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Mortgage Affordability Calculator

Determine your maximum home buying budget based on your income, debts, and current mortgage rates using standard lender debt-to-income ratios.

Exclude current rent/mortgage.
Property tax + Homeowners insurance.

Understanding Home Affordability and DTI Ratios

When lenders determine how much money they are willing to lend you for a home, they don't just look at your salary. They focus heavily on your Debt-to-Income (DTI) ratio. This calculator uses the industry-standard "28/36 rule" to estimate your budget.

What is the 28/36 Rule?

This is a conservative guideline used by many financial institutions to ensure you aren't overextending yourself financially.

  • The Front-End Ratio (28%): Your proposed monthly housing expenses—including principal, interest, property taxes, and homeowners insurance (collectively known as PITI)—should not exceed 28% of your gross monthly income.
  • The Back-End Ratio (36%): Your total monthly debt obligations—including your new housing PITI plus any existing payments for cars, student loans, or credit cards—should not exceed 36% of your gross monthly income.

Lenders will calculate both ratios based on the inputs you provide. Your maximum affordability is usually dictated by whichever of these two limits is reached first.

Factors Influencing Your Results

  • Interest Rates: A higher interest rate significantly increases your monthly payment, thereby reducing the total loan amount you can afford on the same income.
  • Existing Debt: High monthly payments for cars or credit cards eat into your 36% back-end limit, directly reducing the amount left over for a mortgage.
  • Down Payment: The more you put down, the higher the final home price you can afford, as the loan amount calculated based on your income is added to your cash down payment.
  • Taxes and Insurance: In high-tax areas, a significant portion of your allowable monthly payment goes to taxes rather than principal and interest, lowering your purchasing power.

Example Scenario

Let's say a household has a gross annual income of $96,000 ($8,000/month). They have car payments totaling $600/month. They have saved $50,000 for a down payment and qualify for a 6.5% interest rate on a 30-year term. They estimate taxes and insurance at $4,200/year ($350/month).

Using the 28/36 rule:

  1. Front-End Limit (28%): $8,000 * 0.28 = $2,240 max for PITI.
  2. Back-End Limit (36%): $8,000 * 0.36 = $2,880 total allowed debt. Subtracting the $600 existing debt leaves $2,280 for PITI.

The limiting factor here is the front-end ratio ($2,240). After subtracting the $350 for taxes/insurance, they have $1,890 available for principal and interest. At a 6.5% rate over 30 years, this payment supports a loan of approximately $299,000. Adding their $50,000 down payment, their maximum affordable home price is roughly $349,000.

Note: This calculator provides an estimate based on standard guidelines. Actual lender qualification depends on credit scores, employment history, and specific loan program requirements.

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