Home Affordability Guide:
How Much House Can You Afford?
Before you start house hunting, understand how lenders evaluate your budget and how to set a realistic price range that works for your life.
Most people start their home search by looking at listings, not spreadsheets. That is understandable, but it is also how buyers end up falling in love with a home they cannot reasonably afford. The honest question to ask before you browse a single listing is: "What price range actually works for my budget?" Not the number a lender approves you for. The number that lets you own a home and still cover the rest of your life.
This guide explains exactly how lenders calculate what you qualify for, what those ratios mean in practical dollar terms, and how to set a realistic price range that fits your income, your existing debts, and your financial goals. It also walks through the variables that shift your number significantly depending on where you live.
The Short Answer
A common guideline is to keep your total monthly housing payment at or below 28% of your gross monthly income. That payment includes principal, interest, property taxes, homeowner's insurance, and any HOA fees. On a $6,000 gross monthly income, that is roughly $1,680 per month for everything related to housing. Most lenders also want your total monthly debts, including housing plus any car loans, student loans, and credit cards, to stay at or below 43% of gross income.
Which Situation Describes You?
Affordability looks different depending on where you are financially. A few quick scenarios to help you identify the right focus for your situation:
- You have stable income but carry student loans or a car payment. Your back-end DTI is the constraint. Work through that calculation first, because your existing debts eat into the housing budget before you even start.
- You have little existing debt but a modest income. Your front-end DTI (the 28% housing limit) sets the ceiling. The focus is on what monthly payment fits within that threshold at current interest rates.
- You have saved a large down payment. A bigger down payment reduces the loan size, which lowers the monthly P&I and frees up room within your DTI limits. You may qualify for a higher price than you expect.
- You are buying in a high-tax or high-insurance area. Property taxes and insurance premiums both count toward your front-end ratio. In states like New Jersey or Illinois, those costs can account for $500 to $900 per month on a median-priced home, which is money that cannot go toward principal and interest.
Knowing which constraint is binding for you helps you focus on the right levers.
Key Terms You Need to Know
Before running any numbers, it helps to understand the terms lenders use. These show up on every mortgage pre-approval and will come up repeatedly during the buying process.
Front-End DTI
In simple terms, front-end DTI means your total monthly housing cost divided by your gross monthly income. Housing costs here include principal, interest, property taxes, homeowner's insurance, and any HOA fees. Most lenders want this at 28% or less.
Back-End DTI
In practical terms, back-end DTI refers to all of your monthly debt payments combined, including housing, car loans, student loans, credit card minimums, and any other recurring debt obligations, divided by your gross monthly income. Most conventional lenders cap this at 43%, though some programs go higher.
A third term you will encounter is PITI, which stands for Principal, Interest, Taxes, and Insurance. In simple terms, PITI refers to the four components that make up your core monthly mortgage payment. When lenders calculate your front-end DTI, PITI is what they are measuring.
The 28/36 Rule: A Useful Starting Point
The 28/36 rule is a widely cited affordability benchmark. It gives you two thresholds to check against your income.
- 28%: Your total monthly housing payment should not exceed 28% of your gross monthly income.
- 36%: All monthly debt payments combined, housing plus cars, student loans, and credit cards, should not exceed 36% of your gross monthly income.
This rule is a starting point, not a hard ceiling. FHA loans can allow back-end ratios up to 50% with compensating factors such as strong cash reserves or a high credit score. The affordability calculator on this site lets you adjust the back-end DTI limit between 36% and 50% to model different approval scenarios. Keep in mind that qualifying for a higher ratio and comfortably living within one are two different things.
A Realistic Example: $90,000 Annual Income
Take a household earning $90,000 per year ($7,500 gross monthly). They carry one car payment of $400 per month. They are looking at a 30-year mortgage at 6.8% interest, a neighborhood with a 1.2% property tax rate, and homeowner's insurance of $1,500 per year. No HOA. Here is how the math plays out:
Sample Affordability Calculation
$7,500 x 0.28 = $2,100
$7,500 x 0.43 = $3,225
$3,225 minus $400 = $2,825
The front-end limit of $2,100 is the binding constraint. That $2,100 must cover all of the following:
Varies with exact tax rate, down payment amount, and loan term
Hypothetical illustration only. Actual results depend on credit score, loan type, location, and lender requirements.
