Mortgage underwriters strictly use your gross pre-tax income to calculate DTI ratios, not your take-home pay after taxes and 401(k) deductions. However, because you live on your net pay, it is essential to budget conservatively to ensure you have sufficient post-tax cash for living expenses, food, and utilities.

PMI is insurance that protects the lender in case you default on your loan. If you put down less than 20% on a conventional mortgage, PMI typically costs between 0.3% and 1.5% of the original loan balance annually ($100–$250/month). This monthly charge counts directly toward your DTI ratios and reduces the maximum loan amount you qualify for.

Yes, but Fannie Mae and Freddie Mac guidelines require a minimum 2-year verified history of receiving bonus, commission, or overtime pay from your employer to establish that the variable income is stable and likely to continue. Lenders typically average the past 24 months of variable earnings.

You can still qualify! While 36% is the standard benchmark, conventional loans regularly approve back-end DTIs up to 43% or even 45% if you have 'compensating factors'—such as a credit score above 740, a down payment of 10% or more, or 6+ months of cash reserves in savings after closing.

Property taxes have a huge impact. For example, in New Jersey or Texas where property taxes average 2.2%, a $400,000 home incurs roughly $733/month in property taxes alone. In Colorado or Hawaii where rates are near 0.5%, the same $400,000 home costs only $166/month in taxes, freeing up nearly $567/month in borrowing capacity for principal and interest.

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