Online calculators will happily tell you that you can “afford” a $900,000 house on your salary. What they do not mention is the property tax bill, the insurance, the maintenance, the HOA, and the fact that being house-poor in an expensive market is a special kind of misery. Affordability is not the maximum loan a bank will give you. It is the price that lets you sleep at night.
This guide shows how to calculate how much house you can actually afford, with real New York numbers. You will learn the 28/36 rule, the all-in monthly cost most buyers forget, and how to stress-test any price before you commit.
The 28/36 Rule: The Classic Starting Point
Lenders have used the 28/36 rule for decades. Spend no more than 28 percent of gross monthly income on total housing costs, and no more than 36 percent on all debt payments combined, including housing. Earning $150,000 a year means $12,500 a month gross; 28 percent allows $3,500 for housing, and 36 percent caps total debt at $4,500.
These are maximums, not targets, and in high-cost markets they are aggressive maximums. A New York household spending the full 28 percent on housing has little margin for the city’s other costs: childcare, transit, taxes. Many financial planners suggest treating 25 percent as the real ceiling here. The Consumer Financial Protection Bureau’s home-buying resources walk through these ratios with interactive worksheets.
The All-In Monthly Cost Buyers Forget
The mortgage payment is just the headline. The real monthly cost adds property taxes, homeowners insurance, and, for many New York buyers, HOA or co-op maintenance fees. A $600,000 home with 20 percent down at 6.5 percent carries a principal-and-interest payment around $3,035. Add New York property taxes, easily $600 to $1,200 a month depending on location, insurance at $150 to $300, and co-op maintenance that can exceed $1,500, and the true monthly cost can be $5,000 to $6,000. That is nearly double the mortgage payment.
Then budget 1 to 2 percent of the home’s value annually for maintenance and repairs: $6,000 to $12,000 a year on that $600,000 home, or $500 to $1,000 a month. New buyers consistently underestimate this; the roof, the boiler, and the plumbing do not care about your budget spreadsheet. Add it in from day one or the first big repair becomes debt. HUD’s homebuyer guides emphasize this total-cost view for exactly this reason.
Working Backwards From Take-Home Pay
Gross-income rules mislead because so much disappears before you see it. Work backwards from take-home pay instead. Start with monthly take-home, subtract all non-housing essentials and your savings targets, and what remains is your true housing budget. If take-home is $9,000, essentials and savings take $5,000, then $4,000 is the honest ceiling for all-in housing, not the $3,500 that a gross-income rule suggested before taxes.
This method automatically accounts for your real life: student loans, childcare, the retirement savings you refuse to sacrifice. A buyer who protects a 15 percent savings rate and then buys what remains is never house-poor. A buyer who stretches to the bank’s maximum and then tries to save what is left is always stressed. The order of subtraction is the entire philosophy. Keep the discipline with budgeting your money to save more after the purchase.
Stress-Test the Price Before You Commit
Run three scenarios on any price you are considering. Scenario one: one income drops 20 percent, through job loss, a career break, or reduced hours. Can you still cover the all-in cost without raiding retirement? Scenario two: interest rates rise two points before you buy or when your adjustable rate resets. Scenario three: a $15,000 surprise repair in year two. If the price survives all three, it is genuinely affordable. If it fails any, you are buying stress, not a home.
Also price the down payment honestly. Twenty percent down avoids private mortgage insurance, but in New York that means $100,000 to $200,000 in cash plus closing costs of 2 to 5 percent. Draining every dollar of savings for the down payment leaves you cash-poor in the most expensive phase of ownership. Keep three to six months of expenses liquid after closing, even if it means a smaller down payment and temporary PMI. Build that reserve with saving for a big purchase discipline well before you shop.
New York Specifics That Change the Math
Co-ops dominate much of the city’s market and come with board approval, strict down payment minimums (often 20 to 25 percent), and monthly maintenance that bundles taxes and building costs. That maintenance is part of your housing cost and it rises; underwrite it at 3 to 5 percent annual growth, not today’s number.
Property taxes vary wildly by location: New York City’s effective rates are relatively low but assessments are high, while many suburbs combine high rates with high prices. Model the specific property’s taxes, not the county average. And remember the mansion tax and transfer taxes on higher-priced purchases; on a $1 million-plus buy, closing costs jump meaningfully. NerdWallet’s affordability calculator lets you model these local inputs directly.
The Rent-vs-Buy Sanity Check
Before committing to any purchase price, run the rent-versus-buy comparison for your specific situation. The classic 5% rule: multiply the home’s price by 5% and divide by 12. If the result exceeds the monthly rent for a comparable place, renting is likely cheaper; if it is lower, buying likely wins. A $600,000 home gives $2,500 a month; if comparable rentals cost $2,200, renting wins on pure math.
The 5% captures the unrecoverable costs of ownership: property taxes, maintenance, and the opportunity cost of the down payment, roughly 1% each, plus mortgage interest. It is a simplification, but a useful one that prevents the emotional error of assuming buying always builds wealth. In expensive coastal markets, renting often wins for years; the buy decision should rest on stability, control, and long-term plans, not on the myth that rent is “throwing money away.” Buy when the math is close and the life reasons are strong, not when the math screams rent.
The Bottom Line
You can afford the house whose all-in monthly cost, mortgage, taxes, insurance, maintenance, and fees, fits comfortably in your take-home pay after essentials and savings, survives a 20 percent income drop, and leaves your emergency fund intact. For most New York buyers that means spending well below the bank’s maximum, keeping housing near 25 percent of gross, and budgeting 1 to 2 percent of value yearly for maintenance. The right house is the one you can afford on your worst month, not your best.
Frequently Asked Questions
What is the 28/36 rule for mortgages?
Spend no more than 28 percent of gross monthly income on total housing costs and no more than 36 percent on all debt payments. They are maximums; many planners suggest 25 percent as the real ceiling in expensive markets.
How much house can I afford on $150,000 salary?
The 28 percent rule suggests up to $3,500 a month in total housing costs, supporting roughly a $500,000 to $600,000 purchase with 20 percent down at current rates, but only if taxes, insurance, and maintenance fit inside that number.
Should I drain savings for a 20 percent down payment?
No. Keep three to six months of expenses liquid after closing even if it means a smaller down payment with temporary PMI. Cash-poor new owners turn every repair into debt.
Do co-op maintenance fees count in affordability?
Absolutely. Maintenance bundles taxes and building costs and can exceed $1,500 a month in Manhattan. Underwrite it as part of housing cost with 3 to 5 percent annual growth.