Share prices (including ETF prices) drop when a dividend is paid out.

What's the empirical evidence for the exact amount of the drop? I found some old papers that mention that the stocks they looked at drop by about 90% of the dividend. Is that still the case on average?

I am mostly asking, because there are tax differences in the treatment of capital gains vs dividend income in lots of countries, and so the arbitrage portfolio is more complicated.

My strategy would be the opposite of dividend stripping: I want to be in the market at all times apart from when there's dividends. I want to get capital gains, but not dividends. My question boils down to: for eg Vanguard VT do existing arbitragers close the whole gap, or only eg 85% of the gap, because of withholding taxes? Ie do we have withholding tax-exempt arbitragers.

For context: I live in Singapore and am interested in minimizing US withholding taxes on US assets.

Basically, the question I want answered is: I am not subject to capital gains taxes at all, but I do pay 15% or 30% taxes on dividends. In expectation, does it make sense to sell and re-buy American domiciled index funds around their ex-dividend date?

I am especially interested in the ETFs VT and MVOL and similar.

  • 1. Waiting for Bob Baerker to post his go-to answer claiming that the stock exchanges enforce a price drop equal to the dividend. 2. Note that when you get down to fine details, measuring from last cum-dividend close to first ex-dividend close, one day's normal stock return can be significant. An average ~10% annual return is ~0.04% per trading day. The market's dividend yield is ~2%, so a typical quarterly dividend is ~0.5%. This explanation alone would suggest an average drop of ~90% of the dividend (say 0.46% instead of 0.5%) on ex-dividend day.
    – nanoman
    Commented Jan 5, 2020 at 0:45
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    @nanoman - Go to answer? Do you believe that share price isn't reduced by the amount of the dividend on the ex-div date? Commented Jan 7, 2020 at 5:28
  • It's a little difficult to answer this in general since tax laws vary so much by country. For example, in the US, most taxpayers pay the same rate for dividend income as they do for long-term capital gains. Could you add a country tag?
    – JimmyJames
    Commented Jan 9, 2020 at 19:29
  • @BobBaerker That's a rule that the NASD (now known as FINRA) implemented in 1994: "In the absence of an NASD rule governing open orders, members adjust open orders according to their own procedures, ... These procedures can vary from automatic adjustment, automatic withdrawal, reconfirmation of the order with the customer, or no action. .... As a result, investors may find that their open orders are executed without adjustment on or after the ex-date at a higher cost per share than they intended based on their valuation of the security."
    – JimmyJames
    Commented Jan 9, 2020 at 20:17
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    @JimmyJames I argued here that such open GTC orders play a minor role in short-term price discovery. And I interpret these questions as being about overnight dividend impact on actual trade prices rather than on quote calculations.
    – nanoman
    Commented Jan 9, 2020 at 23:26

3 Answers 3


This article: The Run-Up Before Ex-Dividend Date about the may be of use for you. I am not advocating or confirming the conclusions but the logic is relevant:

  • Price anomaly: the price of a dividend-paying stock tends to drift up before the ex-dividend date.
  • At the aggregate level, this upward drift takes place throughout the entire period from declaration date to ex-dividend date.

In other words, in lieu of other news and market sentiment, once the dividend is announced, the stock price is expected to increase during the period starting from the announcement to the ex-dividend date. The increase is expected to be the amount of the dividend. Once the ex-dividend date is past, the stock returns to it's fundamental value. Here's another article describing this at a higher level:

When a company pays a large dividend, the market may account for that dividend in the days preceding the ex-div date by a rise in the price of the stock. This is because buyers are willing to pay a premium to receive the dividend. However, on the ex-div date, the exchange automatically reduces the price of the stock by the amount of the dividend.

Another way to look at this is pretty intuitive, I think: if I am holding shares of a stock and I am due to receive a dividend payout tomorrow, it would be quite foolish for me to sell today if I am not compensated properly. The farther out in time that I receiving that payment, the less valuable it is at the current moment (NPV). Here's a visualization of the effect:

enter image description here

If we believe this (i.e. we believe in basic economics principles), if we hold a stock through the period before declaration through the ex-dividend date, the issuance of the dividend should have minimal impact on the value of the stock. In other words, we end up where we started plus the dividend.

Obviously, this is too simple because the fact that a company issues dividends at all has implications for it's fundamental value and if and when the dividend changes, that too could have major impact on the price. But again, to focus on the impact of the dividend declaration and payment alone, we want to imagine all of this is constant even though we know it never is in reality.

What as an investor can you do? If you believe the market is efficient, whenever you buy or sell the stock, you are getting a fair price. Let's assume you do or, like me, you think it's mostly true. I'll also assume the US. YMMV for other countries.

If you receive the dividend, you either pay the long-term capital gains tax rate (good) or income tax rate (bad). This mainly depends on how much income you have. If you are doing really well, you'll get hit with the income tax rate so you probably want to avoid this.

If you sell, you either pay long-term capital gains rate (good) or short-term capital gains rate (bad). It all depends on how long you have held it. To minimize the impact of dividends you could buy after the ex-dividend date and sell before or after the declaration. Aside from transaction fees, this might expose you to the short-term rate. Now if you've held this stock for a long time, it in theory doesn't matter when you sell but if you want to receive a premium for the dividend without income tax exposure, you can sell right before the ex-dividend date.

So this brings us to the heart of your question. Consider the assertion in this article:

This causes the price of a stock to increase in the days leading up to the ex-dividend date. In general, the increase is about equal to the amount of the dividend, but the actual price change is based on market activity and not determined by any governing entity.

