A sophisticated simulator for mutual fund investors to model the financial impact of switching a Systematic Investment Plan (SIP) from one fund to another. Users can define the original fund's investment history (monthly SIP amount, start/end dates, and NAVs) and then specify the details of the 'switch' (switch date, new fund's NAV). The tool calculates the exact number of units sold, the redemption amount, the units purchased in the new fund, and the new cost basis, providing a clear picture of the transaction's outcome. It's essential for planning tax implications and understanding portfolio adjustments.