Understanding markets · Dividends
Ex-Dividend Date: Why Stocks Drop on the Ex-Day
The ex-dividend date is the first trading day on which a stock trades without the right to its next dividend. Anyone who buys on or after that day does not receive the payout. That is why the share price opens lower by roughly the dividend amount on the ex-date.
For shareholders this is not a loss: the value simply moves from the share price into cash. For options traders, though, the ex-date has real consequences, above all for short calls.
By Daniel Berg ·
Ex-date, record date, payment date: the four dates of a dividend
Every dividend comes with four dates. Mix them up and you buy a day too late or sell a day too early. The order never changes; only the gaps between them depend on the market.
- 01
Declaration date
The company announces the amount and the dates. In the US the board of directors usually declares the dividend; in Germany the annual general meeting votes on it.
- 02
Ex-dividend date
The first trading day without the dividend. What matters is that you bought the stock before this day, meaning on the previous trading day at the latest.
- 03
Record date
The day the company checks who is on its books. Because trades settle after the trade date, the ex-date is set so that only purchases made before it are settled in time.
- 04
Payment date
The dividend is paid out. For US stocks this is often a few weeks after the ex-date; in Germany usually a few business days after the general meeting.
| Market | Ex-date | Record date | Payment date |
|---|---|---|---|
| United States (since the move to T+1, May 2024) | usually the same day as the record date | set by the company | often a few weeks later |
| Germany | usually the business day after the general meeting | business day after the ex-date | typically the third business day after the general meeting |
A detail many older explainers still get wrong: in the US the ex-date used to fall one or two days before the record date. Since settlement was shortened to one day (T+1), the two normally fall on the same day. The rule of thumb is unchanged: you have to buy before the ex-date.
Frequency differs too. Many US companies pay quarterly, while many German companies pay once a year. An annual dividend therefore tends to mean a larger single price adjustment – and a more noticeable one for options positions.
Why the stock price drops on the ex-date
A dividend is cash the company pays out to its shareholders. Once it is paid, that cash is no longer on the balance sheet, so the company is worth that much less. At the same time, a buyer on the ex-date no longer receives the payment. No rational buyer would pay the same price on the ex-date as the day before, when the dividend was still attached.
The market reflects this by opening the stock lower by roughly the dividend on the ex-date. After that it trades like any other day: a strong market can cover the adjustment within hours, a weak one makes the drop look bigger. The adjustment is arithmetic, not a verdict on the business.
Worked example · illustrative, not market data
- Position value the day before (100 × $50)
- $5,000
- Theoretical opening price on the ex-date
- about $48
- Position value on the ex-date (100 × $48)
- $4,800
- Dividend receivable (100 × $2, before tax)
- $200
- Total wealth, before tax
- $5,000
Before tax, your wealth is unchanged; it has just moved from “shares” to “cash”. After tax it can even be slightly lower, because the dividend is taxed while the price drop does not immediately count for tax purposes.
Charts and returns
Many price charts show the adjustment as a gap. Performance comparisons should therefore use total return (price plus reinvested dividends). Germany’s DAX, for example, is a total-return index in which dividends are notionally reinvested; individual share prices are not.
What the ex-dividend date means for options
A common belief goes: the stock drops on the ex-date, so calls lose and puts gain. That is only half right. Known dividends are priced into options long before the ex-date arrives.
Dividends are already in the option price
Pricing models work with the expected stock price at expiration. If a dividend falls within the option’s life, that forward price is lower. Calls are therefore already a little cheaper and puts a little more expensive than they would be without the dividend. On the ex-date the premium does not automatically jump by the adjustment; it reacts to unexpected moves, as on any other day. Our guide how option prices work explains how intrinsic and extrinsic value make up the premium.
The contracts themselves are not adjusted for ordinary cash dividends either: strike and contract size stay the same. Adjustments are reserved for special cases such as unusually large special dividends, under rules set by the exchange or clearing house.
The real risk: early assignment of short calls
Most equity options in the US and on Eurex are American-style, so the holder may exercise at any time before expiration. Usually that makes no sense, because exercising throws away the remaining time value. Before an ex-date the maths changes: by exercising an in-the-money call, the holder owns the stock in time for the dividend. If the dividend is larger than the call’s remaining time value, exercising on the last trading day before the ex-date is the rational choice. For you as the seller, that means assignment.
Worked example · illustrative, not market data
- Intrinsic value of the call ($50 − $40)
- $10.00
- Assumed call price the day before the ex-date
- $10.10
- Remaining time value
- $0.10
- Dividend per share
- $1.00
- Holder’s gain from exercising
- about $0.90 per share
Instead of selling the call for $10.10, the holder exercises, buys the stock at $40 and collects the $1 dividend. They give up $0.10 of time value to gain $1. With 100 shares per contract that is roughly a $90 difference – enough for professional traders to exercise such calls systematically.
