If you never see the dividend for a fund, why does the ex-dividend date matter?

Question

I'm currently invested in an open-ended fund. As I understand it, neither I nor my broker see its dividend. We just wake up on the payment day and see that the unit price of the fund has moved more than we'd expect from the movements of the market, and that's that. Our unit number doesn't increase and we don't get any special notices. On dividend day, we don't get told anything more than what we do on any other market day. The unit price gets reported, and that's it. I believe this to be one such fund, as presented by a fairly typical broker.
Assuming that what I've said is accurate, why does the ex-dividend date matter to anyone? It seems that the only change that happens on the dividend date is that the unit price moves, so as far as I can tell, there shouldn't be any difference between someone who buys at price x a week before the ex-dividend date and someone else who also buys at price x a week after. Because they both hold units on the dividend date, it appears obvious to me that they will both benefit from the increase in unit price on that day, independent of when they bought.
Answers so far have pointed out that this is in fact an OEIC (not an ETF as the question originally had it) and that the dividends are constantly reinvested, making the dividend and ex-dividend date meaningless. However, I have three objections to this:

Doesn't this make taxing your dividends - a legally required step - impossible?
Official documents appear to contradict the idea of constant reinvestment. For example, as I read it, page 178 of this report says that the dividends paid on the dividend date for the fund linked above was 20.828558p per share (net) and page 194 informs us that it has been retained in the fund. It also provides these figures for their other funds, furthering the idea that this is not unusual.
If these dates are meaningless, why does anyone bother with equalisation? This is such a big point that it might even be enough to single-handedly answer this question, so I distrust any explanations that overlook it.

J. Mini · Accepted Answer

It's bad form to answer my own question, but the comments have reveals that the question was flawed. First of all, OJFord is right to point out that this is an OEIC and not an ETF. Furthermore, the question assumed that the dividend date was when the dividends accumulated from the fund's underlying stocks were reinvested. However, if you compare any accumulation class fund's percentage change in price (and not total return!) with its income class equivalent, you will see that this is usually false. For example, with the accumulation class in red and the income class in blue, this graph is what we get from the question's linked fund, showing that the divergence was only triggered by the ex-dividend date (mid May, with the dividend in mid July). This also implies that the dividends from the accumulation class were reinvested on the ex-dividend date, destroying the premise of the question.
So why does this confusion exist? This takes some background work. Ignoring the ex-dividend date for a moment, here is my understanding of how the dividend payments work for accumulation units in an OEIC:

As stated in the question, for an accumulation class fund neither you nor your broker get told what the value of the dividend was. There is a date when it's supposed to become relevant, the dividend date, but this is misleading because you won't see the dividend and it may have been reinvested at any prior point on or after the ex-dividend date. Ultimately, for accumulation type funds, the dividend date is little more than a tax/accounting detail.
If you want to find out what the dividend's value really was, you need to find the official documents from the fund. As with the example linked in the question, these confirm that a dividend exists and is reinvested back in to the fund. They also give its value. Incidentally, it's unclear to me if the tax man cares about this, so beware!

With this key fact - that the dividend is never seen leaving the fund - established, we can now ask the question that we were trying to answer: If the only thing that changes due to the fund's dividend is the unit price of the fund, why does the ex-dividend date matter? After all, I'll benefit from the change in unit price regardless of if I buy before of after the ex-dividend date.
Our answer to this is equalisation. That link explains it better than I can, but here is how it applies to this question:

Over time, the fund will accumulate cash due to the dividends that are paid to it from the shares that it owns. These are not reinvested until at least the ex-dividend date. However, the fact that the fund has this cash increases the value of the fund. Of course, some of this cash will be used to cover costs like staff expenses, but the important part is that...
On the ex-dividend date, a great deal of this cash is set aside for the purposes of dividend payment (or in our case of accumulation units, dividend reinvestment). As this cash is now committed somewhere, unless it is reinvested back in to the fund immediately (as it was in the question's linked example), the value of the fund goes down.
However, the fund will probably still be getting dividends paid to it from its underlying shares, so even before the dividend date, the value of the fund will start going back up. This continues until the next ex-dividend date.
This means that if you buy in to the fund between two ex-dividend dates, you are paying extra because of the cash that the fund has got sitting around.

