What Is the Residual Income Stack Simulator? (Full Guide)
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Why Most Passive Income Calculators Miss the Point
Almost every free "passive income calculator" on the web solves one narrow problem: given a lump sum, a return rate, and a number of years, how much monthly income comes out the other end. That's useful for one scenario — a single investment portfolio compounding quietly in the background. It's a poor match for how most people actually build residual income in the real world.
In practice, residual income rarely comes from one source. A retiree might have dividend stock income, a rental property, and a small royalty stream from a book they wrote a decade ago. A side-hustler might have affiliate commissions, a digital product, and a high-yield savings account. Each of these streams behaves differently — some grow, some stay flat, some quietly decay — and no single-input calculator captures that mix.
What the Simulator Actually Calculates
The Residual Income Stack Simulator lets you enter up to eight streams individually. For each one, you set a name, a current monthly dollar amount, a trajectory type (Growing, Stable, or Declining), and an annual rate that drives that trajectory. The tool then projects every stream year-by-year, out to whatever horizon you choose (up to 50 years), and stacks them into a single combined monthly total.
From that combined projection, three outputs are generated. First, a Freedom Date — the year your total projected monthly income first meets or exceeds a target expense number you set. Second, a Stream Diversification Index, a 0–100 score derived from a Herfindahl-style concentration calculation, so a portfolio leaning on one dominant stream scores lower than one spread evenly across several. Third, the Perpetual Income Score, which blends your progress toward the target, your diversification score, and the share of your streams that are evergreen rather than declining.
Who the Tool Is Built For
The simulator is aimed at three overlapping groups: people planning early retirement or financial independence who want to see when a mix of income sources could realistically replace a paycheck; side-income builders juggling several small revenue streams who want a single number that captures how resilient that mix really is; and content creators, authors, or small business owners weighing whether to add another royalty or affiliate stream versus concentrating on one.
Frequently Asked Questions
Is the Residual Income Stack Simulator free to use?
Yes. It runs entirely in your browser at no cost, with no signup required to see your results.
What data does the simulator use?
It uses only the numbers you enter for each income stream: current monthly amount, growth type, and annual rate. It does not pull live market data — it is a modeling and planning tool, not a live-feed forecaster.
What is the Perpetual Income Score?
A 0–100 composite score built from three factors: how close your projected income gets to your stated target, how diversified your streams are, and how many of your streams are evergreen rather than declining.