How Much House Can You Actually Afford?

When you start looking at homes, you’ll quickly run into a confusing gap: the bank says you qualify for a much bigger loan than your gut says you can handle. Both can’t be right. The bank is answering “what’s the most we can lend without too much risk?” You should be answering a very different question: “what can I pay every month and still have a life?”

Let’s find that second number.

The rule banks use (and where it bends)

A classic guideline is the 28/36 rule:

Spend no more than 28% of your gross monthly income on housing (mortgage, property tax, insurance).
Spend no more than 36% of your gross income on total debt (housing plus car loans, student loans, credit cards).

So if you earn $6,000 a month before tax, the rule suggests keeping housing under ~$1,680 and all debt under ~$2,160.

It’s a reasonable ceiling. But notice it’s based on gross (pre-tax) income, while you actually pay your mortgage out of take-home pay. That gap is exactly why people who “qualify” still end up stretched.

The costs everyone forgets

The mistake first-time buyers make is thinking the mortgage payment is the cost of the house. It’s only part of it. The real monthly cost of owning includes:

Mortgage (principal + interest)
Property taxes — can be hundreds a month, and they rise over time
Homeowners insurance — required, and climbing in many areas
PMI — extra insurance you pay if your down payment is under 20%
HOA fees — if applicable, sometimes substantial
Maintenance — a common rule is ~1% of the home’s value per year; on a $400,000 home that’s ~$333/month averaged out
Higher utilities — a house usually costs more to heat, cool, and power than an apartment

Add it up and the true monthly cost can be 30–40% more than the mortgage payment alone. Budgeting for only the mortgage is how people end up “house poor” — technically owning a home, but with no money left for anything else.

The down payment piece

How much you put down upfront changes everything downstream:

20% down lets you avoid PMI and means a smaller loan and smaller payments.
Less than 20% is allowed (many loans go much lower), but you’ll usually pay PMI until you build enough equity, and your monthly payment will be higher.

On a $400,000 home, 20% is $80,000 — a big number, which is exactly why a house down payment is its own major savings goal, and why it pays to plan for it years ahead. (Because you need this money on a fixed timeline, it shouldn’t be invested aggressively — see matching money to your timeline.)

A saner way to find your number

Instead of starting with “what will the bank give me,” work backward from your life:

Start with take-home pay, not gross. That’s the money you actually have.
Decide what monthly housing cost feels comfortable — ideally leaving room to still save and enjoy life. Many people aim for housing around 25% of take-home or less.
Work backward from that all-in monthly number (including taxes, insurance, maintenance) to the home price it supports — not the other way around.
Leave a buffer. Rates, taxes, and repairs can all surprise you upward. A payment that’s comfortable today shouldn’t be one that becomes suffocating after one bad year.

The goal isn’t the biggest house you can technically get approved for. It’s the house that lets you keep funding your emergency fund, your retirement, and the rest of your life at the same time.

The takeaway

The bank’s number is a maximum, not a recommendation. Borrowing to the limit leaves no room for the property taxes, repairs, and surprises that homeownership guarantees. Find the payment that fits comfortably inside your real, take-home budget, and you’ll enjoy the home instead of being trapped by it.

When you’re ready to save for the down payment, our free planner can turn that target into a clear monthly savings plan on whatever timeline you choose — and its built-in estimator helps you ballpark the down payment from the home price.

This article is for general education and isn’t personalized financial advice. Mortgage rules, rates, and costs vary widely. Consult a qualified mortgage or financial professional before making a home-buying decision.