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Mortgage Affordability Calculator

Determine how much house you can afford based on your income, existing debts, and current mortgage rates.

(Car payments, student loans, minimum credit card payments, etc.)

Understanding Mortgage Affordability and DTI

Determining "how much house can I afford" is the crucial first step in the homebuying process. While it's tempting to look at maximum loan amounts, true affordability is based on balancing a new mortgage payment with your existing financial obligations and income. The primary metric lenders use to determine this is the Debt-to-Income (DTI) ratio.

What is the Debt-to-Income (DTI) Ratio?

Your DTI ratio is the percentage of your gross monthly income that goes towards paying debts. Lenders look at two types of DTI ratios:

  • Front-End Ratio: This is the percentage of your income that goes strictly toward housing costs (Principal, Interest, Taxes, and Insurance, or PITI). Lenders typically prefer this to be under 28%.
  • Back-End Ratio: This is the most critical number. It includes your potential housing costs plus all other recurring monthly debts, such as car payments, student loans, minimum credit card payments, and alimony. Most conventional lenders prefer a back-end ratio no higher than 36% to 43%, though some government-backed loans (like FHA) may allow higher ratios.

How This Calculator Works

This calculator uses a conservative approach focused on the back-end DTI ratio to estimate affordability. Here is the basic methodology used in the calculation above:

  1. Calculate Gross Monthly Income: Your annual salary divided by 12. For example, an $85,000 salary equals roughly $7,083 per month.
  2. Determine Maximum Total Debt Allowed: The calculator applies a 36% DTI rule. Using the example above: $7,083 x 0.36 = $2,550. This is the maximum amount lenders generally want to see going out for all debts combined.
  3. Calculate Available Mortgage Allowance: From that maximum total ($2,550), deduct your existing monthly debts. If you have $450 in car and student loan payments, you have $2,100 remaining ($2,550 – $450) for a mortgage payment (PITI).
  4. Reverse Engineer the Home Price: The calculator then works backward to find a home price where the total monthly payment—including principal, interest, estimated property taxes, and homeowners insurance—equals that $2,100 allowance.

Factors That Influence Affordability

  • Interest Rate: A lower interest rate significantly increases your buying power. A 1% difference in rate can change your affordable loan amount by tens of thousands of dollars while keeping the monthly payment the same.
  • Down Payment: The more you put down, the less you need to borrow, which lowers your monthly P&I payment. A down payment of 20% or more also typically eliminates the need for Private Mortgage Insurance (PMI), further reducing monthly costs.
  • Existing Debts: Every dollar spent on a car loan or credit card is a dollar that cannot be used for a mortgage. Paying down existing high-interest debt is often the fastest way to increase your homebuying budget.
  • Taxes and Insurance: These are often overlooked. In high-tax areas, property taxes can make up a significant portion of your monthly PITI payment, reducing the loan amount you qualify for.

Remember, this calculator provides an estimate. For a true picture of your buying power, you should seek pre-approval from a qualified mortgage lender who will review your credit score and verify your income and assets.

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