Lump Sum vs STP: Which Should You Choose?

A lump sum means investing the whole amount in one go, on one day, at that day NAV. Your entire money is exposed to the market from the start.

Our page on lump sum investment explains it in detail.

In an STP, you first invest the full amount in a liquid, overnight or short-term debt fund. Then a fixed amount is transferred automatically, every week or month, into an equity fund of the same fund house. Over months, the money moves gradually into equity.

Our page on STP explains how to set one up.

Because markets have tended to rise over long periods, money invested earlier has more time in the market. If the goal is many years away and you are comfortable seeing a sharp fall soon after investing, a lump sum can be reasonable. Some investors also use lump sums for smaller amounts where spreading out adds little.

If the amount is large compared with your existing investments, if markets have risen a lot recently, or if you know a fall would make you panic and sell, an STP is often the wiser choice. It reduces the chance of putting everything in just before a correction.

Our page on market corrections explains how often falls happen.

Ask yourself two questions. If I invest everything today and the market falls sharply next month, how will I feel? If I go slowly and the market rises sharply instead, how will I feel? Choose the option whose bad outcome you could live with more easily. That is often more useful than trying to predict markets.

Many investors spread an STP over six to twelve months. Too short, and it is almost a lump sum. Too long, and much of the money sits in debt funds for years, away from the long-term goal. There is no perfect length; pick one and stick to it.

The money waiting to be transferred should sit in a steady fund, like a liquid, overnight or ultra-short duration fund, from the same fund house as the target equity fund. This keeps it safe while it waits.

Our pages on liquid funds and overnight funds explain these.

The whole point of an STP is to keep buying through ups and downs. Stopping it during a fall defeats the purpose. Let it run as planned.

An SIP invests from your monthly income. An STP invests from a lump sum you already have. Both use the same idea of investing gradually. Many investors run both: SIPs from salary, and an STP for a one-time amount.

Our page on SIP versus STP explains the difference.

Some investors put part of the money in at once and run an STP for the rest. This gets part of the money working immediately while reducing timing risk on the remainder. It can be a comfortable compromise.

Whichever route you choose, first make sure your emergency fund is complete, expensive debts are cleared, and money needed within a few years is kept out of equity.

Our page on investing a windfall explains these steps.

Each transfer in an STP is a redemption from the source fund, which can have tax consequences and, in some cases, exit loads. Check the scheme documents. We do not offer tax services; a tax adviser can help.

Our page on exit load explains when charges apply.

If you already invested a lump sum and the market fell soon after, do not panic. If the goal is long-term, staying invested and continuing SIPs is usually better than selling at a loss.

Our post on investing a lump sum at the top explains what to do.

Many fund houses allow daily, weekly or monthly STP transfers. Weekly transfers spread the money across more dates, which smooths timing a little more. Monthly transfers are simpler to track. The difference over a long period is usually small, so pick what you find easier.

If markets fall a lot while your STP is running, the remaining transfers buy at lower prices, which is helpful. Some investors choose to speed up the transfers during a deep fall, but this is a judgement call. Simply letting the plan run as set is perfectly fine.

Our page on investing when the market falls explains the thinking.

Choose the equity fund at the end of the STP with the same care as any long-term investment. It should match the goal and time frame. An STP only changes how you enter the fund, not whether the fund itself is right for you.

• Lump sum: all in at once, full exposure from day one.
• STP: gradual move from a debt fund into equity.
• Choose STP if a quick fall would upset you.
• Either way, keep the long-term goal in mind.

We are distributors rather than investment advisers and we recommend no schemes. If you want help setting up an STP, get in touch.