On the ex-dividend date, investors may drive down the stock price by the amount of the dividend to account for the fact that new investors are not eligible to receive dividends and are therefore unwilling to pay a premium.

I've emphasized the key phrase here: "about equal" which gets at the core question you are asking. I did a little hunting and came across this paper:

Results show that out of the variables only earning per share and dividend payout ratio have a significant positive relationship while return on equity has negative significant relationship with the dependent variable. On the other hand all other variables, i.e. dividend per share, retention ratio and profit after tax have an insignificant relationship with stock market price.

But this is really about how issuing dividends affects the fundamental price of the company:

One percent growth in dividend payout ratio will cause 0.5848% rise in stock market price and one percent decline in dividend payout ratio will cause 0.5848 % fall in stock market price.

That's not really the question you are asking but it's maybe interesting to help develop your strategy. This paper seems to be a little closer to what you are looking for:

The results of this empirical study indicate that the stock prices move upward significantly after dividend announcements. Abnormal return (AR) and cumulative abnormal return (CAR) from the market model are statistically significantly revealed. The results confirm dividend signalling theory as the dividend announcements have significant impact on share prices.

I'm not able to see easily that it shows a % factor like what you have in your question. Instead it focuses on abnormal returns (AR) and cumulative abnormal returns (CAR) which seems to be common in these kinds of papers. There may be a way to turn that into what you are looking for but I'm out of time for this answer.

  • Thanks, that's pretty extensive. Basically, the question I want answered is: I am not subject to capital gains taxes at all, but I do pay 15% or 30% taxes on dividends. In expectation, does it make sense to sell and re-buy American domiciled index funds around their ex-dividend date?
    – Matthias
    Commented Jan 10, 2020 at 14:29
  • @Matthias If you pay no capital gains at all, I guess that might be a strategy you could consider. My only hesitations are 1. you will incur fees on both transactions 2. there's some risk that the price could jump more than expected post ex-dividend e.g. on news. For 1, 30% is a big chunk so there's a lot of space to cover the fees and the and the gap between the drop and dividend. 15% is a little more iffy. For 2, you have to decide whether you are willing to take on that risk or let go of the stock position entirely.
    – JimmyJames
    Commented Jan 10, 2020 at 15:33

I think there isn't a definite answer on how much exactly the share of a specific stock price drops on dividend-ex day, at least there might be a statistical answer.

I've seen a couple of quite old studies (starting from 1960's - maybe you refer to them in your initial post?) which claim that there is difference between the marginal price drop and the dividend but there is also a "newer" one here from 1993, which claims that there, on average, isn't any significant difference.

Nevertheless, there is an investment-strategy, called "dividend-stripping", that tries to earn money exactly by the difference between marginal price drop and dividend. The advantage, of course, is a very short marked exposure and - providing that this difference indeed exists - the statistics on your side. I've read an article about this recently which, of course, isn't that scientific as the research-paper from 1993 but more up-to-date. Furthermore, the author raises the assumption that this effect might be different in the US and the Asian stock market (because - again an assumption - US markets might tend to raise slightly overnight while Asian markets tend to fall slightly overnight).

Personally, I believe that there can't be a significant difference over a long period of time since in an effective market some market actors will take advantage of and therefore the gap will close. Maybe that's (part of) the reason why studies from different centuries come to different results.

So, I guess that there still is no final answer on this question, therefore take these lines as some brainstorming/start for some further research - I hope that helped a bit to answer your question.

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    On the ex-div date, share price is reduced by the exact amount of the dividend. That occurs before the stock/ETF resumes trading on the ex-div date. How much a stock drops that DAY is a different story. Commented Jan 7, 2020 at 5:35
  • My strategy would be the opposite of dividend stripping: I want to be in the market at all times apart from when there's dividends. I want to get capital gains, but not dividends. My question boils down to: for eg VT do existing arbitragers close the whole gap, or only eg 85% of the gap, because of withholding taxes? (Ie do we have withholding tax-exempt arbitragers.) Edited the question.
    – Matthias
    Commented Jan 9, 2020 at 6:23
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    @BobBaerker Yes, I know about the automatic reduction of open orders. It's not the point of the question, though.
    – Matthias
    Commented Jan 9, 2020 at 6:39
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    "since in an effective market some market actors will take advantage of and therefore the gap will close" Could this be explained by tax policy? People who own large positions in a company are likely to be subject to income tax on dividends. Therefore, might they time sales to be prior to the ex-dividend date as part of a tax optimization strategy and put negative pressure on the dividend declaration price anomaly.
    – JimmyJames
    Commented Jan 9, 2020 at 19:57
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    In §6 they conclude: "In reviewing all of our results, it is striking (...) price drop is almost exactly equal to dividend yield." And "On average, however, ex-dividend percentage price drop moves almost exactly one-for-one with dividend yield. (...) our results suggest that one-for-one marginal price drop has been a good rule of thumb, at least on average, over the last two and one-half decades". Indeed, they mention that there was one significant exception which was excluded (which you may refer to?). However, the conclusion is that they didn't observe a significant difference at all.
    – pcalc
    Commented Jan 12, 2020 at 10:49

I believe long time ago the stock price did not drop as much as the dividend but investment firms started taking advantage of this so now it could very well be they on average do drop as much as dividend. The price drop occurs on the ex-dividend date. You could run a study to see.

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