Home Equity Loan for a Down Payment? How It Works

A home equity loan can provide cash for a down payment on another home, but it turns equity in your current home into debt secured by that home. This calculator estimates the new loan’s monthly payment and total interest from the amount borrowed, APR, and term; it does not determine how much equity a lender will let you borrow or whether you qualify.

Formula

The calculator uses the standard fixed-rate, level-payment loan formula. It first converts the annual percentage rate (APR) to a monthly rate, then calculates the payment that pays off the principal over the selected number of monthly payments.

• p = amount borrowed, in dollars.
• apr = annual percentage rate, entered as a percentage.
• r = monthly rate, calculated as apr ÷ 1,200.
• n = number of monthly payments, calculated as years × 12.
• pmt = monthly payment, rounded to the nearest cent.
• int = estimated total interest over the full term, based on the rounded monthly payment.

In symbols, payment = round[p × r ÷ (1 − (1 + r)⁻ⁿ), 2]. Total interest = payment × n − p. These calculations assume that the loan is repaid through equal monthly payments and that the entered APR applies throughout the term.

Worked Example

Using the calculator’s default values: p = $20,000, APR = 8%, and term = 5 years.

1. Convert the APR to a monthly rate: r = 8 ÷ 1,200 = 0.0066667.
2. Convert the term to payments: n = 5 × 12 = 60.
3. Apply the payment formula: $20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰] = $405.53 per month, rounded to cents.
4. Calculate total interest using the rounded payment: $405.53 × 60 − $20,000 = $4,331.80.

The result is an estimate for this example’s loan terms, not a quote for a home equity loan.

Assumptions

• The interest rate is fixed for the entire term.
• Payments are equal, made monthly, and begin on the regular schedule for an amortizing loan.
• Interest compounds monthly at APR ÷ 12.
• The estimate excludes lender fees, taxes, insurance, mortgage insurance, escrow, and any costs associated with buying or selling a home.

How a Home Equity Loan Could Fund a Down Payment

A home equity loan is generally a lump-sum loan secured by the home you already own. The amount available, if any, depends on factors determined by the lender, such as the home’s value, existing mortgage balance, and application details. The new loan is separate from your current mortgage, so you may have two payments tied to the existing home.

If the loan proceeds are used toward a down payment on another property, the new property’s mortgage would be an additional obligation. For example, borrowing $30,000 against the current home does not make that money cost-free: the borrower must repay the home equity loan while also meeting the payments and costs associated with the new home. The calculator models only the home equity loan payment and interest.

A home equity loan differs from a home equity line of credit (HELOC). A loan generally delivers a lump sum with a scheduled repayment structure; a HELOC is a revolving credit line that can allow borrowing at different times under its terms. The payment pattern and rate structure can differ, so this calculator is not a HELOC payment estimator.

Costs, Risks, and Qualification Questions

Using equity for a down payment can increase total debt and put the current home at risk if the secured loan is not repaid. It can also affect the overall picture considered in a mortgage application: the new home’s lender may account for the added monthly obligation when assessing the application. Approval, permitted use of funds, and documentation requirements depend on the lenders and transaction; the calculator cannot establish them.

Ask the relevant lenders for the actual APR, payment schedule, fees, repayment terms, and any conditions on using borrowed funds. Consider the full cash requirement for the purchase, not just the down payment. Closing costs, moving costs, repairs, property taxes, insurance, and reserves may also matter, but none are included in the calculator.

One common misconception is that a home’s estimated equity is automatically available as cash. Equity is a difference between a home’s value and debts secured by it; it is not the same as approved borrowing capacity. A lender’s valuation and underwriting determine whether a loan is offered and on what terms. Another misconception is that a larger down payment always offsets the risk of borrowing it: the source of the funds and the added debt still matter to the overall transaction.

Alternatives and Comparing the Full Picture

Other ways to assemble a down payment may include savings, proceeds from selling a current home, or another source permitted by the mortgage lender. Each has different timing, documentation, and cost implications. Do not assume that borrowed funds from another source will be accepted; ask the mortgage lender how the source must be documented and whether it affects the application.

When comparing a home equity loan with alternatives, look beyond the headline payment. Compare total repayment, fees, payment timing, whether the rate can change, and which property secures the debt. For a possible sale of the current home, also account for the timing of the sale and the payoff of debts attached to that home. Use the calculator to explore loan arithmetic, then obtain transaction-specific figures from the relevant lenders.

Frequently Asked Questions

Can I use a home equity loan for a down payment?
It may be possible, but the home equity lender’s terms and the new mortgage lender’s requirements govern the transaction. Confirm that the funds and their source are acceptable before relying on them.

Does a home equity loan affect mortgage qualification?
It adds a monthly debt obligation, which may be considered in a mortgage application. Only the lender can explain how it will assess that debt in a specific application.

Is a home equity loan the same as a HELOC?
No. A home equity loan typically provides a lump sum repaid under a schedule, while a HELOC is a credit line with its own draw and repayment terms. This calculator estimates a fixed-payment loan, not a HELOC.

Can I borrow all the equity in my home?
Not necessarily. Equity is not automatically available to borrow, and the amount offered depends on the lender’s valuation, existing debts, and underwriting. Ask the lender for a determination.

What costs does this calculator leave out?
It excludes loan fees, taxes, insurance, mortgage insurance, escrow, purchase costs, and any other debts. It shows only estimated payment and interest for the entered loan amount, APR, and term.

This calculator is for educational estimates, not financial advice; the lender’s disclosure gives the exact figures.

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in p | Loan amount | $ | 20000 | 1 | 100000000
in apr | Interest rate (APR) | % | 8 | 0.01 | 100
in yrs | Loan term | years | 5 | 0.0833 | 50
out pmt | Monthly payment | $ | round(p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)), 2) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2