The key takeaway from this example: property taxes and insurance consume a meaningful share of the monthly budget before a single dollar goes toward the loan balance. On a $300,000 home in a 1.2% tax state, you are spending roughly $430 per month just on taxes and insurance. That is money that does not reduce what you owe. In a high-tax state with a 2.2% rate, that number jumps to around $675 per month on the same home, which pushes your affordable price ceiling down considerably.
Decision Framework: Are You Ready to Buy?
Qualifying for a mortgage and being financially prepared to own a home are related but separate questions. Use this checklist before committing to a purchase price.
- Income stability. Is your income reliably consistent? Lenders typically look for two years of employment history. Variable income, recent job changes, or self-employment add complexity.
- Emergency reserve. After your down payment and closing costs, do you still have three to six months of expenses saved? Homeownership brings unpredictable repair costs. A furnace replacement can run $4,000 to $8,000. A roof can cost $10,000 or more.
- Stay timeline. Buying generally makes financial sense if you plan to stay at least five years. Shorter timelines make it harder to recoup transaction costs such as agent commissions, title fees, and closing costs, which typically add up to 8% to 10% of the sale price when you sell.
- Monthly budget comfort. Run your post-purchase budget on paper. Add up your projected mortgage payment, utilities, maintenance (budget around 1% of home value per year), plus all your existing expenses. Does it still leave room for savings and normal life?
- Debt load. If your existing debt payments are already close to the back-end limit, adding a mortgage will push your DTI to the edge of what lenders allow. Consider whether paying down some debt before buying would improve your position.
- Credit score. A score above 740 typically unlocks the best conventional rates. Scores in the 620 to 680 range may still get FHA approval but at less favorable terms. Know your score before you apply.
How to Use the Home Affordability Calculator
The calculator on this page estimates the maximum home price you can afford based on your income, debts, and local costs. It applies both the front-end (28%) and back-end (43% default) DTI limits and returns the lower of the two as your result, since both constraints must be satisfied.
Enter your gross annual income, your existing monthly debt payments, your expected down payment, interest rate, property tax rate, annual insurance cost, and any HOA fees. The calculator works backward from your DTI limits to identify the maximum loan amount, then adds your down payment to arrive at the top of your price range.
To interpret results: treat the output as a ceiling, not a target. Many financial planners suggest buying 10% to 15% below your maximum to preserve budget flexibility. You can also use the Rent vs Buy Calculator to compare whether buying at your maximum qualifies price or renting a comparable property makes more financial sense over your expected time horizon.
What Lenders Do Not Factor In
Lenders work from a formula. It is a useful formula, but it has significant blind spots. The approval process does not account for many real monthly expenses, including:
- Childcare or eldercare costs, which can easily run $1,500 to $3,000 per month
- Health insurance premiums paid out of pocket
- Retirement contributions (401k, IRA)
- Emergency savings deposits
- College savings accounts
- Groceries, utilities, transportation, and day-to-day spending
- Travel, hobbies, or recurring personal expenses
This gap is why some buyers who borrow at the top of their approval range end up in a situation sometimes called "house poor." They can make the mortgage payment, but there is little left for anything else. Getting approved for a loan amount does not mean that amount fits your life.
A Practical Caution
Lenders approve based on what they can see. They cannot see your childcare costs, your retirement savings goals, or what you spend on food and transportation. Before accepting a pre-approval as your budget, build a full post-purchase monthly cash flow. Many financial planners suggest targeting a housing payment noticeably below the 28% ceiling so you retain enough flexibility for savings and unexpected costs.
How Down Payment Size Shapes Your Budget
Your down payment affects affordability in three direct ways.
- A larger down payment reduces your loan balance. If your monthly budget supports a $1,800 principal and interest payment, you can bid on a more expensive home with 20% down than with 5% down because you are borrowing less against the same payment capacity.
- Less than 20% down triggers PMI. Private mortgage insurance typically costs 0.5% to 1.5% of the loan amount per year. On a $300,000 loan, that is $125 to $375 per month added to your payment, which counts toward your front-end ratio and reduces how much loan you can afford within the same DTI limit.
- Down payment size can affect your rate. Lenders view borrowers with more equity as lower risk. A larger down payment can sometimes unlock a slightly better rate, which compounds over a 30-year loan.
That said, waiting years to save a 20% down payment is not the right move for everyone. Continued renting has a cost, and home prices may rise while you save. The right down payment level depends on your local market, your rent situation, and your timeline. Our guide on first-time homebuyer considerations covers down payment programs and tradeoffs in more detail.
