How Much House Can I Afford? What Banks Hide

If you are asking how much house can I afford, the answer is not what an online calculator told you, and it is not your maximum approval amount either. The real number is the monthly payment you can carry without wrecking your financial life, and most buyers never figure that out before they start shopping. I am going to show you the exact math lenders run on your file so you can do it yourself before you ever pick up the phone.

The online calculator told Marcus he could afford a $400,000 home. His lender approved him for $340,000. Neither number was actually right. The number that mattered was the one we built together from real data, and it came out to $330,000 once we factored in property taxes and insurance for the specific zip codes he was targeting.

You Are Probably Here Because a Calculator Left You Confused

You typed a number into an online mortgage calculator, got a result that either excited or terrified you, and now you are not sure whether to trust it. Maybe you are getting ready to talk to a lender for the first time and you do not want to walk in blind. Maybe someone told you that you need to earn a certain amount to buy in today's market and you want to know if that is actually true.

Marcus was in exactly that spot. He had been renting in Greenville, South Carolina for six years. Solid income. Decent savings. No idea what he actually qualified for. He had three different numbers from three different online tools and zero confidence in any of them.

The gap between what a calculator shows and what a lender actually approves comes down to what the calculator does not know: your property taxes, your homeowner's insurance, your HOA if there is one, and whether you are paying private mortgage insurance. Those numbers change your payment by hundreds of dollars a month. That changes the purchase price you can actually support. Stay to the end and I will give you the exact calculation to run yourself so you walk into any lender conversation knowing your real number.

How Much House You Can Afford: The Math Lenders Actually Use

Every lender in the country uses one ratio to determine how much house you can afford. It is called your debt-to-income ratio, or DTI. Here is how it works.

Take your gross monthly income. That is your income before taxes. Add up every monthly debt payment that shows on your credit report: car loans, student loans, credit card minimum payments, personal loans, any installment debt. Divide that total by your gross monthly income. That percentage is your back-end DTI.

Most conventional loans want that number at or below 45 percent. FHA loans often allow up to 50 percent with strong compensating factors. VA loans are flexible but most lenders want to stay under 41 to 45 percent.

Here is the part calculators miss. Your new mortgage payment gets added to your existing debt pile before the lender does the math. So if you earn $7,000 a month gross and you have $500 in existing monthly debt payments, and a lender allows 45 percent DTI, you have $2,650 of total room. Subtract the $500 already going out and your maximum mortgage payment, including principal, interest, taxes, insurance, and HOA if applicable, is $2,150. That is your ceiling. Your comfort zone is probably lower.

Now here is what trips people up. Calculators do not know your property taxes. In South Carolina, property taxes vary significantly by county and by whether the home is your primary residence. A $350,000 home in Charleston County carries a very different tax bill than the same price home in Horry County. Those numbers change your payment by hundreds of dollars a month, which changes how much house you can actually afford.

The second thing calculators miss is PMI. If you put less than 20 percent down on a conventional loan, you are paying private mortgage insurance. That adds anywhere from $80 to $300 a month depending on your loan size and credit score. That comes out of your payment ceiling too.

Marcus ran this math correctly for the first time when we talked. His gross income was $6,200 a month. He had a car payment of $380 and a student loan of $210. That was $590 going out before any mortgage. At 45 percent DTI, his total debt ceiling was $2,790. Subtract $590 and his maximum housing payment was $2,200. With taxes and insurance factored in for the area he was shopping, that translated to a purchase price right around $330,000. The calculator was too high. The bank approval was close but did not account for his full tax and insurance picture.

Why Working With a Broker Changes the Calculation

This matters a lot in South Carolina, Georgia, and North Carolina right now because inventory has shifted and buyers are competing in price ranges where a $20,000 mistake on affordability means you are making offers on the wrong homes entirely.

A single bank runs your file through their one set of guidelines. I work with multiple lenders, which means if one lender's approach is tighter on DTI, I have another who reads the same income differently. That is especially true for self-employed borrowers, commission earners, or anyone with rental income.

I read the actual agency guidelines from Fannie Mae, FHA, VA, and USDA, not a bank's interpretation of them. That means I know when a lender is being overly conservative and I know which one to bring your file to instead. Marcus ended up closing on a home in Columbia because we matched his actual qualifying profile to the right lender and the right loan type. He did not have to settle for less. He just needed the right calculation done right the first time.

Here Is the Napkin Math I Promised You

Pull out your phone and do this right now.

Step one: Write down your gross monthly income before taxes. Step two: Add up every monthly debt payment on your credit report. Car, student loans, credit cards at their minimum payment. Step three: Multiply your gross income by 0.45. That is your total debt ceiling at 45 percent DTI. Step four: Subtract your existing monthly debts from that ceiling. Step five: The number you have left is your maximum monthly housing payment including taxes and insurance.

Take that number and ask a lender this exact question: given this maximum payment, what purchase price does that support after factoring in current property taxes for the zip codes I am targeting and a realistic insurance estimate? If they cannot answer that with a specific number, you are not talking to the right person yet.

Run Your Real Numbers With Me

If you want me to run your actual numbers, not a calculator estimate, call me at 843-569-7283 or visit homeloansinc.com. Tell me your gross monthly income, your monthly debts, and the zip codes you are targeting. I will tell you your real number, not a range, not a maybe.

If this helped you understand how affordability actually works, hit like and subscribe. I put out answers like this every week and I read every comment.

Jason Sharon, NMLS 1281448, Home Loans Inc.