How Much House Can I Really Afford?

Start with the monthly payment, not the home price

The listing price gets most of the attention during a home search, but the monthly payment is what actually shapes your budget for the next 15 to 30 years. A mortgage payment is rarely just principal and interest. It typically includes property taxes, homeowners insurance, HOA dues, and — if you put less than 20% down — private mortgage insurance (PMI).

These additions are not small. Taxes and insurance alone can add $400 to $1,200 per month depending on the home price and location. A $350,000 home in a high-tax state can cost more per month than a $400,000 home in a low-tax state, even with the same rate and down payment.

Two homes with the same listing price can produce very different monthly costs depending on their tax rate, insurance premium, and whether an HOA is involved. This is why running the actual numbers matters — a rough rule of thumb built on price alone can be off by hundreds of dollars a month.

What the full monthly cost actually looks like

Here is a concrete example. Take a $380,000 home with 20% down ($76,000), leaving a $304,000 loan at 7% on a 30-year term. Principal and interest comes to roughly $2,023 per month — that is the number most listing searches show.

Now add the ownership costs that go on top of it. Annual property taxes of $7,600 (2% of value, a rate common across many states) add $633 per month. Homeowners insurance at $1,800 per year adds $150. Total so far: $2,806 — already $783 above the P&I figure. Throw in a $300/month HOA and the real payment is $3,106. That is more than $1,000 per month above what appeared in the listing search.

If the down payment were 10% instead of 20%, PMI would also apply — typically 0.5% to 1.5% of the loan amount per year. On a $342,000 loan at 0.8% PMI, that adds another $228 per month until the loan balance reaches 80% of the original home value.

Running these numbers before you set a price range is not optional. The mortgage calculator lets you enter all of these inputs so the monthly total reflects what you will actually owe, not just the advertised loan payment.

The 28/36 rule — and why it is a starting point, not the answer

A widely cited guideline says housing costs should stay below 28% of gross monthly income, and total debt payments should stay below 36%. These are known as the front-end and back-end debt-to-income ratios. Many conventional lenders use variations of these thresholds when evaluating applications.

On a $90,000 gross income — about $7,500 per month — the 28% front-end limit puts the target housing payment at $2,100 or less. The 36% back-end limit caps total debt (housing plus loans, minimums, and other obligations) at $2,700. If you already carry a $500 car payment and $200 in student loan minimums, you have $2,000 left for housing under the 36% ceiling — not $2,700.

These ratios are useful benchmarks, but they describe what a lender may approve, not what feels comfortable in practice. The 28% figure is calculated from gross income — before taxes, retirement contributions, health insurance premiums, or any other deduction. The dollar amount that actually hits your bank account can be 25% to 35% lower than gross pay. A housing payment that is 28% of gross may be 35% to 40% of take-home pay, which leaves considerably less room for everything else.

Use the income ratios as an upper boundary to avoid — not a target to aim for.

How income maps to a realistic home price

A rough income-to-price heuristic says you can afford approximately 3 to 4 times your gross annual income, depending on rates, down payment, and local costs. At today's interest rates, many buyers find the comfortable range is closer to 3 times income or less.

On a $100,000 gross annual income ($8,333/month), a 3x multiple suggests a $300,000 home. With 20% down ($60,000), a $240,000 loan at 7% runs $1,597/month in P&I. Add $4,500 in annual property taxes ($375/month) and $1,500 in annual insurance ($125/month), and the total payment is about $2,097 — approximately 25% of gross monthly income. That is manageable for many buyers in this income bracket.

Push to a 4x multiple — a $400,000 home — and the numbers shift materially. With 20% down and the same rate, P&I is $2,129/month. Taxes and insurance on a higher-priced home might run another $650/month, bringing the total near $2,779. That is 33% of gross income — still within lender guidelines but leaving less room for savings, retirement, and emergencies.

Neither scenario is right or wrong. What matters is running your actual income, actual debt, and actual local costs through the calculator rather than anchoring to a multiple and assuming it is safe.

Debt changes the answer significantly

Existing monthly debt obligations shrink the room available for housing. Auto loans, student loans, personal loans, and credit card minimums all count toward the back-end debt-to-income ratio that lenders evaluate — and more importantly, they directly reduce your monthly cash flow.

