Types of SIP — The Choices on the Form Nobody Explains

This is the choice with the largest consequence and the least discussion.

A fixed tenure SIP has an end date written into it. On that date it simply stops, and nothing tells you in advance. Plenty of people discover months later that their instalments ended two years after they started, because the form asked for a period and somebody wrote three years without thinking about it.

A perpetual SIP has no end date and runs until you instruct otherwise. Some forms represent this with a far-future date rather than a blank.

For long-horizon money, perpetual is almost always the sensible choice. The risk you are protecting against is not running too long, since you can stop at any time. It is stopping by accident and not noticing, which our post on restarting a SIP you stopped describes.

A step-up instruction raises the instalment automatically at a set interval, usually once a year, by an amount or a percentage you decide at the start.

This matters because a fixed amount quietly shrinks against a growing income, and raising it manually is the adjustment people most often intend and never make. Our page on the step-up SIP covers it in full.

If your provider offers it, this is the single most useful box on the form. Set it at the outset, tie the increase to roughly when increments arrive, and the most valuable adjustment available happens without you doing anything.

Two less common arrangements, both of which sound cleverer than they are.

A flexi SIP lets the amount vary between instalments, either by your instruction or according to a formula that invests more when prices are lower. The idea is reasonable and the practical difficulty is that a varying debit makes the household cash flow harder to manage, which is the thing that usually breaks a SIP.

A trigger SIP invests when a stated condition is met, such as an index level. That is timing wearing the costume of a systematic plan, and it gives up the main advantage of not having to be right, as our page on rupee cost averaging explains.

Our view is that both are answers to a problem most households do not have. The plain monthly instruction with a step-up does more.

People treat these as one thing and they are not, which causes a specific and avoidable problem.

The SIP is the instruction to invest. The bank mandate is the separate authorisation permitting a certain maximum to be debited from your account. The mandate has to be registered and approved before any instalment can run, which is why a first SIP usually starts the following month rather than the one you intended.

The part that catches people is the limit. If the mandate authorises a certain maximum and you later want to raise your instalment beyond it, or add a second SIP on the same mandate, you may need a fresh one. Setting the mandate limit comfortably above your starting instalment at the outset saves that trouble later.

Our post on registering a SIP sets out the sequence and how long each step takes.

Most providers offer a choice of dates in the month, and people overthink it.

No date reliably produces a better outcome, and over a long SIP the difference between one date and another is very small. What matters is that the balance is reliably there, so a date shortly after your salary arrives is the practical answer.

Holidays and weekends shift the processing to the next business day, which our page on the cut-off time explains, and that is normal rather than a failure. People with irregular income should read our pages on SIP for freelancers and SIP for farmers, where a fixed date is the wrong shape entirely.

Two more choices sit on the same page and both get ticked without explanation.

The plan option. Growth or a payout, which decides whether gains stay inside the scheme or are periodically distributed to you. For somebody building towards a future date, growth is almost always the right answer, as our page on growth versus IDCW sets out.

A related confusion worth clearing while you are here: a scheme whose category name mentions dividends does not pay you anything either. The payout is a way of selecting companies, not a way of paying investors, which our page on dividend yield funds explains.

Direct or regular plan. Two versions of the same scheme with different costs, covered honestly on our page about direct versus regular plans.

Neither of those is about the SIP mechanism, and both will outlast the instruction, which is why the five minutes spent on the form deserves more attention than it gets. Households whose income rises quickly should also read our page on SIP for IT professionals, where the step-up choice matters most.

For most households, the combination is unglamorous.

• Perpetual, so nothing ends by accident.
• Step-up enabled from the start, tied to increment time.
• A date a few days after salary, chosen for reliability rather than for NAV.
• A mandate limit comfortably above the starting instalment.
• A plain fixed amount, rather than a flexi or trigger arrangement.

None of that involves choosing a scheme, and all of it is decided in the five minutes somebody usually spends ticking boxes. If you want to check how your existing instructions are actually set, that is ordinary work here. Get in touch, and our page on how much to invest covers the amount itself.