What is Mortgage Analysis?
Mortgage analysis is the process of evaluating a home loan by examining interest rates, loan terms, monthly payments, and total cost to determine if a loan is affordable and the best deal available. It's essential to avoid overpaying and finding loans that match your financial situation.
Mortgage analysis evaluates home loans by calculating monthly payments, total interest, amortization schedules, and affordability ratios. It helps you compare loans and decide if you can afford the home.
Step-by-step worked examples
You borrow $300K at 6% APR for 30 years. What's your monthly mortgage payment?
Use mortgage formula: M = P × [r(1+r)^n] / [(1+r)^n − 1] P = $300,000, r = 0.06/12 = 0.005, n = 30 × 12 = 360 M = 300,000 × [0.005(1.005)^360] / [(1.005)^360 − 1] M ≈ $1,799/month (principal + interest only)
Compare two loans for $200K: Loan A (6%, 30 years) vs. Loan B (5%, 15 years). Total interest paid?
Loan A: ~$231K total paid − $200K = $31K interest Loan B: ~$212K total paid − $200K = $12K interest Loan B costs $19K less in interest but has higher monthly payment (~$1,581 vs. ~$1,199) Choose based on cash flow capacity
A lender approves a mortgage if debt-to-income ratio ≤ 43%. You earn $60K/year. What's your max monthly housing payment?
Monthly income: $60K / 12 = $5,000 Max housing payment: $5,000 × 43% = $2,150 This includes mortgage principal, interest, taxes, insurance
Flashcards
Quick quiz
Q1.Mortgage analysis helps you…
Q2.In the first year of a 30-year mortgage, the monthly payment goes mostly to…
Q3.What is the debt-to-income (DTI) ratio?
Q4.Choosing a 15-year mortgage over 30-year means…
The full card deck, worked steps and AI-tutor support for “What is Mortgage Analysis?” are in Notek — study by hand before your exam.
Common mistakes
Only looking at monthly payment, ignoring total interest paid. — Correct: A 30-year mortgage at 6% costs 2× the home price; analyze total cost and amortization.
Assuming you can afford the maximum approved mortgage amount. — Correct: Lenders approve based on income, not affordability. Your emergency fund, retirement, and other goals matter.
Ignoring property taxes, insurance, and HOA fees in affordability calculations. — Correct: Monthly cost = principal + interest + taxes + insurance; total can be 30% higher than loan payment alone.
Not shopping multiple lenders or comparing rates and terms. — Correct: A 0.5% rate difference on $300K saves you $100+/month; get quotes from at least 3 lenders.
FAQ
What is mortgage analysis?
Process of evaluating a home loan by examining rates, terms, monthly payments, total interest, and affordability.
How is mortgage payment calculated?
Using the mortgage formula: M = P × [r(1+r)^n] / [(1+r)^n − 1], where P = loan, r = monthly rate, n = months.
What is an amortization schedule?
Table showing each month's payment split: principal (reduces balance) vs. interest (goes to lender).
What debt-to-income ratio do lenders require?
Most require debt-to-income (DTI) ≤ 43%; this includes all monthly debt (mortgage, car, credit cards) ÷ monthly income.