Two kinds of dividends
Every dividend you receive is classified as either qualified or ordinary (non-qualified). This single distinction decides your rate. Qualified dividends are taxed at the preferential long-term capital-gains rates of 0%, 15% or 20%. Ordinary dividends are taxed at your regular income rate, up to 37%. Your 1099-DIV splits them out: box 1a is total ordinary dividends, box 1b is the qualified portion.
What makes a dividend qualified
To be qualified, a dividend must be paid by a U.S. corporation (or a qualifying foreign one) and you must have held the stock for more than 60 days during the 121-day window around the ex-dividend date. Most dividends from ordinary shares of established U.S. companies you hold as a long-term investor are qualified. Dividends from REITs, money-market funds, and some foreign entities are usually ordinary.
The rate difference is large
Because qualified dividends ride the long-term brackets, a taxpayer in the 0% band pays nothing on them, while the same dollar of ordinary dividend could be taxed at 22%, 32% or more. High earners add the 3.8% Net Investment Income Tax once modified AGI passes $200,000 (single) or $250,000 (married filing jointly), which applies to both kinds. Over a portfolio's life the qualified-vs-ordinary gap compounds into real money.
Where dividends are taxed differently
Dividends inside a traditional IRA or 401(k) are not taxed as received — tax is deferred until withdrawal, when everything comes out as ordinary income. Inside a Roth, qualified withdrawals are tax-free. In a taxable brokerage account, dividends are taxed in the year received whether or not you reinvest them — and reinvested dividends (DRIP) still add to your cost basis, which matters when you eventually sell.
Non-resident dividend withholding
If you are not a U.S. person, dividends are handled entirely differently: they are withheld at source, a flat 30% by default or a lower treaty rate (often 15%) if you file a W-8BEN. This is covered in our W-8BEN guide. For U.S. taxpayers, though, the qualified/ordinary split above is what matters.
A quick example
You receive $4,000 in dividends, of which $3,500 are qualified and $500 are ordinary. In the 15% long-term band, the qualified $3,500 is taxed at 15% ($525). The $500 ordinary portion is taxed at your income rate — at 32% that is $160. Had all $4,000 been ordinary, the tax would jump to about $1,280. Same cash, very different tax, driven entirely by the qualified classification.