How much house can I afford?
How lenders calculate your maximum, why the maximum is usually not the right answer, and the three constraints that actually decide your price range.
There are two different questions hiding in this one. What will a lender approve, and what should you spend. They are rarely the same number, and the gap between them is where buyer regret lives.
How the approval math works
Underwriting is driven by debt-to-income ratio: your total monthly debt payments divided by your gross monthly income. The proposed housing payment counts in full, and so does everything on your credit report — car loans, student loans, minimum card payments, child support.
What does not count: utilities, groceries, insurance premiums, childcare, phone bills, retirement contributions, or your tax withholding. Which is exactly why the maximum approval can feel unlivable. The lender is measuring a ratio, not your life.
The three real constraints
Your price range is set by whichever of these binds first, and for most buyers it is not the one they expected.
- Debt-to-income: how much payment the guidelines will let you carry. Automated underwriting will stretch well past the old rules of thumb with strong compensating factors — reserves, high credit, low loan-to-value.
- Cash: down payment plus closing costs plus prepaid escrows plus the due diligence fee, minus any seller credit. This is the constraint that binds most often for first-time buyers.
- Comfort: the payment you are willing to make every month for years. This one has no formula and it is the only one that matters after closing.
What moves the number most
| Change | Effect on your price range |
|---|---|
| Paying off a car loan | Often the single largest lever — a $500 payment can free six figures of purchase price |
| A 40-point credit score gain | Better rate and cheaper PMI, both of which lower payment |
| Higher down payment | Lowers loan amount and can remove mortgage insurance entirely at 20% |
| Documented bonus or overtime income | Counts once there is a two-year history |
| Higher property taxes or HOA dues | Reduces your range, sometimes sharply — a $300 HOA is a real constraint |
| A rate move of 0.5% | Meaningful, but usually smaller than buyers assume relative to the items above |
Set the payment first, then work backwards
The approach I recommend: decide the all-in monthly payment you are genuinely comfortable with, then solve for the price that produces it at today’s rates with your actual taxes, insurance and HOA. That is what the affordability calculator does. Bring the number to me and we will pressure-test it against your real documents.
And leave something behind
Do not close with your last dollar. Between the first repair, the appliance that does not come with the house and the second month of double utilities, buyers who keep a few months of reserves after closing have a markedly better first year. Reserves also strengthen the file itself — they are a compensating factor underwriting genuinely credits.
Written by
Travis Nicolaysen
Loan Officer, Fairway Home Mortgage · NMLS #1782820
Questions about how this applies to your file? Call or text 704-728-4548.
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