There Are Three Different Answers
"How much can I afford?" seems like a single question with a single answer. It's actually three different questions — and the answers are often very different numbers.
What a lender will approve you for
This is the maximum loan amount you qualify for based on your income, credit, and debts. It's the upper ceiling, not a recommendation.
What fits comfortably in your monthly budget
This is what you can actually pay each month — covering housing plus all your other financial goals — without feeling financially stretched.
What aligns with your long-term goals
This considers retirement savings, travel, family plans, and career flexibility. A home that takes everything has long-term consequences.
The goal of this guide is to help you understand how all three numbers work — so you can confidently choose the one that's right for your life, not just the largest one a lender will allow.
Step 1: Know Your Gross Monthly Income
Lenders evaluate affordability based on your gross income — the amount you earn before taxes and deductions, not your take-home pay. This matters because the same gross income looks very different after taxes depending on your filing status, retirement contributions, and other deductions.
Calculating your gross monthly income:
If your income is variable — commission-based, seasonal, or from self-employment — lenders will average it over two years. They use your lower taxable income, not your best year.
See exactly what documentation lenders require to verify your income. Read the guide →
Step 2: Understand Your Debt-to-Income Ratio
Your () is the most important number in the affordability equation. It compares your total monthly debt payments to your gross monthly income.
The formula:
Monthly debt payments ÷ Gross monthly income = DTI
(Expressed as a percentage)
"Monthly debt payments" includes every required payment that appears on your — car loans, student loans, credit card minimums, personal loans, and the new you're applying for.
Example: Gross income $7,500/month
General DTI guidelines:
measures what you technically qualify for. It doesn't account for retirement savings, childcare, or other lifestyle costs that don't appear on a .
Step 3: Know Your Full Monthly Payment (PITI)
Most calculators show you the and interest payment. Your actual monthly housing cost is larger — it includes four core components that lenders always consider together.
Principal
The portion of each payment that reduces your loan balance. In early years this is a small fraction of the total.
Interest
The lender's fee for borrowing the money. In the early years of a mortgage, most of your payment goes here.
Taxes
Property taxes collected monthly and held in escrow. These vary significantly by location and can add hundreds per month.
Insurance
Homeowners insurance, required by your lender. PMI is added here if your down payment is below 20%.
If your home is part of an , add those monthly dues to for the true total. A home with a $300 fee is effectively $300 more expensive per month than a comparable home without one.
The housing ratio lenders use:
Lenders typically prefer that your total monthly housing payment (PITI) stays at or below 28–31% of your gross monthly income. This is separate from, and stricter than, the total DTI limit.
Calculate your complete monthly payment
The Mortgage & Ownership Cost Calculator breaks down principal, interest, property taxes, insurance, PMI, and HOA — giving you the full number, not just the mortgage.
Open Mortgage CalculatorWhat Affects Your Monthly Payment Most
Many buyers focus only on the home price. But the monthly payment is shaped by five separate variables — and some of them matter more than people expect.
Interest rate
High impactA 1% difference in rate on a $350,000 loan changes your monthly payment by roughly $200 and costs tens of thousands more in interest over 30 years.
Home price
High impactThe base number everything builds on. Every $50,000 in home price adds roughly $200–$250/month to a typical 30-year mortgage.
Property taxes
High impactTwo identical homes in different counties can have property tax bills that differ by thousands per year. Always verify the actual tax for a specific address.
Down payment
Moderate impactMore money down lowers the loan amount and may eliminate PMI, meaningfully reducing the monthly payment.
Loan term
Moderate impactA 15-year loan has a higher monthly payment than a 30-year, but you'll pay significantly less interest over the life of the loan.
The Qualify vs. Afford Distinction
This is where many buyers get into financial trouble — not because they made a bad decision, but because no one clearly explained the difference.
A lender's job is to determine whether you can qualify for a loan based on verifiable income, credit, and debt. Their guidelines don't account for anything that doesn't show up in your financial documents.
What lenders measure:
- Gross income
- Credit score
- Existing debt payments
- Employment history
- Assets
What lenders don't see:
- Childcare costs
- Retirement contributions
- Irregular expenses
- Travel or lifestyle spending
- Career change plans
Before relying on a number as your budget, run your own honest version of the math. What would your monthly life look like if the was X? Would you still contribute to retirement? Handle unexpected expenses? Save for other goals?
A useful test: If buying this home means you can't save for retirement, take a vacation, or handle a $3,000 car repair without stress — it may be more home than you actually want to own.
Don't Forget the Upfront Cash
Affordability isn't only about the monthly payment. Before you can make any monthly payment, you need enough the deal. Buyers who deplete their savings on day often find themselves in a financially vulnerable position as new homeowners.
Down payment
3–20%+ of the purchase price
Closing costs
2–5% of the purchase price
Emergency fund (post-closing)
3–6 months of living expenses
Move-in expenses
Moving, immediate repairs, furnishings
The goal isn't to arrive at with exactly enough. It's to close and still have a financial cushion for what comes next.
See the full breakdown of what you'll pay at closing beyond the down payment. Read the guide →
The Five-Question Affordability Test
Before deciding on a home price, honestly answer these five questions. If you can say yes to all five, you're looking at a home that's affordable not just on a lender's spreadsheet, but in your actual life.
Can I qualify for this mortgage?
Your DTI is within acceptable range and your credit score meets the loan requirements.
Can I comfortably make the monthly payment?
After PITI (and HOA if applicable), you still have room for savings, retirement contributions, and normal life expenses.
Can I cover all the upfront cash required to close?
Down payment + closing costs + an emergency fund you won't need to spend right away.
Can I handle unexpected repairs or maintenance?
Budget roughly 1–2% of the home's value annually. A $400,000 home may need $4,000–$8,000 per year in maintenance on average.
Will I still be able to save for other financial goals after buying?
Retirement, travel, future family plans, and other priorities shouldn't disappear permanently when you buy a home.
Build a plan around your real numbers
The Homeownership Goal Planner helps you map out your savings timeline and monthly budget based on your target home price — including closing costs and an emergency fund.
Open Goal PlannerWhat Should You Do Next?
With a clear sense of what you can truly afford, here's where to focus.
Run your real numbers
Open the Mortgage Calculator and input your income, debts, and target home price. Compare the payment to your actual monthly budget — not a lender's maximum.
Mortgage CalculatorUnderstand the full cost of ownership
The monthly payment is just one part. Understanding maintenance, utilities, insurance, and long-term replacement costs gives you a complete picture before you buy.
See the full cost breakdown of owning a home. Read the guide →
Compare buying vs. renting
If you're still deciding whether buying makes financial sense for your situation, the Buy vs Rent guide and calculator can make the comparison concrete.
Read the Buy vs Rent Guide. Read the guide →