The PPACA Medicare tax is a dangerous tax IMHO. It is an entirely new kind of tax. It is small and in jeopardy of going away but I predict it won’t. If it goes away it won’t be for long and it will grow over time – like most taxes. 3.8% is a starting point. This one has the added political appeal of “taxing the rich” and “unearned income” that makes it more palatable to the electorate.
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Depending on the level of AAII otherwise earned in a particular year, you may wish to consider investments that lean towards growth rather than annual interest or dividend income, as you may better be able to time the recognition of a capital gain. In addition, since capital gains are only 50 per cent taxable, it would take $100,000 of realized capital gains to generate $50,000 of passive income that is counted towards the AAII test.

When withdrawing money to live on, I don’t care how many stock shares I own or what the dividends are – I care about how much MONEY I’m able to safely withdraw from my total portfolio without running out before I die. A lot of academics have analyzed total market returns based on indices and done Monte Carlo simulations of portfolios with various asset allocations, and have come up with percentages that you can have reasonable statistical confidence of being safe.
One of the latest trends is crowdfunding / syndications where money is pooled together to directly invest in various real estate properties.  You do not get quite the variety and diversification you would in a REIT but it provides an opportunity to invest a smaller amount of money than purchasing a property directly.  Usually, you are a limited partner in a partnership.  Since you are not materially involved in the day to day activities, the income generated is passive income.

Another great aspect of passive income is that it is often completely scalable. Consider my book. If I sell 10 copies of it, I might get $100. If I sell 100 copies of it, I might get $1000. How much additional work did it take for me to sell those extra 90 books? Zero. And there’s nothing keeping me from selling 1,000 or even 10,000 copies of the book. A website is the same way. No limit on the eyeballs that can view it (as long as I keep upgrading the hosting plan!) Shares of stock are the same way. Owning 100,000 shares is no more work than owning 10 shares. If you’re a real estate investor, once you get your “system” in place (agent, insurance guy, attorney, accountant, property manager, repairman etc) it may not take you much more work at all to own ten properties than to own one. Maybe you do speaking gigs and charge $50 a head. Is it any more work to speak to 500 instead of 50? Not really. Leveraging your money is great, but leveraging your time through scalability is even better.
Try going to our post: 20 Sites That Will Pay You to Read Books: Even though editing is not what this post is about, there are several companies that might do book editing such as Kirkus: I hope this helps and good luck on your book!