If the time value is larger than the dividend, for example on an at-the-money call with more time left, early exercise usually does not pay for the holder. That is not a guarantee, because not every holder acts rationally.
What an assignment actually triggers
Covered call
Your shares are called away at the strike before the dividend is paid. You keep the premium and the gain up to the strike, but miss the dividend you may have been counting on. More in our covered call guide.
Uncovered (naked) call
Without shares in the account, assignment leaves you short the stock. Anyone short on the record date owes the dividend to the lender of the shares. What looked like a small options position becomes a cash obligation plus open price risk.
Call spreads
If the short call of a spread is assigned and the long call is not exercised, the hedge is temporarily out of balance. If you do not exercise the long call yourself in time, you can owe the dividend and also carry price risk on the ex-date.
Puts
The effect is reversed for puts: the expected dividend makes them more valuable, and exercising a put early before the ex-date generally does not pay, because the holder would give up the dividend they could otherwise still collect.
In practice: handling ex-dividend dates as an options trader
- Know the dates: before every trade, check whether a dividend falls within the option’s life. The dates are in the company’s announcement and usually in your broker’s platform.
- Check in-the-money short calls: on the day before the ex-date, compare the time value of your short calls with the dividend. If the time value is smaller, expect assignment.
- Act in time: close or roll at-risk short calls before the close on the last day with dividend rights if you want to keep the shares or the dividend.
- Watch your spreads: with call spreads, only the short leg can be assigned. Decide whether to exercise the long call yourself or to close the position beforehand.
- Mind stop orders: a stop just below the price can be triggered by the dividend adjustment alone. Check how your broker treats open orders around the ex-date.
- Plan for tax: dividends are taxable income, and foreign shares can carry withholding tax. For German investors our guide to taxes on options and investment income gives an overview.
Three common myths about ex-dividend dates
Myth 1: “I lose money on the ex-date.”
The price adjustment matches the dividend you receive. Before tax your wealth is unchanged. Looking only at the price chart shows a loss that is not one.
Myth 2: “Dividend capture is free money.”
The idea: buy just before the ex-date, collect the dividend, sell right after. Because the price falls by about the dividend, nothing is left on average – after commissions, spread and tax on the dividend, usually less than nothing. Selling a call to cushion the drop adds exactly the assignment risk described above.
Myth 3: “Buying puts before the ex-date is a sure win.”
Because the adjustment is known, it is already in the put price. A put only gains if the stock falls further than the market expected. That is an ordinary bet on direction, not arbitrage.
Frequently asked questions
When do I have to buy a stock to get the dividend?
No later than the trading day before the ex-dividend date. If you buy on the ex-date or later, you are not entitled to the upcoming dividend. You may sell on the ex-date itself and still receive the payment.
Does the stock always fall by exactly the dividend?
In theory it opens lower by about the dividend amount. During the day, news, sentiment and supply and demand overlay that effect, so the closing price can be higher or lower than the adjustment alone would suggest.
What is the difference between the ex-dividend date and the record date?
The ex-date is the first trading day without the dividend; the record date is when the company determines its shareholders. In the US the two usually fall on the same day since the move to T+1 settlement in May 2024. In Germany the record date is usually one business day after the ex-date.
Are options adjusted for dividends?
Not for ordinary cash dividends. Strike and contract size stay the same because expected dividends are already reflected in option prices. Only special cases such as unusually large special dividends can lead the exchange or clearing house to adjust contracts under its rules.
Can my covered call be assigned before the ex-dividend date?
Yes, if the call is in the money and its remaining time value is smaller than the dividend. Then exercising on the last day before the ex-date pays for the holder. Your shares are sold at the strike and you do not receive the dividend. To avoid that, close or roll the call in time.
Does the dividend capture strategy work?
Not reliably. The stock typically drops by roughly the dividend on the ex-date, so the gain from the payout is offset by the price adjustment. Commissions, bid-ask spreads and tax on the dividend usually leave the strategy with a small loss on average.
Why do puts not jump in value on the ex-date?
Because the dividend was known in advance. Option pricing already uses a forward price that is reduced by expected dividends, so puts were priced higher all along. On the ex-date, puts react only to price moves the market did not expect.
Sources and context
All figures in the worked examples are round, fictional teaching values, not prices of real stocks. Dates and procedures follow the primary sources below. This guide is educational and is not investment or tax advice.
Keep building your understanding
Understand exercise & assignment
What exactly happens when an option is exercised.
Manage covered calls properly
Collect premium without being surprised by assignment.
How option prices work
Intrinsic value, time value and why dividends are priced in.
Taxes on investment income
Flat-rate tax, allowances and loss offsetting in Germany.