"But here’s the corporate math. Every $1 of capital gains that a corporation realizes carries with it 35 cents of federal income tax (and often state income tax as well). The tax on dividends received from domestic corporations, however, is consistently lower, though rates vary depending on the status of the recipient. 20 For a non-insurance company – which describes Berkshire Hathaway, the parent – the federal tax rate is effectively 10 1⁄2 cents per $1 of dividends received.
Furthermore, a non-insurance company that owns more than 20% of an investee owes taxes of only 7 cents per $1 of dividends. That rate applies, for example, to the substantial dividends we receive from our 27% ownership of Kraft Heinz, all of it held by the parent company. (The rationale for the low corporate taxes on dividends is that the dividend-paying investee has already paid its own corporate tax on the earnings being distributed.) Berkshire’s insurance subsidiaries pay a tax rate on dividends that is somewhat higher than that applying to non-insurance companies, though the rate is still well below the 35% hitting capital gains. Property/casualty companies owe about 14% in taxes on most dividends they receive. Their tax rate falls, though, to about 11% if they own more than 20% of a U.S.-based investee. And that’s our tax lesson for today"
So taxes on dividends (to a corporation) are anywhere between 7%-10.5% (non-insurance) to 11%-14% (insurance). So they are already pretty low.
On common stocks, BRK got to pay 35% everytime they dump a stock. If they have been holding a stock forever (like Coke) the size of the tax is huge. In that case its better (math wise) to hold and receive dividends WHILE WAITING for tax rates to come down, even if the stock is a little overvalued, you don't like it as much, etc. The reason is that because the tax is so huge (35%) to have almost 1/3 of your capital to dissapear like that is a huge burden. Its better to hold something a little overvalued (but not massively so) and GAMBLE that rates will come down. Because if they do, you produce an extra 10-20% of capital in savings. That's a form of 'return'.
When tax rates change, you go ahead and dump everything that is marginal like that and use the proceeds to either reinvest into something else or keep in cash while waiting for a huge purchase. And that's what he will do