How Does Debt Affect How Much House I Can Afford?

Here is the money problem, Patriot Nation: you make a good income, you have a target neighborhood, and then you sit down to figure out how much house you can actually carry, and every car payment and card balance you own quietly shrinks the answer. Debt is not a judgment, it is math, and the math is very predictable. Let's run the numbers the way lenders actually do and show you exactly what your debts are costing you.

Get help planning your purchase and what your debt means for it.

What debt means for the math: the two ratios

Debt cuts directly into buying power. Lenders calculate your total monthly obligations, including the proposed mortgage payment, car loans, student loans, credit card minimums, and other debts, then divide by your gross monthly income. That debt-to-income ratio, or DTI, sets the ceiling on the loan you can get, and most programs cap total DTI around 43% to 50%. ^[1] Consumer Financial Protection Bureau.

Lenders look at two ratios, and knowing both keeps you from getting blindsided. The front ratio is the proposed housing payment alone, principal, interest, taxes, insurance, and HOA dues all together. The back ratio adds every other monthly debt on top. In Texas that housing payment is fat, because property taxes and insurance are real money here. ^[2] Texas Comptroller. ^[3] Consumer Financial Protection Bureau.

The worked example: $84,000 a year, on paper

Let's make it real, the way I run it on the board in my videos. Say your household makes $84,000 a year, which is $7,000 a month. On an FHA or conventional loan, lenders are comfortable letting up to 38% of that gross income go to the housing payment, so the front ratio lands around $2,660. That one number has to cover principal, interest, taxes, insurance, HOA dues, and mortgage insurance, all inside it.

Now stack the back ratio on top. FHA allows a total around 54% of income, which on $7,000 a month is about $3,780. Subtract the $2,660 housing payment, and you have roughly $1,120 a month of room for everything else: car payments, cards, student loans. A conventional loan squeezes that total closer to 50%. The instant you understand that math, you understand why debt is the gatekeeper to a bigger house.

• The $1,120 example: a buyer with that much in other monthly debts has spent their back-ratio room before the house is even in the picture.
• The low-debt example: the same income carrying only $400 a month in debts frees up more than $700 of monthly capacity for the house payment, which steps up the price range you can shop.
• The Texas factor: because taxes and insurance live inside the housing payment, the price point you can carry here is set by the total payment, not just the loan payment.

What counts as debt and what does not

Lenders count every recurring monthly obligation that shows up on your credit report: car loans, student loans, credit card minimums, personal loans, child support, and alimony. They also count student loans even in deferment, using a calculated payment, because they want to protect you from a future spike.

Your rent does not add to the back-end ratio as a repayment debt, but your rent history still tells a lender how you handle a regular housing payment and gets verified. And cards matter at the minimum payment, not the full balance, which is exactly why paying balances down is the fastest way to shrink the number.

The fix that works before you ever apply

The fix is usually mathematical: pay down revolving balances to lower their minimums, keep payments current, and avoid adding new debt before you apply. ^[3] Consumer Financial Protection Bureau. Concretely, that means:

1. Pay down the cards with the highest utilization first; the minimums drop and the ratio drops with them.
2. Do not open new credit, co-sign, or buy a new car in the six months before you apply.
3. Keep every payment current and fix any errors on your credit report that inflate your debt.
4. Bring a bigger down payment or larger reserves, because compensating factors can help a lender approve a higher ratio.

The real-world money consequence

Every dollar of monthly debt is a dollar the house payment cannot use. On a $100,000 income, a buyer carrying roughly $1,300 a month in debts lands near a certain price range at typical buying power, while the same income carrying only a few hundred dollars a month steps up meaningfully, because the total payment ceiling is what actually drives the price you can shop. That gap is not abstract. It is the difference between the starter home and the one you actually wanted.

The good news is that debt is the one driver of your loan you can change fastest. Run your numbers early, clean up the debt you can, and let the math decide the price range you walk into. That is how a buyer stops guessing and starts shopping with a real number. The full debt-to-income walkthrough lives on its own page if you want to go deeper. Make it a great one.

Watch Patrick run the affordability math

This is the video where I put real incomes, real debts, and real Texas payments on the board and show what each income level can actually buy.