Down Payment Calculator & Homebuyer Reserve Planner
Calculate your down payment and loan amount, the total cash you need to close, mortgage insurance trade-offs from 3% to 20% down, and how much to save each month to get there.
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Down Payment Tier & Mortgage Insurance Matrix
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| Down Payment Tier | Equity Capital | Est. Monthly PMI / MIP | 5-Year Insurance Cost | Total Cash to Close | LTV & Insurance Status |
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Conventional PMI modeled at 0.60%/0.50%/0.35%/0.25% of the loan a year by LTV band and dropped at 78% LTV on schedule; actual rates depend on your credit score and insurer. FHA shown with the 0.55% annual MIP that applies to most 30-year loans (life of loan below 10% down), excluding the 1.75% upfront premium.
24-Month Milestone Progression Ledger
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| Milestone Horizon | Monthly Deposit | Cumulative Interest | Total Accumulated Balance | Target Completion | Readiness Milestone |
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The True Cost of PMI: Is Waiting for 20% Worth It?
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Home price growth is an assumption — prices can also fall. Compare with your local market.
Lender Reserve Requirements & Sourcing Rules
Lenders check that your down payment funds are yours, documented and still available after closing:
- Cash reserves: depending on the loan and your profile, lenders may require about 2–6 months of mortgage payments (PITI) left in the bank after closing.
- Seasoned funds: lenders typically review two months of bank statements; large, unexplained deposits need a paper trail.
- Gift letters: money from family usually needs a signed letter confirming it's a gift, not a loan, plus proof of the transfer.
Why 20% is a common target
Putting down 20% typically avoids private mortgage insurance (PMI) on a conventional loan, which can save a meaningful amount over the life of the loan — though many programs allow lower down payments.
By Suhaib Hassan · Formula verified 27 Sep 2026 · How CalculatePilot verifies formulas →
How down payment size affects your options
Beyond the loan amount itself, down payment size affects which loan programs you qualify for and whether you'll pay for mortgage insurance. Conventional loans typically require PMI below 20% down, while some government-backed programs (FHA, VA) have different down payment and insurance structures entirely.
A larger down payment also strengthens your offer in competitive housing markets, since sellers often view buyers with more cash down as lower-risk, better-financed purchasers.
A worked example
On a $425,000 home at 15% down: the down payment is $63,750, leaving a loan amount of $361,250.
Compare that to 20% down on the same home: $85,000 down, $340,000 loan — a $21,250 larger upfront payment, but a loan $21,250 smaller, which likely also avoids PMI, potentially saving more over time than the extra upfront cash.
Down payment assistance options
Beyond saving independently, many buyers use down payment assistance programs, gift funds from family, or low-down-payment loan programs (some allow as little as 3-5% down) to reach homeownership sooner rather than waiting to save a full 20%.
The trade-off for a smaller down payment is usually private mortgage insurance (PMI) and a larger loan balance, both of which increase the monthly payment — worth weighing against the value of buying sooner rather than continuing to save while home prices and rates may change. Once you've settled on a down payment amount, run the numbers through the Mortgage Calculator to see your full monthly payment.
Read the guide: How much down payment do you need for a $400,000 house?
Frequently asked questions
Can I buy a home with less than 20% down?
Yes — many conventional and government-backed loan programs allow down payments as low as 3-5%, though you'll typically pay for mortgage insurance until you build enough equity.
Do I need 20% down to buy a home?
No — many loan programs allow down payments as low as 3-5%, though anything below 20% on a conventional loan typically requires paying for private mortgage insurance (PMI).
Where should down payment savings be kept?
Since it's typically needed within a few years, many people keep down payment savings in lower-risk accounts like high-yield savings rather than volatile investments, to avoid the risk of a market downturn right before buying.
Are there loan programs that allow less than 20% down?
Yes — many conventional and government-backed programs (FHA, VA, USDA where applicable) allow down payments well below 20%, sometimes as low as 3%, typically with mortgage insurance required until sufficient equity is reached.
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