People starting a mutual fund SIP often spend time deciding the “best” date for investment. Some prefer the first day of the month because their salary has just been credited. Others choose the 10th or 15th, while some invest closer to the month-end.
But does choosing the 1st instead of the 10th or 25th really make a big difference to your wealth after 10 years?
For a long-term investor, the SIP date usually matters much less than staying invested regularly. Markets do not follow a fixed monthly pattern. There is no rule that stocks are always cheaper on the 1st, higher on the 10th, or lower again on the 25th.
A SIP simply buys mutual fund units at the NAV available on the applicable investment day. When markets are lower, the same SIP amount buys more units. When markets are higher, it buys fewer units. Over several years, investments are automatically spread across many different market levels.
Can different SIP dates give different returns?
Yes, there can be some difference. Suppose three investors each put Rs 10,000 every month in the same mutual fund for 10 years. One invests on the 1st, another on the 10th, and the third on the 25th. All three will invest a total of Rs 12 lakh over 10 years.
However, their final corpus may not be the same because the NAV on each SIP date will be different. In some months, the person investing on the 1st of May gets a lower NAV. In another month, the 25th may turn out to be better. These differences keep changing as markets rise and fall.
It is therefore difficult to say in advance that one particular date will consistently produce the highest return.
Does investing earlier in the month help?
There can be a small advantage simply because money invested earlier gets a few extra days in the market.
For example, if Rs 10,000 is invested on the 1st instead of the 25th every month, each installment gets roughly three extra weeks of investment time.
Assuming a steady 12 per cent annual return, a Rs 10,000 monthly investment over 10 years could be around Rs 22.4 lakh when invested near the start of each month. Moving every contribution roughly 24 days later could reduce the illustration by only around Rs 15,000-20,000.
Actual mutual fund returns will not grow in such a smooth manner, so real results can be very different.
Importance of salary date
Instead of trying to predict the best day of the market, it may be more useful to choose a SIP date that matches your cash flow.
If your salary comes on the last day of every month, keeping the SIP on the 2nd or 5th can work well. The investment happens before the money gets spent elsewhere.
If your salary is credited around the 7th, a SIP on the 10th may be easier to maintain.
The important point is that there should be enough balance in the bank account when the SIP is due.
A missed SIP because of insufficient funds can matter more than whether your normal SIP date is the 1st or the 25th.
What about market crashes?
Some investors try to select an SIP date, hoping that markets will regularly fall around that time. That approach is difficult to follow because major market movements can happen on any day.
A sharp correction may happen in the 6th month and, in another month, on the 23rd. Nobody can reliably know this beforehand.
The basic purpose of SIP investing is to avoid having to make such timing decisions every month.
What should investors focus on instead?
Over 10 or 15 years, the amount you invest, the return generated by the fund, and how consistently you continue the SIP are likely to make a much bigger difference than the exact date.
Increasing the SIP when income rises can also have a bigger impact on the final corpus.
So, whether you choose the 1st, 10th, or 25th, pick a date that is convenient and allows you to invest without interruption. For a long-term SIP, consistency matters far more than finding a supposedly lucky date.
Disclaimer: Our calculations are projections and not investment advice. Do your own due diligence or consult an expert for financial planning.