This is probably the first question anyone asks when they start thinking about buying a home. And the answer you get from an online calculator is usually not the full picture.
Those calculators are fine as a starting point. But they do not know your full financial situation, they do not factor in the loan programs you might qualify for, and they definitely do not account for what actually makes sense for your life, not just what a lender will approve you for.
Let me walk you through how affordability actually works, what lenders are looking at, and how to think about this in a way that leads to a good decision.
How Lenders Determine What You Can Afford
When you apply for a mortgage, the lender is not just looking at your income. They are running a specific set of calculations that measure your ability to repay the loan. Here are the big ones.
Debt-to-Income Ratio (DTI)
This is the most important number in the equation. Your DTI is the percentage of your gross monthly income that goes toward debt payments. Lenders look at two versions:
- Front-end DTI: Your proposed housing payment (mortgage, taxes, insurance, HOA if applicable) divided by your gross monthly income. Most lenders want this under 31% for FHA, though conventional can be flexible.
- Back-end DTI: All of your monthly debt payments (housing plus car loans, student loans, credit cards, personal loans) divided by your gross monthly income. Most lenders want this under 43-50%, depending on the loan type and your overall profile.
Example: If your household income is $8,000 per month gross, and your total monthly debts including the proposed mortgage are $3,500, your back-end DTI is about 44%. That is within range for most loan programs.
Credit Score
Your credit score does not directly determine how much house you can afford, but it affects the rate you qualify for, which affects your monthly payment, which affects your DTI. Higher score typically means better rate, which means more purchasing power.
For context in 2026:
- FHA loans: 580 minimum for 3.5% down
- Conventional: 620 minimum, with better pricing at 740+
- VA: No hard minimum from the VA, but most lenders want 580-620+
Down Payment and Savings
How much you put down changes the math. A larger down payment means a smaller loan, lower monthly payment, and potentially no mortgage insurance. But you also need to keep reserves. Lenders want to see that you are not draining your entire savings to close. Having two to three months of payments in reserve after closing is a common expectation.
Employment and Income Stability
Lenders want to see consistent income, typically two years of employment history. If you are salaried, this is straightforward. If you are self-employed, commissioned, or have variable income, the documentation requirements are more involved but absolutely doable.
What the Online Calculators Get Wrong
Most affordability calculators ask for your income, debts, and a rough credit score, then spit out a number. Here is what they miss:
They do not account for your actual loan program. FHA, VA, and conventional all have different guidelines for DTI, insurance costs, and allowable ratios. The same income can qualify you for very different amounts depending on the program.
They ignore Arizona-specific costs. Property taxes, homeowner's insurance, and HOA fees vary significantly by location. A home in Gilbert and a home in Tucson at the same price can have noticeably different monthly payments.
They do not factor in down payment assistance. Arizona has several down payment assistance programs that can reduce your out-of-pocket costs significantly. If you qualify, your effective purchasing power changes.
They show you the maximum, not the comfortable number. Just because a lender will approve you for a certain amount does not mean that is what you should spend. I always encourage clients to think about what monthly payment fits their life, not what the maximum approval looks like.
A Better Way to Think About Affordability
Instead of asking "how much house can I afford," I encourage my clients to flip the question: "What monthly payment am I comfortable with?"
Start with your take-home pay. Look at what you currently spend on housing. Think about what you want your life to look like after you buy. Do you want to travel? Save for your kids' college? Have room in your budget for emergencies? A mortgage should fit into your life, not take over it.
A Practical Framework
Here is a simple approach I walk people through:
- Take your gross monthly household income. This is before taxes and deductions.
- Multiply by 0.28 to 0.33. This gives you a reasonable range for your total housing payment (principal, interest, taxes, insurance, and any HOA).
- Compare that to your current rent or housing cost. If the number is close to what you are already paying, the transition is comfortable. If it is significantly higher, think about whether you are ready for that.
- Factor in the full picture. Remember to account for maintenance, utilities, and the other costs of owning a home that do not show up in your mortgage payment.
Real Scenario for Arizona in 2026
Let me sketch a realistic example. A household earning $90,000 per year gross works out to $7,500 per month. Using a conservative 30% target for housing, that is $2,250 per month for the total housing payment.
With current market conditions, that payment can support a purchase in the $300,000 to $375,000 range depending on your down payment, loan type, property taxes, and insurance. In the Phoenix metro area, that range puts you in the mix for condos, townhomes, and single-family homes in several communities.
That is a general illustration. Your actual number could be higher or lower based on your specific debts, credit profile, and the loan program that fits you best.
The Conversation That Actually Matters
Here is what I want you to take away from this: online tools are a starting point, not an answer. The real answer comes from a conversation where we look at your complete picture, including income, debts, credit, savings, and what you want your financial life to look like.
I run the actual numbers. I show you what different loan programs look like for your situation. I tell you honestly whether the math works and where the comfortable zone is, not just the maximum.
If you are at the stage where you are wondering what you can afford, that is the perfect time to have this conversation. No application required. No commitment. Just clarity on where you actually stand.
Reach out whenever you are ready. I will walk you through it.
Cory Graciano | Cory the Mortgage Coach | NMLS #1874864 | Licensed through Rate.com