What it means
When a board declares a dividend it also fixes a cut-off, and the market sets an ex-dividend date a business day or so before the record date. Up to the day before that ex-date the shares trade cum dividend, so a buyer inherits the right to the declared cash.
From the ex-date onwards the shares trade ex dividend and the payment follows the seller instead. The distinction matters because it changes what your money is buying.
A cum dividend share carries the underlying business plus an almost certain cash payment, so it should reasonably be worth more than the same share stripped of that payment. In practice the price tends to fall by roughly the dividend on the ex-dividend morning, although ordinary market movement often disguises the adjustment.
Finance teams watch the dividend calendar so that share transfers, buybacks and employee plan awards settle on the side of the line they intend. Getting the timing wrong can hand a payment to a counterparty who was never meant to receive it.
Tax is where people come unstuck, because dividend income and capital gains are often taxed at different rates and sometimes in different years. Buying shortly before the ex-date purely to collect the cash, a habit known as dividend stripping, seldom pays once tax and dealing costs are counted.
The mirror term is ex dividend, and you will meet the same construction in cum rights and cum bonus for rights issues and bonus issues. Company announcements normally list the declaration date, ex-dividend date, record date and payment date, which together tell you exactly which side of the line a trade falls on.
In practice
Real-world examples
Example 1
A pension fund wants to sell 500,000 shares in a utility company and deliberately waits until after the ex-dividend date, so the fund still collects the declared $0.90 per share. The buyer pays a correspondingly lower price for shares that no longer carry the payment. Both sides get what they expected because the calendar was checked first.
Example 2
A private investor buys shares in a supermarket chain two days before the ex-dividend date and is surprised when the price drops the following week. Her broker explains that the fall matched the declared dividend almost exactly and that the cash will reach her account three weeks later.
Example 3
A corporate development team schedules completion of a small share purchase for the week before the ex-dividend date so that the acquiring company receives the payment. The purchase agreement states clearly that the shares transfer cum dividend, which removes any later argument about who was entitled to the cash.
Think of it
Buying a share cum-dividend is like buying a ticket to a concert that includes a voucher for free merchandise. You pay a slightly higher ticket price, but you get the valuable extra item included.
Formula
Calculation
Theoretical ex dividend price = Cum dividend price - Dividend per share
A listed engineering group declares a dividend of $1.20 per share while its shares trade at $48.00 cum dividend. The theoretical ex dividend price is $48.00 - $1.20 = $46.80. An investor buying 2,000 shares cum dividend pays 2,000 x $48.00 = $96,000. After the ex-date the holding is worth about 2,000 x $46.80 = $93,600, and the investor also collects 2,000 x $1.20 = $2,400 in cash. The two together come to $93,600 + $2,400 = $96,000, which shows that buying cum dividend does not create value by itself; it simply changes the form in which the value is held.Case study
Seen in the real world
Northgate Ceramics is an illustrative, entirely fictional listed manufacturer used here to show how the cum dividend window works in practice. In February its board declared a final dividend of $0.75 a share, with an ex-dividend date of 12 March and payment due on 4 April.
A family trust holding 400,000 shares had agreed to sell the whole stake to an institution, with completion originally pencilled in for 10 March. The trust's adviser pointed out that completing on that date would transfer the shares cum dividend, handing the buyer 400,000 x $0.75 = $300,000 of cash the trust had been counting on.
The two sides simply repriced rather than argued. Completion stayed on 10 March, the price was cut by $0.75 a share to reduce the consideration by $300,000, and both parties recorded the economic outcome they had originally expected with no dispute after the payment date.
Watch out
Common mistakes
- Assuming a cum dividend share is a bargain because a payment is coming, when the price already reflects the pending cash.
- Confusing the ex-dividend date with the record date, which is usually a business day or two later and is not the date that governs trading.
- Treating the ex-dividend price fall as a loss, when the shareholder has simply swapped part of the share value for cash.
Questions
People also ask
Does buying cum dividend guarantee the payment?
Yes, provided the trade is executed before the ex-dividend date and settles under the normal timetable.
Why does the price rarely fall by exactly the dividend?
Because tax treatment, ordinary supply and demand and general market movement all act on the price at the same time.
Is dividend stripping worth doing?
For most investors no, because the tax on the dividend and the dealing costs usually outweigh the small pricing gap.