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Key Mortgage Components

• Principal: The loan amount borrowed (home price minus down payment).
• Interest Rate: Annual percentage charged by lender (currently 6-8% in 2024 for 30-year fixed).
• Term (Loan Duration): Repayment period, typically 15 or 30 years in the US.
• Down Payment: Upfront cash payment toward purchase (typically 3-20% of home price).
• Monthly Payment: Fixed amount paid monthly covering principal, interest, taxes, insurance (PITI).
• PMI (Private Mortgage Insurance): Required if down payment < 20%, adds 0.5-1% annually until 20% equity reached.

Example: $400,000 Mortgage at 7% for 30 Years

Monthly Payment: $2,661

• First Payment: $333 principal + $2,333 interest
• Year 10: ~$600 principal + $2,000 interest (gradual shift)
• Year 20: ~$1,200 principal + $1,400 interest (approaching balance point)
• Final Payment: $2,646 principal + $15 interest (almost all principal)
• Total Interest Paid: $558,000 over 30 years (140% of loan amount!)

Key Insight: You pay the loan amount TWICE—once in principal, once in interest—over 30 years. This is why extra payments save massive amounts.

Fixed-Rate Mortgages

Interest rate remains constant for entire loan term. Most popular mortgage type in US.

• 30-Year Fixed: Lower monthly payments, higher total interest, most common choice.
• 15-Year Fixed: Higher monthly payments, significantly lower total interest, build equity faster.
• Pros: Predictable payments, protection from rising rates.
• Cons: Higher initial rates than ARMs, less flexibility.

Adjustable-Rate Mortgages (ARM)

Interest rate changes periodically based on market indexes. Example: 5/1 ARM = fixed for 5 years, then adjusts annually.

• Pros: Lower initial rates (typically 0.5-1% below fixed), good for short-term ownership.
• Cons: Payment uncertainty, potential for significant increases, complexity.
• Best For: Buyers planning to sell/refinance within fixed period, expecting income growth.

Government-Backed Loans

• FHA Loans: 3.5% down payment minimum, easier credit qualification, mortgage insurance required.
• VA Loans: 0% down for veterans/active military, no PMI, competitive rates, funding fee required.
• USDA Loans: 0% down for rural properties, income limits apply, no PMI.

Down Payment Percentages & Impact

• 3-5% Down: Minimum for conventional loans, requires PMI, higher monthly payments, easier to qualify upfront.
• 10% Down: Moderate equity, still requires PMI, balances cash preservation with lower interest.
• 20% Down (Traditional Standard): Avoids PMI (~$100-300/month savings), better rates, greater equity protection.
• 25-50% Down: Significantly lower payments, minimal interest paid, but ties up substantial capital.

PMI Cost: On $400k home with 5% down: ~$150-250/month until 20% equity reached (5-7 years). Total PMI cost: $10,000-20,000.

The 20% Down Payment Myth

Traditional wisdom says "save 20% before buying." Modern reality: Many successful homeowners start with 3-10% down, especially in appreciating markets where waiting to save 20% means prices increase faster than savings accumulate.

Break-Even Analysis: If homes appreciate 5% annually and you save $1,500/month toward a $400k home (needing $80k), prices rise to $420k after year 1, $441k after year 2. You're running to stand still. Lower down payment gets you in sooner, building equity via appreciation + payments.

• 28% Front-End Ratio: Monthly housing costs (PITI) should not exceed 28% of gross monthly income.
• 36% Back-End Ratio: Total monthly debt payments (housing + car + student loans + credit cards) should not exceed 36% of gross income.

Example: $100,000 annual income ($8,333/month):
Maximum housing: $2,333/month (28%)
Maximum total debt: $3,000/month (36%)

• Estimate Affordability: Work backward from desired monthly payment to determine affordable home price.
• Compare Scenarios: Calculate 15-year vs. 30-year, or 5% vs. 20% down to compare total costs.
• Rate Shopping: See how 0.5% rate difference impacts monthly payment and total interest.
• Refinancing Decisions: Calculate potential savings from refinancing to lower rate.
• Extra Payment Impact: Model how additional principal payments reduce loan term and interest costs.