Six Variables That Move Your Affordable Price Range
Income and existing debts set the outer boundary, but six other inputs can shift your affordable price by tens of thousands of dollars. Here is what each one does.
Interest Rate
A half-point difference in rate matters more than most buyers expect. On a $300,000 loan, the difference between 6.5% and 7.0% is roughly $95 per month. Over 30 years, that is more than $34,000 in additional interest. In terms of buying power, a 0.5% rate increase can reduce your affordable price by $20,000 to $30,000 while keeping the same monthly payment.
Loan Term
A 30-year term spreads payments over more months, so each payment is lower. That means you can qualify for a higher price at the same DTI. A 15-year term builds equity faster and costs less in total interest, but the higher monthly payment reduces how much home you can afford within the same budget.
Property Tax Rate
Property tax rates range from under 0.5% in parts of Hawaii and Alabama to over 2% in New Jersey, Illinois, and Connecticut. On a $350,000 home, moving from a 0.8% tax state to a 2.2% tax state adds nearly $490 per month to your housing payment. That shift alone can reduce your affordable price by $80,000 to $100,000.
Homeowner's Insurance
National average homeowner's insurance costs around $1,700 per year, but that figure varies widely. Coastal states such as Florida and Louisiana regularly see annual premiums of $3,000 to $5,000 or more on a median-priced home, particularly after recent insurer withdrawals in those markets. Insurance costs are divided by 12 and added to your monthly housing payment.
HOA or Co-op Fees
HOA fees count toward your front-end DTI. A condo with a $400/month HOA on a $7,500 gross income budget effectively reduces your maximum mortgage payment from $2,100 to $1,700. That translates to roughly $50,000 to $65,000 less in affordable home price compared to a single-family home with no HOA.
Back-End DTI Limit
Conventional loans typically cap back-end DTI at 43% to 45%. FHA loans may allow up to 50% with strong compensating factors, such as cash reserves of 12 or more months. Raising the back-end limit in the calculator shows a higher approved amount, but also means more of your income is committed to debt service each month.
How Location Changes the Entire Calculation
National affordability averages can be misleading because housing markets vary dramatically by region. The same $350,000 home carries very different true monthly costs depending on where it sits.
In a low-tax state such as Hawaii or South Carolina, property taxes might add $200 to $280 per month to a $350,000 home. In New Jersey or Illinois, that same home could add $650 to $800 per month in property taxes alone. Insurance adds a second layer of regional variation. The National Association of Insurance Commissioners tracks state-level premium data, and the differences between a Florida coastal home and a Midwest home of the same value can be several thousand dollars per year.
Beyond taxes and insurance, local price-to-rent ratios influence whether buying makes financial sense at all. In markets where rents are relatively high compared to home prices, the financial case for buying is stronger over a five-to-seven-year horizon. In markets where home prices have surged well beyond local incomes, renting may preserve more financial flexibility. Our Real Cost Difference guide covers how to evaluate this comparison for your specific market.
How Do Mortgage Rates Affect Home Affordability?
Mortgage rates have a direct and significant effect on how much home you can afford at a given monthly payment. When rates rise, monthly payments increase even if the purchase price stays the same. That means your DTI-constrained price ceiling falls.
To put a number on it: a buyer with a $2,000 monthly budget for principal and interest could afford roughly $335,000 at 5.5% on a 30-year loan. At 7.0%, that same $2,000 per month only supports about $300,000. A 1.5-point rate increase costs roughly $35,000 in buying power at the $2,000 payment level. The Federal Reserve's benchmark rate decisions and broader bond market conditions drive where 30-year mortgage rates sit at any given time.
Rates also affect the rent-vs-buy math. When mortgage rates are low, owning looks more attractive relative to renting because the monthly carrying cost of a mortgage drops. When rates are elevated, the monthly cost of owning a given home increases while rent prices often lag, making renting more competitive in the short term.
Beyond the Ratios: Is Buying the Right Move?
DTI ratios tell you what a lender will approve. They do not tell you whether homeownership makes sense for your situation right now.
- How long do you plan to stay? Transaction costs are high. Agent commissions, title insurance, transfer taxes, and closing costs typically run 8% to 10% of the purchase price when you combine buying and selling costs. Short stays rarely recover those costs.
- Is your income stable enough to commit to a 30-year obligation? If you anticipate a significant income change, that changes the calculation.
- Do you have cash reserves beyond your down payment? Ownership comes with maintenance. Budget 1% of the home's value per year as a rough maintenance reserve.
