No, your SWP won't eat through your retirement savings

Reader's question: How can investors grow their wealth through mutual funds without eroding the corpus while running an SWP? - Hiren Shah

You spend decades building a corpus. Then retirement arrives, and you think: how do I actually live off this money without watching it disappear?

One of the most common tools for this is a systematic withdrawal plan, or SWP. Just as a systematic investment plan (SIP) lets you invest a fixed amount every month, an SWP lets you withdraw a fixed amount every month from your mutual fund corpus. It is the retirement income equivalent of a salary. Predictable, regular and drawn from what you have already built.

The fear, however, is real: what if the withdrawals eat through everything faster than expected? What if the money runs out before you do?

The answer depends entirely on one thing: whether your corpus was built for the life you want to live. Let the numbers show you why.

Building the corpus

Say you invest Rs 10,000 every month into a mutual fund delivering a long-term average return of 12 per cent. No step-ups, no changes, just a steady monthly contribution for 15 years. You put in a total of Rs 18 lakh over this period. At the end of year 15, your portfolio is worth Rs 48 lakh. The extra Rs 30 lakh came from compounding—the process by which your returns start generating their own returns over time, so your money grows on itself, not just on what you put in.

Now, say you stop investing after year 15, but do not touch the money either. The corpus simply sits for five more years. In that time, it grows by another Rs 36 lakh without a single additional rupee from you. By the end of year 20, your portfolio stands at Rs 84 lakh. This is the power of compounding: staying invested does more for your wealth than any amount of fund-switching ever will.

The withdrawal phase

You have invested for 15 years and let the corpus grow for five. Now retirement begins. You need Rs 50,000 every month for at least the next 15 years, and you begin your SWP. This is the phase that unsettles most investors. Will the withdrawals leave me broke within a few months?

In this example, the answer is no. And here is why.

At retirement, it is standard practice to gradually move your corpus out of equity mutual funds and into something more stable. Short-duration debt funds, mutual funds that invest in bonds and other fixed-income instruments maturing within one to three years, are a common choice here. They are less volatile than equity funds and have historically delivered around 7-8 per cent returns over the long term. We will use 7 per cent to stay conservative.

Now, even if you withdraw Rs 50,000 every month without fail for 15 years, your corpus at the end still stands at Rs 75 lakh. This is because while you draw down a portion each month, the remainder continues growing at 7 per cent. The pool is never truly idle. Compounding does not stop just because withdrawals have begun.

Factor in taxes, and the picture still holds. When you withdraw from an equity mutual fund, the gains are subject to capital gains tax, a tax on the profit your investment has made.. After accounting for the Rs 1.25 lakh annual exemption and a 12.5 per cent tax on gains beyond that, your remaining corpus after 15 years of withdrawals comes to roughly Rs 46 lakh. Stretch the withdrawals to 20 years, and you are still left with around Rs 29 lakh.

The only scenario where the money runs out early is if the corpus genuinely sits still, parked in a savings account earning almost nothing. In that case, even before inflation bites, the money is gone around year 12.

When an SWP actually goes wrong

So when does an SWP fail? When the corpus is mismatched with the need.

Say you needed the same Rs 50,000 a month in retirement, but your investment period was only 10 years instead of 15. The money runs out in five years. Or say you invested for 30 years but contributed only Rs 1,000 a month, then tried to withdraw Rs 50,000 monthly after a five-year idle period. The corpus runs out in 11 years. The withdrawal amount is simply too large relative to what was accumulated.

The problem, in both cases, is not the act of withdrawing. It is that the corpus was never sized for the life being asked of it.

Work backwards from what you need

This is where real planning begins. If you know what you need every month in retirement, you can reverse-calculate how large your corpus needs to be. And from that, how much to invest each month to get there.

Say you need Rs 1 lakh every month for 30 years after retirement. Working backwards, your starting corpus, adjusted for taxes, needs to be around Rs 1.8 crore. To reach that, you need to invest roughly Rs 19,195 a month for 20 years. These figures do not account for inflation, and they assume the corpus draws down to zero by year 30. But the underlying logic is what matters.

You may not be able to run this calculation on the first day of your investment journey. But as your income grows and retirement comes into clearer view, this kind of backward planning is precisely what separates investors who outlive their corpus from those who do not.

The answer

Will an SWP destroy your wealth? Not if you plan well. The corpus keeps compounding even as you withdraw. The math is on your side.

What works against you is not the SWP itself. It is starting with too little, or withdrawing too much, or doing either without any thought to the other. Size the corpus right and the withdrawals will take care of themselves.

If you want a deeper, data-backed look at how retirees can balance growth, withdrawals and peace of mind, the December 2025 edition of Mutual Fund Insight magazine explores exactly this: how to stay rich long after your paycheques stop.

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This article was originally published on March 23, 2026.