How Much House Can I Afford? A Practical Budget Guide
By Maurice L. Naylon IV, CPA
The house you can afford is the one whose full cost fits your monthly budget while leaving enough cash for the purchase and for life afterward. Start with take-home pay, subtract your other spending and savings goals, and work backward to a mortgage payment. Then check closing cash and reserves before translating that payment into a price range.
A lender’s approval is useful information, but it answers a different question. The lender evaluates whether the loan meets its underwriting requirements. Your household also has to handle groceries, childcare, retirement saving, maintenance, travel, and the occasional expensive surprise. Those commitments do not all appear in a lending ratio.
Our work as a CPA, real estate investor, developer, and asset manager brings together the financing and operating sides of a property decision. A home budget needs both. The monthly loan payment matters, and so does the cash needed when a major component wears out.
For the full sequence of preparing finances, comparing loans, and planning a purchase, start with the first-time home buyer finances guide. Here, the focus is the calculation that sets your shopping range. For people looking for a completed model, download a free copy of the home affordability calculator.
Step 1: Find a Sustainable Monthly Housing Budget
Use recurring take-home income that you can reasonably rely on. Review recent bank statements and pay records, then identify irregular income separately. A bonus that varies each year should not quietly become a monthly obligation you must receive to keep the home affordable.
List non-housing spending, debt payments, and savings contributions. If retirement or insurance contributions already reduce the take-home figure, do not subtract them again. Remove current rent when building the future housing budget, but retain costs that will continue. Estimate utilities for the prospective home in one place only.
The remaining amount is the total housing allowance, including costs beyond the mortgage. The CFPB’s home-spending guide also emphasizes looking at savings, ongoing expenses, and the full housing payment when deciding what to spend. Use your own figures rather than a salary multiple.
Hypothetical monthly household budget | Amount |
Recurring take-home income | $7,000 |
Non-housing living expenses excluding utilities | ($2,400) |
Other debt payments | ($600) |
Additional savings goals not deducted from pay | ($700) |
Uncommitted monthly cushion | ($300) |
Available for all housing costs | $3,000 |
The $300 cushion is separate from the savings allocation and from the emergency fund. It provides room for ordinary variation. These amounts describe a teaching example, not recommended spending ratios. A household with childcare, medical costs, or unstable income may reach a very different housing allowance on the same salary.
Step 2: Separate the Mortgage from the Cost of Owning
Principal and interest are only part of the monthly commitment. Add property taxes, homeowners insurance, any mortgage insurance, association dues, utilities, and an allowance for maintenance and replacement. Some costs are paid through escrow; others are paid directly. The budget needs both, without counting an escrowed bill twice.
Use actual property information where possible. Ask for insurance quotes, review association charges, and confirm the expected property-tax treatment with local sources. The seller’s historical payment may not match yours. A larger home can also change utility costs and the time or money required for upkeep.
Maintenance savings are a planning allocation, not a promise that repairs will occur evenly. An older roof can require a large payment soon after closing even if you have been setting aside a modest monthly amount. Identify known immediate work separately in the purchase cash budget.
Housing allowance allocation | Monthly amount |
Total housing allowance | $3,000 |
Property taxes | ($300) |
Homeowners insurance | ($150) |
Mortgage insurance | ($100) |
Association dues | ($100) |
Maintenance and replacement savings | ($250) |
Utilities | ($250) |
Remaining for mortgage principal and interest | $1,850 |
In this example, treating $3,000 as the mortgage payment would overstate the available principal-and-interest budget by $1,150 each month. A calculator that shows only loan payments cannot settle the affordability question.
Step 3: Convert that Payment into a Loan and Price
For a fully amortizing fixed-rate loan with monthly payments, the loan amount supported by a principal-and-interest budget is:
Loan amount = monthly payment × [1 − (1 + monthly interest rate)^(−number of payments)] ÷ monthly interest rate.
Use the annual note rate divided by 12 as the monthly rate, and years multiplied by 12 as the payment count. Use the interest rate, not APR, for this payment calculation. In Excel, the corresponding formula for this example is =PV(6.5%/12,30*12,-1850).
