How Much House at Your Income

The Bank Will Approve More House Than Your Life Can Afford

You earn $300,000. A lender looks at that number, subtracts your $2,877 monthly student-loan payment, applies a 43% debt-to-income ceiling, and hands you a pre-approval letter for roughly $1,000,000. The letter feels like a professional judgment about what you can afford. It is not. Pre-approval measures one thing: the probability that you default on the note. It says nothing about whether you fund retirement, keep disability coverage in force, pay your loans down on schedule, or sleep at night. A lender is fully satisfied with a physician who services a maximum-size mortgage for thirty years and retires with little else — that outcome costs the lender nothing. The full monthly cost of the house that letter describes runs near $8,700 against take-home pay of roughly $17,000, before childcare, before travel, before a single dollar of investing. This module gives you the number the letter leaves out — the carrying cost — and a physician-specific way to size a house when you also carry $250,000 of student debt.

Carrying cost

The full monthly weight of owning a house: principal and interest, property tax, homeowner's insurance, a maintenance reserve, and the utilities, furnishing, and upkeep that scale with purchase price — not the mortgage payment alone.

The listing shows a price. The lender quotes a payment. Neither is what the house charges you every month. Carrying cost adds property tax, homeowner's insurance, and a maintenance reserve to principal and interest — and each of those lines scales with the price, not with your income. The classic affordability rule — keep the housing payment under 28% of gross income — was built for a borrower with no other major debt. You are not that borrower. A physician with $250,000 of student loans at 6.8% already commits $2,877 a month before the first mortgage dollar, and the 28% rule does not know that. It also does not know that your retirement accounts, not your house, are the engine of your net worth. The physician-specific sequence runs the other way: fund the student-loan plan and the retirement accounts first, then size the house from what remains.

Why it matters: On a $650,000 house, principal and interest is $4,108, but the full carrying cost is roughly $5,516 — 34% higher. Physicians who shop on the quoted payment routinely buy a third more house than they priced. Every dollar of that gap comes out of the same take-home pay that funds your loans and your retirement.

$300,000 Income, Three Houses: the Whole Bill

An attending earning $300,000 ($25,000 per month gross) compares three houses: $450,000, $650,000, and $900,000.

Bottom line: The $900,000 house consumes $7,639 of the $12,081 that remains after loans and retirement — 63% — while the $450,000 house takes $3,819 and leaves $8,262 a month of actual life.

The Doctor-House Ratchet: the Purchase Is a Subscription

Every line item above scales with price, and so do the lines the closing table never shows. Property tax reassesses upward. A 4,000-square-foot house heats, cools, and insures like a 4,000-square-foot house forever. Rooms demand furniture sized to them; the yard demands landscaping; the neighborhood calibrates what the cars in the driveway look like. On the illustrative assumptions above, the non-mortgage costs alone run $975 a month at $450,000 and $1,950 a month at $900,000 — an $11,700-per-year difference that never amortizes, never builds equity, and never ends. You do not buy a $900,000 house once. You subscribe to it every month you own it, and the subscription renews automatically.

How to avoid it: Price the subscription before you price the house. Compute the full carrying cost — principal and interest, tax, insurance, and a 1% maintenance reserve — for any address you are serious about, and add the utilities and upkeep the seller discloses. Commit the number to your written plan first; walk the property second. If the subscription does not fit after loans and retirement, the house does not fit.

First Attending Job: Buy Now or Rent One More Year?

Check Yourself: Price the $650,000 House

Size the House After the Plan, Not Before

• A pre-approval letter measures the lender's default risk at a debt-to-income ceiling; it is not an opinion about your financial plan.
• Full monthly carrying cost — principal and interest, property tax, insurance, and a 1% maintenance reserve — runs roughly 34% above the quoted payment on this module's assumptions.
• Payment-to-gross ratio rules were built for borrowers without $250,000 of student loans; size the house after loans and retirement are funded, not before.
• Every cost of a house scales with its price, so the purchase behaves like a subscription that renews monthly for as long as you own it.
• In a new job, rent until the position survives its first year; a 9% round-trip transaction cost needs years of tenure to amortize.

Do this next: Before your next open house, compute the full monthly carrying cost of one specific listing — principal and interest at a current quoted rate, plus 1.2% tax, 0.4% insurance, and a 1% maintenance reserve — and write it next to your monthly take-home pay.