How Much Loan Can You Afford?

What Is Loan Affordability?

Loan affordability is the maximum loan amount you can realistically handle based on your income, debts, and monthly expenses. Lenders evaluate this using your debt-to-income ratio (DTI), which is the percentage of your gross monthly income that goes toward paying debts.

A common starting point is the 28/36 rule, which suggests spending no more than 28% of your gross monthly income on housing costs and no more than 36% on total debt payments. This guideline helps you check whether a potential loan fits your budget.

While the 28/36 rule is a helpful benchmark, your actual affordability may vary based on your down payment, interest rate, loan term, and other financial obligations.

Sources: JPMorgan Chase, Yahoo Finance, Zillow

Key Factors: Income, Debt, Expenses, and Down Payment

Your income and debt determine your DTI, but your monthly expenses and down payment also shape what you can afford. A larger down payment reduces the loan amount you need, which lowers your monthly payment. In contrast, high monthly expenses, such as property taxes and insurance, increase the true cost of a loan.

When using an affordability calculator, you can input the interest rate and the principal and interest payment amount to calculate the maximum loan amount you can afford. This approach helps you see the impact of different loan amounts and rates on your monthly budget.

• Gross monthly income: your income before taxes and deductions.
• Total minimum monthly debt payments: includes credit cards, student loans, auto loans, and other recurring debts.
• Monthly expenses: property taxes, homeowners insurance, and other costs not included in principal and interest.
• Down payment: a larger down payment lowers the loan amount and monthly payment.

Sources: Zillow, Consumer Financial Protection Bureau

How to Calculate Your Debt-to-Income Ratio (DTI)

Your DTI is a key number for lenders. To calculate it, divide your total minimum monthly debt payments by your gross monthly income and multiply by 100 to get a percentage.

A DTI of 36% is generally considered good or ideal, while a DTI of 51% or higher is considered high by lenders.

• A DTI of 36% or lower is generally considered good.
• A DTI of 51% or higher is considered high by lenders.
• The maximum DTI for a conventional loan through an Automated Underwriting System is 50%.
• The maximum DTI for an FHA loan through an Automated Underwriting System is 55%.

Sources: Zillow

Using the 28/36 Rule as a Starting Point

The 28/36 rule is a guideline that can help you gauge how much you can afford. It suggests allocating no more than 28% of your gross monthly income to housing costs and no more than 36% to total debt payments. This rule is common because it keeps your housing and overall debt within manageable limits.

For example, if your gross monthly income is $10,000, the rule suggests you could allocate $2,800 for housing and $3,600 for total debt payments. This gives you a ballpark figure to work from when considering a loan.

Sources: JPMorgan Chase, Yahoo Finance

Step-by-Step Example: Computing an Affordable Loan Amount

Let's apply the 28/36 rule with a concrete example.

That is the maximum loan amount you could afford before accounting for a down payment or other debts.

This example is illustrative only. Your actual rate, term, and taxes will differ. Also, remember the 36% total debt limit: if you have other monthly debt payments, reduce the housing budget accordingly.

• Step 1: Determine your gross monthly income.
• Step 2: Multiply by 0.28 to get your housing payment cap.
• Step 3: Subtract estimated taxes and insurance to find the principal and interest budget.
• Step 4: Choose a realistic interest rate and loan term.
• Step 5: Use an affordability calculator to find the loan amount that matches that monthly payment.

Sources: Consumer Financial Protection Bureau, JPMorgan Chase, Yahoo Finance

Affordability Calculator Explained (Inputs and Outputs)

An affordability calculator helps you estimate the maximum loan amount you can afford based on your monthly budget. Instead of entering a loan amount to see your payment, you enter your desired monthly payment, interest rate, and loan term, and the calculator works backward to show the loan amount.

Key inputs include your gross monthly income, total monthly debt payments, monthly housing budget, down payment amount, interest rate, and loan term. The primary output is the maximum loan amount you can afford under those assumptions.

Be aware that many mortgage calculators only calculate the principal and interest payment, excluding property taxes, homeowners insurance, and other costs. Not all calculators include those estimates, so review the assumptions before relying on the result.

Sources: Consumer Financial Protection Bureau

Limitations of Affordability Estimates

Affordability calculators and the 28/36 rule provide useful starting points, but they have limitations. Many mortgage calculators only calculate the principal and interest payment, excluding property taxes, homeowners insurance, and other costs. Your actual monthly housing payment will be higher once these are included.

DTI limits can vary by lender and loan type, and the 28/36 rule is not a strict requirement. Some borrowers may qualify with a higher DTI, while others may find a lower DTI more comfortable. Additionally, interest rates fluctuate, and the rate you use in your calculations may not be the rate you ultimately receive.

• Principal and interest are not the only costs—property taxes, insurance, and HOA fees add up.
• DTI limits vary by lender and loan program.
• The 28/36 rule is a guideline, not a guarantee of approval.
• Interest rate assumptions can change your monthly payment significantly.

Sources: Consumer Financial Protection Bureau, Zillow