On a $100,000 salary, you can likely afford a home in the $350,000 to $460,000 range, depending on your down payment, interest rate, existing debts, and local property taxes. The wide spread in that estimate comes down to personal financial details that matter just as much as your income. Here’s how to figure out where you actually land.
The 28/36 Rule as a Starting Point
Lenders use two key percentages to judge what you can handle. The first is the “front-end” ratio: your monthly housing costs (mortgage payment, property taxes, insurance) should stay at or below 28% of your gross monthly income. On $100,000 a year, that’s about $8,333 per month gross, putting your housing budget ceiling at roughly $2,333.
The second is the “back-end” ratio, also called your debt-to-income ratio (DTI). This adds all your monthly debt payments together, including the mortgage, car loans, student loans, credit cards, and any other obligations. Fannie Mae, which sets the rules for most conventional mortgages, caps DTI at 36% for manually underwritten loans, though borrowers with strong credit and cash reserves can qualify up to 45%. Loans run through Fannie Mae’s automated underwriting system can be approved with a DTI as high as 50%.
At $100,000 gross income, a 36% back-end limit means your total monthly debt payments can’t exceed $3,000. If you’re already paying $500 a month toward a car loan and $300 toward student loans, only $2,200 is left for housing, not $2,333. That difference alone can shrink your buying power by $20,000 or more.
What Your Down Payment Changes
The size of your down payment directly affects how much home you can buy on the same monthly budget. A larger down payment means you’re borrowing less, so more of each monthly dollar goes toward a higher purchase price rather than interest. Using the 28% rule ($2,333 monthly housing payment) and a 30-year fixed mortgage at 6.5% interest, the math looks like this:
- 10% down: You could afford a home around $410,000.
- 20% down: You could afford a home around $461,000.
Shorter loan terms compress the numbers significantly. A 15-year mortgage at 5.75% with 10% down brings you closer to $312,000, and even 20% down only gets you to about $351,000. The monthly payments are higher because you’re paying off the loan in half the time, which limits the purchase price you can reach within the 28% guideline.
If you qualify for an FHA loan, which allows down payments as low as 3.5%, your upfront cash requirement drops. But you’ll be borrowing more, and FHA loans require mortgage insurance for the life of the loan in most cases, which eats into your monthly budget. Expect a purchase price somewhat below the 10%-down figure.
How Interest Rates Shift Your Budget
As of late April 2026, the national average for a 30-year fixed mortgage sits at 6.23%. Even small rate changes have a real impact on affordability. On a $350,000 loan, the difference between 6% and 7% is roughly $230 more per month, or about $83,000 in total interest over 30 years.
You can’t control where rates are when you buy, but you can influence the rate you’re offered. A credit score above 740 typically gets you the best pricing. Paying discount points at closing (prepaid interest, usually 1% of the loan amount per point) can buy down your rate by about 0.25%. That trade-off makes more sense if you plan to stay in the home for at least five to seven years.
Costs That Don’t Show Up in the Loan Amount
Your mortgage payment is only part of your monthly housing cost, and lenders count the full picture when qualifying you. Property taxes, homeowners insurance, and potentially private mortgage insurance (PMI) all get added to your payment before the lender checks whether you fit within the 28% guideline.
Property tax rates vary widely by location. In areas with high property taxes, you might pay $5,000 to $8,000 a year on a $400,000 home. In lower-tax areas, it could be $2,000 to $3,000. Homeowners insurance runs roughly $2,500 a year for a policy covering $400,000 in dwelling coverage, though your actual cost depends on the home’s location, age, and construction.
If you put less than 20% down on a conventional loan, you’ll pay PMI until you reach 20% equity. PMI typically costs between 0.5% and 1.5% of the loan amount per year. On a $370,000 loan, that’s $154 to $463 a month. This is money that goes toward insurance for the lender, not toward your equity, and it directly reduces the mortgage amount you can qualify for.
How Existing Debt Shrinks Your Buying Power
Your other monthly obligations are the single biggest variable in this calculation, and the one most online mortgage calculators underestimate. Every $100 you pay monthly toward non-housing debt reduces your mortgage capacity by roughly $15,000 to $18,000.
Here’s a practical example. With zero existing debt, you might qualify for a $400,000 home. Add a $400 car payment and $200 in minimum credit card payments, and your qualifying price drops to roughly $310,000 to $330,000, even though your income hasn’t changed. Lenders don’t care that you’ll pay off the car in two years; they count the payment as long as it appears on your credit report with more than about 10 months remaining.
If you’re carrying significant debt, paying down or eliminating one or two obligations before applying can be more effective than saving for a larger down payment. A $400 car payment eliminated frees up roughly $60,000 to $70,000 in additional borrowing capacity.
A Realistic Budget at $100,000
Qualifying for a mortgage and comfortably affording one are different things. The 28% rule tells you what a lender will approve, but it doesn’t account for your retirement savings, childcare, groceries, or the cost of maintaining a home. Many financial planners suggest keeping total housing costs closer to 25% of gross income if you want breathing room.
On $100,000 before taxes, your take-home pay is probably somewhere around $6,200 to $6,800 per month, depending on your tax situation, retirement contributions, and benefits deductions. A $2,333 housing payment would consume 34% to 38% of that net income. For some households that’s manageable. For others, especially those with children, variable income, or aggressive savings goals, targeting a payment closer to $1,800 to $2,000 provides a more comfortable margin.
That lower target would put your purchase price in the $300,000 to $380,000 range on a 30-year loan, depending on your down payment and rate. It’s less exciting than the maximum a lender might approve, but it leaves room for home repairs, rate increases if you have an adjustable-rate mortgage, and the general reality that homeownership costs more than the mortgage payment alone.