Perpetual or fixed-tenure SIP

One small setting when you start a SIP is its tenure: you can set an end date, giving it a fixed tenure, or leave it open-ended, which is usually called a perpetual SIP. It is an easy box to tick without thinking, so here is what each one actually does.

What a fixed-tenure SIP does

A fixed-tenure SIP has a stated end date — say three years out, or ten. On that date the instalments simply stop; the mandate has done its job and no more money is collected. The units you have bought stay invested and remain yours; only the buying stops. The appeal is that it ends by itself, with nothing to remember. The catch is the opposite of the appeal: if you set the date shorter than the goal, the SIP can lapse in the middle of your plan, and unless you renew it, the investing quietly stops while the goal is still years away.

What a perpetual SIP does

A perpetual SIP has no end date you set — in practice the form often records a far-off default date many years out — and it keeps running until you tell it to stop. Its advantage is that it never lapses by surprise: the habit continues until you decide otherwise. The thing to be clear about is that perpetual is not the same as unmanaged. An open-ended mandate still needs the occasional look — is the amount still right, does the scheme still fit the goal — because “set and forget” can drift into “set and neglect”.

Does the choice change your returns?

No. The tenure setting only decides when the instalments stop on their own; it does nothing to how the money invested behaves. The same amount in the same scheme compounds the same whether the mandate was written as three years, thirty, or open-ended. This is an administrative choice about the mandate, not an investment decision about outcomes.

You are not locked in either way

Neither setting traps you. Whichever you pick, you can pause, stop or redeem at any time, subject only to any lock-in or exit load on the scheme itself. A fixed tenure does not force you to keep paying until the end date, and a perpetual one does not bind you to pay forever — each is just a default for when the instalments end if you do nothing.

Which to choose

If you would rather the SIP police itself, set a fixed tenure that matches or comfortably exceeds your goal’s horizon, so it cannot lapse early. If you would rather it never stops without your say-so, choose perpetual and put a yearly reminder in your calendar to review it. Both are sound; the wrong move is only setting a tenure shorter than the goal, or choosing perpetual and then never looking again.

To put a date and an amount on that goal first, the goal-based SIP calculator works back from a target and a date to a monthly SIP, and the plan-by-goal pages walk through common goals.