The 4 Numbers That Determine If You Can Buy a Home
Updated: Sep 26
Most First-Time Buyers Never Calculate These: Essential Numbers for Homeownership
Most people start house hunting the wrong way. They browse listings, attend open houses, and chat with realtors. But here’s the kicker: they don’t actually know the numbers a lender will use to approve them. And those numbers? They determine everything:
Whether you qualify
How much house you can afford
What your monthly payment will be
Before you dive into the world of home buying, there are four financial numbers every future homeowner should know.

Calculating your monthly income helps set a realistic homebuying budget.
1. Your Monthly Income
Lenders kick things off with your gross monthly income — that’s the amount you earn before taxes and deductions. Why? Because your income sets the stage for the maximum mortgage payment you can comfortably handle.
Most lenders will peek at your last two years of income history to ensure your earnings are stable and consistent. This can include:
Salary or hourly income
Self-employment income
Consistent side income
Certain bonus or commission structures
But hang on! Income alone doesn’t determine what you can afford. The next number is just as crucial.
2. Your Debt-to-Income Ratio (DTI)
Your debt-to-income ratio is like a financial report card. It shows lenders how much of your income is already tied up in debt. This includes:
Credit cards
Car loans
Student loans
Personal loans
Minimum debt payments
Many lenders follow the 28/36 guideline. This means:
No more than 28% of your income should go toward housing
No more than 36% of your income should go toward total debt
Let’s break it down with an example. If your monthly income is $5,000:
Your housing costs should hover around $1,400 or less
Your total debts should stay around $1,800 or less
Understanding this number alone can completely change how you approach homebuying.

Knowing your credit score helps you understand your mortgage options.
3. Your Credit Score
Your credit score is like your financial reputation. It tells lenders how reliably you’ve handled credit in the past. Your credit score influences:
Whether you qualify for a mortgage
Your interest rate
Your monthly mortgage payment
Many buyers think they need perfect credit to buy a home. Spoiler alert: that’s a myth! Many loan programs start around 620 credit scores, and some programs may allow even lower, depending on the loan type.
But here’s the golden nugget: improving your credit score — even just a smidge — can save you thousands of dollars over the life of your loan.
4. Your Savings
Buying a home isn’t just about the down payment. Nope! Most buyers also need cash for:
Closing costs
Inspections
Moving expenses
Initial repairs
Emergency reserves
Down payments can range from 3% to 20% depending on the loan program. Closing costs typically add another 2%–5% of the purchase price. Many lenders prefer buyers to have several months of mortgage payments saved after closing. This is one of the most overlooked parts of preparing to buy a home.

The Mistake Most Future Homeowners Make
Most people know one or two of these numbers. But very few know all four. They might know their income. They might know their credit score. But they usually haven’t calculated:
Their real homebuying budget
Their true debt-to-income ratio
Their affordability range
Their down payment strategy
Without these numbers, the homebuying process can feel like a wild goose chase. Many folks delay buying simply because they don’t have a clear financial plan.
A Simple Way to Organize Your Numbers
That’s exactly why we created the Mortgage & Budget Planner. This handy workbook helps you organize the numbers lenders look at so you can clearly understand your path to homeownership.
Inside the planner, you’ll calculate:
Your true homebuying budget
Your debt-to-income ratio
Your mortgage affordability range
Your down payment strategy
Your monthly financial plan
Instead of guessing where you stand, you’ll be able to see the full picture.
Start Planning Your Path to Homeownership
If buying a home is one of your goals, the first step isn’t looking at listings. Nope! The first step is understanding your numbers.
The Mortgage & Budget Planner was designed to help future homeowners organize their finances and prepare for the mortgage process with clarity.
So, what are you waiting for? Get started on your journey to homeownership today: www.bbtdc.org/keys-to-cashflow-suite



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