When you apply for a mortgage, the lender looks closely at your debt-to-income ratio, or DTI. That’s the percentage of your gross monthly income that goes toward paying debts, including the mortgage you’re asking for. Lenders use this number to judge whether you can handle the payments. A high DTI is a red flag. It suggests you’re stretched too thin already. The good news is that you have real control over this ratio. You just need to know the right moves to make before you dive into the home buying process. The best part is that most of those moves don’t cost a dime.
Here’s the basic math. Add up all your monthly debt payments: credit card minimums, car loans, student loans, personal loans, and that new mortgage payment with taxes and insurance. Divide that total by your monthly gross income. Remember, your gross income is before any taxes or retirement contributions come out. For a conventional loan, most lenders want your total DTI under 36%, and your housing payment alone should stay below 28%. For FHA loans, the cap is often 43%. The lower your DTI, the stronger your application looks. Even a few percentage points can mean the difference between a denied application and a great interest rate.
So how do you lower your DTI? Start with your debts. The fastest way is to pay off small loans or credit card balances in full before you apply. That $150 a month you send for a motorcycle or a furniture payment? Once it’s gone, your DTI drops immediately. Target the smallest monthly payment first, not necessarily the highest interest rate. Why? Because your DTI cares about the monthly obligation, not the total balance. Eliminating a $50 minimum payment reduces your ratio just as much as a $50 reduction on any other debt.
Next, stop adding new debt. This sounds obvious, but too many buyers blow it by financing a car or opening a new credit card while preparing to purchase a home. Even “fun” buys like that 0% financing TV can count against you. Lenders look at your current obligations, and they’ll include minimum payments on any revolving accounts. If you must make a large purchase, pay cash and keep your credit utilization low. Also, don’t close an old credit card, because that can lower your available credit and raise your utilization. The general rule is to avoid all new debt for six months before starting the mortgage process.
On the income side, you can also tip the ratio in your favor. A higher gross monthly income means a lower DTI for the same amount of debt. Consider taking on a part-time job or side gig that you can document for at least a few months. Regular overtime counts too, if it shows up on your pay stubs. Just don’t fabricate income. Lenders verify everything with tax returns, W-2s, and bank statements. And if you expect a raise soon, it might be worth waiting until that raise is in your paychecks before applying.
Another powerful tactic is to lower the amount you want to borrow. The less you borrow, the smaller your monthly mortgage payment, and the easier it is to keep your DTI below the lender’s threshold. You can do this with a larger down payment. For example, on a $250,000 house, putting 20% down instead of 10% saves you $25,000 in principal, which trims your monthly payment noticeably. Even a smaller mortgage at a slightly higher rate can be better than a huge one that stretches your budget thin. You could also look at a slightly cheaper home. That doesn’t mean settling for a fixer-upper. It means being realistic about your future monthly budget.
Finally, consider adding a co-borrower. A spouse, a committed partner, or even a parent with good income and low debts can strengthen your application. Lenders add both incomes together, which can push your combined DTI down below the cutoff. Make sure everyone understands the responsibility that comes with co-signing. Done wisely, this could be the move that gets you from “maybe” to “approved.“ Then you’ll have the keys to a home that fits not just your dream, but also your budget.
