#1 Look into in Tax-efficient Investments
As a retiree, your investments will provide your other source of income in the form of interest, dividends and capital gains. Keep in mind that these returns on investments have distinct treatments where the taxman is concerned, such as capital gains and dividends being taxed with lower rates than ordinary income and interest earned on bonds being taxed as income except in municipal bonds.
Thus, you should choose tax-free or tax-efficient investments that can provide maximum income on minimum taxes.
#2 Use Tax-advantage accounts
You should invest in as many different retirement accounts as possible so that you can enjoy more flexibility in both income earned and taxes paid. For example, look into the Roth option as well as the traditional IRAs with your accountant so that you can get the best bang for your buck in retirement accounts.