Assume a 30-year loan at 6.50% and a $1,850 monthly principal-and-interest limit. Those inputs support approximately $292,690 of borrowing. With a down payment equal to 10% of the price, divide the loan by 90% to obtain an indicative price of approximately $325,210. The associated down payment is approximately $32,520.
These are hypothetical inputs, not a current rate quote, approval, or precise shopping limit. Taxes, insurance, mortgage insurance, and fees can change with the property, price, and loan. Recalculate all of them when evaluating an actual address. The price estimate is a starting point for that iteration.
Step 4: Check the Cash Needed before and at Closing
A workable monthly payment does not prove you have enough cash to purchase. Allocate savings among the down payment, closing charges and prepaids, moving, immediate repairs, and money you intend to keep. Deposits and amounts already paid need to be reconciled so they are not counted twice.
Use the lender’s Loan Estimate explainer to understand estimated cash to close and the payment components. The form accounts for deposits, credits, and other adjustments. Your personal cash plan must also include expenses outside the transaction, such as moving and planned repairs.
Hypothetical purchase cash plan | Amount |
Available savings before purchase spending | $70,000 |
Down payment rounded from the price calculation | ($32,520) |
Closing costs and prepaids assumed for this example | ($10,000) |
Moving and immediate work | ($5,000) |
Cash remaining afterward | $22,480 |
Household’s selected minimum reserve | $20,000 |
Amount above that selected reserve | $2,480 |
The $10,000 allowance is an assumption, not a universal closing-cost estimate. This illustration assumes no prior deposit or other purchase spending has already been deducted from the $70,000 balance. If a deposit has been paid, reconcile the opening cash and remaining cash to close rather than subtracting it twice.
This household clears its own reserve target by $2,480. That leaves limited room for the estimate to change. An additional $4,000 of closing costs or immediate repairs would push the remaining cash below the selected target, even though the mortgage payment still fits.
Step 5: Size Reserves around Your Household
A reserve target should reflect income stability, required expenses, dependents, insurance deductibles, and the home’s condition. The CFPB’s down-payment planning guidance describes setting aside an emergency cushion before deciding how much cash can go into the transaction. Avoid assigning the same money to the down payment and to that cushion.
In the example, required spending excluding additional savings and the discretionary cushion is approximately $5,750 a month: $2,400 of living expenses, $600 of debt payments, and $2,750 of housing costs excluding the maintenance savings allocation. A $20,000 reserve covers about 3.5 months of that defined spending. It may need to cover repairs too, so it is not automatically sufficient.
Keep the distinction between future monthly saving and cash already available. Planning to save $250 a month for maintenance does not fund a $6,000 repair during the first week of ownership. Inspection findings and realistic replacement timing should inform the initial reserve.
Step 6: Cross-check Lender Qualification
Debt-to-income ratio generally compares monthly debt payments with gross monthly income. The CFPB explains DTI and notes that limits vary across products and lenders. Use the lender’s definition of qualifying income and required obligations; your take-home budget serves a separate purpose.
Suppose the example household earns $10,000 gross each month. Principal and interest of $1,850, taxes of $300, homeowners insurance of $150, mortgage insurance of $100, and association dues of $100 total $2,500. Add $600 of other debt payments for a simplified total DTI of 31%.
This is an illustrative cross-check, not an underwriting determination. Lenders may treat particular obligations or income differently. Utilities and maintenance remain real expenses even though they are outside this simplified DTI calculation. A favorable ratio does not override the household budget or reserve test.
Step 7: Test Rates and Changing Costs
Before committing to a price range, test a higher borrowing rate and changes to ownership costs. The table below holds the $1,850 principal-and-interest allowance, 30-year term, and 10% down-payment assumption constant. It isolates the effect of the note rate; all other costs must be recalculated for an actual property.
Hypothetical note rate | Supported loan | Indicative price |
5.50% | $325,830 | $362,030 |
6.50% | $292,690 | $325,210 |
7.50% | $264,580 | $293,980 |
Now suppose insurance increases by $100 a month and association dues by $75. If the total housing allowance stays at $3,000, the principal-and-interest budget falls to $1,675. At the same hypothetical 6.50% rate, that supports roughly $265,000 of borrowing and a $294,450 price at 10% down.
