OK, to be honest, I am now confused by the new tax rules. I found this below, but my understanding was that dividends were always 28%, while capital gains could be lower....but I'm wrong...perhaps?
Nonqualified dividends (also called ordinary dividends) are taxed at the regular federal income tax rate. Qualified dividends get the benefit of lower dividend tax rates because the IRS taxes them as capital gains.
The taxes on dividends, is, like other stuff, more complicated than a "simple" 15 percent. Its explained here: https://smartasset.com/taxes/dividend-tax-rate Since Im unaware of your income, I would not venture a guess.
However, the obvious answer is if you are concerned about taxes, why not put it in your IRA account, where it can grow (untaxed) until you withdraw your money at, a minimum age of 59.5, while you must withdraw and be taxed beginning at age 70.5. (That has been changed tho, and you can wait a year or two to take it out)