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//// Financial · Budgeting

50/30/20 Budget Builder

The classic budgeting framework made interactive. Enter your income, fill in your expenses, and see exactly where you stand — with real-time feedback on every bucket.

401(k) Limit 2024$23,000
Roth IRA Limit$7,000
S&P 500 Avg Return~10%/yr
$

Needs

50% target
Actual: $1,750Target: $1,75050.0%
$
$
$
$
$
$

Wants

30% target
Actual: $500Target: $1,05014.3%
$
$
$
$
$

Savings

20% target
Actual: $300Target: $7008.6%
$
$
$
Needs — 50% target
$1,750
Target: $1,750
Exactly on target
Wants — 30% target
$500
Target: $1,050
$550 under
Savings — 20% target
$300
Target: $700
$400 under
Monthly Surplus
$950
Great — you have money left to allocate toward savings or investments.
1

Monthly after-tax income

income = take-home pay entered into the calculator

$3,500

= $3,500

Every target bucket is measured as a share of after-tax income, not gross pay. Source: 50/30/20 budgeting framework popularized in All Your Worth by Elizabeth Warren and Amelia Warren Tyagi.

50/30/20 budgeting rule

2

50% Needs target

income × 0.50

$3,500 × 0.50

= $1,750

Needs cover essential obligations such as housing, utilities, groceries, insurance, and minimum debt payments. Source: 50/30/20 budgeting rule.

50/30/20 budgeting rule

3

30% Wants target

income × 0.30

$3,500 × 0.30

= $1,050

Wants are flexible lifestyle expenses such as dining out, entertainment, shopping, and subscription upgrades. Source: 50/30/20 budgeting rule.

50/30/20 budgeting rule

4

20% Savings target

income × 0.20

$3,500 × 0.20

= $700

Savings includes emergency-fund building, retirement investing, and other future-oriented allocations. Source: 50/30/20 budgeting rule.

50/30/20 budgeting rule

5

Actual needs spend

rent + utilities + groceries + insurance + debt minimums + other needs

$1,750 = actual needs total

= $1,750

Under target by $0 — 50.0% of income.

Needs bucket sum

6

Actual wants spend

dining out + entertainment + subscriptions + shopping + other wants

$500 = actual wants total

= $500

Under target by $550 — 14.3% of income.

Wants bucket sum

7

Actual savings

emergency fund + retirement + other savings

$300 = actual savings total

= $300

Below target by $400 (8.6% vs 20% target).

Savings bucket sum

8

Total allocated spending

needs + wants + savings

$1,750 + $500 + $300

= $2,550

This is the total amount of take-home pay already assigned across the three core buckets.

Budget allocation identity

9

Monthly surplus / deficit

income − total allocated spending

$3,500 − $2,550

= $950

$950 remains unallocated — consider boosting savings or investing.

Cash flow identity

10

Emergency fund benchmark

needs spend × 6 months

$1,750 × 6

= $10,500

The tool flags emergency savings as a priority because your current emergency-fund contribution is below the six-month needs benchmark.

Common personal finance benchmark: 3–6 months of essential expenses

Key insight

The 50/30/20 rule is a starting point, not a law. High cost-of-living areas often require a 60/20/20 or 65/15/20 split. The key is to make savings non-negotiable and automate it first.

#ShowYourWork

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