Down Payment Calculator

How Much Down Payment Do You Actually Need?

20% down is the number most people have heard of, but it's a threshold, not a requirement. Conventional loans often accept as little as 3-5% down, FHA loans allow 3.5%, and VA or USDA loans can allow 0% down for qualifying borrowers. The real question isn't "can I buy with less," it's "what does putting down less actually cost me" — mainly through private mortgage insurance and a larger loan balance.

PMI Explained

Private Mortgage Insurance (PMI) protects the lender, not you, if you default on a conventional loan with less than 20% down. It's typically added to your monthly payment and estimated as a percentage of your loan balance per year — this calculator uses a rough 0.75% annual estimate, though actual rates vary by lender, credit score, and down payment size. PMI usually cancels automatically once you reach 20% equity in the home.

How Your Down Payment Affects Your Loan

Every dollar you put down is a dollar you don't have to borrow — a larger down payment directly shrinks your loan amount, which lowers both your monthly payment and the total interest you'll pay over the life of the loan. It also gives you an equity cushion from day one, which matters if home values dip shortly after you buy.

The Down Payment and PMI Formulas

$$\text{Down Payment} = \text{Home Price} \times \text{Down \%}$$

Loan amount is simply the home price minus that down payment. When the down payment is below 20%, monthly PMI is estimated as:

$$\text{Monthly PMI} = \frac{\text{Loan Amount} \times 0.75\%}{12}$$

For how long it takes to reach your goal, the calculator projects your current savings forward, adding your monthly contribution and compounding your chosen return rate each month — the same period-by-period approach used by the savings-growth chart above, so the projected date always matches what the chart shows.

Worked Example: 350,000-Dollar Home, 10,000 Dollars Saved So Far

Using the calculator's own default numbers — a 350,000-dollar home at 20% down, 10,000 dollars already saved, 500 dollars saved monthly, and a 2% annual return — the down payment needed is 70,000 dollars, and since 20% clears the PMI threshold exactly, no PMI applies. Starting 60,000 dollars short of the goal, saving 500 dollars a month at 2% growth reaches the full 70,000 dollars in 107 months — about 8 years and 11 months.

Tips to Save Faster for a Down Payment

Automating a fixed transfer to a dedicated high-yield savings account right after each paycheck tends to work better than saving "whatever's left over." Keeping the money in an account that earns interest — even a modest 2-4% — meaningfully speeds up the timeline compared to a non-interest checking account, especially over a multi-year savings goal.

Down Payment Assistance Programs

Many state and local housing agencies, along with some employers and nonprofits, offer down payment assistance for eligible first-time or lower-income buyers — often structured as a grant, a low-interest second loan, or a forgivable loan tied to staying in the home for a set number of years. Eligibility and available amounts vary enormously by location and program, so it's worth checking your state housing finance agency's website before ruling this option out, even if you think you don't qualify.

Common Down Payment Mistakes

Draining an emergency fund entirely to maximize the down payment is a common misstep — most lenders and financial advisors recommend keeping some cash reserve after closing to cover unexpected repairs or a gap in income. Another mistake is ignoring closing costs, which are separate from the down payment and typically run 2-5% of the loan amount, catching some buyers off guard when it's time to close. Finally, some buyers wait too long chasing a full 20% down while home prices and rates rise around them, when a smaller down payment with PMI (which cancels once you reach 20% equity) might have gotten them into a home for less total cost.

Down Payment Terms You Should Know

Loan-to-Value Ratio (LTV) — the loan amount divided by the home's value; an 80% LTV means you put 20% down.

Equity — the portion of the home's value you actually own, starting with your down payment and growing as you pay down principal and the home appreciates.

Earnest Money — a deposit made when your offer is accepted, separate from the down payment, that signals good faith and is typically applied toward the down payment or closing costs at closing.

Seller Concessions — an amount the seller agrees to contribute toward the buyer's closing costs, negotiated as part of the purchase offer.

This calculator provides estimates for educational and planning purposes only. PMI rates, loan program minimums, and closing costs vary by lender. Consult a mortgage professional for guidance specific to your situation.