Technically speaking, this has already answered the question. The ex-dividend date matters because it has a clear effect on the price of the fund. However, there is a final loose end that we should clear up.
As this question points out, everyone benefits equally from the change in unit price when the dividends are reinvested. However, the funds recognise your overpayment and equalisation is the fancy name for how they compensate for this. On or very near the date of reinvestment, the amount that you are recorded as having paid for your investment will be revised down in proportion to how much you overpaid (i.e. your proximity to the upcoming ex-dividend date). In my experience, your unit number and price will not change when this happens and your account won't be credited either. It's always been a case of the fund saying "we recognise that you overpaid by x amount, so we've reinvested it back in to the fund. As you're invested with us, everybody wins". And that's the end of the story!
In summary:

Yes, everyone benefits equally (per share) from the dividend regardless of when they buy, as long as they buy before it is reinvested.
No, this does not mean that the ex-dividend date doesn't matter. The unit price of the fund will typically drop notably on it and you will overpay (albeit with some unusual compensation) if you buy in after it.

Aganju · Answer

Where did you get this impression?
Of course you get a dividend.
Typically four times a year, but some of them only annually, or twice a year, or monthly. For example VTI (https://investor.vanguard.com/etf/profile/distributions/vti):
Type    Distrib     Record     Ex-Div    Payable 
 Div    $0.69990   06/26/20   06/25/20   06/30/20 
 Div    $0.61360   03/27/20   03/26/20   03/31/20 
 Div    $0.88550   12/26/19   12/24/19   12/30/19 
 Div    $0.70000   09/17/19   09/16/19   09/19/19 
 Div    $0.54720   06/18/19   06/17/19   06/20/19 
 Div    $0.77200   03/26/19   03/25/19   03/28/19

Bob Baerker · Answer

I have no clue how dividends are handled in the UK.  Here's how they are handled in the US.  See my answer here.
If dividends are reinvested, they are of no consequence other than taxation if received in a non sheltered account and possibly a minor discrepancy in reinvested shares acquired because the Payable date is after the Ex=Dividend date (share price will likely be marginally higher or lower).

nanoman · Answer

The fund you linked is described as "accumulation units" and has a counterpart described as "income units". Most ETFs (in the US in particular) behave like income units. Accumulation units, which directly reinvest dividends as they are received from stock holdings and do not pay them out in cash, may be common in the UK but are likely obscure elsewhere.
I think you are correct that the ex-dividend date is not meaningful in this case. It may be listed for that fund by default based on the corresponding income units. See discussion here and here.

It seems that the only change that happens on the dividend date is that the unit price moves

It would not move in any outsized way; rather, the price moves every day by the moves in market prices of holdings, plus any dividends paid by those holdings, which would be a very small amount because only a small percentage of stocks pay dividends on any given day. Moreover, those dividends are offset on average by drops in the corresponding stock prices. In effect, the accumulation ETF price tracks a total return index.
It would not be feasible for the dividends to somehow accumulate "outside" until a fixed date (ex-dividend) and only then appear as an extra jump in the ETF price, because everyone would buy the ETF just before and sell it after. No risk-free "dividend capture" arbitrage is possible whether with accumulation units or income units.

OJFord · Answer

First of all, that's not an ETF (Exchange-Traded Fund) - it's an OEIC (Open-Ended Investment Company). (It's price reflects the underlying holdings, 'open-ended' means it can create and sell you 1000 units without moving the price, assuming the underlying prices don't move.)
You receive dividends from it, the OEIC, not (directly) the underlying - or you would have thousands of ex-div dates, not one.
However, you've linked to the 'Class C - Accumulation' variant, which means that income from the underlying will be reinvested, not distributed as income ('Other unit types available: Class C - Income') - it stays within the fund.
Ex-dividend date thus matters to 'Income' units in the same way as for any company, fund or not. 'Accumulation' units just remove the choice of what you do with your dividend: you buy more shares. Though since the only shares are 'inside' the fund, you're not issued more units, but the units you have represent a claim on more shares of the underlying.
Regarding your updated questions:

You don't actually receive a dividend (with Acc. units) so you have nothing to report even if it exceeded the allowance.
That is interesting/a slightly odd way to word it, but I believe it's just saying that is the value that would be paid out, and the value that will be reinvested. Note that it describes a 'distribution'; not a 'dividend'.
The dates aren't meaningless, because something's really happening: 'Income' units don't sell shares to give you income, it comes from cash; 'Accumulation' units instead use that cash to buy more shares.

If you never see the dividend for a fund, why does the ex-dividend date matter?

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