Home Equity Loan Payment Calculator

Reviewed by: David Chen, CFA
Mr. Chen is a Chartered Financial Analyst specializing in fixed-income securities and mortgage-backed products, ensuring the amortization calculations are rigorously accurate.

The **Home Equity Loan Payment Calculator** helps you quickly determine the **Loan Principal ($P$)**, **Monthly Payment ($M$)**, **Annual Rate ($R$)**, or **Loan Term ($T$)** based on the other three variables. This is crucial for planning debt consolidation or home renovation financing.

Home Equity Loan Payment Calculator

*Enter any 3 values to solve for the 4th. Term is in years.

Loan Amortization Formulas & Logic

The calculation is based on the standard monthly amortization formula:

1. Monthly Payment ($M$):

$$ M = P \frac{i(1+i)^n}{(1+i)^n - 1} $$

Where $i$ is the monthly rate ($R/1200$) and $n$ is the total months ($T \times 12$).

2. Loan Principal ($P$):

$$ P = M \frac{(1+i)^n - 1}{i(1+i)^n} $$

Formula Source: Investopedia (Amortization)

Variables Explained

  • $P$ (Loan Principal): The initial lump sum borrowed. (F in input map)
  • $M$ (Monthly Payment): The fixed monthly amount paid toward Principal and Interest. (P in input map)
  • $R$ (Annual Interest Rate): The annual rate applied to the loan. (V in input map)
  • $T$ (Loan Term): The total duration of the loan in years. (Q in input map)

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What is a Home Equity Loan?

A **Home Equity Loan (HEL)** is a type of second mortgage that allows a homeowner to borrow against the equity they have built up in their primary residence. Unlike a Home Equity Line of Credit (HELOC), a HEL provides a **fixed lump sum** of money upfront, which is repaid over a fixed period with a fixed interest rate. This makes the monthly payments predictable, offering stability for budgeting.

The loan is secured by the home, meaning that if the borrower defaults, the lender can foreclose. Because it is secured debt, the interest rates offered on HELs are typically much lower than those of unsecured personal loans or credit cards. Borrowers often use home equity loans to fund large, one-time expenditures, such as significant home renovations, debt consolidation, or major medical expenses.

Understanding the repayment schedule is crucial. Since both the principal and interest are fixed over the life of the loan, the total term (T) and the monthly payment (M) are the primary factors determining affordability. This calculator helps determine these variables, enabling informed financial decisions.

How to Calculate Home Equity Loan Payment (Example)

Scenario: Loan Principal ($P$) of \$40,000, 8% Annual Rate ($R$), over 10 years ($T$).

  1. Determine Monthly Rate and Total Periods:

    Monthly rate ($i$) = $0.08 / 12 = 0.006667$. Total periods ($n$) = $10 \times 12 = 120$ months.

  2. Calculate the Monthly Payment ($M$):

    $$ M = \$40,000 \frac{0.006667(1.006667)^{120}}{(1.006667)^{120} – 1} $$

    Payment Factor $\approx 0.012133$.

  3. Find the Monthly Payment:

    $$ M = \$40,000 \times 0.012133 \approx \$485.32 $$

  4. Conclusion:

    The required Monthly Payment ($M$) is approximately \$485.32.

Frequently Asked Questions (FAQ)

Q: Is the interest on a Home Equity Loan tax deductible?

Interest on home equity debt may be tax deductible if the funds are used to buy, build, or substantially improve the home that secures the loan. Consult a tax professional for current regulations.

Q: Does a Home Equity Loan affect my primary mortgage?

No, a Home Equity Loan is a separate, second mortgage. It does not change the terms of your primary mortgage, but it does add another monthly debt obligation and increases your total debt secured by the home.

Q: What happens if I want to pay off the Home Equity Loan early?

Like a mortgage, paying off a Home Equity Loan early reduces the total interest paid. Be sure to check with your lender for any prepayment penalties before accelerating your payments.

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