DTI: The Secret Formula That Can Make or Break Your Mortgage

If you’re planning to buy a home and haven’t heard of Back-End DTI, let me put you ahead of 90% of other buyers. This single number can either greenlight your mortgage — or slam the brakes before you even get to house hunting.

I’m Desmond Miller, and one thing I always tell my clients is: don’t just look at what you make — understand what you’re already paying. That’s where Back-End Debt-to-Income Ratio comes in.

So, What’s Back-End DTI?
It’s the percentage of your monthly income that goes toward all your monthly debts plus your projected mortgage payment. This is what lenders use to figure out if you can really take on a home — or if it’s going to stretch you too thin.

Let me break it down using the way I look at it during an approval:

? Car notes

? Minimum credit card payments

? Student loans

? Personal loans

? Child support or alimony (if it’s court ordered)

? Your estimated monthly mortgage payment — including property taxes, insurance, and HOA if applicable

Here’s a Quick Example:
Say you make $6,000/month before taxes.
You currently pay:

$400 on a car note

$150 on student loans

$100 in credit card minimums

You’re looking at a mortgage around $2,000/month

All in, that’s $2,650 in monthly obligations. Divide that by your $6,000 income, and you’re at 44.1% DTI.

Depending on your loan program, that might be right at the edge. For example, conventional loans usually max around 45%, while FHA might stretch higher if your credit is strong.

Where We Get These Numbers From
When I review your file, I’m not guessing or going off what you “think” your bills are. Your credit report gives me the facts. If it shows you owe it — I count it. If it doesn’t (except for things like child support or IRS payments), I usually don’t.

That’s why pulling your credit early in the process is a must — not just to check your score, but to get a full picture of what’s going out every month.

My Take as a Loan Officer and Realtor:
People are often surprised that it’s not their income, but their monthly obligations, that knock them out of the running. It’s why I don’t let my clients move forward without understanding their DTI. No fluff, no guessing — just clarity.

Let’s Make It Make Sense
If you're wondering how close you are to getting approved — or just want to make sure your finances are lining up — let’s walk through it together. I’ll show you exactly where you stand and what steps to take if your DTI needs adjusting.