Personal Finance Mastery

完整的个人财务系统——预算、债务偿还、投资、税务优化、净资产跟踪和财务独立规划。在管理资金、积累财富、偿还债务、规划退休或优化税收时使用。零依赖。

## 概述（中文）

完整的个人财务系统——预算、债务偿还、投资、税务优化、净资产跟踪和财务独立规划。在管理资金、积累财富、偿还债务、规划退休或优化税收时使用。零依赖。

## 原文

# Personal Finance Mastery

Complete personal finance system covering budgeting, debt elimination, investing, tax optimization, insurance, estate planning, and financial independence. Works for any income level, any country.

---

## Quick Financial Health Check

Run `/finance-check` to score current financial health:

| Signal | Healthy | Warning | Critical |
|--------|---------|---------|----------|
| Emergency fund | 3-6 months expenses | 1-3 months | < 1 month |
| Savings rate | > 20% | 10-20% | < 10% |
| Debt-to-income | < 36% | 36-50% | > 50% |
| Housing cost | < 28% of gross | 28-35% | > 35% |
| Net worth trend | Growing quarterly | Flat | Declining |
| Insurance coverage | All critical covered | Gaps exist | Major gaps |
| Investment allocation | Age-appropriate | Slightly off | Way off |
| Tax optimization | Using all vehicles | Some unused | None used |

Score: /16. Below 10 = immediate action needed.

---

## Phase 1: Financial Snapshot

### Net Worth Statement

```yaml
net_worth:
  date: "YYYY-MM-DD"
  assets:
    liquid:
      checking: 0
      savings: 0
      money_market: 0
    investments:
      retirement_401k: 0
      retirement_ira: 0
      brokerage: 0
      hsa: 0
      crypto: 0
    property:
      home_value: 0
      vehicles: 0
      other: 0
  liabilities:
    mortgage: 0
    student_loans: 0
    auto_loans: 0
    credit_cards: 0
    personal_loans: 0
    other_debt: 0
  net_worth: 0  # assets - liabilities
  monthly_income_gross: 0
  monthly_income_net: 0
  monthly_expenses: 0
  savings_rate: 0  # (income_net - expenses) / income_net
  debt_to_income: 0  # total_debt_payments / gross_income
```

### Income Inventory

Document ALL income sources:

| Source | Type | Monthly Amount | Stability | Growth Potential |
|--------|------|---------------|-----------|-----------------|
| Primary job | W-2/salary | | High | Moderate |
| Side business | 1099/self-emp | | Variable | High |
| Investments | Dividends/interest | | Moderate | Moderate |
| Rental income | Passive | | Moderate | Moderate |
| Other | | | | |

### Monthly Cash Flow Map

```
INCOME (net take-home)
├── Fixed Expenses (needs) — target: ≤50%
│   ├── Housing (rent/mortgage + insurance + tax)
│   ├── Utilities (electric, water, gas, internet, phone)
│   ├── Transportation (car payment, insurance, fuel, transit)
│   ├── Insurance (health, life, disability)
│   ├── Minimum debt payments
│   └── Groceries (baseline)
├── Financial Goals (savings/investing) — target: ≥20%
│   ├── Emergency fund
│   ├── Retirement contributions
│   ├── Investment contributions
│   ├── Debt extra payments
│   └── Specific savings goals
└── Lifestyle (wants) — target: ≤30%
    ├── Dining out
    ├── Entertainment/subscriptions
    ├── Shopping/clothing
    ├── Travel
    ├── Hobbies
    └── Personal care
```

This is the **50/30/20 framework** — adjust ratios to your situation but track against these benchmarks.

---

## Phase 2: Emergency Fund

### Priority #1 — Before Investing

| Stage | Target | Timeline | Where to Keep |
|-------|--------|----------|---------------|
| Starter | $1,000 (or 1 month) | 1-3 months | High-yield savings |
| Basic | 3 months expenses | 3-6 months | High-yield savings |
| Full | 6 months expenses | 6-12 months | HYSA + money market |
| Enhanced | 12 months expenses | Optional | HYSA + I-bonds + money market |

### When to Use Emergency Fund

**YES — True emergencies:**
- Job loss
- Medical emergency
- Essential home/car repair
- Urgent family situation

**NO — Not emergencies:**
- Vacations
- Sales/deals
- Predictable expenses (insurance premiums, taxes)
- Lifestyle upgrades

### Replenishment Rules

- After any withdrawal, replenish becomes priority #1
- Redirect all non-essential spending until restored
- Set automatic transfer to rebuild over 3-6 months

