Mortgage Affordability Formula:
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The mortgage affordability calculation determines how much home you can afford based on your desired monthly payment and current interest rates. It helps potential homebuyers understand their purchasing power before house hunting.
The calculator uses the mortgage affordability formula:
Where:
Explanation: The formula calculates the maximum principal amount that can be borrowed given a fixed monthly payment and interest rate over a 30-year period.
Details: Understanding your mortgage affordability helps set realistic expectations when shopping for homes, prevents overextension of finances, and ensures you stay within a comfortable budget.
Tips: Enter your desired monthly payment in USD and current interest rate in decimal form (e.g., 0.04 for 4%). The calculator assumes a standard 30-year mortgage term.
Q1: Why use a 30-year term in the calculation?
A: 30-year mortgages are the most common, but you can adjust the months in the formula if considering different terms.
Q2: Does this include taxes and insurance?
A: No, this calculates principal and interest only. For complete affordability, consider adding ~1.25% of home value annually for taxes and insurance.
Q3: What's a good rule of thumb for monthly payment?
A: Most financial advisors recommend keeping housing costs below 28% of gross monthly income.
Q4: How does credit score affect affordability?
A: Higher credit scores typically qualify for lower interest rates, increasing your purchasing power for the same monthly payment.
Q5: Should I consider other debts when using this?
A: Yes, total debt payments (including mortgage) should ideally stay below 36% of gross income for financial health.