Real Estate: I currently own one rental property in San Francisco which I bought in 2003 (2/2 condo), one vacation rental in Squaw Valley, Lake Tahoe (2/2 condo), and my primary residence. Real estate is my favorite asset class to build wealth because it is easy to understand, tangible, provides utility, and rides the way of inflation. I recommend individuals try and get neutral inflation by buying their primary residence as young as possible. The power of inflation is just too hard to counteract.
Thanks for the great article…although I have to point out many of the items listed are not passive but active, such as selling bodily fluids, writing blogs or resumes, and collecting bottles and cans. To be truly passive, the income source must require no effort on your part (after initial setup). Real estate, dividends, P2P lending…these are truly passive income sources.

If you have a blog or other type of site, you can build affiliate links to different services on the website. Many people use Amazon as an affiliate partner. For example, if you are a beauty blogger writing about different products, you can set up Amazon affiliate links on your blog so that whenever someone buys the product you mention on Amazon, you receive a percentage of the sale. Amazon is not the only affiliate partner out there. Here is good, in-depth information on affiliate marketing. 
Reality One: We live in a competitive and fast changing world. Business has become highly specialized and niched because knowledge is growing exponentially, requiring specialized skills to employ it properly. Successfully competing in many widely varying fields is contradictory to the specialization and complexity required by our current business climate.

I make some income from Retire by 40. Right now, all of the income is from advertising. If you’re curious about my online income, you can sign up for our monthly newsletter and see the break down. I’m not exactly sure how I would categorize my online income, though. If I stop blogging, the income will continue, but I’m sure it would decrease over time. I guess blogging income is 50% active and 50% passive at this point.
Passive income differs from active income which is defined as any earned income including all the taxable income and wages the earner get from working. Linear active income refers to one constantly needed to stay active to maintain the stream of income, and once an individual chooses to stop working the income will also stop, examples of active income include wages, self-employment income, martial participation in s corp, partnership.[4] portfolio income is derived from investments and includes capital gains, interest, dividends, and royalties.[5]
State and local tax refunds — You might have received a refund of your state or local income tax you claimed as an itemized deduction on your prior-year return. If so, usually a portion of your state or local income tax refund is taxable. However, even if you itemized, part of the refund could be tax-free. To learn more, see the State and Local Income Tax Refunds tax tip.
The theoretical generalization to more than one period is a multi-period wealth and income constraint. For example, the same person can gain more productive skills or acquire more productive income-earning assets to earn a higher income. In the multi-period case, something might also happen to the economy beyond the control of the individual to reduce (or increase) the flow of income. Changing measured income and its relation to consumption over time might be modeled accordingly, such as in the permanent income hypothesis.
Since I knew I’d eventually be losing my day job income, I had to set realistic goals. There was no way I was going to make a six figure salary blogging and working online after only 2 years but I thought it might be possible to cover our monthly expenses for a few months while I took time off and looked for a new job. I already had some secondary sources of income and there were others that I specifically tried to build up.

My suggestion is to move and rent out your old home. It’s a good way to start if you’re ready to move anyway. If you don’t want to move, then I don’t know. 🙂 Maybe just keep an eye out for a good deal. It’s great that you have income from other sources. They are small now, but I’m sure you can grow them if you put more time into them. It’s a good experience.
Ebooks are one of my favorite sources of passive income. Now, you can do this the simple way and just publish it on Amazon's KDP. Or, you can go all out and build yourself a book funnel. Book funnels are powerful, but they won't be fully passive. For example, if you do a free-plus-shipping offer for your ebook (converting it into a physical book), you'll need to create some one-time offers (i.e. extra training) and up-sells (i.e. an audiobook). But, a book funnel can be very powerful.
Infectious diseases continue to blight the lives of the poor across the world. An estimated 40 million people are living with HIV/AIDS, with 3 million deaths in 2004. Every year there are 350–500 million cases of malaria, with 1 million fatalities: Africa accounts for 90 percent of malarial deaths and African children account for over 80 percent of malaria victims worldwide.Source 9
The launch of the Expressway Development Support Project (EDSP) marked a historic moment in the WBG’s partnership with Ethiopia, as it is the first project co-financed with China EXIM Bank and South Korea EXIM Bank. The project brings together traditional and non-traditional development partners to work on a single project, with standardized design, safeguards, and joint-supervision.
* Freelance writing: Quality freelance writing takes tremendous effort. Ironically, the better the quality of your writing, the more you don’t want to freelance and just keep the articles for your own site. Freelancing is a great way to earn side income, however, it’s not really for me. I’ll probably take on one or two freelance jobs maximum per year and write no more than four articles a month elsewhere.
If you’re worried about launching a new product, and think you might need some feedback to make it really good, Flynn recommends “pre-selling” an idea — for instance, offering a limited number of spots or seats into, say, a course you create and giving the test group specialized attention so you can see how to improve the content. Once it’s revised (or, if it’s software, once all the bugs are removed), you could open it up to your whole audience.
Which all goes back to my point – since companies change in a lot of unpredictable ways, it makes more sense for passive income to just ride the market by investing in a Total Domestic Stock Market, Total Bond Market, and Total International index funds, with allocations that depend on your goals and time horizon. For income, withdraw 4% or less, depending on what research you believe, and you’ve got a pretty low risk strategy.
Part of providing value is building trust. Don’t link to things that aren’t of good quality or people won’t trust your recommendations. The other part of making an audience is consistency. It matters less how often you post than how consistently. If you only have time to do one post a month, that post should come out on the same date and time each month.
Right now we have five, but we’ll probably cut that down to four at ER next year. Current: W-2, business income, rental income, interest on personal loan plus accounts, dividends and cap gains. Future: subtract W-2 for the most part, not counting little “fun work” projects. If we were looking to live the high life, we might aim for the millionaire’s seven sources, but we feel like our four sources will let us live very comfortably with plenty of contingency plans in place. 🙂

Making legitimate passive income isn’t as difficult as you might think. Some of the best passive income ideas might take a little time to set up but can start cash flowing within a couple of months and will provide a consistent monthly income for years or more. The most important point is just to get started. You make exactly $0 on the passive income sources you never start.
Thanks for asking. https://passiveincomemd.com/what-is-passive-income/ gives a good summary of the definition I use. But in brief, it’s income that isn’t proportional to the time you physically put into acquiring it. It doesn’t mean it’s not without work or effort. It’s just that most of the work is done up front and it continues to pay off long after that initial effort. Real estate fits into that box. There’s definitely a spectrum but compared to what we do as doctors, where our compensation is directly linked to our time, most of these things are quite passive.
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Almost all of these ideas require starting a personal blog or website. But the great thing about that is that it's incredibly cheap to do. We recommend using Bluehost to get started. You get a free domain name and hosting starts at just $2.95 per month - a deal that you won't find many other places online! You can afford that to start building a passive income stream.
I agree mostly with the real estate advice. I’m looking for ways to take advantage of the condo I own to get up the rent from ~$0.90/ft to the $1.2-1.5/ft that seems more like the range in the same area. I’d have to put in a bit of capital (probably 10k on the low end for just the basics up to 40k if I wanted to remodel the kitchen and 2 bathrooms up to par with the area), so the return is likely there if those upgrades warrant $1.30/ft (given the unit is larger than most 2br/2ba in the area).
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Wages received for services rendered inside the territorial limits of the United States, as well as wages of an alien seaman earned on a voyage along the coast of the United States, are regarded as from sources in the United States. Wages or salaries for personal services performed in a mine or on an oil or gas well located or being developed on the continental shelf of the United States are treated as from sources in the United States.
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