STL Home Buyer Journey
George Kindler
13 Years Of Real Estate Experience At Your Fingertips
Your lender's approval number and your real affordability number are not the same thing. What the math actually looks like across St. Louis price points -- and what lenders will not tell you.
Lenders calculate your maximum loan amount based on your debt-to-income ratio (DTI) -- total monthly debts cannot exceed 43% to 50% of your gross monthly income, depending on loan type. They use gross income, not take-home pay. And they use an estimated property tax rate that is often a county average, not the actual rate for the specific zip code you are targeting.
The result is a pre-approval number that represents the maximum you can borrow -- not the payment you can sustain comfortably over 30 years in a specific St. Louis neighborhood.
The following uses a 6.75% 30-year fixed rate, 5% down, 28% front-end DTI guideline (housing costs as a share of gross income), and a 1.5% effective property tax rate. Actual requirements vary by lender, loan type, and zip code.
| Home Price | Down (5%) | Monthly PITI (est.) | Income Needed (28% DTI) | Income Needed (36% DTI) |
|---|---|---|---|---|
| $150,000 | $7,500 | $1,050 | $45,000/yr | $35,000/yr |
| $200,000 | $10,000 | $1,360 | $58,300/yr | $45,300/yr |
| $250,000 | $12,500 | $1,680 | $72,000/yr | $56,000/yr |
| $300,000 | $15,000 | $2,000 | $85,700/yr | $66,700/yr |
| $350,000 | $17,500 | $2,320 | $99,400/yr | $77,300/yr |
| $400,000 | $20,000 | $2,640 | $113,100/yr | $88,000/yr |
The front-end DTI (housing costs only) guideline of 28% is conservative. Most conventional lenders allow up to 43% back-end DTI (all debts including housing). FHA loans allow up to 50% back-end DTI with compensating factors. This means lenders will often approve buyers at income levels below the 28% column above.
The question is not what the lender will approve. The question is what you can actually sustain when a $6,000 HVAC replacement comes up in year 3, or when a job disruption creates a few months of financial pressure. Being approved for the maximum and buying the maximum are two very different decisions.
If you are buying with a partner, both incomes count toward qualifying -- but both debt loads also count. A household where Partner A earns $55,000 and Partner B earns $45,000 has $100,000 combined gross income and qualifies at a significantly higher price point than either individually. However, if Partner B has $600/month in student loan payments, that reduces the available DTI cushion for housing costs.
Run the math as a household, not individually, and include all recurring debts: car payments, student loans, minimum credit card payments, personal loans.
The right question is not "what is the maximum I can be approved for?" It is "what monthly payment can I sustain for 30 years across different life scenarios?" Run the numbers with a 10% income reduction, a major unexpected repair, and a new car payment. If the housing payment is still manageable in those scenarios, you have found your real number -- not your maximum approval.
What the pre-approval letter actually means -- and what it does not. Mortgage Pre-Approval in St. Louis → → True monthly cost including real tax rates by St. Louis zip code. St. Louis Affordability by Zip Code → → Once you know your number -- how to search without being tracked and sold. How to Use Zillow Without Getting Used → →How much income do you need to buy a $200,000 home in St. Louis?
At a 6.75% rate with 5% down and a 28% front-end DTI guideline, you need approximately $58,000 in annual gross income to buy a $200,000 home in St. Louis. With a more lenient 36% guideline (and no other debts), around $45,000 in gross income may qualify. Actual requirements vary by lender, your existing debt load, and the specific zip code's property tax rate.
What debt-to-income ratio do I need to buy a house in Missouri?
Most conventional lenders require a back-end DTI (all debts including housing) of 43% or less. FHA loans allow up to 50% with compensating factors. The front-end ratio (housing costs only) is typically held to 28% to 31% by conservative lenders. These are maximums -- not targets. A DTI below 36% gives you more financial flexibility and often better rate pricing.
Can two incomes help me buy a more expensive home in St. Louis?
Yes. Both incomes count toward qualifying, which substantially increases your purchase power. However, both debt loads also count. Run the combined household DTI including all debts for both borrowers. The resulting qualifying income is usually much stronger than either individual income, but the combined debt picture may limit gains if one partner carries significant student loans or car debt.
Why does my lender say I can afford more than I think I can?
Lenders calculate the maximum loan you qualify for under their guidelines -- not the payment that optimizes your financial stability. They use gross income, not take-home pay. They may underestimate taxes for your target zip code. They do not account for maintenance reserves, utility increases, or life events. The pre-approval is a ceiling, not a recommendation.
This is one piece of the St. Louis home buying process. See how it all fits together:
š Complete St. Louis Buyer Guide ā
Grew up in South St. Louis, lived in Dogtown for 6 years, now in South County. You'll find us at White Flag Church on Sundays. This is my city, and I know it well.
Questions about what you are reading? I answer personally -- no team, no handoff.