Does Buying the Dip Improve Long-Term Outcomes?
Keeping some of each month's savings aside to buy when prices fall is one of the most common pieces of do-it-yourself strategy. We tested it across every fifteen-year stretch of the Indian market, with tax included — and then tested the exact opposite rule to check the answer.
Updated 10 September 2026
The decision people actually face
Most advice on "buying the dip" argues from a chart with the recovery already drawn on it. Look how much better you would have done buying there, at the bottom, instead of at the top.
Nobody has ever had that choice. You cannot decide, afterwards, to have bought at a low point.
The real decision looks like this: your salary arrives every month, you can afford to invest a certain amount, and you are wondering whether to put all of it in now or hold some back for a better price. That is a question with an answer, and the answer can be measured.
How we tested it
We ran four different savers side by side through every fifteen-year stretch of the Indian market we have data for — 147 overlapping periods, each starting a month after the last. All four save exactly the same amount every month. The only difference is what they do with it.
- Steady. Invests the whole amount every month, regardless of what the market is doing.
- Saving for a fall. Invests half each month and puts the other half in a savings account. When the market drops 10.0% below its recent high, the whole accumulated pot goes in at once.
- Saving for a rise. Exactly the same, except the pot goes in when the market climbs 10.0% above its recent low. This is the control — more on why it matters below.
- Never investing the other half. Invests half and leaves the rest in the savings account for the entire fifteen years.
The savings account earns the retail term deposit rate that actually prevailed on each date — 5.1% to 9.8% across the record — and that interest is taxed annually. That is a generous assumption for money that has to be available at any moment, and deliberately so: it gives the arms holding cash back the best rate a household could realistically have got. At the end everything is sold and capital gains tax is paid, worked out holding by holding — units held over a year taxed as long-term gains, the rest as short-term. Rates are the current Indian ones for listed equity.
Returns are shown as XIRR, which accounts for money going in at different times. A simple growth percentage would be misleading when contributions are irregular.
The result
Show these numbers as a table
| Strategy | Poor outcome | Typical | Good outcome |
|---|---|---|---|
| Invested every month, whatever the market was doing | +10.85% | +12.46% | +14.77% |
| Half invested, half saved for a fall | +10.92% | +12.51% | +14.74% |
| Half invested, half saved for a rise of the same size (the control) | +10.82% | +12.45% | +14.82% |
| Half invested, half never invested at all | +8.39% | +9.33% | +11.20% |
The typical saver who invested steadily ended up with +12.46% a year. The one who held money back for falls got +12.51%. Over fifteen years, across 147 different periods, that is the entire difference.
The waiting strategy did not sit idle for long, incidentally — the trigger fired about 33.4 times over the fifteen years, so roughly twice a year the accumulated pot went in.
How often did waiting actually win?
An average can hide a strategy that wins big occasionally and loses small often. So here is every period individually, showing how much better or worse waiting did than investing steadily.
Show these numbers as a table
| How much better or worse holding back did, per year | Number of periods | Share |
|---|---|---|
| -0.24% to -0.22% | 1 | 0.7% |
| -0.22% to -0.20% | 2 | 1.4% |
| -0.20% to -0.18% | 1 | 0.7% |
| -0.18% to -0.17% | 2 | 1.4% |
| -0.17% to -0.15% | 3 | 2.0% |
| -0.15% to -0.13% | 2 | 1.4% |
| -0.13% to -0.11% | 2 | 1.4% |
| -0.11% to -0.09% | 3 | 2.0% |
| -0.09% to -0.07% | 5 | 3.4% |
| -0.07% to -0.06% | 6 | 4.1% |
| -0.06% to -0.04% | 5 | 3.4% |
| -0.04% to -0.02% | 16 | 10.9% |
| -0.02% to -0.00% | 10 | 6.8% |
| -0.00% to +0.02% | 14 | 9.5% |
| +0.02% to +0.04% | 16 | 10.9% |
| +0.04% to +0.05% | 12 | 8.2% |
| +0.05% to +0.07% | 12 | 8.2% |
| +0.07% to +0.09% | 17 | 11.6% |
| +0.09% to +0.11% | 18 | 12.2% |
Waiting came out ahead in 57.1% of periods. In the best case it gained +0.11% a year. In the worst it lost 0.24% a year. The middle result was +0.05% a year.