---

## Phase 3: Debt Elimination

### Debt Inventory

```yaml
debt_inventory:
  - name: "Credit Card A"
    balance: 0
    interest_rate: 0
    minimum_payment: 0
    type: "revolving"
    tax_deductible: false
  - name: "Student Loan"
    balance: 0
    interest_rate: 0
    minimum_payment: 0
    type: "installment"
    tax_deductible: true
```

### Strategy Selection

| Method | How It Works | Best For | Psychology |
|--------|-------------|----------|------------|
| **Avalanche** | Pay highest interest first | Mathematically optimal, saves most money | Disciplined people |
| **Snowball** | Pay smallest balance first | Fastest "wins", builds momentum | Need motivation |
| **Hybrid** | Pay any debt < $500 first, then avalanche | Quick wins + math optimization | Most people |

### Debt Priority Order

1. **Payday loans / title loans** (300%+ APR) — eliminate immediately, even if it means selling things
2. **Credit cards** (15-30% APR) — aggressive payoff
3. **Personal loans** (8-15% APR) — steady payoff
4. **Auto loans** (4-8% APR) — pay minimum unless rate > 6%
5. **Student loans** (3-7% APR) — pay minimum, invest the difference if rate < 5%
6. **Mortgage** (3-7% APR) — usually don't accelerate, invest instead

### The Crossover Rule

**If debt interest rate > expected investment return (historically ~7-10% stocks):**
→ Pay off debt first

**If debt interest rate < expected investment return:**
→ Pay minimum on debt, invest the difference

**Grey zone (4-7%):**
→ Split extra money 50/50 between debt payoff and investing

### Debt Payoff Accelerators

1. **Balance transfer** — 0% APR cards (watch transfer fees, 3-5%)
2. **Refinance** — lower rate on student loans, mortgage, auto
3. **Consolidation** — single payment, potentially lower rate
4. **Income boost** — side income dedicated 100% to debt
5. **Expense audit** — cancel subscriptions, negotiate bills
6. **Sell assets** — unused items → debt payoff

### Credit Score Management

| Factor | Weight | How to Optimize |
|--------|--------|----------------|
| Payment history | 35% | Never miss a payment — automate minimums |
| Credit utilization | 30% | Keep below 30%, ideally below 10% |
| Length of history | 15% | Don't close old cards |
| Credit mix | 10% | Installment + revolving is good |
| New credit | 10% | Limit hard inquiries |

---

## Phase 4: Budgeting System

### Budget Template

```yaml
monthly_budget:
  month: "YYYY-MM"
  income:
    salary_net: 0
    side_income: 0
    other: 0
    total: 0
  
  fixed_expenses:  # ≤50% of income
    housing: 0
    utilities: 0
    transportation: 0
    insurance: 0
    debt_minimums: 0
    groceries: 0
    childcare: 0
    subscriptions_essential: 0
    subtotal: 0
    percent_of_income: 0
  
  financial_goals:  # ≥20% of income
    emergency_fund: 0
    retirement: 0
    investments: 0
    debt_extra: 0
    savings_goals: 0
    subtotal: 0
    percent_of_income: 0
  
  lifestyle:  # ≤30% of income
    dining_out: 0
    entertainment: 0
    shopping: 0
    travel_fund: 0
    hobbies: 0
    personal_care: 0
    gifts: 0
    subscriptions_fun: 0
    subtotal: 0
    percent_of_income: 0
  
  variance: 0  # income - all expenses (should be ≥ 0)
```

### Expense Tracking Methods

| Method | Effort | Best For |
|--------|--------|----------|
| **Envelope system** | High | Cash-heavy, needs discipline |
| **App tracking** (YNAB, Mint) | Low | Tech-savvy, automated |
| **Spreadsheet** | Medium | Control-oriented, custom |
| **Agent-tracked** | Low | Let AI categorize + alert |
| **Reverse budgeting** | Lowest | Auto-transfer savings first, spend rest |

### Reverse Budgeting (Recommended)

The simplest effective system:

1. **Day 1 of month**: Auto-transfer savings/investment target to separate accounts
2. **Day 1 of month**: Auto-pay all fixed bills
3. **Remaining**: Spend freely — guilt-free because goals are already funded
4. **Monthly**: Review if remaining amount felt tight or generous → adjust

### Subscription Audit

Run quarterly:
- List every recurring charge
- Score each 1-5 (value received)
- Cancel anything scoring