When you apply for a mortgage, it can feel a little bit like you are standing under a giant magnifying glass. You have to provide your bank statements, your tax returns and your pay stubs. It’s a vulnerable feeling! It feels like the lender is judging your life choices based on where you spend your money.
But I want to let you in on a secret: Lenders aren’t looking at your soul—they are looking at a very specific math equation. We call this your Debt-to-Income Ratio, or DTI.
Essentially, the bank wants to know: “After this person pays all their monthly bills, is there enough money left over to comfortably pay for a house and still buy groceries?”
The confusion usually starts when people try to figure out what "counts" as a debt. Does your Netflix subscription count? What about your car insurance or that "Buy Now, Pay Later" couch you just bought? Let’s clear up the confusion and look at exactly what shows up on a lender’s radar.
What is "Debt" in the Eyes of a Lender?
In the mortgage world, debt isn’t just "money you owe." It is a legal obligation to pay a creditor. Generally speaking, if a bill shows up on your credit report, it counts as debt. If it’s a monthly service (like your cell phone, your gym membership, or your car insurance), it usually doesn't count toward your debt ratio—even though it’s a bill you pay every month.
Let’s look at the four main categories of debt that matter when you’re applying for a loan.
1. The "Same Every Month" Loans (Installment Loans)
These are loans where you borrowed a specific amount of money and you are paying it back in equal chunks over time.
Auto Leases: This is the most common one. Even if you only have six months left on your car lease payment, the lender usually has to count that monthly payment against you.
Student Loans: Many people feel like they can never buy a home because of their student debt. Here is the good news: Even if your loans are in "deferment" (meaning you aren't currently making payments), we have ways to calculate a "fair" amount so you can still qualify for a home. Don't let a large student loan balance scare you away from trying!
2. The "Fluctuating" Bills (Revolving Credit)
Credit Cards: Lenders don’t look at your total balance (like $5,000) as a monthly debt. Instead, they look at the minimum monthly payment required by the card company. Even if you usually pay your card off in full, we have to use that minimum payment in our math.
Personal Lines of Credit: These work just like credit cards. If you have a balance, the minimum payment counts.
3. Other "Life" Obligations
This is a category that surprises people. Sometimes, debt isn’t about a bank; it’s about a legal agreement.
Child Support and Alimony: If you are legally required to pay these, they are considered a "fixed debt." We have to include these in your monthly outgoings because they are a primary financial commitment.
Significant Medical Debt: If you are on a formal payment plan with a hospital or a collection agency, that monthly payment will likely be factored in.
The "DTI" Equation: The Only Math You Need to Know
Once we have added up all those monthly payments, we compare them to your gross monthly income (your pay before taxes are taken out).
The Example:
You make $6,000 a month (before taxes).
Your car payment is $400.
Your credit card minimums are $100.
Your student loan "calculated" payment is $200.
Total Debt = $700.
If your new mortgage payment (including taxes and insurance) is going to be $2,000, your total monthly obligations are $2,700.
$2,700 divided by $6,000 = 45%.
In today's market, most loan programs want to see that percentage stay below 50%. If your number is higher than that, it doesn't mean you can't buy a house—it just means we might need to look at paying down a small credit card or finding a different loan program.
Don’t Make These Two Common Mistakes
Because your debt ratio is so important, the time before you buy a house is very sensitive. Here are two things you should never do without calling me first:
Don’t take out a new loan: It is so tempting to go buy a new SUV or a truck to park in the driveway of your new house. Wait! Even a small increase in your monthly debt can "max out" your ratio and make it impossible to get the mortgage.
Don’t close your accounts: You might think closing a credit card you don't use is a good thing. In reality, it can actually lower your credit score and change your math.
You Are More Than a Ratio
I know that talking about debt can feel heavy. It can bring up feelings of regret or stress. Please know that when we look at these numbers, we are looking at them with care and empathy. My goal is to be your advocate. If your "Math of You" doesn't quite add up today, we aren't going to just walk away. We’re going to sit down and figure out which debt we can pay off or restructure to get that ratio into the "sweet spot."
You’ve worked hard for your income. Let’s make sure your debt isn't standing in the way of the front door you’ve been dreaming of.