How Much House Can You Afford in Montgomery County on $100K, $150K, or $200K?

The question "how much house can I afford?" sounds simple. The honest answer is more complicated than any mortgage calculator will tell you — because the payment is only part of the picture.

Here's how to actually calculate what you can afford in Montgomery County's current market.

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The Rule Banks Use — and Why It's a Starting Point, Not the Answer

Mortgage lenders use two key ratios:

Front-end ratio (housing ratio): Your total housing payment (PITI — principal, interest, taxes, insurance) should not exceed 28–31% of your gross monthly income.

Back-end ratio (total debt ratio): All monthly debt payments (housing + car + student loans + minimum credit card payments) should not exceed 43% for conventional loans (sometimes higher for FHA/VA).

These are maximums, not targets. A payment at 28% of gross income may be comfortable for a household with no other debt. The same payment may be tight for a household with two car payments and student loans.

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What Different Income Levels Can Afford in Montgomery County

These calculations assume 10% down payment, 7% mortgage rate, Montgomery County property taxes (~1.3–1.4% of value), homeowners insurance (~$200/month), and no PMI (though at 10% down, PMI would add $150–$400/month for conventional loans).

$100,000 Gross Annual Income (~$8,333/month)

28% housing ratio = $2,333/month PITI maximum

Working backward at 7% rate on a 30-year loan:

• At $2,333/month: approximate loan amount ~$320,000
• With 10% down: home price ~$355,000

Reality in Montgomery County: $355,000 in 2026 gets you a condo or very small SFH in the entry-level market. Germantown, parts of Gaithersburg, and some Silver Spring condos are in this range. It's doable but requires flexibility on location and type.

First-time buyer programs (Maryland Mortgage Program) can help reduce the down payment requirement, but they don't change the monthly payment affordability math.

$150,000 Gross Annual Income (~$12,500/month)

28% housing ratio = $3,500/month PITI maximum

• At $3,500/month: approximate loan amount ~$490,000
• With 10% down: home price ~$544,000

Reality in Montgomery County: $544,000 is the heart of the county's market. Townhomes in Gaithersburg and Germantown, older SFHs in Rockville and Silver Spring, and some Wheaton and White Oak properties are in this range. Competitive but accessible.

At $150,000 household income with solid credit and manageable other debt, most buyers are looking at the $500K–$600K range realistically.

$200,000 Gross Annual Income (~$16,667/month)

28% housing ratio = $4,667/month PITI maximum

• At $4,667/month: approximate loan amount ~$660,000
• With 10% down: home price ~$733,000

Reality in Montgomery County: $733,000 opens Rockville single-family homes, Silver Spring colonials, and entry-level properties in parts of Bethesda. You're buying into solid school zones and have real options across the county.

With 20% down (no PMI), the same income can support a higher purchase price because the monthly payment is lower.

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What the Calculator Misses

Property taxes: Montgomery County property taxes run approximately 1.3–1.4% of assessed value annually. On a $600,000 home: ~$8,000/year, or ~$667/month added to your payment. Don't ignore this.

HOA fees: Condos and townhomes in HOA communities add $300–$700/month. This reduces the loan amount you can support at any given income level.

Maintenance: Homeownership costs money beyond the mortgage. Budget 1–2% of home value per year for maintenance and repairs. On a $600K home: $6,000–$12,000/year.

The actual take-home math: Gross income minus federal and state taxes, plus health insurance and retirement contributions, leaves take-home pay that varies significantly by individual situation. A household grossing $150,000 may take home $9,500–$10,500/month after taxes depending on filing status, state deductions, and benefits costs.

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The Honest Way to Know Your Number

The most reliable way to know what you can actually afford — not the maximum you qualify for, but the payment you can comfortably carry while meeting other financial goals — is:

1. List all monthly obligations: debt minimums, savings contributions, childcare, utilities
2. Know your actual take-home pay
3. Determine what's left over for housing that doesn't require eliminating savings or flexibility
4. Work backward to a purchase price from that monthly number

The pre-approval tells you the maximum. Your budget tells you the right number. Those are often different.

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Frequently Asked Questions

Can I afford a house in Montgomery County on $100K?

Yes, in the $300K–$400K range — primarily condos and smaller homes in more affordable areas like Germantown, Gaithersburg, and parts of Silver Spring. First-time buyer programs can help with down payment. The monthly payment at this income level is tight; entering with other significant debt makes it harder.

What salary do you need to buy a $600K house in Maryland?

At 7% interest rate, 10% down, and standard taxes/insurance, a $600K home carries a PITI of approximately $3,800–$4,200/month. Using the 28% rule, you'd need approximately $163,000–$180,000 in gross annual household income to comfortably qualify.

Is it worth buying vs. renting in Montgomery County?

For most buyers who plan to stay 4+ years, buying builds equity while renting doesn't. But the monthly cost of ownership typically exceeds renting at the same square footage level — you're paying a premium for ownership, appreciation potential, and stability. Read the full rent vs. buy analysis here.

How much down payment do I need in Montgomery County?

Minimum is 3–3.5% with FHA or low-down-payment conventional loans ($18,000–$21,000 on a $600K home). 10–20% is more common. Don't forget closing costs ($17K–$25K at that price) — your total cash needed is down payment plus closing costs.

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Want to Know Your Specific Number?

Generic calculators don't account for your actual debt, tax situation, HOA, or the specific properties in your price range. I work through the real math with every buyer before we start looking.

Book a free buyer consultation →