How Much House Can I Afford?

The Right Way to Ask the Question

“How much house can I afford?” has two different answers depending on who is answering. A lender answers with the maximum loan amount they will approve based on your income, credit score, and existing debts. Financial planners answer with a number that lets you own the home comfortably while still meeting other life goals.

These two numbers frequently diverge — and the gap can be tens or hundreds of thousands of dollars. A lender might approve you for a $650,000 mortgage. A financial planner looking at your retirement savings, childcare costs, and income stability might say $450,000 is your real ceiling. Buying to the maximum of lender approval is a path many homeowners regret.

Being “house poor” is the name for the situation where homeownership costs consume so much of your income that you cannot afford to save adequately, take vacations, handle unexpected expenses, or maintain the home properly. It is surprisingly common because the pressure to buy the best house you can qualify for is intense — from real estate agents, from social comparison, and from the fear of being priced out of a rising market.

This guide focuses on helping you find the number you can genuinely afford — not the maximum you can borrow.

The 28/36 Rule Explained

The 28/36 rule is a traditional guideline used by mortgage lenders and financial advisors for decades. It defines two limits:

• The 28% front-end ratio: Your total housing costs — including the mortgage principal and interest, property taxes, and homeowner's insurance (collectively called PITI) — should not exceed 28% of your gross monthly income.
• The 36% back-end ratio: Your total monthly debt payments — including housing costs plus all other debt (car loans, student loans, credit card minimums, personal loans) — should not exceed 36% of your gross monthly income.

A practical example: if your household gross income is $8,000 per month, the 28% limit puts your maximum housing payment at $2,240. The 36% limit means all debt payments combined (housing + other debt) should not exceed $2,880. If you already have $500 per month in car loan and student loan payments, your housing budget under the back-end rule is $2,380.

The 28/36 rule produces a more conservative affordability estimate than what most lenders will actually approve in 2024. Modern underwriting often allows front-end ratios up to 31-33% and back-end ratios up to 43-50% for conventional loans. This is not an invitation to use the full amount lenders allow — it is simply the lending limit, not a financial health guideline.

For a sustainable homeownership experience, the 28/36 rule remains a sensible personal target even if your lender will approve more.

Debt-to-Income Ratio: What Lenders Actually Use

Debt-to-income ratio (DTI) is the primary metric lenders use to evaluate mortgage applications. It measures your monthly debt obligations as a percentage of your gross monthly income.

The calculation is straightforward: add up all your recurring monthly debt payments (the proposed mortgage payment plus all existing debts), then divide by your gross monthly income.

For example: proposed mortgage payment of $2,200 + car payment of $350 + student loan of $200 = $2,750 total monthly debt. With a gross monthly income of $7,500: $2,750 ÷ $7,500 = 36.7% DTI.

DTI thresholds by loan type in 2024:

• Conventional loans: Typically allow a maximum back-end DTI of 45-50% for well-qualified borrowers, though 43% or below is preferred.
• FHA loans: Allow back-end DTIs up to 57% in some cases, making them accessible for buyers with higher debt loads but requiring mortgage insurance premiums.
• VA loans (veterans): No hard DTI limit but a residual income requirement that often functions similarly to a 41% DTI guideline.
• Jumbo loans: Typically stricter, with many lenders requiring DTI under 43%.

A lower DTI improves your chances of approval, secures better interest rates, and most importantly gives your household more financial flexibility after buying. Reducing existing debt before applying for a mortgage is one of the most effective ways to either qualify for a larger loan or improve the terms of the loan you receive.

How Down Payment Changes What You Can Afford

The down payment has an outsized impact on home affordability in multiple directions simultaneously: it reduces your loan amount, eliminates or reduces mortgage insurance costs, affects your interest rate, and determines whether certain loan programs are available to you.

Less than 20%: Private Mortgage Insurance (PMI)

If you put down less than 20% on a conventional loan, you will pay private mortgage insurance (PMI) — typically 0.5% to 1.5% of the loan amount annually, added to your monthly payment. On a $400,000 loan at 1% PMI, that is $333 per month in PMI alone. PMI cancels automatically once your equity reaches 20% of the original appraised value.

PMI does not mean you should wait to buy — in many markets, home price appreciation has historically outpaced the cost of PMI. But it does mean the true cost of a smaller down payment is higher than the mortgage statement suggests.

Minimum down payments by loan type

• Conventional loans: As low as 3% for first-time buyers (Fannie Mae HomeReady or Freddie Mac Home Possible programs), though 5-20% is more common.
• FHA loans: 3.5% minimum for credit scores 580+; 10% minimum for scores 500-579. FHA mortgage insurance premiums are generally more expensive than conventional PMI.
• VA loans: 0% down for eligible veterans and active military, with no PMI requirement.
• USDA loans: 0% down for eligible rural and suburban properties with income limits.

