Income Planning Tool
Work backward from your target monthly income to find exactly how large your investment portfolio needs to be — using the 4% Rule and safe withdrawal methodology.
Written by Mike Starr
Founder, StackedTomorrow · M.S. Organizational Management
Last Reviewed: August 2026
Educational Content Only. All content on this page is provided for informational and educational purposes only. It does not constitute financial, investment, legal, tax, or retirement advice. The calculators and projections shown are illustrative models — not predictions or guarantees of future performance. Past performance does not guarantee future results. Always consult a qualified financial professional before making investment or retirement decisions.
Calculate the portfolio that replaces your paycheck — permanently.
Significant retirement flexibility and early exit potential.
Required portfolio by withdrawal rate strategy
Higher yield targets reduce the required portfolio — but higher yields often require higher-risk assets. The 4% rule is widely considered the safe withdrawal standard.
Investment-based passive income is money generated by your portfolio without requiring active work. Unlike rental income (which involves property management) or online businesses (which require ongoing effort), a properly constructed investment portfolio can generate income through two mechanisms: dividends and interest (cash distributed by investments) and systematic withdrawals (selling small portions of appreciating assets).
The passive income framework used by most financial planners centers on the safe withdrawal rate — the percentage of a portfolio you can withdraw annually without depleting it over a long retirement. Research by William Bengen (1994) established 4% as the historically sustainable rate for 30-year retirements using a 50–75% equity portfolio.
The inverse of this rate — multiplying annual spending by 25 — gives the required portfolio size. This relationship is foundational to FIRE (Financial Independence, Retire Early) planning and virtually all passive income calculators, including this one.
The table below shows the required portfolio for common monthly income targets at two withdrawal rates: 4% (standard) and 3.5% (conservative, recommended for early retirees with 40+ year horizons).
| Monthly Target | Annual Target | Portfolio @ 4% |
|---|---|---|
| $2,000 | $24,000 | $600,000 |
| $3,000 | $36,000 | $900,000 |
| $4,000 | $48,000 | $1,200,000 |
| $5,000 | $60,000 | $1,500,000 |
| $7,500 | $90,000 | $2,250,000 |
| $10,000 | $120,000 | $3,000,000 |
Source: Calculations: Portfolio = Annual Income ÷ Withdrawal Rate. For educational reference only. Actual results depend on return rates, inflation, taxes, and market conditions.
Investment portfolios generate passive income through four distinct mechanisms, each with different characteristics:
1. Index Fund Returns
Systematic withdrawals from broad market index funds (S&P 500, Total Market). Total return approach — price appreciation + dividends reinvested. Most flexible and diversified.
~7% historical real return, withdraw 4%
2. Dividend Income
Quarterly cash payments from dividend-paying stocks and ETFs. Portfolio yields 2–5% annually. Income received without selling shares.
2–4.5% typical dividend yield
3. Bond Interest
Fixed coupon payments from government and corporate bonds. Predictable income stream. Stable but lower returns than equities. Best in portfolios near or in retirement.
3–5.5% current yields (varies)
4. REITs
Real Estate Investment Trusts distribute 90% of taxable income as dividends. Real estate exposure without direct property ownership. Higher yields, higher volatility.
3–6% typical REIT yields
Most people transition to investment passive income in phases rather than all at once. The three-phase model:
Phase 1: Accumulation
Focus entirely on portfolio growth. Reinvest all dividends and returns. Maximize tax-advantaged accounts (401k, IRA, HSA). Don't optimize for yield — optimize for total return. This phase typically spans 15–30 years.
Phase 2: Transition
As FIRE date approaches, gradually shift toward income-generating assets. Build a 1–2 year cash cushion to protect against sequence-of-returns risk. Begin modeling actual withdrawal strategy. Consider bond ladder for first 5 years of expenses.
Phase 3: Distribution
Systematically withdraw 3.5–4% annually. Monitor portfolio health annually. Adjust spending during prolonged market downturns. Reassess strategy every 3–5 years based on portfolio performance and life circumstances.