $26,412 | $14,335 | $12,680 | $1,655 | $13,732 |
| Year 15 | $13,732 | $14,335 | $13,732 | $602 | $0 |
Calculate home equity loan payments, maximum borrowing power, combined loan-to-value (CLTV), true APR, two-phase amortization, extra-payment savings, debt-to-income (DTI) qualification readiness, IRS tax deductibility estimates, and renovation value-add equity.
A home equity loan calculator estimates how much you may be able to borrow against the equity in a property and models the monthly payment for a fixed-rate second mortgage. The calculator combines the home's market value, existing first-mortgage balance, selected CLTV limit, requested second-loan amount, interest rate, loan term, and closing-cost assumptions.
This is different from a HELOC. A home equity loan is generally modeled as a fixed lump-sum second mortgage with a defined repayment schedule, while a HELOC is a revolving line that may have a variable rate and separate draw and repayment phases. Users comparing those structures can use the Home Equity Loan Calculator alongside the HELOC Calculator to see how the payment structure changes under the same equity assumptions.
A calculator result is a mathematical scenario, not a lender commitment. Actual credit limits, interest rates, underwriting criteria, appraisal valuations, fees, and approval requirements vary by lender and individual borrower circumstances.
Follow these sequential steps to evaluate your second mortgage borrowing options:
The calculator's core borrowing-power formula begins with the maximum allowable total debt permitted by the selected CLTV cap:
For the validated baseline: a $500,000 home with a $275,000 first mortgage and an 80% maximum CLTV limit supports up to $400,000 of combined debt ($500,000 × 80%). Subtracting the $275,000 first mortgage leaves a maximum borrowable second mortgage of $125,000. The resulting current first-mortgage LTV is 55.0%, the post-loan CLTV is 80.0%, and protected unencumbered equity is 20.0% ($100,000).
Users who are still determining whether the overall property is affordable can also use the House Affordability Calculator to separate overall property purchase affordability from the narrower question of how much existing equity might support a second-lien loan.
Mode A calculates the payment and CLTV using a user-entered desired second-loan amount (e.g. $125,000). The calculator safely limits the funded loan to the maximum borrowing capacity permitted by the equity cap.
Mode B automatically uses the maximum second-loan amount supported by the selected CLTV limit and existing first-mortgage balance ($125,000 under the baseline).
Under the validated baseline, both modes converge on a $125,000 second mortgage when the requested loan equals the maximum permitted borrowing capacity.
The fixed monthly payment uses standard fixed-rate amortization mathematics:
For $125,000 at 8.0% over 15 years (180 months), the monthly payment is approximately $1,194.896, rounded to $1,195/month. Over the 15-year term, the borrower makes 180 payments totaling $215,081, resulting in $90,081 of total lifetime interest.
For a comprehensive principal-and-interest breakdown, users can also explore the Amortization Calculator to inspect monthly balance trajectories.
The current production engine contains a conditional check requiring positive interest. At a 0% interest rate, the calculator returns $0/month rather than the standard linear loan ÷ months division ($1,000/mo on $120,000 over 120 months).
This is an explicitly documented engine edge behavior from the master regression audit. It is preserved for exact mathematical consistency with the production runtime.
The calculator tracks beginning balance, payment, principal, interest, and ending balance across every period. For the validated Year 1 baseline:
The loan reaches exactly $0.00 ending balance at Month 180 / Year 15. The annual summary accumulates unrounded internal cash flows ($1,194.896 × 12 = $14,338.75 → $14,335), while individual monthly rows display integer-rounded values ($1,195 × 12 = $14,340), with both reconciling to the exact same terminal balance.
The calculator models a true APR that incorporates upfront closing costs rather than reporting the nominal interest rate alone:
The engine computes fee impact over the loan term. When comparing financing options, users should treat "true APR" as the calculator's modeled rate rather than assuming identity with a specific lender's Truth in Lending disclosure.
The borrower receives the full $125,000 proceeds, and the $2,500 closing cost is paid separately out of pocket.
The loan remains $125,000, but net cash received is reduced to $122,500 after deducting the closing fees.
