Hi there. Are you resident in the UK for tax purposes? Are your funds in the UK?
In the UK, interest is taxed as income (but with a tax-free allowance), dividends are taxed separately (with a different tax-free allowance), and capital gains are taxed as capital gains (with a hefty tax-free allowance). Anything in an ISA is free of tax.
Between a couple you could withdraw 4% without paying any tax if you structure it right.