- Are you comfortable with illiquidity? Real estate is not easily converted to cash. If you might need access to your capital in the next two to three years, that is a risk factor worth weighing.
For a fuller picture of the long-term financial tradeoffs, see our Rent vs Buy hub, which covers the break-even timeline, opportunity cost, and how market conditions influence which option makes more financial sense over a given horizon.
You may also want to review our guide on the hidden costs of homeownership to understand what expenses sit beyond the mortgage payment itself, including maintenance, repairs, utilities, and the costs that surface when you eventually sell.
Calculate Your Affordability
Use our tools to see how different scenarios affect your budget and compare the costs of buying versus renting.
Frequently Asked Questions
What is the 28/36 rule for home affordability?
The 28/36 rule is a lender guideline with two parts. Your total monthly housing payment, including principal, interest, taxes, insurance, and HOA fees, should stay at or below 28% of your gross monthly income. Your total monthly debt payments, housing plus car loans, student loans, and credit cards, should stay at or below 36% of gross income. Many loan programs allow higher ratios, but these thresholds are a reasonable starting point for setting a comfortable budget.
What is DTI and why does it matter for a mortgage?
DTI stands for Debt-to-Income ratio. It compares your total monthly debt payments to your gross monthly income before taxes. Lenders use it to gauge whether you can comfortably handle a new mortgage on top of existing obligations. Most conventional loans require a back-end DTI of 43% or less, though FHA loans may allow up to 50% with compensating factors such as strong cash reserves or a credit score above 720.
How much down payment do I need to buy a house?
The minimum depends on the loan type. FHA loans require 3.5% down with a credit score of 580 or higher. Some conventional loans accept as little as 3%. Putting down less than 20% on a conventional loan typically requires private mortgage insurance (PMI), which costs 0.5% to 1.5% of the loan amount per year. A larger down payment reduces your loan balance, lowers monthly payments, and may eliminate PMI, but waiting to save 20% is not always the financially optimal strategy.
Should I buy the most expensive house I qualify for?
Generally, no. Lender approval is based on a formula that does not include childcare, retirement savings, college funds, or lifestyle costs. Buying at the top of your approval range can leave you financially stretched if any unexpected expense arises. A common recommendation is to target a home price 10% to 15% below your maximum approval amount. That buffer gives you room for maintenance reserves, savings contributions, and changes in income.
How does my credit score affect how much home I can afford?
Your credit score affects the interest rate a lender offers you. A score above 740 typically qualifies for the best conventional rates. A score between 620 and 680 may still qualify for FHA approval, but at a higher rate. On a $300,000 loan over 30 years, the difference between a 6.5% rate and a 7.5% rate is roughly $190 per month, which translates to about $25,000 to $35,000 less in buying power at the same monthly payment.
Does property tax affect how much house I can afford?
Yes, significantly. Property taxes are included in your front-end DTI calculation as part of your monthly housing payment. In low-tax states, taxes on a $350,000 home might add $175 to $250 per month to your payment. In high-tax states such as New Jersey or Illinois, the same home could add $650 to $800 per month. That difference can reduce your affordable price by $80,000 or more, even if your income and loan rate are identical.
Related Guides
Step-by-step overview of the purchase process, loan types, and common pitfalls.
How to compare the full 10-year cost of owning versus renting in your market.
Central resource for the rent-vs-buy decision, with calculators and supporting guides.
Maintenance, repairs, utilities, selling costs, and other expenses beyond the mortgage.
Methodology
This guide evaluates home affordability using the standard front-end and back-end DTI framework applied by conventional and government-backed mortgage lenders in the United States. The 28% front-end and 43% back-end limits reflect guidelines used by Fannie Mae and Freddie Mac for conventional conforming loans. FHA limits of up to 50% back-end DTI with compensating factors are drawn from HUD handbook guidance.
Numeric examples use hypothetical inputs to illustrate how each variable affects the output. They are not based on any specific borrower and should not be used as a substitute for a formal mortgage pre-qualification or pre-approval. Property tax ranges referenced are based on publicly available state-level effective tax rate data. Insurance figures reference national and regional averages.
Interest rate figures used in examples are illustrative only and do not reflect current market rates. Readers should consult current rate data from primary mortgage lenders or the Consumer Financial Protection Bureau for up-to-date benchmarks.
This article is for general informational purposes only and is not financial or legal advice.
Was this guide helpful?
Share it with others planning their home purchase