The second-mortgage balance becomes $127,500, raising the monthly payment to $1,219/mo and post-loan CLTV to 80.5%.
The DTI module uses the proposed second-mortgage payment and existing monthly obligations to estimate the back-end debt-to-income ratio:
In the validated baseline ($8,500 gross income, $800 other debts, $1,195 second-mortgage payment), total monthly obligations equal $1,995, producing a back-end DTI of 23.5%. The engine classifies this as "Excellent DTI (Under 36% Benchmark)."
For a broader debt-burden analysis across all revolving and installment liabilities, contextualize this result with the Debt-to-Income (DTI) Ratio Calculator.
Lenders use credit scores and CLTV limits to establish underwriting eligibility. A 620–680 credit score represents a typical minimum qualifying threshold, while 740+ scores generally unlock the most competitive interest rates and highest borrowing caps (up to 85%–90% CLTV).
These tiers are educational benchmarks rather than statutory rules. Actual lender overlays, appraisal requirements, loan-to-value ceilings, and underwriting requirements vary by institution.
A fixed home equity loan is a lump-sum second mortgage with a fixed repayment schedule, whereas a HELOC is a revolving credit line with variable rates and separate draw and repayment phases. In our $75,000 cash-needed comparison:
Users evaluating revolving lines should also explore the HELOC Calculator to review two-phase payment shock and rate stress scenarios.
A cash-out refinance replaces your existing first mortgage with a new, larger loan, whereas a home equity loan adds a second lien while keeping your original first mortgage untouched.
When an existing first mortgage carries a low rate (e.g. 3.5%), preserving that low rate on the $275,000 balance is often far more cost-effective than refinancing the entire $350,000+ debt at today's higher interest rates. For a dedicated first-mortgage replacement analysis, use the Refinance Calculator.
Making extra principal payments reduces the outstanding second mortgage balance faster and eliminates future interest charges. In our validated example ($125,000 loan @ 8.0%, 15-year term):
Borrowers comparing prepayment strategies across multiple liabilities can also utilize the Debt Payoff Calculator and Amortization Calculator.
Under the Tax Cuts and Jobs Act (TCJA), interest paid on a second mortgage is tax-deductible only if the proceeds are used to buy, build, or substantially improve the home securing the loan:
For our validated baseline with $6,000 in average annual deductible interest at a 24% federal tax bracket, projected tax savings equal $1,440/year, lowering the effective after-tax interest rate to 6.08%. If used for personal expenses or debt consolidation, the interest is non-deductible ($0 savings).
*Notice: Tax deductibility depends on individual tax filing status, aggregate mortgage debt limits ($750k MFJ), itemization, and documentation. This is an illustrative planning estimate, not formal tax advice.
The renovation module estimates post-project home value and net equity based on project cost and expected value ROI:
Expected ROI is a modeling assumption; actual appraised resale values depend on local market conditions. For overall home purchase budgeting, explore the House Affordability Calculator.
Because a home equity loan is secured by your home, failure to meet payment obligations can result in second-lien foreclosure. Borrowers should consider closing costs (2%–5%), potential overleveraging if property values decline, and the added cash-flow obligation alongside their primary mortgage.
If combined mortgage balances exceed the home's market value, the property enters negative equity (underwater state). While regular monthly payments remain unchanged, selling or refinancing requires bringing cash to closing to satisfy all outstanding lien balances. The calculator safely clamps borrowing capacity to $0 in negative equity scenarios.
Many modern second mortgage products allow early payoff without penalty, but prepayment terms remain loan-specific. Borrowers should always verify early payoff terms directly within their loan agreement.
Second mortgage closing costs typically range from 2% to 5% of the loan amount ($1,500–$4,000), covering appraisal fees, title searches, credit reports, and origination charges. Loan approval and funding usually require 2 to 6 weeks, depending on documentation, appraisal turnaround, and lender processing capacity.
Home equity loans and second mortgages are governed by the Truth in Lending Act (TILA), Real Estate Settlement Procedures Act (RESPA), and IRS Publication 936. This calculator generates mathematical simulations based on user inputs and does not constitute a commitment to lend, financial advice, or formal tax counsel.