What income do I need to buy a house?

There is no single salary that "buys a house." A teacher with no debt and 20% saved can comfortably carry a mortgage that would be denied to someone earning twice as much but drowning in car and student-loan payments. Income matters enormously — but it works through a formula, and once you see the formula you can estimate your own number in a couple of minutes.

The short version: lenders take your gross monthly income, apply two percentage caps known as the 28/36 rule, and then check what monthly payment fits inside those caps after accounting for the mortgage rate, property tax, insurance and any mortgage insurance. Reverse-engineer that and you get the income a given house price requires.

The 28/36 rule: the heart of the answer

Almost every affordability estimate starts with the 28/36 rule, a long-standing lender guideline made of two ratios:

• The 28% front-end ratio. Your total housing payment — principal, interest, property tax, homeowners insurance and any HOA fee — should stay under 28% of your gross monthly income.
• The 36% back-end ratio. All your monthly debt payments combined — that housing payment plus car loans, student loans and minimum credit-card payments — should stay under 36% of gross income.

Gross means before tax. So someone earning $90,000 a year has $7,500 a month of gross income: the 28% cap is about $2,100 for housing, and the 36% cap is about $2,700 for all debts combined. The tighter of the two limits is the one that actually binds your budget — which is why existing debt can quietly shrink the house you qualify for.

"PITI" — what your payment really includes

When people picture a mortgage payment they usually think of principal and interest. Lenders think in PITI: Principal, Interest, Taxes, Insurance. On top of that sits PMI if your down payment is under 20%, and an HOA fee if the property has one. All of it counts toward the 28% front-end ratio, so taxes and insurance directly raise the income you need.

Income needed ≈ (your target PITI ÷ 28%) — adjusted up if other debts push you against the 36% cap.

The five things that move your number

Beyond the raw salary, five inputs decide how much house your income supports. Change any one and the required income shifts.

1. Your other monthly debts

A $500 car payment plus $300 in student loans eats $800 of your 36% room before the mortgage even starts. That can knock tens of thousands off your price ceiling. Paying down or eliminating those debts before you apply is often the single fastest way to qualify for more — see our guide on a good debt-to-income ratio to buy a house.

2. Your down payment

A bigger down payment shrinks the loan, lowers the monthly payment, and once you cross 20% removes PMI entirely. All three reduce the income you need. The flip side: a 3% down loan keeps more cash in your pocket but raises the monthly payment (and adds PMI), so it demands more income.

3. The mortgage rate

Rate is the cruel multiplier. The jump from 5% to 7% on a $300,000 loan adds roughly $400 a month — which can mean needing $15,000–$20,000 more annual income for the exact same house. This is why "how much can I afford" changes month to month.

4. Property tax and insurance

These vary wildly by location. A $350,000 home might carry $250/month in taxes in a low-tax state and over $700/month in a high-tax one — a difference big enough to change which house your income can reach. Homeowners insurance, and flood or wind coverage in some regions, stack on top.

5. PMI (if you put down less than 20%)

Private mortgage insurance protects the lender, not you, and typically runs about 0.3% to 1.5% of the loan per year until you reach ~20% equity. On a $300,000 loan that is roughly $75–$375 a month of pure cost that counts against your front-end ratio.

Rough income needed at several home prices

The table below shows a ballpark gross annual income to comfortably buy at three price points, using the same simplifying assumptions across the board: 10% down, a 30-year fixed at a sample 7% rate, roughly 1.1% annual property tax, standard homeowners insurance, PMI included, and little to no other debt (so the 28% front-end cap is what binds). Real numbers will differ — treat this as a starting point, not a quote.

*Illustrative PITI at a sample 7% 30-year fixed rate with ~1.1% property tax, homeowners insurance and PMI; rounded. Income figures back-solve the 28% front-end cap and assume minimal other debt. Your actual rate, taxes, insurance and debts will change these numbers — run your own.

Read the table as direction, not gospel. Lower the rate to 6% or put 20% down and the income needed drops; add a $450 car payment and the back-end 36% ratio may push it back up. A common rule of thumb is that you can afford a house worth roughly 3 to 4 times your gross income — but that shorthand quietly assumes a normal rate and modest debt, which is exactly what changes from buyer to buyer.

How income and DTI actually interact

It helps to flip the question around. Lenders don't really ask "what house fits this income?" — they ask "what monthly debt load fits this income, and how much of it is left for a mortgage?" That leftover room, divided by the per-dollar cost of a loan at today's rate, is your price ceiling.

Picture two buyers each earning $90,000 ($7,500/month gross). Buyer A is debt-free; Buyer B has $700/month in car and student-loan payments.

**Same 7% rate, 10% down and tax/insurance assumptions as above; rounded for illustration. The only difference is existing debt — yet it moves the affordable price by roughly $100,000.

That gap is the whole lesson: identical paychecks, very different homes, purely because of debt-to-income ratio. Our companion guide how much house can I afford walks through the full budgeting view, and the mortgage calculator shows how rate and term change the monthly payment.

It varies by rate, debts and location — so check yours

Every figure on this page bends to three forces: the rate on the day you lock, the debts you carry in, and the location that sets your taxes and insurance. A buyer in a low-tax state with no car payment locking at 6% needs far less income than a buyer in a high-tax county with a car loan at 7.5% — even for the identical house price. Use the income table as a sanity check, then run your own inputs before you fall in love with a listing.

One practical tip: get a real pre-approval early. It converts all of this estimation into a hard number a lender will actually stand behind, and it tells sellers you are serious. The 28/36 math gets you in the right ballpark; the pre-approval confirms the seat.

Frequently asked questions