Investment Calculator: expose every assumption behind the projection

Enter starting balance, contribution amount and timing, horizon, return, compounding, fees, taxes, inflation, and withdrawal assumptions explicitly. Separate nominal from inflation-adjusted results and test conservative, central, and optimistic scenarios. Confirm whether contributions occur at the beginning or end of each period. Round only display values. A projection illustrates assumptions; it is not a guarantee or personalized financial recommendation. For a discrepancy, share redacted inputs, formula convention, expected value, and actual output.