Down Payment & Mortgage Housing Calculator

Calculate your required down payment cash, financed mortgage principal, monthly PITI payments, and Private Mortgage Insurance (PMI) requirements.

Property & Financing Parameters

Purchase Scenarios
$
%
%
yrs
$/yr
Estimated Total Monthly Housing
$2,935/ month
Zero PMI (20%+ Down)

Down Payment

$90,000

Loan Principal

$360,000

Monthly P&I

$2,335

Taxes & Ins

$600/mo

Monthly Housing Composition
Mortgage Principal & Interest:$2,335 / mo
Property Taxes & Hazard Insurance:$600 / mo
Total Monthly Outlay:$2,935 / mo

Private Home Purchase Plan

Your home prices, down payment savings, and monthly budget parameters are computed 100% locally in your browser.

Home Down Payment Mathematics & PITI Housing Formulas

Home purchase financing balances upfront liquidity with monthly mortgage amortization and PMI obligations:

1. Upfront Down Payment & Loan Principal
Down Payment = Purchase Price ×
Down %100
; Loan Principal = Purchase Price - Down Payment
2. All-Inclusive Monthly Housing Cost (PITI + PMI)
Total Monthly Check = Monthly P&I + (Annual Taxes & Insurance / 12) + Monthly PMI
Step-by-Step Down Payment Breakdown
Step 1: Calculate Required Upfront Cash Down Payment
$450000 price × 20% = $90,000 upfront cash (Leaves $360,000 mortgage debt).
Step 2: Monthly Principal & Interest (P&I)
Amortized over 30 years @ 6.75% = $2,335 / month.
Step 3: Total All-In Monthly Housing Commitment
Total Monthly Housing=$2,935 / mo (Zero PMI Required)

Down Payment Tiers & Loan Program Guidelines

Mortgage ProgramMinimum Down PaymentMortgage Insurance RulesBest Suited For
Conventional Conforming3% to 5%PMI required if down < 20% (cancels at 80% LTV)Borrowers with 680+ credit scores
FHA Loan (Federal Housing)3.5%Upfront MIP (1.75%) + Annual MIP for life of loanFirst-time buyers with 580+ credit
VA Loan (Veterans Affairs)0% DownNo monthly PMI (One-time VA Funding Fee applies)Eligible military service members & veterans
20%+ Equity Conventional20.0%Zero PMI from Day 1Buyers seeking lowest monthly outlay

Frequently Asked Questions

How much down payment do I really need to buy a home?
While a 20% down payment eliminates Private Mortgage Insurance (PMI), many mortgage programs require significantly less: Conventional conforming loans allow as little as 3% down, FHA loans require 3.5%, and VA / USDA loans offer 0% down payment financing for eligible borrowers.
What is Private Mortgage Insurance (PMI) and when does it cancel?
PMI is an insurance policy that protects the mortgage lender if you default on payments. It is typically required on conventional loans when putting down less than 20%. Under the Homeowners Protection Act, you can request PMI cancellation once your loan balance reaches 80% of the original purchase value.
How does putting down 20% vs 5% affect monthly mortgage payments?
On a $450,000 home at 6.75% interest, putting down 20% ($90,000) results in a ~$2,335/mo P&I payment with zero PMI. Putting down 5% ($22,500) results in a ~$2,773/mo P&I payment plus ~$250/mo in PMI, increasing your total monthly payment by nearly $688/month.
What other upfront costs should I budget for besides the down payment?
In addition to your down payment, buyers must budget 2% to 5% of the loan amount for closing costs (lender origination points, title insurance, home inspection, appraisal, recording fees, and initial escrow reserves for property taxes and homeowners insurance).

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