The opportunity cost of a large down payment

Putting 20% down to avoid PMI requires having that cash available. On a $450,000 home, that is $90,000 — money that could alternatively be invested in the market. In markets with strong home appreciation, the equity from a larger down payment may underperform what an invested equivalent would earn. The right down payment size depends on your local market, investment options, and how long you plan to stay in the home. Use the down payment calculator to map out how different down payment amounts affect your loan and payment.

The Hidden Costs of Homeownership

One of the most dangerous errors first-time buyers make is budgeting only for the mortgage payment. A home comes with an array of ongoing costs that can add 30-50% to the actual monthly cost of ownership beyond the mortgage itself.

Property taxes

Property taxes are typically collected monthly as part of an escrow account attached to your mortgage. Effective property tax rates vary enormously by location — from under 0.3% of assessed value in Hawaii to over 2% in New Jersey, Illinois, and Texas. On a $400,000 home in a 1.5% tax rate area, that is $6,000 per year or $500 per month, every month, for as long as you own the property.

Homeowner's insurance

Homeowner's insurance is required by lenders. The national average is roughly $1,000-1,500 per year for a typical home, though coastal properties, homes in areas prone to wildfires, and large or high-value homes pay significantly more. Also budget for any additional required coverage: flood insurance (required in flood zones) and earthquake insurance (common in California) can add hundreds to thousands of dollars annually.

Maintenance and repairs

A widely cited guideline is to budget 1% of the home's value annually for maintenance and repairs. On a $400,000 home, that is $4,000 per year — $333 per month. The reality is lumpy: some years you spend almost nothing, and then the roof needs replacing ($10,000-15,000), the HVAC fails ($5,000-10,000), or the water heater gives out ($1,000-2,000). Without a maintenance reserve, a single major repair can require debt financing at a bad time.

HOA fees

Condos, townhomes, and many planned communities carry homeowner association fees ranging from $100 to $1,000+ per month. These fees cover shared amenity maintenance, exterior upkeep, and often building insurance for common areas. They are non-optional and often increase annually.

Closing costs

One-time costs to close on a home typically run 2-5% of the purchase price, including lender origination fees, title insurance, appraisal, home inspection, attorney fees (in some states), and prepaid interest. On a $400,000 home, that is $8,000-20,000 in upfront costs beyond the down payment. Factor this into your total cash-needed calculation, not just the down payment amount.

Income-Based Affordability Guidelines

Several simple income-to-home-price guidelines exist as quick sanity checks. None is precise, but they give useful starting ranges.

The 2.5x to 3x gross income rule

A traditional guideline says home purchase price should be no more than 2.5 to 3 times your gross annual household income. At a $120,000 household income, this suggests a home price of $300,000 to $360,000. In many high cost-of-living markets, this rule is simply not achievable — homes cost 5-10x local incomes. But it remains a useful guardrail in markets where it applies.

Monthly payment as a percentage of take-home pay

A practical approach based on net income rather than gross: your total housing costs (mortgage, taxes, insurance, PMI if applicable) should not exceed 25-30% of your monthly take-home pay. This is more conservative than the 28% of gross that lenders use, but it reflects that you actually live on take-home pay, not gross income.

If your household takes home $6,500 per month net, a 25% housing limit puts your total housing payment at $1,625. That is the number to work backward from to determine how much house that payment supports at current rates.

Use the mortgage calculator to find the loan amount that produces a monthly payment within your target range, then add your projected taxes and insurance to verify the total housing cost.

Rent vs. buying your current housing cost

If you are currently renting, compare your current rent to the estimated total monthly ownership cost (mortgage + taxes + insurance + maintenance reserve) for the home you are considering. If ownership costs are dramatically higher — more than 20-25% above your current rent — be honest about whether the delta fits your budget and financial goals. The rent vs. buy calculator can help you model the full financial comparison over your expected time horizon.

Signs You Are Buying Too Much House

The following are warning signs that the home you are considering may be stretching your finances beyond a comfortable range, even if a lender will approve the loan:

• Your total housing payment exceeds 30% of your net monthly income.
• Buying requires raiding retirement accounts or taking on high-interest debt for the down payment.
• You would have less than three months of expenses in savings after closing costs and the down payment.
• The monthly payment works only if both income streams in a two-income household remain continuous — with no margin for job loss or reduced hours.
• You could not afford the home at an interest rate 1-2% higher (relevant if taking an adjustable-rate mortgage).
• You are counting on appreciation to justify the price — buying a home that does not work financially without price increases is speculation, not a purchase.
• You have not run the full cost including taxes, insurance, maintenance reserve, and any HOA fees — only the mortgage payment.

None of these signals means you should not buy — homeownership creates equity, stability, and significant personal and financial value. They are signals to buy with eyes open, at a price that preserves your financial health and flexibility. Use the savings goal calculator to plan for your down payment target and ensure you reach it without depleting reserves you will need after closing.