I early retired in 2007 and I have been paying 0% taxes since 2008. All of my income is interest, dividends, and capital gains. I do not draw any money out of my tax deferred accounts (I am still in my mid-40s). As long as my interest and unqualified dividends are under about $10,000, then the capital gains and qualified dividends are taxed at a 0% rate and so I owe nothing. This 0% tax rate on qualified dividends and capital gains expires this year.
Each year I sell some index funds and ETFs (and later rebuy them or buy a similar fund) in my taxable account so that I have gains up to the top of the 15% bracket, even though I don't need the money. So I am raising my tax basis for the future (so that my future capital gains will be smaller), effectively lowering my future income taxes.
As a single filer with an HSA contribution (which gives me a $3000 deduction), I create capital gains so that I make in total around $45000 per year on my 1040 form without paying income taxes. One does not hit the AMT doing this.
I live abroad and changed my residence to a 0% income tax state before making the move, just to make sure California would not get any ideas about taxing me. So I also pay no state income taxes.