Do not read the win rate as the finding. These differences are so small that the count of which side won is not a stable number — when this experiment was rerun crediting the cash at observed deposit rates rather than a flat assumption, a change of about two hundredths of a percentage point a year, the share of periods in which waiting came out ahead moved by more than fifteen points. A statistic that moves that far on a change that small is telling you the two strategies are indistinguishable, not which one is better.
The magnitudes are the finding, and they are tiny. For context, the difference between the best and worst outcome here is smaller than the effect of a single percentage point of fund charges.
The check that makes this convincing
Here is the problem with stopping there. "Waiting for a fall didn't help" could mean the market is unpredictable — or it could mean we picked a bad rule.
So we ran the mirror image: hold the money back and invest it when the market rises 10.0% above its recent low. If dip-buying has any special quality, doing the exact opposite should be noticeably worse.
It returned +12.45% a year, against +12.46% for steady investing. Also no difference.
That is the finding. It is not that buying dips is a bad rule and something else would work better. It is that when you deploy the money barely matters, and any rule that decides the timing produces roughly the same result as not having a rule at all.
What did matter
Look again at the last row of the first chart — the saver who kept half the money in the savings account and never invested it. That one returned +9.33% a year against +12.46%.
That gap is 3.13% a year, every year, for fifteen years. It dwarfs everything else on this page.
The lesson is not subtle. Waiting for the right moment costs you almost nothing, and gains you almost nothing. Not investing costs you a great deal. If holding cash back for dips means the money sits there for years because the fall you were waiting for never looked big enough, the cost is in that last row, not in the earlier ones.
If you have a lump sum rather than a monthly salary
The question is slightly different if you have a large amount to invest at once — an inheritance, a bonus, a maturing deposit. Here the comparison is investing it today against waiting for a fall.
| What you did | Typical return a year | Time left in the bank |
|---|---|---|
| Invested when the money arrived | +13.87% | 0.0% |
| Waited for a fall of 10% | +13.91% | 3.7% |
Waiting for a ten percent fall returned +13.91% a year against +13.87% for investing immediately. Again, effectively nothing.
| What you did | Typical return a year | Time left in the bank |
|---|---|---|
| Invested when the money arrived | +13.87% | 0.0% |
| Waited for a fall of 20% | +13.06% | 16.0% |
Holding out for a twenty percent fall is worse: +13.06% against +13.87%, with the money sitting in cash 16.0% of the time. Bigger discounts are rarer, so the wait is longer, and the waiting is the cost.
What this test cannot tell you
It covers one country over one stretch of history. A market that drifted sideways for a decade would produce a different table.
It assumes you follow the rule. Buying during a fall means buying when it feels most obviously wrong. A rule abandoned at the moment it triggers is worse than either alternative.
It uses one set of assumptions for the savings rate, the tax slab and the size of fall that triggers a purchase. Different assumptions move the numbers a little; nothing we tried moved the conclusion.
Costs are not included. Brokerage and fund charges would fall slightly harder on the strategies that trade more, which are the waiting ones.
What to take away
A fall is not a signal that the bottom has arrived, and the evidence here says the search for the right moment is not worth the effort it costs you.
Never move emergency savings, or money needed within a few years, because prices dropped. Falls can deepen, and the Indian market's record includes declines that took years to recover.
If you want a mechanical way to buy more of what has fallen, rebalancing already does it — when one part of your portfolio drops, restoring your intended mix means buying more of it. No forecast required, and no pile of cash sitting idle waiting for a moment that may not come.
Educational content only. This is not personalised financial, investment or tax advice. Figures quoted are historical or illustrative and are not forecasts. Consult a qualified professional before acting on anything you read here.