Loan for a Down Payment on a House?

This calculator estimates the monthly principal-and-interest payment and total interest on a fixed-rate loan that could be used toward a house down payment. Enter the loan amount, annual percentage rate (APR), and term to see the estimated costs; it does not determine whether a lender will permit borrowed down-payment funds.

Formula

The calculator uses the standard fixed-payment loan formula. It converts the annual APR to a monthly rate, then calculates a level monthly payment over the term:

• Monthly payment = P × r ÷ [1 − (1 + r)⁻ⁿ]
• Total interest = monthly payment × n − P

P is the amount borrowed in dollars; r is the monthly interest rate, calculated as APR ÷ 1,200 when APR is entered as a percentage; and n is the number of monthly payments, calculated as years × 12. The displayed formula does not include fees or other homeownership costs. Its payment is not necessarily the payment on a mortgage: it represents only the separate loan entered here.

Worked Example

Using the calculator’s default values—$20,000 borrowed, 8% APR, and a five-year term:

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

These results describe a hypothetical loan at the inputs shown, not an offer or a prediction of the terms available to a particular borrower.

Assumptions

• The interest rate is fixed for the entire term.
• Payments are equal monthly payments, made at the end of each monthly period.
• Interest accrues monthly using APR divided by 12.
• Fees, taxes, insurance, mortgage insurance, escrow, and any mortgage payment are not included.

Can You Use a Loan for a House Down Payment?

Possibly, but permission depends on the mortgage lender, the mortgage product, and the source and terms of the borrowed money. A down payment is the portion of a home’s purchase price paid upfront rather than financed by the mortgage. If that money comes from another loan, the mortgage lender may treat the new monthly payment as a debt obligation when reviewing the application. That can affect the lender’s assessment of the borrower’s finances, and some mortgage requirements may restrict which funds can be used.

Do not assume that funds are acceptable simply because they are in a bank account or because the separate loan has already been approved. Before borrowing, ask the mortgage lender how it treats the specific source of funds and what documentation it requires. Disclose the debt and its payment accurately. Hiding a loan or describing borrowed funds as savings or a gift can create serious problems during the mortgage process.

How Borrowed Down-Payment Money Affects the Costs

Borrowing for the upfront contribution does not make the cost disappear; it adds a separate debt alongside the mortgage. For example, this calculator’s hypothetical $20,000 loan at 8% APR over five years produces a payment of about $405.53 a month and $4,331.80 in total interest, based on the rounded payment. A household would need to account for that payment in addition to the mortgage, property-related costs, and any other debts. The example is arithmetic only, not a claim about available rates or lending terms.

The amount financed on the mortgage may be lower when a larger down payment is accepted, but the combined cost cannot be assessed from this calculator alone. Mortgage interest, mortgage insurance, closing costs, property taxes, insurance, maintenance, and the separate loan’s fees may all matter. The terms of the mortgage and the separate loan also may differ, so compare their full written costs rather than looking only at one monthly payment.

Questions to Ask Before Borrowing

• Will the mortgage lender accept this source of down-payment funds? Ask about the exact type of loan and whether the lender needs statements, loan documents, or other records.
• What is the full cost of the separate loan? Check APR, payment, term, origination or other charges, and whether the rate or payment can change.
• How does the additional payment affect the monthly budget? Consider it alongside the proposed mortgage payment, existing debt payments, utilities, repairs, and other recurring costs. This calculator cannot determine affordability or approval.
• Could the debt change before the mortgage closes? Ask the mortgage lender how it wants changes in borrowing or finances reported during the application process.

Alternatives and Common Misconceptions

Borrowing is not the only possible way to address a down-payment gap. Depending on the mortgage lender’s requirements and the borrower’s circumstances, alternatives to ask about may include saving for longer, changing the purchase budget, or using funds from an eligible source that the lender accepts. A gift or assistance arrangement should not be represented as a gift if repayment is expected; ask the lender what documentation and conditions apply.

A common misconception is that a personal loan automatically counts as a down payment because it is unsecured. The collateral arrangement does not, by itself, establish whether the mortgage lender accepts the funds or how it will count the debt. Another misconception is that the down payment is the only cash needed at closing. Other transaction costs may apply, and the exact amount depends on the transaction and lender disclosures.

Use this calculator to understand the separate loan’s estimated payment and interest, then obtain the actual terms and applicable mortgage requirements directly from the relevant lender. The result is an estimate; the lender’s disclosure gives the exact figures.

Frequently Asked Questions

Can I take out a personal loan for a house down payment?
It depends on the mortgage lender’s requirements and the loan’s terms. Ask the lender before borrowing, and disclose the debt and source of funds.

Does a loan for a down payment affect mortgage approval?
It may be considered as an additional debt payment in the lender’s financial review. This calculator cannot predict approval or determine how a particular lender will assess it.

Can I use a credit card cash advance for a down payment?
Do not assume it is acceptable. Ask the mortgage lender about the specific source and disclose any resulting balance and payment obligation.

Is a gift the same as a loan for a down payment?
No. A gift is not expected to be repaid, while a loan creates an obligation to repay. Ask the lender what documentation applies and do not label repayable money a gift.

What costs does this calculator leave out?
It estimates only the payment and interest for the separate fixed-rate loan. It excludes loan fees, mortgage costs, taxes, insurance, mortgage insurance, and escrow.

Related

• High APR Personal Loan Payment Calculator
• High APR Personal Loan Payment Calculator
• High-APR Personal Loan Payment Calculator

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 | $ | p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2