I've been observing for a while that many investors completely ignore dividends when building their portfolios, and honestly, they miss out on an important part of the equation. It's not just about buying stocks that go up in price; there's a whole world of passive income that most leave on the table.

Basically, a dividend is what a company gives you as a shareholder for having invested your money in it. It's their way of saying thank you and, at the same time, attracting more capital. Companies distribute a portion of their profits among those who own shares. It sounds simple, but there's much more behind it.

Here's where it gets interesting: not all companies treat dividends the same way. Growth companies, typically tech or biotech, prefer to reinvest everything to expand. That's why you see them paying little or nothing. In contrast, established companies, in sectors like utilities, energy, or basic consumer goods, are the ones that really distribute money. Those are the ones building long-term wealth.

One thing that surprised me when I started trading was discovering that even with CFDs you receive dividends. Contracts for difference replicate the dividend policy of the underlying stock. Of course, you don't have voting rights at the meetings, but honestly, most retail investors don't need that either.

Now, here’s the point many forget: the ex-dividend date. This is a critical concept that can cost you money if you don’t understand it well. The ex-dividend date is the cutoff day that determines who gets paid and who doesn’t. If you sell your shares before that date, the money is yours. If you buy after, you miss out on that payment, even if you're a shareholder. A quick example: imagine Banco Santander announces a dividend of €0.80 per share for April 8, with an ex-dividend date of April 6. If you sell on the 6th, you get paid. If you buy on the 6th, you don’t. It’s that simple but crucial.

There are several related dates you should know. The record date is when it’s determined who has the right, and the payment date is when the money actually arrives. In international markets, you'll hear about ex date, last trading date, and payment date. It’s the same thing, just with different names.

Calculating dividends is quite straightforward. You need the dividend per share (DPS) and then the dividend yield. The DPS formula is total profit multiplied by the payout percentage, divided by the number of shares outstanding. Then, to find the yield, divide the DPS by the current stock price. Let’s look at a real case: if a company earns €10 million, decides to distribute 80% as dividends, and has 340 million shares outstanding, the DPS is €0.0235. If the stock trades at €1.50, the yield is approximately 1.56 percent.

There are several types of dividends worth knowing. The ordinary dividend is paid based on forecasts during the year. The supplementary adjusts to final results. There are extraordinary dividends due to specific events like asset sales. There’s also the script dividend, where you choose whether you want cash, new shares, or a mix. And there’s the fixed dividend, the classic form in euros or whatever currency.

Don’t confuse dividends with coupons. Dividends are from equities, stocks. Coupons are from fixed income, bonds. With dividends, you’re a shareholder; with coupons, you’re a bondholder. Dividends have no predefined maturity date; they are determined year by year. Coupons do have fixed dates and capital repayment at the end. They are completely different concepts, even though both are cash flows in your favor.

If you look at companies that really take dividends seriously, you have the Dividend Aristocrats. They are companies in the S&P 500 that have been paying and increasing dividends for 25 years or more. Coca-Cola and P&G are veterans on that list. There are about 65 companies in that exclusive club. They are benchmarks because they demonstrate stability and commitment to shareholders.

Building a dividend strategy requires discipline. It’s not about chasing quick gains but about slow and steady growth. You should look for companies with a consistent history of increasing payouts. Preferably in defensive sectors: utilities, basic consumer goods, energy. Look for a low P/E ratio within their sector, not compared to others. If possible, reinvest the dividends to take advantage of compound interest. Avoid highly leveraged companies because an interest rate hike could jeopardize dividend payments. And even if you’re a buy-and-hold investor, regularly monitor financial statements.

The reality is that dividends are more important than many think. They are not only passive income but also influence stock prices. Good news about dividends increases value, bad news penalizes. Even on the payment day, you typically see a price drop proportional to the dividend paid out. Understanding the ex-dividend date, how to calculate dividends, what types exist, is essential if you want to operate seriously. Whether you’re building a dividend-focused portfolio or just doing buy and hold, these concepts are fundamental knowledge for any serious investor.