Why the Down Payment Matters
A larger down payment means a smaller loan, a lower monthly payment, and less interest paid over the life of the loan — but it also ties up more of your savings upfront. Conventional loans often allow as little as 3-5% down, FHA loans allow 3.5% down, and VA/USDA loans can allow 0% down for eligible borrowers — but anything below 20% down on a conventional loan typically triggers private mortgage insurance (PMI). This single number ends up shaping almost every other part of your home-buying decision, from your monthly payment to how much of your savings you have left over for moving costs, furnishing, and your emergency fund.
How This Calculator Works
Down Payment = Home Price × Down Payment %
Loan Amount = Home Price − Down Payment
The monthly principal & interest payment on that loan amount is then calculated using the standard amortization formula — Payment = [P × r × (1 + r)ⁿ] ÷ [(1 + r)ⁿ − 1], where P is your loan amount, r is your monthly interest rate, and n is the number of months in your loan term — so you can see exactly how your down payment choice changes your monthly outgo. If your down payment is below 20%, this calculator also estimates PMI at roughly 0.5%-1% of the loan amount annually, added on top of principal & interest.
For example, imagine a $400,000 home with a 6.5% interest rate and a 30-year term. Put down 10% ($40,000), and you're financing $360,000, with a principal & interest payment of roughly $2,275/month plus an estimated $180-300/month in PMI. Put down 20% ($80,000) instead, and you're financing $320,000, with a payment closer to $2,022/month — and no PMI at all. That's a meaningful monthly difference driven entirely by how much you put down upfront.
Private Mortgage Insurance (PMI)
In the U.S., putting down less than 20% on a conventional loan usually means paying PMI — insurance that protects the lender, not you, in case you default. PMI typically costs 0.5%-1% of the loan amount per year, split into monthly payments and added on top of your principal & interest. The good news: PMI isn't permanent. Once your loan balance drops to 80% of the home's original value (through payments, appreciation, or both), you can request PMI removal, and lenders are required to automatically cancel it once your balance hits 78%. FHA loans work differently — mortgage insurance premiums (MIP) on FHA loans with less than 10% down typically last for the life of the loan, which is one reason many buyers who qualify for a conventional loan prefer it over FHA once they have the credit score to do so.
Should You Put Down More Than the Minimum?
A typical mistake we often see is buyers assuming a bigger down payment is always the smarter move, simply because it lowers the monthly payment and avoids PMI. That's often true financially, but it isn't the whole picture. Let's say you have $80,000 in savings and are buying a $400,000 home with a minimum required down payment of $12,000 (3%). Putting the full $80,000 down leaves you with almost no cushion for moving costs, furnishing, closing costs, or unexpected expenses right after a major purchase — a genuinely risky position for most households, even though it produces the lowest possible monthly payment.
A more balanced approach many financial planners suggest: put down what meaningfully reduces your monthly payment and clears the 20% PMI threshold if reasonably achievable, while keeping at least a few months of expenses in reserve as an emergency fund after the purchase. The lowest possible payment isn't useful if it comes at the cost of financial fragility in the following months.
Costs the Down Payment Doesn't Cover
One common scenario that catches first-time buyers off guard: budgeting exactly the down payment amount and assuming that's the total upfront cash needed. In reality, closing costs — lender origination fees, title insurance, appraisal, escrow setup, and recording fees — are separate costs layered on top of the down payment. These typically add another 2-5% of the purchase price, which needs to be budgeted for separately rather than assumed to be included in the down payment figure.
Down Payment Sources: What Lenders Typically Accept
Lenders generally want to see that your down payment comes from genuine, traceable savings or investments — checking and savings account balances, investment account withdrawals, and retirement account loans or withdrawals (401(k)/IRA) are all commonly accepted, usually with two to three months of bank statements to document the source. Many freelancers and self-employed buyers experience extra scrutiny here, since lenders often want a clearer paper trail connecting the funds to legitimate income sources, given the less predictable income pattern compared to W-2 employees. Gifted funds from family are usually accepted too, though lenders require a signed gift letter confirming the money doesn't need to be repaid, since undisclosed borrowed funds used as a down payment can affect your actual debt burden in ways the lender needs to account for.
How Down Payment Size Affects Loan Approval Odds
Beyond just lowering your monthly payment and avoiding PMI, a larger down payment can also improve your chances of loan approval and may help you negotiate a marginally better interest rate, since it reduces the lender's risk exposure on the loan. A self-employed borrower with variable income, for example, might find that offering a larger down payment than the minimum required helps offset a lender's hesitation around income variability, since it demonstrates both financial discipline and reduces the amount the lender is exposed to if repayment becomes difficult.