One of the most persistent debates among retail mutual fund investors revolves around picking the ideal calendar window to automate monthly investments.

To settle this question, long-term asset studies looking at on which date of month should you start an SIP have analyzed over three decades of market history to identify clear patterns.

By calculating performance across various market cycles, financial researchers have tracked the exact impact of rupee-cost averaging on different days of the month.

The extensive 30 years of data reveal return calculations that might surprise short-term traders. The final data points show that over a multi-decade horizon, the performance gap between a Systematic Investment Plan (SIP) executed at the start, middle, or end of a month is practically negligible.

Instead of trying to time the market's monthly dips, historical trends show that the real drivers of long-term wealth creation are consistent discipline, steady accumulation, and maximizing your overall time in the market.