Affordability Calculator · 2026
Can You Afford a $300,000 House on $100,000?
Gaithersburg, MD
⚠️ Borderline
Possibly — but tight. At 31% of take-home pay, you exceed the 28% comfort zone but stay under the 35% maximum lenders often allow.
Monthly Take-Home
$6,170
after all taxes
Monthly Housing Cost
$1,929
P&I + tax + ins.
Housing Ratio
31%
⚠ 28–35%
Remaining Monthly
$4,241
after housing
Monthly Cost Breakdown
Salary & Tax Breakdown
Affordability at Other Home Prices
50 / 30 / 20 Budget Planner
Based on your monthly take-home of $4,241 ($50,892/yr)
$2,121
per month
- ›Rent / mortgage
- ›Groceries
- ›Utilities
- ›Insurance
- ›Minimum debt payments
- ›Transportation
$1,272
per month
- ›Dining out
- ›Streaming services
- ›Gym
- ›Hobbies
- ›Travel
- ›Shopping
$848
per month
- ›Emergency fund
- ›401(k) / IRA
- ›Investments
- ›Down payment fund
- ›Debt payoff (extra)
Needs / year
$25,446
Wants / year
$15,268
Savings / year
$10,178
Frequently Asked Questions
Can you afford a $300,000 house on a $100,000 salary in Gaithersburg?
Possibly — but tight. At 31% of take-home pay, you exceed the 28% comfort zone but stay under the 35% maximum lenders often allow. Monthly housing costs (P&I + taxes + insurance) would be $1,929, vs. monthly take-home of $6,170.
What is the monthly mortgage payment on a $300,000 house?
With a 20% down payment ($60,000) and a 30-year fixed rate of 6.75%, the principal & interest payment is $1,557/month. Add property tax (~$248/mo) and homeowners insurance (~$125/mo) for a total of ~$1,929/month.
What salary do you need to afford a $300,000 house in Gaithersburg?
Using the 28% front-end ratio guideline (housing ≤ 28% of gross monthly income), you would need a gross salary of at least $82,678 to comfortably afford this home. Lenders generally allow up to 36–43% of gross income for total debt payments.
How does cost of living in Gaithersburg affect home affordability?
Gaithersburg has a cost-of-living index of 1.33 (1.00 = US average). At 33% above average, everyday expenses will further reduce the budget left after housing costs.