You may not have all the expenses listed below, for example if the tenant pays utilities or if you manage the property yourself. This is just a list of common expenses. It is extremely important that you build out an estimate on your own before you purchase a property. Most of the information can be gotten by calling around or researching expenses in the area.

I will share what we did, because it’s an incredible success story. We used an existing tax loophole where if you sell your primary residence (after having lived there at least two years) you get to keep your profit tax-free. So, we stair-stepped. We bought house after house, at least two years apart, used the profit money to pay down on the next house (so on and so forth, yadda yadda) building up equity as we went along… and now, we own a $600,000 house debt-free. And now we are using our paid-off home as leverage to borrow money to buy commercial buildings to rent out. I like commercial because it’s a BUSINESS transaction… kids, pets, other wear and tear that you see with residential rentals is nonexistent. People take care of their business space much better than residential. You have to be in a good area for renting out commercial – a thriving business community – to make this work. But that’s how we “made it”, and though it took 15 years, we will have residual income to take care of us when we’re old enough to retire. People made fun of us for moving so much, but who’s laughing now? 😉 Oh, and our child only had to change schools once (and we wanted to anyway) because we stayed in the same general area as we moved around. We were careful not to disrupt his life too much.
Add Leverage (Mortgage) and you greatly increase the ROI especially from the perspective of using Rents (other peoples money) to pay down the mortgage and increase your equity in the property over time. At this point then yes price appreciation is secondary bonus and we have an arguement of how and why Real Estate can be better than Growth Stocks in some scenarios and for some investors.
Focus on your primary passive income stream first. It's difficult to grow your passive income into multiple streams if you don't already have one, solid stream. Focus all of your efforts on that one project first and help it grow as productive as possible. Then, you can take the money you've made and lessons you've learned from this passive income stream and put them into others.

If an investor puts $500,000 into a candy store with the agreement that the owners would pay the investor a percentage of earnings, that would be considered passive income as long as the investor does not participate in the operation of the business in any meaningful way other than placing the investment. The IRS states, however, that if the investor did help manage the company with the owners, the investor's income could be seen as active since the investor provided "material participation." 

The terms on private money loans can also vary from very short (a couple of months or even weeks) to years. Once the money is loaned to an investor the passive income will come in as long as the investor can meet their obligations. The work with private money lending comes in the beginning when choosing a private money lender and if the loan ever goes into default.

Although YouTube has been around for years, it is gaining in popularity as more people “cut the cord” on their cable TV service. There are plenty of people who are polished and have production quality that rivals many of the movies or TV shows that I watch. However, the vast majority are people just like you and me. Don’t be shy. Trust me, no matter what kind of content you publish, there are people way worse. And you will get better, just give it time.
Writing an e-book is very popular among bloggers, as many have noted that “it's just a bunch of blog posts put together!” You will not only have to make an investment of time and energy to create the e-book, but market it correctly. However, if marketed correctly (through blogging affiliates in your niche, for example), you could have residual sales that last a very long time.
When describing whatever it is your promoting, share your experience! If you can throw in some data or graphs to go along with it, even better. Back when I was more actively writing about eHow, I promoted an ebook that I read which helped quadruple my earnings per article. I created a graph that showed how much I earned before I read the book versus how much I earned after. To this date, that ebook has been one of the most successful affiliate promotions I’ve done on this blog.
The term affiliate marketing has taken a bad rap over the years, primarily because people are abusing just how easy this is to do. Internet marketers are finding products they don’t even use because they come with a sweet commission, and are spamming everyone until they either buy, or unsubscribe. This is also known as the dark side of affiliate marketing.
Do you want to rent commercial or residential properties? I started my professional career as a commercial RE agent before starting residential investing. Buying and renting out commercial space like office, industrial and retail will generally yield a lower return but will also involve far fewer headaches. The drawback to commercial space is that it costs much more to buy one property.

You know the fantasy: write some ebook (or better yet, hire freelancers in Mumbai to research and write it for you at $.20/word!) on some niche topic, set up AdWords and Facebook campaigns targeted to the right keywords (you can hire those Mumbai guys to do your keyword research too), put up a cheap landing page (with copy written by... guess who!), press "Go!" on the PPC campaign, and voilà. . . just wait for the money to roll in while you sleep!

A REIT is a company that owns, operates or finances real estate and allows anyone to invest in portfolios of real estate assets, the same way as stocks: you can purchase individual stock or exchange-traded fund (ETF). You can then earn a share of the income produced through the real estate investment without having to own, manage or finance a property.
Dividend Income: Dividend income is wonderful because it is completely passive and is taxed at only 15% if you are in the 25%, 28%, 33%, and 35% income tax bracket. If you are in the 39.6% income tax bracket you will pay a 20% tax on your dividends. My dividend income portfolio mainly consist of dividend equity and bond ETFs such as DVY, VYM, MUB, TLT, and IEF. Total stock and bond income is a little over $100,000 a year due to a heavy accumulation of stocks and municipal bonds after selling my house.
The idea behind cashback is simple: you get rewarded for purchasing or using products you plan to buy anyway. Cashback sites pay you when you click through them, go to retailers, and spend. For example, check out - There are over 2,000 stores to choose from including Walmart, Target, Sears, Calvin Klien, and others. You also get a $10 gift card after your first $25 purchase. Sign up is free. (If you encounter a cashback site where it’s not, avoid it.
* I use Personal Capital to track all my finances in one place. It’s much easier to use their free software to follow 28 accounts on one platform than to log into various accounts to check my balances. They’ve also got great tools for x-raying your portfolio for excessive fees, recommending a more optimized asset allocation, and planning for retirement with their Retirement Planner.