What $400,000 actually costs you each month

A $400,000 house does not cost $400,000 a year. It costs you money every single month through your mortgage payment, property taxes, insurance, and maintenance. The mortgage payment alone on a $400,000 loan at today's rates runs between $2,100 and $2,500 per month depending on your down payment and interest rate. Add property taxes (which vary wildly by state and county), homeowners insurance ($1,000 to $2,000 yearly), and set aside 1% of the home's value annually for repairs and upkeep. That puts your total housing cost somewhere between $2,800 and $3,500 monthly before utilities.

The standard rule is that your housing payment should not exceed 28% of your gross monthly income. If you earn $5,000 per month gross, you should spend no more than $1,400 on housing. If your total housing cost is $3,000 monthly, you need to earn at least $10,700 per month gross (or roughly $128,000 annually) for the numbers to work without stretching yourself thin.

But that rule assumes you have no other debt. If you carry student loans, car payments, or credit card balances, your total debt payments cannot exceed 43% of your gross income. That leaves even less room for a mortgage.

Key Takeaways

  • A $400,000 house typically costs $2,800 to $3,500 monthly in mortgage, taxes, insurance, and maintenance combined.
  • Your housing payment should not exceed 28% of your gross monthly income, which means you need roughly $128,000 annual income to comfortably afford this price range.
  • Your total debt payments (mortgage plus car loans, student loans, and credit cards) cannot exceed 43% of gross income without creating financial strain.
  • Down payment size matters: a 20% down payment ($80,000) lowers your monthly payment by roughly $400 compared to a 5% down payment ($20,000).
  • Property taxes and insurance vary by location, so a $400,000 house in one state may cost $500 more monthly than the same house in another state.

How much down payment you actually need

The down payment is the chunk of money you pay upfront, and it directly shrinks your monthly payment. A 20% down payment on a $400,000 house is $80,000. A 5% down payment is $20,000. The difference in monthly payment between these two is roughly $400 per month over 30 years.

If you put down less than 20%, you will pay private mortgage insurance (PMI), which is an extra monthly fee that protects the lender if you stop paying. PMI typically costs 0.5% to 1% of your loan amount annually, split into monthly payments. On a $320,000 loan (5% down on $400,000), PMI runs $130 to $270 per month. You can remove PMI once you reach 20% equity in the home, but that takes years of payments.

Many people assume they need 20% down to buy a house. You do not. Federal Housing Administration (FHA) loans allow 3.5% down. Conventional loans allow 3% down. Veterans Affairs (VA) loans allow 0% down if you may have access to. The catch is that lower down payments mean higher monthly costs through PMI or a larger loan amount.

What your credit score and interest rate do to affordability

Your interest rate is the percentage the lender charges you to borrow money. A 1% difference in interest rate changes your monthly payment by roughly $250 on a $400,000 loan. If you have a credit score of 620, you might pay 7.5%. If your score is 760, you might pay 6.5%. That 1% difference costs you $3,000 per year.

Lenders pull your credit score, review your payment history, and check your debt-to-income ratio before offering you a rate. If you have missed payments, high credit card balances, or recent collections, you will pay a higher rate. If you have a strong score and low debt, you get the better rate.

Before house hunting, pull your credit report from AnnualCreditReport.com (the only free, federally authorized site) and dispute any errors. Pay down credit card balances to below 30% of your limits. Make all payments on time for at least six months. These steps can raise your score by 50 to 100 points, which translates directly into a lower interest rate and a lower monthly payment.

How to calculate whether you can afford it

Start with your gross monthly income. This is your salary before taxes, not your take-home pay. If you earn $60,000 annually, your gross monthly income is $5,000.

Multiply that by 0.28. This is the maximum you should spend on housing: $5,000 × 0.28 = $1,400. Now subtract any existing debt payments: car loans, student loans, credit cards, personal loans. Add your estimated mortgage payment, property taxes, insurance, and HOA fees if applicable. If the total stays under $1,400, you are within the safe zone.

If you do not know your estimated mortgage payment, use an online calculator (Bankrate, NerdWallet, and the Consumer Financial Protection Bureau all offer free ones). Enter the loan amount, your estimated interest rate, and 30 years as the term. The calculator shows your principal and interest payment. Then add your local property tax rate (search "[your county] property tax rate"), homeowners insurance quote (call three insurers for quotes), and 1% of the home price annually for maintenance.

If the total exceeds 28% of your gross income, the house is too expensive for your current situation. You have three options: earn more, save a larger down payment to lower the loan amount, or look at less expensive homes.

Why location changes the real cost

A $400,000 house in Texas costs far less monthly than a $400,000 house in New Jersey because property taxes differ dramatically. Texas has no state income tax but charges property tax at roughly 0.8% of home value annually. New Jersey charges property tax at roughly 0.9% of home value but also has state income tax. On a $400,000 home, that is a difference of roughly $400 per year in property taxes alone, plus the state income tax difference.

Insurance costs also vary by location. Homes in areas with high crime, frequent natural disasters, or older construction cost more to insure. A home in Florida costs more to insure than the same home in Ohio because of hurricane risk.

Before deciding you can afford a $400,000 house, research the specific property taxes and insurance costs in the neighborhood where you are looking. Call your county assessor's office for the property tax rate and get insurance quotes from at least three companies for the specific address.

What happens if you stretch too far

If you buy a house that takes up more than 28% of your gross income, you have less money for everything else: food, utilities, car payments, childcare, medical bills, and emergencies. One job loss, medical crisis, or major repair can push you into default. You stop paying the mortgage, the lender forecloses, and you lose the home and damage your credit for seven years.

Even if you do not default, house-poor living is miserable. You cannot save for retirement, take a vacation, or handle a $5,000 car repair without going into debt. You are one emergency away from financial collapse.

The 28% rule exists because decades of lending data show it is the threshold where people stop defaulting and start building wealth. Staying under it is not conservative—it is the difference between owning a home and losing one.

Frequently Asked Questions

What if I have student loans—does that change what I can afford?

Yes. Your total debt payments (mortgage plus all other loans) cannot exceed 43% of your gross income. If you earn $5,000 monthly and have $800 in student loan payments, you have only $1,350 left for a mortgage payment ($5,000 × 0.43 = $2,150 total debt; $2,150 − $800 = $1,350). This is why paying down student loans before buying a house often makes sense.

Can I afford a $400,000 house if I have a co-borrower?

Yes, if both incomes are stable and documented. Lenders add both gross incomes together and apply the same 28% and 43% rules. If you earn $50,000 and your spouse earns $60,000, your combined gross income is $110,000 monthly, or $9,167 monthly. You can afford a housing payment up to $2,567 monthly. However, if one person loses their job, you need to afford the payment on one income alone.

Should I get pre-approved before house hunting?

Yes. Pre-approval means a lender has reviewed your income, credit, and debt and told you the maximum loan amount they will give you. It is not a may provide, but it shows sellers you are serious and it prevents you from falling in love with a house you cannot actually afford. Pre-approval is free and takes one to three days.

What if I can only put 5% down—is the house still affordable?

Only if your total monthly cost (mortgage plus PMI plus taxes plus insurance) stays under 28% of your gross income. The lower down payment increases your monthly payment, so you may need to earn more or look at a less expensive home. Run the numbers with PMI included before deciding.

How much should I have saved before buying a $400,000 house?

At minimum, your down payment plus 2% to 5% of the home price for closing costs. On a $400,000 house with 5% down, that is $20,000 down plus $8,000 to $20,000 in closing costs. Many buyers also keep three to six months of mortgage payments in savings as an emergency fund, which is an additional $8,400 to $16,800 for this price range.