"How much house can I actually afford?" is the single most important question in home buying, and the answer is almost never the one the showroom suggests. Your salary is only the starting point: lenders approve you based on your existing debts, the cash you can put down, today's interest rate, the property taxes and insurance you will owe, and a debt-to-income ceiling they will not cross. This home affordability calculator from Smekys backs out the largest home price that fits all of those rules, then breaks the result into a clean PITI budget so you shop with a real number, not a guess.
Adjust the sliders and the max affordable price, the required loan, and the monthly PITI update instantly. Stress-test a higher rate, a bigger car payment, or a heftier down payment to see how each one moves the ceiling.
How to Use
- Enter your Gross Annual Income — your total household pay before taxes. Use the figure a lender would see on your W-2 or tax return, not your take-home pay.
- Add your Monthly Debts — car loans, student loans, minimum credit-card payments, and any other recurring obligations. These come straight out of the housing budget.
- Set the Down Payment Cash you actually have saved. A larger down payment raises the home price you can carry and usually removes the need for PMI.
- Type your expected Interest Rate (APR). If you have not locked a rate, test a range around the current national average and try +0.5% to stress your budget.
- Choose the Loan Term — 30 years is standard; a 15-year term usually lowers the rate but shrinks the price you can afford because the payment is higher.
- Set your Max Debt-to-Income (DTI) ratio. Thirty-six percent is the classic guideline; the Qualified Mortgage rule allows up to 43%, and some loan programs stretch beyond that with compensating factors.
- Expand the advanced options to add Property Tax, Home Insurance, and HOA Fee. Leaving these out flatters the number — lenders build them into the real payment through escrow.
The result card first shows your gross monthly income and the monthly housing budget the DTI rule allows, then the headline: the max affordable home price, the loan you would need, and the full PITI payment it produces.
How the Affordability Math Works
Lenders do not approve a dollar amount of house directly. They approve a share of your income for debt. The engine works backward from that share:
- Monthly budget. Gross monthly income is your annual income divided by 12. Multiply it by your DTI ratio to get the total monthly debt payment a lender will allow, then subtract your existing debts to leave the housing budget.
- The payment factor. The standard amortization factor f = r(1 + r)ⁿ / ((1 + r)ⁿ − 1), where r is the monthly rate and n is the number of monthly payments, converts a loan balance into its monthly principal-and-interest cost.
- Solving for price. Because property tax scales with the home price, the engine sets the home price P so that principal & interest plus tax plus insurance plus HOA exactly equals the housing budget. That gives the highest price whose PITI never crosses your DTI ceiling.
Worked example on a $90,000 income with $500 of monthly debt, $40,000 down, 6.8% over 30 years, 36% DTI, 1.2% tax and $1,500 insurance: gross monthly income is $7,500; 36% allows $2,700 of total debt; after the $500 car payment the housing budget is $2,200. Solving the equation gives a max home price of about $310,639, a loan near $270,639, and a monthly PITI of $2,200 — $1,764 of principal and interest, $311 of tax, and $125 of insurance. That $310,639, not a pre-approval impression, is what your budget supports.
Why PITI, Not Just the Mortgage Payment
The loan payment is only the first slice. Your true monthly housing cost — PITI — bundles:
- Principal & Interest — paying down the balance plus the lender's charge.
- Property Tax — set by your county, often 0.5%–2.5% of the home value each year, collected through escrow.
- Home Insurance — required by every lender, typically $1,000–$3,000 per year.
- HOA — dues for condos and planned communities, often $100–$500 per month, layered on top.
A payment that looks affordable on P&I alone can jump several hundred dollars once tax, insurance, and HOA land. This calculator prices all of them up front, so the home price it shows is one you can actually carry month to month.
DTI: The 36% and 43% Rules
Your debt-to-income ratio is all your monthly debt payments divided by your gross monthly income. The long-standing "28/36" guideline keeps housing near 28% and total debt near 36% of income. The federal Qualified Mortgage standard generally caps total DTI at 43% for the safest, most widely available loans. Government-backed programs and manually underwritten loans may approve higher ratios when you have strong credit or cash reserves — but a higher DTI means a tighter monthly cash flow and less buffer for surprises. Set the ratio deliberately rather than assuming the maximum.
Examples
Example 1 — A typical household. A couple earns $90,000, pays $500 a month on a car, has $40,000 saved, and expects 6.8% over 30 years with a 36% DTI. The housing budget is $2,200 and the calculator lands on a max home price near $310,639 with a $2,200 PITI. They should target homes below this ceiling and keep room for maintenance.
Example 2 — No debt and low tax. The same income, but with zero monthly debts and a 0% property-tax area, opens the housing budget to $2,700. The affordable price climbs to roughly $434,984 — showing how much existing debt and local taxes silently shrink your buying power.
Example 3 — A high earner. At $1,200,000 of income, $2,000 of monthly debt, $250,000 down, 6.5% over 30 years and a 38% DTI, the monthly budget is $36,000 and the calculator supports a home near $5.18 million. This is the ceiling before other costs such as jumbo-loan pricing and high-end insurance; the engine handles seven-figure magnitudes without breaking a sweat.
FAQ
How much house can I afford based on my salary?
Divide your gross annual income by 12 for monthly pay, multiply by your DTI ratio (commonly 36%), subtract existing monthly debts, and you get the housing budget. This calculator then converts that budget — together with your down payment, rate, term, tax, and insurance — into the max home price. On a $90,000 income with typical debts, that is often a home in the low-to-mid $300,000s.
What debt-to-income ratio do lenders use?
The classic guideline caps total debt at about 36% of gross monthly income, while the Qualified Mortgage standard generally allows up to 43%. FHA, VA, and USDA programs may accept higher ratios with compensating factors. The higher your DTI, the less breathing room you have, so do not automatically max it out.
How much down payment do I need?
There is no single number: FHA loans accept 3.5% down, conventional loans often 3%–5%, and putting 20% down removes private mortgage insurance, improves your rate, and raises the home price you can afford within the same monthly budget. A bigger down payment dollar amount directly increases the affordable price this calculator returns.
Does the calculator include taxes and insurance?
Yes. The affordable price is solved so that principal, interest, property tax, home insurance, and HOA together stay inside your DTI housing budget. That bundled monthly cost is PITI, and it is the realistic number lenders escrow and you actually pay.
How does the interest rate change what I can afford?
Because every monthly dollar of rate eats into the same fixed budget, a higher rate lowers the loan — and therefore the home price — you can support. On a typical budget, even half a percent can move the affordable price by tens of thousands of dollars. Run a range of rates to see your sensitivity before you shop.
Should I spend the maximum the calculator shows?
No. The result is the ceiling a lender's rules allow, not a comfortable spending level. Leave room for maintenance (commonly 1%–2% of the home value per year), emergencies, and life changes. Many buyers target a home well under the max so the payment never feels tight.
Disclaimer
This home affordability calculator from Smekys is provided for informational purposes only and does not constitute financial, lending, real-estate, or tax advice. Estimates are based on the inputs you enter and standard DTI and amortization formulas; actual loan offers, rates, and approval vary by lender, credit profile, location, and program. Property tax, insurance, and HOA figures are approximations. Always confirm your budget and final terms directly with a licensed mortgage professional before committing to a home.