The Budget Builder
The simplest way to manage your cash flow. Enter your monthly take-home pay to generate your ideal spending plan.
Needs
Target: 50%
On Track
Housing, utilities, groceries, insurance, and minimum debt payments. These are survival costs.
Wants
Target: 30%
On Track
Dining out, travel, hobbies, subscriptions, and shopping. The "fun" money.
Savings
Target: 20%
Under Goal
Retirement investing, debt payments above minimums, and emergency fund contributions.
Remaining Monthly Cashflow
Great job! You have extra cash flow to invest or enjoy.
(sends these numbers to Ask; we don't keep them)
Clinical Context & Calculation Details
How to Use This Calculator
Enter your monthly take-home (after-tax) pay in the hero section. Then, input your actual monthly spending for Needs, Wants, and Savings.
The tool automatically compares your actual spending against the 50/30/20 guideline and calculates your remaining monthly cash flow.
Why Doctors Need This
Physicians often experience a "lifestyle explosion" when transitioning from residency to attending. Without a budget, it's easy for a $300,000 salary to disappear into high housing costs, luxury cars, and expensive travel.
The 50/30/20 rule is a simple, effective framework to ensure you are living within your means while aggressively building wealth and enjoying your income.
The Math Behind It
Needs (50%): Essential survival costs like housing, utilities, groceries, and minimum debt payments.
Wants (30%): Discretionary spending like dining out, travel, hobbies, and entertainment.
Savings (20%): Retirement contributions, emergency fund building, and extra debt principal payments.
Pearls & Pitfalls
- Pearl: Pay yourself first. Automate your 20% savings target so it leaves your account before you have a chance to spend it on "Wants."
- Pitfall: Categorizing wants as needs. A reliable car is a need; a $1,200/mo luxury SUV lease is a want. Be honest with your classifications.
- Pearl: If your "Needs" are significantly below 50% (common for high-income specialists), move the extra percentage directly into "Savings" rather than increasing "Wants."
Worked Example
The calculator's default input: $5,000 of monthly take-home pay, about what a resident brings home.
| Step | Calculation | Result |
|---|---|---|
| Needs (50%) | $5,000 × 50% | $2,500 |
| Wants (30%) | $5,000 × 30% | $1,500 |
| Savings and debt payoff (20%) | $5,000 × 20% | $1,000 |
A new attending. With $18,000 a month of take-home pay and $7,500 of needs, $6,000 of wants and $3,000 of savings entered, the targets are $9,000, $5,400 and $3,600. Wants are $600 over target, savings are $600 short, and $1,500 is left unassigned.
Assumptions & Sources
- Take-home pay means pay after taxes and paycheck deductions. 401(k) or 403(b) deferrals taken from your paycheck are not in that number, so they are savings on top of the 20%.
- Fixed 50/30/20 split. The percentages are a rule of thumb, not a requirement; high earners can usually save well above 20%.
- Amounts are monthly and are not adjusted for irregular income, bonuses or annual expenses.
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About the Author
Joshua Dunigan, DO | Family Medicine Resident & Founder
I'm a family medicine resident physician in Des Moines, Iowa (class of 2027). I founded MedMoneyGuide to give physicians specialty-specific financial guidance, with sources you can check.