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GitHub RepositoryInvestSim
See how contributions, inflation, fees, and taxes reshape a long-term investment plan.
Summary
InvestSim lets users adjust the assumptions behind a long-term investment and immediately see how they affect the result. Contributions, returns, inflation, fees, and taxes are modeled together, and charts with side-by-side scenarios expose the effect of every assumption.
From investment assumptions to a comparable long-term scenario
Assumptions
Users set contributions, returns, fees, and taxes
Simulation
The model calculates portfolio growth
Adjustments
Costs and inflation reshape the projection
Visualization
Charts expose change over time
Comparison
Alternative scenarios reveal tradeoffs
What the system handled
Models long-term growth, contributions, inflation effects, fees, taxes, and scenario comparisons.
Technology
Stack
Areas
Conclusions
- Combining contributions, inflation, fees, and taxes in one model shows why nominal growth alone can give an incomplete picture of long-term value.
- Side-by-side scenarios show which assumptions are responsible for the difference between forecasts.
- The simulator provides educational scenarios based entirely on user-defined assumptions; future market behavior remains uncertain.
Want to inspect the implementation?
The repository contains the source, setup notes, and development history.
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