Also test a temporary income interruption, reduced work hours, or a known future expense. Write down how long reserves would last and which spending could actually change. A hoped-for refinance should not be required to make the initial payment affordable.
What if the Numbers Do Not Fit?
First identify the binding constraint. If monthly spending is the problem, compare a lower price, different property costs, or a different loan structure using complete quotes. If closing cash is the problem, examine timing and the purchase budget. If reserves are the problem, committing more savings to the down payment may make matters worse.
A larger down payment can reduce borrowing, but it also consumes liquid cash. Recalculate both sides. Compare complete loan offers rather than choosing only the lowest advertised payment. The result may support buying a less expensive property, waiting, or continuing to rent while strengthening the cash position.
Eligible military households should include their financing options in the same affordability process. The veteran real estate guidediscusses how benefits and occupancy plans fit the broader decision. Favorable financing does not remove utilities, upkeep, or the need for cash after closing.
If the proposed home includes rental units or may later become a rental, evaluate the household budget and the rental operation separately. The guide to buying an investment property explains the additional acquisition analysis. Do not assume projected rent is automatically available or accepted as qualifying income; verify the facts and lender treatment.
A checklist before setting your search range
· Use dependable take-home pay and avoid double-counting payroll deductions.
· Include all ownership costs, with property-specific taxes and insurance where available.
· Convert only the principal-and-interest allowance into a loan amount.
· Reconcile deposits, credits, closing cash, moving, and immediate work.
· Keep a separately defined post-closing reserve.
· Check lender qualification and compare consistent loan offers.
· Test higher costs and less favorable income before choosing a price ceiling.
Get a second look at the affordability calculation
If a budget or mortgage estimate leaves you unsure, the guide to when to hire a real estate consultant can help define a focused question. Our real estate consulting services can help connect the household budget, property costs, and assumptions behind the price range.
Book a 30-minute consultation for $75 to review your affordability worksheet, available loan information, or a specific home-buying question. Model or document review can occur during the call, followed by an email with salient points or models discussed. Mortgage approval and extensive analytical work require the appropriate lender or a separately scoped engagement.
For a broader foundation, The Investor’s Guide to Real Estate connects property decisions with finance and ownership. If your question requires a larger analytical engagement, our services provides additional context.
Frequently Asked Questions
How much house can I afford on my salary?
Salary alone is insufficient. Start with recurring take-home income, subtract other spending and savings goals, then include all housing costs. Check the resulting price against available closing cash, reserves, and lender qualification.
Should I buy up to my preapproval amount?
Only if the complete payment, ownership costs, purchase cash, and reserves fit your own plan. Preapproval does not incorporate every household priority or guarantee final loan approval.
Does the 28/36 rule determine affordability?
Treat common income-ratio rules as broad screening conventions, not universal lending requirements or a household budget. Lender criteria differ, and gross-income ratios can miss significant living costs.
Do I need a 20% down payment?
Not necessarily. Available down payments and financing costs depend on the loan and borrower. Compare the actual offers, including any mortgage insurance or program fees, and preserve adequate cash after closing.
Should an affordability calculator include maintenance?
Your household calculation should include maintenance and replacement planning, even if a mortgage calculator omits them. Known immediate repairs also need a separate upfront funding plan.
Can a consultation replace mortgage preapproval?
No. A consultation can help you examine the budget and assumptions. A lender must evaluate eligibility, documentation, property requirements, and the loan itself. Schedule a focused budget review if you want help preparing those questions.
Disclaimer
This article is provided for general educational and informational purposes only. It does not constitute tax, accounting, legal, investment, lending, appraisal, or other professional advice and should not be relied upon as a substitute for advice tailored to your circumstances. Real estate investments involve risk, and financing, tax, legal, valuation, and operating consequences vary based on each investor, property, transaction, lender, jurisdiction, and applicable law. Illustrative calculations and model structures are simplified and do not establish market terms, value, expected returns, or financing eligibility. Before making an investment or implementing a tax, accounting, legal, financing, or valuation strategy, consult qualified professionals who can evaluate your specific situation. A 30-minute consultation does not establish a formal CPA, tax-preparation, legal, investment-advisory, lending, appraisal, or attestation engagement.
Comments