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Buying power is set by your income, debts, down payment, and the rate you qualify for. A lower rate buys more house for the same payment, so get your real numbers before you start looking.
How much home you can afford depends on four inputs: your gross income, your monthly debts, your down payment, and the rate your credit profile earns. Lenders cap your housing payment and your total debt with debt-to-income limits, so a higher rate reduces the loan amount the same income supports. The CFPB's owning-a-home tools walk through the true monthly cost, including taxes, insurance, mortgage insurance, and maintenance, not just principal and interest. Ask Patrick how current rates affect what you can afford.
A simple way to see the rate effect: on a $300,000 30-year fixed loan, a 6.5% rate carries a principal and interest payment near $1,896 a month, while a 7.5% rate is near $2,098. That is roughly $200 more per month for the same loan amount, which is why buying power shifts so quickly when rates move. For every half point of rate, expect your borrowing power to change by several thousand dollars.
The number that matters is not an online calculator output. A pre-approval reviews your credit, verifies your income and debts, and applies today's rate to set a firm loan amount. In a competitive San Antonio market, the pre-approval also tells sellers and their agents that your offer can actually close, which matters as much as the price in a multiple-offer situation.
The rate effect on your payment
On a $300,000 30-year fixed loan, a 6.5% rate carries a principal and interest payment near $1,896 a month, while a 7.5% rate is near $2,098. That is roughly $200 more per month for the same loan amount, which is why buying power shifts so quickly when rates move.
The meaning: your rate does not just change your payment, it changes how much house your same income can carry. A lower rate buys more house for the same monthly number.
The real-world consequence: for every half point of rate, expect your borrowing power to change by several thousand dollars. That is the difference between the home you want and the one you settle for.
Why the Full Payment Beats the Rate
Texas has no state income tax but property taxes and homeowners insurance are real line items, so the payment that matters is principal, interest, taxes, insurance, and any HOA dues added together. Two homes at the same price can have meaningfully different all-in payments based on tax rate and insurance cost.
The money consequence: on a typical Texas home, taxes and insurance can add $400 to $700 a month on top of principal and interest. That is the payment you actually write, and it is the number your budget has to hold.
The real-world play: never compare two homes by price alone. Compare the all-in payment, because the cheaper-priced home can carry the heavier monthly load.
The 28% rule as a starting point
I use the 28% rule when talking to buyers: your total housing payment should not exceed 28% of your gross monthly income. At current rates, that means a buyer earning $80,000 a year can afford roughly a $280,000 to $320,000 home depending on taxes and insurance.
The meaning: the rule is a guardrail, not a law. It keeps your housing cost from swallowing the rest of your life.
The real-world consequence: every situation is different, which is why I run personalized numbers for every client instead of relying on online calculators.
Get a Number Before You Shop
I run the full payment at today's rate for every buyer, then set a price range we both trust. That turns the search from guessing what you can afford into matching homes to a number you already know works.
The real-world play: a pre-approval reviews your credit, verifies your income and debts, and applies today's rate to set a firm loan amount. In a competitive San Antonio market, that also tells sellers your offer can actually close, which matters as much as the price in a multiple-offer situation.
Ask Patrick about how rates affect affordability
Get a straight answer on how rates affect affordability and what it means for your payment and budget.
Related Questions
More questions about affordability and rates, answered next.
Want to Know Exactly What You Can Afford?
Patrick will run your numbers and tell you exactly what price range works with your income, down payment, and credit.
Answered by Patrick Kevin Fagan
Texas Real Estate Sales Agent #454749, AXEN Realty LLC · Senior Loan Officer, NMLS ID #877741, NEXA Mortgage, LLC
Call or text: 210-317-6514
Sources
- https://www.consumerfinance.gov/owning-a-home/
- https://www.hud.gov/helping-americans/loans
- https://www.fhfa.gov/
Researched: October 2, 2026
Patrick Kevin Fagan is a Texas licensed real estate sales agent (TREC #454749) with AXEN Realty LLC and a mortgage loan officer (NMLS #877741) with NEXA Lending (NMLS #1660690). Equal Housing Opportunity.