A buyer earning $90,000 per year with no debt has substantially more purchasing power than a buyer at the same income carrying $800/month in loan payments. The second buyer needs to subtract that $800 from whatever the housing payment could be — before any lifestyle expenses enter the picture.

This is why checking your debt-to-income ratio before shopping helps. A home price that looks fine in isolation can become uncomfortable when it sits on top of existing obligations. The debt-to-income calculator lets you see both ratios — front-end (housing only) and back-end (all debt) — so you can identify whether debt is compressing your options before you get attached to a specific price range.

• List all required monthly debt minimums before estimating what housing you can afford.
• Compare the projected total payment to take-home pay, not just gross income.
• If debt is high, consider whether payoff before buying improves the purchase math.
• Leave room for savings, maintenance, and non-debt living expenses — not just the mortgage.

The down payment decision and PMI

A larger down payment reduces the loan amount, lowers the monthly payment, and — if you reach 20% — eliminates PMI. A smaller down payment preserves cash but means a higher payment and, in many cases, an extra PMI charge that can run $100 to $300 per month until you reach 20% equity.

The tradeoff is not always obvious. Putting 20% down on a $400,000 home requires $80,000 upfront. Putting 10% down requires $40,000 — freeing $40,000 of cash that could cover an emergency fund, closing costs, and early home repairs. The monthly payment would be higher, but the post-closing financial position might be more stable.

PMI is not permanent. Under the Homeowners Protection Act, lenders are required to cancel PMI automatically once the loan balance reaches 78% of the original home value (assuming payments are current). You can also request cancellation when you reach 80% equity based on the original appraisal. Keep this timeline in mind when comparing down payment scenarios — a higher initial payment with PMI can still make sense if the cash preserved has high value to you.

Run the comparison in the mortgage calculator by changing the down payment between scenarios. The resulting monthly payment difference tells you what the cash savings cost per month — and you can decide whether that tradeoff is worth it.

Cash reserves matter after closing

A large down payment can lower the monthly mortgage, but using every dollar of liquid savings can leave a new homeowner financially exposed the moment something breaks. Home repairs, appliance replacements, HVAC failures, and plumbing issues do not wait for a convenient time. Moving costs, utility deposits, furniture, and other first-year expenses often arrive before the first mortgage payment does.

Most financial planners suggest keeping 3 to 6 months of expenses in liquid savings regardless of whether you own or rent. For homeowners, an additional 1% to 2% of the home's value in a dedicated maintenance reserve is a reasonable target — a $350,000 home suggests $3,500 to $7,000 set aside for ongoing upkeep.

A more realistic affordability assessment accounts for what remains in your accounts after the down payment and closing costs clear. If buying the home at a given price requires spending down savings to a level you would not feel comfortable at in any other situation, that is worth weighing carefully — even if the monthly payment fits within the guidelines.

What lender approval actually means

Lender approval tells you the maximum a lender is willing to offer based on their guidelines — income ratios, credit score, and debt load. It does not account for your actual spending patterns, your savings goals, your job stability concerns, or the non-debt expenses that do not show up in an application.

Many buyers discover after closing that the payment they were approved for leaves less room than expected once actual monthly life resumes. Utilities on a larger home, maintenance costs, higher property taxes than the estimate, or a rate adjustment can all push the real monthly cost above the qualifying payment.

The question to ask is not "what will a lender approve?" It is "what payment can I sustain comfortably for 30 years while still making progress on savings, retirement, and unexpected expenses?" Those are different questions with different answers.

A practical affordability checklist

Before settling on a price range, work through the following. This is not a substitute for professional advice, but it catches the most common gaps in a back-of-envelope affordability estimate.

• Run the full PITI payment (principal, interest, taxes, insurance) — not just P&I — for any home you are seriously considering.
• Add PMI if the down payment is under 20% and check when it would cancel.
• Add HOA dues if applicable — these are fixed costs that lenders count and that do not disappear.
• Calculate the payment as a percentage of take-home pay, not just gross income.
• Subtract existing debt minimums from available cash flow before assessing whether housing fits.
• Estimate what remains in liquid savings after the down payment and closing costs clear.
• Stress-test the payment at a rate 0.5% to 1% higher than the current quote.
• Budget for 1% to 2% of home value annually for maintenance and repairs.
• Confirm the payment still works if one income in a two-income household is disrupted.