Here's an uncomfortable truth about mortgages: the bank will often approve you for more house than you can comfortably afford. Approval is about whether you can technically make the payment. Affordability is about whether you can make it and still live your life. Let's run the real numbers for one household and see where the line actually falls.
Meet Jordan and Sam. Combined income: $85,000 a year. Savings: $38,000. A car payment of $350 a month, a student loan costing $200. They've fallen for a $350,000 listing. Can they afford it?
Step 1: The two ratios lenders use
Gross monthly income here is $7,083. Lenders typically apply two limits:
- Front-end ratio (28%): total housing cost — principal, interest, taxes, insurance, the whole PITI — shouldn't exceed about $1,983 a month.
- Back-end ratio (36%): housing plus all other debt payments shouldn't exceed about $2,550. Subtract the car ($350) and the student loan ($200), and housing can take at most $2,000.
The binding limit is the front-end one: roughly $1,983 a month for everything house-related.
Step 2: What the $350,000 house actually costs per month
As of the week of August 20, 2026, the average 30-year fixed rate sits at 6.65%, per Freddie Mac's national survey — and after the Fed's July decision to hold its benchmark at 3.5%–3.75% for a fifth straight meeting, nobody should count on a meaningfully lower rate this year.
With 10% down ($35,000), Jordan and Sam would borrow $315,000. At 6.65% over 30 years:
- Principal and interest: about $2,022 a month
- Property taxes (est. 1.1% of value): about $321
- Homeowners insurance: about $160
- PMI (required below 20% down, est. 0.6%): about $158
Total PITI: roughly $2,660 a month. Their budget: $1,983. They're over by almost $700 a month — every month, for years. You can rerun this with your own numbers in the financing calculator; it takes about a minute.
Step 3: So what price does fit?
Work the math backwards. With $1,983 available and taxes, insurance and PMI scaling with the price, the payment lands on budget at a purchase price of about $260,000 with 10% down: a $234,000 loan costs about $1,502 in principal and interest, plus roughly $490 in taxes, insurance and PMI.
That's the honest answer at today's rate: $85,000 of income comfortably carries about $260,000 of house with 10% down — not $350,000. If that number feels deflating, keep reading, because it's not fixed.
Step 4: The three levers that move the number
Lever 1 — kill the other debts. Remember the back-end ratio? If the $350 car payment disappears, the constraint loosens. Paying off a $4,000 car balance can unlock far more borrowing power than saving that same $4,000 for the down payment.
Lever 2 — reach 20% down. PMI adds about $158 a month for nothing you keep. At 20% down it vanishes, and the loan shrinks too.
Lever 3 — question the price, not just the payment. A $300,000 house instead of the $350,000 one changes everything. Suppose Jordan and Sam spend a year paying off the car and building the down payment to $60,000. Now: $240,000 loan, about $1,541 in principal and interest, roughly $420 in taxes and insurance, no PMI. Total: about $1,960 — under budget, with the back-end ratio wide open. If you're weighing what a fair price is for the payment you can carry, the asset value calculator inverts the problem: it tells you the price your monthly budget supports.
Step 5: The cash nobody budgets for
One more reality check before anyone celebrates. Closing costs typically run 2%–5% of the purchase price — on a $260,000 home, somewhere between $5,000 and $13,000 on top of the down payment. Now look at Jordan and Sam's $38,000 in savings: a $26,000 down payment plus, say, $8,000 in closing costs leaves about $4,000 in the bank. That's not an emergency fund; that's a furnace repair away from a credit card balance.
This is the quiet argument for the one-year plan. It isn't only about reaching 20% down — it's about arriving at closing with the house funded and three months of expenses still sitting in savings. A house you can afford monthly but that empties every account on day one is still a fragile purchase.
What about waiting for rates to drop?
Tempting, and partly reasonable — every half-point matters. At 6.15% instead of 6.65%, the $240,000 loan costs about $1,462 instead of $1,541. Real money, but notice it's $79 a month: smaller than the effect of the car payment, and much smaller than the $50,000 price difference between the two houses. Rate obsession is common; price and debt discipline move the number more. To see exactly how sensitive your payment is to the rate, try the interest rate calculator with your own scenario.
One more choice worth a look once the budget works: loan term. The gap between a 15-year and a 30-year mortgage is dramatic over a lifetime — we ran that comparison in 15-year vs. 30-year mortgage: the $280,000 difference.
The takeaway
Don't start with the listing and ask if you can stretch to it. Start with 28% of your gross monthly income, subtract the true monthly cost of taxes, insurance and PMI, and let the remainder tell you your price range. Jordan and Sam's version of that math said $260,000 today — or $300,000 after a year of deliberate preparation. Yours will say something different, which is exactly the point.
Figures use the Freddie Mac average rate and market estimates from August 2026; costs vary by state and profile, and this is education, not financial advice.