For informational purposes only. Not financial, investment, or tax advice. Results are estimates based on the inputs provided. Consult a qualified financial professional before making financial decisions.
Calculator tool
How this calculator works
Use the explanation to understand the formula, assumptions, and practical limits behind the calculator result.
What the Down Payment Changes
The down payment is the part of the purchase price you pay upfront. A larger down payment reduces the loan amount and lowers the loan-to-value ratio:
Why the 20% Mark Matters
For many conventional mortgages, putting less than 20% down can mean private mortgage insurance is required. This calculator uses a simple 1% annual PMI planning estimate when the down payment is below 20%; actual PMI depends on the loan, insurer, credit profile, and lender quote.
| Down payment | LTV | Typical planning implication |
|---|---|---|
| 5% | 95% | Smaller upfront cash, higher financed amount |
| 10% | 90% | Lower loan than 5%, PMI may still apply |
| 20% | 80% | Common conventional threshold where PMI may be avoided |
Cash Needed Is More Than Down Payment
The calculator isolates the down payment decision. Buyers also need to plan for closing costs, prepaid taxes or insurance, inspection, moving, repairs, and emergency reserves after closing.
Use Percent and Cash Together
Test both the percentage and the dollar result. A percentage can sound manageable while the actual cash requirement is still too high for the current timeline.
Frequently asked questions
Do I always need 20% down?
No. Many loan programs allow less, but a smaller down payment usually means a larger loan balance and may add mortgage insurance or other costs. The right target depends on the loan program and how much cash you need to keep after closing.
Is the PMI number exact?
No. The calculator uses a rough 1% annual estimate only for planning. Real PMI pricing varies with loan type, LTV, credit profile, insurer, and lender quote.
Why keep cash after making the down payment?
Because closing costs and early homeownership costs arrive quickly. Spending every available dollar on the down payment can leave too little for repairs, moving, taxes, insurance, or emergencies.
Should I compare 10% and 20% scenarios?
Yes. Compare the loan amount, monthly payment, PMI exposure, and how long it takes to reach each cash target. The better choice is not always the largest down payment if it empties reserves.
