How Much House Can I Afford Based on My Monthly Payment?
Every affordability calculator asks for your income first. That's backwards. Your income tells a lender what they'll allow. It doesn't tell you what you'll be comfortable paying every month for thirty years — and those are very different numbers.
Qualified is not the same as comfortable
Underwriting will typically permit a total debt load somewhere in the mid-40s as a percentage of gross monthly income, and considerably higher on some programs with strong compensating factors. That's a ceiling, not a recommendation. It's what a lender will tolerate, calculated on income before taxes, retirement contributions, childcare, or anything else you actually spend money on.
Starting from a payment you've chosen yourself inverts the whole process. You set the constraint. The math finds the house.
What's actually inside the payment
A mortgage payment in Texas has four or five components, and principal and interest is usually only about two-thirds of it:
- Principal and interest — set by loan amount, rate, and term.
- Property taxes — high in Texas, and varying by city, county, ISD, and any MUD or PID. Verify by address.
- Homeowner's insurance — also high in Texas relative to national averages, and highly variable by carrier.
- Mortgage insurance — required on conventional loans above 80% loan-to-value and on FHA regardless; absent on VA.
- HOA dues — not escrowed, but very much part of what you pay monthly.
A calculator that only handles principal and interest will tell you that a $3,000 payment buys far more house than it does. The one on this site includes all of it.
How the reverse calculation works
Because taxes, insurance, and mortgage insurance all scale with the price, you can't solve for price algebraically in one step. The calculator narrows in on it numerically: it guesses a price, computes the full payment, and adjusts until the payment matches your target.
Then it does the same thing twice — once with a traditional structure and once with the BuyBorrow Advantage™ benefit applied — so you can see how much additional house the same monthly payment supports.
Then check the other constraint
Payment is one wall. Cash to close is the other, and a great many buyers hit it first. Once you know your comfortable payment and the price it supports, run the cash number before you go look at anything.
If the cash is the binding constraint, slide the program benefit toward the Cash Advantage side instead of the rate. Same benefit, different job.
Where should the benefit go?
Assumptions — edit any of these
On Auto, conventional mortgage insurance is estimated
from a built-in premium grid by credit range and loan-to-value, and FHA uses the factors above. Those are
illustrative approximations — the live rate card is in src/data/mi-rates.js. Override any
single file with your actual quote using the
% / yr or $ / mo control. Credit-tier rate adjustments and interested-party
contribution ceilings are applied automatically from the loan program, credit range, and loan-to-value.
Interest rate and buydown cost come from the loaded wholesale rate sheet: the base price at each rate for
your lock period, plus the loan-level price adjustments for credit, LTV, occupancy and loan size. The rate
shown is par — the cheapest rate that costs you nothing — and a buydown walks down that same
ladder for whatever the benefit actually pays for. Commission is negotiable and not set by law; the figures
above are placeholders for illustration, not an offer.
Frequently asked
What percentage of my income should go to a mortgage?
A common guideline puts housing at or under 28% of gross income and total debt at or under 36%, though real underwriting routinely allows more. Treat these as orientation rather than rules — the right number depends on your other obligations, your job stability, and your tolerance for a tight month.
How much house can I afford on a $3,000 monthly payment?
In Dallas–Fort Worth, a $3,000 all-in payment covering taxes, insurance and mortgage insurance typically supports meaningfully less house than a principal-and-interest-only calculator suggests, because Texas property taxes and insurance are both above national averages. Run it with your actual down payment and credit tier in the calculator above.
Does the calculator include property taxes and insurance?
Yes — property taxes, homeowner's insurance, mortgage insurance, and HOA dues are all included in the payment, and closing costs, prepaids, and escrow funding are all included in the cash to close.
Is this a pre-approval?
No. It's an estimate for planning, based on assumptions you can see and edit. A pre-approval requires a credit report, income and asset documentation, and an underwriter. The calculator tells you where to aim; the approval tells you what's real.
Tell me your payment. I’ll build the plan around it.
Send the monthly number you’re comfortable with and I’ll come back with a purchase range, a loan program comparison, and what the BuyBorrow Advantage™ benefit looks like on your file.