Why it matters
You saved well, the cash is ready, and the number the bank came back with does not reach the neighborhood you wanted. That conversation happens most weeks.
What it is, with an example
DTI is the share of your gross monthly income (before taxes) already going to paying debts, counting the new mortgage payment. The ceiling reaches 50%: it is the maximum allowed by the automated system of Fannie Mae (the company that buys loans from banks) on a regular bank loan (conventional).
On $6,000 a month, 50% is $3,000. Inside that has to fit the car, the cards, student loans and the full house payment: the loan payment, taxes, insurance, the insurance the lender charges when you put little down (PMI / MIP), and the association fee (HOA) if it is a condo.
| Item | Monthly |
|---|---|
| Gross income | $6,000 |
| 50% ceiling | $3,000 |
| Car | $500 |
| Cards (minimums) | $250 |
| Left for the house | $2,250 |
Why it hurts more than it looks
In that example, the car and the cards ate $750 of your ceiling. That is not $750 of house: it is tens of thousands of dollars of maximum price, because every monthly dollar compounds across thirty years of loan.
The math that surprises people. A $500 monthly car payment can be costing you up to about $74,000 of house you could otherwise reach: that is what $500 a month finances over thirty years at the current average fixed rate, 7.12% (Optimal Blue via FRED, data as of November 4, 2026). And since taxes and the home insurance also have to fit inside those $500, in practice the figure comes out lower.
So when someone is close but not there, the first thing I look at is not how much more they can save. It is which debt they can get off their back.
With your numbers, not the example. With five questions and no credit check: how many properties for sale are within your reach and what you'd pay a month.
I want to see what I can buyWhat actually lowers it
- Closing one small debt completely beats paying a little toward several. DTI counts the monthly payment, not the balance: a debt paid off disappears from the calculation entirely.
- The car is usually what moves the math the most, especially if only a few payments remain. One caveat: that holds for a financed car. If it is a lease, the payment counts in full no matter how close the end of the contract is.
- Opening nothing new while you are buying. Financing furniture before closing (the day you sign and get the keys) has killed purchases that were already approved.
- Income you can prove on paper. What cannot be proven on paper does not count, even if it comes in every month.
The advantage of DTI over savings is speed: raising available cash takes months. Getting a payment off your back can change your number in weeks.
We tell you which payment to clear first.
Which ceiling applies to you, and which payment buys back the most house, comes down to how that lender counts your income and your debts, and no table shows that. Leave us your number and we run it with you.
The 50% is the maximum allowed by Fannie Mae automated underwriting on a conventional loan, and it is the outer limit, not a permission: many paths cap lower. If a person reviews your file by hand, conventional stops at 45%, and FHA at 43% if nothing else in your file makes up for it. Each lender also applies its own rules when calculating income and debt.
Whenever you want to move ahead, we handle it with you.