How Much House Can I Afford on $100k Salary?

Here's the uncomfortable truth most first-time homebuyers learn too late: the bank's maximum isn't a target, it's a ceiling you should stay well below. On a $100k salary, lenders will often approve you for a $400,000-$450,000 home. The amount you should actually spend is usually closer to $300,000-$350,000 — and this article will show you why.

The 28/36 rule in plain English

The classic affordability guideline, codified by Fannie Mae and followed by most conventional lenders, is called the 28/36 rule:

• 28% (front-end ratio): Your monthly housing payment — principal, interest, taxes, insurance, and HOA if any — shouldn't exceed 28% of your gross monthly income.

• 36% (back-end ratio): Your total monthly debt payments — housing plus car loans, credit cards, student loans, personal loans — shouldn't exceed 36% of your gross monthly income.

On $100k gross ($8,333/month), that's a housing cap of $2,333 and a total-debt cap of $3,000. If you have no other debt, you can use all $3,000 for housing under the back-end test. If you have a $500 car payment and $100 minimum credit card payment, you're capped at $2,400 for housing.

What $2,400/month actually buys

Let's translate that into a home price. Assume:

• 20% down payment
• 30-year fixed rate at 7%
• Property tax ~1.2% of home value (national average)
• Homeowners insurance ~$1,200/year

With those assumptions, $2,400/month total PITI works out to a home price around $315,000. Run your own numbers with the

mortgage calculator

using your actual rate and tax estimate.

Why the bank will offer you more

Many lenders will push the front-end ratio to 35-40% for strong borrowers (FHA goes to 43% or higher). On your $100k income, that could mean approval for a $450,000 house with $2,900+ monthly payments.

The bank is underwriting their risk, not your lifestyle. They want to know you probably won't default — not whether you can still eat out, save for retirement, or handle a surprise $10k expense. The formula ignores:

• Retirement contributions (401k, IRA)
• Childcare ($1,200-$2,500/month per child in many metros)
• Health insurance if you're self-employed
• The jump in utilities from a 900 sq ft apartment to a 2,200 sq ft house
• Maintenance (rule of thumb: 1% of home value per year)
• Furniture and setup costs (a new house easily eats $10-20k)

Closing costs: the hidden 2-5%

On top of your down payment, expect 2-5% of the loan amount in closing costs: lender fees, title insurance, appraisal, inspection, prepaid taxes and insurance, and more. On a $350,000 house with 20% down ($70,000), closing costs will run $7,000-$17,500. That money is due at signing, not absorbable into the mortgage.

A better rule: the 25% rule

Many personal-finance writers recommend a stricter cap: housing should be no more than 25% of your net (take-home) income, not 28% of gross. This accounts for taxes, retirement savings, and other pre-tax deductions that the lender's formula ignores.

On $100k gross, after federal tax, state tax, FICA, and a 10% 401k contribution, take-home might be ~$5,500/month. 25% of that is $1,375/month — which is actually about what $220,000 of house buys at 7%. Yes, that's much less than the bank will approve. It's also why people who follow the 25% rule build wealth and people who max out their approval often don't.

Run three scenarios, not one

Before you fall in love with a number, model three cases:

1. The bank's max: see the stress.

2. 28% of gross: the traditional guideline.

3. 25% of net: the sustainable number.

Compare each against your actual monthly budget — not what you "could" do if you cut back on dining out. Use what your life actually looks like today, plus a buffer for surprises.

A side-by-side scenario: $100k income, two different choices

Here's what the numbers look like for a buyer earning $100k in a mid-cost city who has a $400/month car payment and $200/month in student loan minimums:

Scenario	Home Price	Monthly PITI	% of Gross	Left Over
Bank maximum (43% DTI)	$415,000	$2,900	35%	$2,833
28% front-end rule	$320,000	$2,333	28%	$3,400
25% of net (take-home)	$225,000	$1,650	20%	$4,083

The "left over" column is after PITI, car payment, and student loans. Notice that the bank-max scenario leaves only $2,833 for food, utilities, childcare, retirement, emergencies, and everything else. One broken furnace or a month without overtime pay turns "manageable" into a missed payment fast.

How your credit score changes the math

The interest rate you qualify for has a dramatic effect on affordability. On a $300,000 30-year mortgage:

• Credit score 760+, rate 6.5%: Monthly payment ~$1,896. Total interest paid: ~$182,000.

• Credit score 700, rate 7.2%: Monthly payment ~$2,030. Total interest paid: ~$231,000.

• Credit score 640, rate 8.5%: Monthly payment ~$2,307. Total interest paid: ~$330,000.

That's a $411/month difference and $148,000 in additional interest over the life of the loan between a strong and weak credit score — on the same house. If your score is below 700, spending 6-12 months paying down balances, disputing errors, and avoiding new inquiries before applying can save more money than negotiating the house price by $20,000.

The maintenance budget most buyers forget

A useful benchmark: budget 1-2% of your home's value per year for maintenance and repairs. On a $300,000 house, that's $3,000-$6,000 annually — or $250-$500 per month set aside. Older homes (20+ years), homes in harsh climates, and homes with large lots or pools run higher. This money needs to exist in your budget before the furnace dies, not improvised after.

New-construction homes have lower near-term maintenance but often come at a 10-20% price premium and in locations with higher HOA fees. Factor both into your mortgage payment estimate before comparing a new build to a resale.

When to walk away from a "dream home"

Emotional attachment is the enemy of sound affordability decisions. Some signals that a house is wrong for your finances right now, even if you love it:

• The only way it works is by stretching to the bank's maximum approval.

• You'd have less than 3 months of expenses left after closing costs and down payment.

• You're counting on an income increase that isn't yet confirmed.

• Monthly payment plus existing debt obligations would exceed 40% of gross income.

Housing markets cycle. A house you can't comfortably afford at current rates is more likely to become affordable through income growth and patience than through hoping rates drop.

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