Will a Personal Loan Affect a Mortgage Application?

Used strategically, a personal loan can help your mortgage application.

family of five standing in front of home with dad holding up keys
family of five standing in front of home with dad holding up keys


Image source: Getty Images.

When you're applying for a mortgage, any debts you have -- auto loans, student loans, credit cards, and personal loans -- can affect how much you can borrow and whether you can qualify for a mortgage in the first place.

When lenders look at your mortgage application, the most important thing isn't necessarily your credit score or credit history, but whether you can afford the monthly payments in the first place. To that end, your monthly payments on any non-mortgage debts are a vital piece of the puzzle.

How personal loans affect your mortgage application

Mortgage underwriting standards vary by bank and mortgage program, but all lenders will evaluate your "front-end debt-to-income (DTI) ratio" and your "back-end DTI ratio." Your front-end DTI ratio is the percentage of your monthly gross income that you spend on housing expenses, and most mortgage lenders want it to stay below 28%. Your back-end DTI ratio is the percentage of your monthly gross income that you spend on housing expenses plus all debts combined, and it typically needs to be under 36% if you're trying to get a mortgage.

From a lender's perspective, housing expenses include monthly payments for principal, interest, taxes, and insurance (collectively known as PITI). Any homeowner's association dues, if applicable, are also included.

So if you earn $60,000 per year in gross income, your monthly gross income is $5,000. Thus, to qualify for a conventional mortgage, your monthly payments for the home (PITI plus any HOA dues) would have to be less than $1,400 per month ($5,000 x 28% = $1,400).

In addition, you would also have to spend less than 36% of your gross income on all your debts, including housing costs. If you earned $5,000 per month, then you could spend no more than $1,800 per month combined on housing costs (PITI plus HOA dues) and payments on other debts like credit cards, student loans, or personal loans.

DTI

Gross Monthly Income

DTI Limit

Max Monthly Payments

Front-end ratio (housing costs only)

$5,000

28%

$1,400

Back-end ratio (all debt)

$5,000

36%

$1,800

Source: Author.

In this example, the difference between the front-end ratio (maximum monthly housing costs of $1,400) and back-end ratio (maximum monthly payments on all debt of $1,800) is $400 per month. This tells us that you can have up to $400 per month in non-housing debt payments before they start affecting the potential amount of your mortgage. After the first $400, each additional dollar spent on non-housing debt payments would reduce how much could be spent on housing costs.