Debt-to-income Ratio For Second Home Calculator

Last Updated: Jun 21, 2025

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Are you thinking of buying a second home but confused about whether your new monthly mortgage fits your budget? Don’t worry, we have built a Debt‑to‑Income (DTI) Ratio for Second Home Calculator that will not only tell you your DTI but also give you a full picture of your financial health, taking into account all relevant factors.

In this guide, we will cover:

  • What Is the Debt‑to‑Income Ratio?
  • What is the Second Home DTI Calculator
  • How Can I use the Second Home DTI Calculator
  • Real‑World Example
Salaried person planning to buy a second home, calculating DTI

What Is the Debt‑to‑Income Ratio?

The Debt‑to‑Income Ratio is a financial metric that shows how much of your gross monthly income goes toward debt payments. It is expressed as a percentage and is used by lenders to determine whether you can afford new debt.

DTI Formula:

DTI (%) = (Total Monthly Debt Payments / Gross Monthly Income) × 100

  • Total Monthly Debt Payments: All debts you pay each month, including car loans, student loans, credit card debt, mortgage, etc.
  • Gross Monthly Income: Your monthly income before taxes, insurance, and other deductions.

What is the Second Home DTI Calculator

The Second Home DTI Calculator is a smart yet handy tool designed to help you gauge the affordability of buying a second home. It considers all the important factors to calculate your DTI ratio and assess your financial health.

How Can I use the Second Home DTI Calculator? Our calculator is built to be user friendly, allowing anyone to easily enter the following fields:

  • Gross Income Amount (monthly or annually)
  • Primary Home Payment (mortgage or rent)
  • Second Home Payment (projected monthly mortgage)
  • Loan Term (e.g 30 years)
  • Interest Rate (e.g 7%)
  • Property Taxes (monthly)
  • Home Insurance (monthly)
  • HOA Fees (monthly)
  • Other Debt Payments (credit cards, auto loans, student loans)
  • Maximum DTI Threshold (default is 43%)

After you enter your fields, the calculator instantly computes the values and shows your current DTI, projected DTI, maximum affordable payment, estimated loan amounts, and whether you qualify for a second home mortgage.

Real‑World Examples

  • Gross Monthly Income: 8,000 dollars
  • Primary Mortgage: 1,200 dollars
  • Second Home Payment: 2,000 dollars
  • Taxes/Insurance/HOA: 300 dollars
  • Other Debts: 500 dollars
  • Max DTI: 43%

Brief Results:

  • Current DTI: (1,200 + 500) / 8,000 = 21.25%
  • Projected DTI: (1,200 + 2,000 + 300 + 500) / 8,000 = 48.75%
  • Risk: High Risk (above 43%)
  • Max Affordable 2nd Home Payment: (8,000 dollars × 0.43) − (1,200 + 500) = 1,940 dollars

The results indicate that the new potential DTI ratio is higher than the 43% threshold, which means a high risk. You need to reduce your second-home payments or increase your gross income.