How much mortgage can I afford is the first question almost every first-time buyer asks, and it has three answers: what your income supports, what your savings allow, and what payment you actually want to live with. The lowest of the three is your real budget.
By Julia LuisMortgage Loan Officer · Mortgage-World.comLenders start with your gross monthly income, allow roughly 43% to 50% of it for all debt combined, and subtract your existing car, card, and student loan payments. What is left has to cover principal, interest, taxes, insurance, and any HOA fee. Then your cash on hand sets a second ceiling — and you should set a third one below both.
Three different ceilings
How Much Mortgage Can I Afford? There Are Three Answers
Ask how much mortgage can I afford and you are really asking three questions at once. Every buyer runs into three separate ceilings, and the lowest one is the real one. The first is what the guidelines allow your income to carry. The second is how much cash you have for the down payment, closing costs, and what is left over afterwards. The third is the payment you actually want to make every month for the next thirty years.
Lenders answer the first two. Nobody but you answers the third, and it is the one that determines whether the house feels like an achievement or a treadmill. It is completely normal — and often smart — to be approved for $600,000 and buy at $480,000.
The ratio
What Lenders Allow: The Debt Ratio Behind How Much Mortgage You Can Afford
The guideline you have probably read is 28/36: housing under 28% of gross income, total debt under 36%. It is a good personal budgeting target and it is not what underwriting uses. Automated underwriting routinely approves total debt-to-income ratios in the mid-forties, and FHA files with strong compensating factors — reserves, a long job history, low payment shock — can go higher.
The math is simple enough to do at a kitchen table. Take your gross monthly income, multiply by the ratio, and subtract the minimum payments on everything else you owe.
| Gross monthly income | At 43% total DTI | Less $600 in car and cards |
|---|---|---|
| $6,000 | $2,580 | $1,980 for housing |
| $8,000 | $3,440 | $2,840 for housing |
| $10,000 | $4,300 | $3,700 for housing |
Notice what the third column does. Six hundred dollars of car and credit card payments removes about $90,000 of buying power. For most first-time buyers, paying off or paying down a car note is a bigger lever on how much house you can afford than another year of saving. More on how the ratio is built in our explainer on the income test.
What the payment includes
From Monthly Payment to Purchase Price
Lenders qualify you on the full PITIA payment, not on principal and interest alone.
Your housing number above has to cover principal, interest, property taxes, homeowners insurance, mortgage insurance, and any HOA or condo fee. Only the first slice buys the house. In a New Jersey town with high taxes, the tax and insurance portion can easily be a third of the payment, which means the same $3,000 budget buys a very different house in two towns twenty minutes apart.
Two identical houses at the same price can carry payments $700 apart. The difference is the tax bill, and it never goes away.
As a rough conversion, every $1,000 of monthly principal and interest supports somewhere around $150,000 to $170,000 of loan at the rates of the last few years. So a buyer with $1,980 available for housing, spending $600 of it on taxes and insurance, has about $1,380 of principal and interest — call it $210,000 to $235,000 of loan, plus the down payment. Rates move that band, which is why you should treat it as a starting sketch and get a real quote before you shop. Freddie Mac publishes the weekly average rate if you want to track where things stand.
The cash test
Your Savings Set a Second Ceiling on How Much Mortgage You Can Afford
Income answers how much mortgage can I afford in theory. Cash answers it in practice. Income tells you what payment you can carry. Cash tells you what you can actually close. Work backwards from what you have: subtract the closing costs you expect, subtract a reserve you refuse to spend, and whatever is left is the down payment. Divide by the program minimum — 3.5% for FHA, 3% for conventional — and you have your price ceiling from the cash side.
If that number is lower than the income number, the cash side is your real constraint, and the fix is a seller credit toward closing costs rather than a bigger loan. If the income number is lower, the fix is usually retiring a monthly payment. Knowing which one is binding tells you exactly where to spend the next three months.
Choosing your own number
The Payment You Should Actually Pick
Ask yourself what you pay in rent today. If the new payment is more than about 25% higher, that is payment shock, and underwriters watch it because history says borrowers feel it. Then add the costs renting hides: repairs, a higher utility bill on a bigger space, and the reality that nobody is coming to fix the water heater but you. A reasonable planning figure is 1% of the home’s value per year in maintenance.
Our practical advice to first-time buyers is to pick a payment first, then let the price fall out of it, and to keep three to six months of that payment in the bank after closing. A house you can comfortably carry through a slow month at work is worth more than a slightly nicer house you cannot.
- Three ceilings — debt ratio, cash, and comfort — and the lowest one is your budget.
- Underwriting allows roughly 43%–50% total debt-to-income, well above the old 28/36 guideline.
- $600 of car and card payments costs about $90,000 of buying power.
- You are qualified on the full PITIA payment — in a high-tax town, taxes can be a third of it.
- Roughly, each $1,000 of principal and interest supports $150,000–$170,000 of loan at recent rates.
- Watch payment shock: more than about 25% above your current rent deserves a second look.
Common questions
How Much Mortgage Can I Afford? Common Questions
How much mortgage can I afford on a $100,000 salary?
At $8,333 a month gross and a 43% ratio, roughly $3,580 covers all debt. Subtract your car, cards and student loans, and what remains is your full housing payment including taxes and insurance. In a low-tax area that can support a price in the high $400,000s; in a high-tax town it may be $100,000 less.
Should I borrow the maximum I am approved for?
Rarely. A pre-approval is a ceiling built from guidelines, not a recommendation built from your life. Most buyers we work with choose a payment 10% to 20% below the maximum and are glad they did.
Does my student loan payment count if it is in deferment?
Usually yes. Most programs use either the actual payment on your credit report or a calculated percentage of the balance when no payment is showing, so a deferred loan still affects the ratio. Bring the statement to your first call.
Do lenders use gross or net income?
Gross — income before taxes and deductions. That is why the approved payment can look larger than what feels comfortable against your take-home pay.
How do bonus, overtime or commission income count?
Generally you need a two-year history and the income is averaged, with a declining trend used at the lower figure. Self-employed and 1099 borrowers are underwritten differently, and there are programs that qualify on deposits rather than tax returns.
Will paying off my car really help that much?
Often, yes. Eliminating a $500 payment frees roughly $500 of monthly housing capacity, which is worth far more buying power than the same amount added to your down payment. Do not do it without checking the cash side first.
How long is a pre-approval good for?
Typically 60 to 120 days, because credit reports and income documents go stale. Refreshing it is quick, and it should be refreshed anytime your income, debts, or the rate environment change meaningfully.
Keep reading
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Written and reviewed by Julia Luis, Mortgage Loan Officer of Mortgage-World.com, NMLS #1630225. About the author
Mortgage-World.com LLC is a licensed mortgage brokerage serving New Jersey, Connecticut and Florida. NMLS #1630225 (verify on NMLS Consumer Access) · Florida license MLB 1987 · Family owned since 2017.
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Last reviewed August 2026. This article is general information for educational purposes, not a loan approval, a rate quote, or a commitment to lend. Program guidelines, rates and limits change, and every file is underwritten on its own facts. Mortgage-World.com is not an agency of the state or federal government and is not affiliated with the Federal Housing Administration. Equal Housing Lender.
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