Worked Example: Building a Zero-Based Budget From Net Pay

A zero-based budget means every dollar of your take-home pay has a job — your income minus your expenses equals exactly $0. This walkthrough shows how to build one from a real paycheck using the hourly paycheck calculator.

The Scenario

Sarah works part-time and earns $14.00 per hour. She works 25 hours each week. After taxes and deductions, she takes home 80% of her gross pay. Each month she wants to give $40 to her church, save $50 for her first car, save $30 for a spring break trip, spend $45 on her phone bill, $60 on gas, $30 on clothing, and $25 on entertainment.

This is a classic personal-finance homework problem — let's solve it step-by-step.

Step 1: Calculate Weekly Gross Pay

$14.00/hour × 25 hours/week = $350.00 weekly gross

Step 2: Calculate Monthly Gross Income

For monthly calculations, use the standard conversion: weekly × 52 weeks ÷ 12 months:

$350.00 × 52 / 12 = $18,200 / 12 = $1,516.67 monthly gross

Step 3: Calculate Monthly Net (Take-Home) Income

Sarah takes home 80% of gross:

$1,516.67 × 0.80 = $1,213.33 monthly net income

You can verify these numbers in the hourly paycheck calculator by entering $14/hr, 25 hours, weekly pay frequency, and approximately 20% total deductions.

Step 4: List the Planned Expenses

Category	Monthly Amount
Church (giving)	$40.00
Savings (first car)	$50.00
Savings (spring break trip)	$30.00
Phone bill	$45.00
Gas	$60.00
Clothing	$30.00
Entertainment	$25.00
Total planned	$280.00

Step 5: Calculate Remaining Income

Net income: $1,213.33 Minus planned expenses: −$280.00 Remaining: $933.33

Sarah has $933.33 unallocated. A zero-based budget requires every dollar to have a job, so she needs to allocate this remaining amount.

Step 6: Allocate the Remaining Income

Following recommended budgeting priorities (housing → food → transportation → emergency fund → debt → retirement → fun):

Category	Monthly Amount	% of Net
Housing (rent + utilities)	$500.00	41.2%
Groceries	$200.00	16.5%
Auto insurance	$80.00	6.6%
Emergency fund savings	$100.00	8.2%
Retirement (Roth IRA)	$50.00	4.1%
Personal care	$30.00	2.5%
Buffer (unexpected)	$23.33	1.9%
Subtotal added	$983.33	—
Wait — over by $50

Let me recalculate. Total should equal $1,213.33 exactly:

Category	Monthly Amount	% of Net
Housing	$500.00	41.2%
Groceries	$200.00	16.5%
Auto insurance	$80.00	6.6%
Emergency fund	$100.00	8.2%
Roth IRA	$50.00	4.1%
Personal care	$30.00	2.5%
Buffer	$23.33	1.9%
Plus original 7 categories	$280.00	23.1%
TOTAL	$1,213.33	100%

Now the budget equals $0 leftover.

Step 7: Verify the Calculation

Sarah's monthly budget now has every dollar allocated:

Total income: $1,213.33 Total expenses + savings: $1,213.33 Leftover: $0.00 ✓

This is a zero-based budget.

Recommended Budgeting Priorities (in order)

When allocating your own zero-based budget, follow this priority order:

1. Housing (rent/mortgage) — typically 25-35% of net
2. Food (groceries, not restaurants) — 10-15% of net
3. Transportation (gas, insurance, car payment) — 10-15% of net
4. Utilities (electric, water, internet) — 5-10% of net
5. Insurance (health, life, renters) — 5-10% of net
6. Emergency fund — 5-10% of net (until 3-6 months expenses saved)
7. Retirement — 5-15% of net (401k match first, then Roth IRA)
8. Personal spending — 5-10% of net (clothing, entertainment, dining out)
9. Giving — 5-10% of net (if desired)
10. Debt payoff — varies (avalanche or snowball method)

What to Do With Leftover Money

If your budget has money left over after funding every category, you have three options:

1. Increase savings rate — boost emergency fund to 6 months, then start a house down payment fund
2. Increase retirement — max out Roth IRA ($7,000/year in 2026), then 401(k) to employer match, then max 401(k) ($23,500/year)
3. Invest in yourself — courses, certifications, or skill development that boost earning potential

Try It Yourself

Enter Sarah's numbers into the hourly paycheck calculator:

• Hourly rate: $14.00
• Regular hours: 25
• Pay frequency: Weekly
• Approximate deductions: 20% (12% federal + 5% state + 7.65% FICA = 24.65% — Sarah's "80% take-home" assumption is close)

You'll see approximately $1,213/month net, which matches our budget.

Related Calculators

• Hourly Paycheck Calculator — start here for monthly net income
• After-Tax Income Calculator — annual net by state
• Salary Converter — convert any pay period
• Payroll Deduction Calculator — detailed 401k/HSA breakdown
• Wages Calculator — hourly to annual