In order to generate $10,000 in Net Operating Profit After Tax (NOPAT) through a rental property, you must own a $50,000 property with an unheard of 20% net rental yield, a $100,000 property with a rare 10% net rental yield, or a more realistic $200,000 property with a 5% net rental yield. When I say net rental yield, I’m talking about rental income minus all expenses, including a mortgage, operating expenses, insurance, and property taxes.
1. The batting cage idea is very risky. I’ve seen many of them close over the years and it is not anything close to passive income if you want to keep the business going. You have to continually promote it and target youth leagues, coaches, schools etc to catch all of the new players who grow up and want to play. I’ve played at probably 8 batting cages over the years and 7 of them closed.

The age old argument of total return versus income has been, incorrectly imo, categorized as an either or proposition. We are going to do both. Right now I have a lot cash in an on line money market. I also have investments in 2 passive Index funds in a taxable account. We then have substantial 401ks/IRA’s which we won’t touch for at least 10 years. My wife will continue to max out her sep and we will continue to invest in the index funds although with a smaller amount. We have already factored that in. I looked at how to cut into the monthly deficit. Here is what I observed.

There is also an idea that we should work to build a passive income asset and then sit on the beach relaxing for the rest of our lives. The truth is that most people would get extremely bored with this scenario and will be eager to find something to do. That’s why the world’s billionaires continue to work… they love what they do and it stopped being about the money a long time ago.
But first, let’s about talk passive income! What is passive income? There are many different definitions out there, but mine goes something like this: Passive income is all about building online businesses that can work for you, that allow you to generate income, and grow and scale, without a real-time presence. In other words, you don’t trade time for money. You build something up front that can continue to work for you over time.

If you can max out your 401k or max out your IRA and then save an additional 20%+ of your after-tax, after-retirement contribution, good things really start to happen. If one is looking for earlier financial independence, such as retiring in their 40s or early 50s, it may be a good idea to skew towards more after-tax savings and investments given one has to wait until 59.5 to withdraw from their 401k or IRA penalty-free.

I am 30 years old and am retired. Previously, I made a modest salary as an Army officer. I own three duplexes and a quadplex in central Texas (10 rental units in all), and each of the properties provide me with net rental yields in excess of 15%. The last deal is actually an infinite return as my partner paid the down payment in return for a 50/50 split on a property that would otherwise provide a net rental yield of 18%. The above net rental yields also factor in an excellent property management team who manages my properties while I pursue other investment opportunities. To date, I have never interacted with any of my tenants nor have I ever had to personally deal with any maintenance issues.
Nowadays, anyone can create and sell t-shirts online, even with minimal design skill and coding knowledge. You can create designs on t-shirt marketplaces that do it all for you, upload designs to print-on-demand vendors who dropship orders for you, or set up an online store and sell tees you print and ship yourself, which can be the most profitable option.
Mike, I don’t consider the income from FS to be passive, as I’m spending time commenting to you right now. But since 75% of my traffic comes from search, the most traffic I would probably lose is 25% for probably a year. And then my search word rankings would probably slowly fade given frequency of posting new content is one of the search algo variables.
All that being said, the residual income valuation approach is a viable and increasingly popular method of valuation and can be implemented rather easily by even novice investors. When used alongside the other popular valuation approaches, residual income valuation can give you a clearer estimate of what the true intrinsic value of a firm may be. (Don't be overwhelmed by the many valuation techniques out there - knowing a few characteristics about a company will help you pick the best one. See How To Choose The Best Stock Valuation Method.)
I’m a 45 year old business owner who also has focussed on diversifying my income streams. I have a short term vacation rental in Florida that I bought for $390k in 2012 and net rental income for the last three years has been growing steadily. 2015 I am at $70k gross right now but should end up at $80-85k with net around $45k plus we use the place about 35 nights a year.
Of course, there are large fast-food, pet store, and other enterprises that cost a great deal. However, consider a DVD rental machine, soda, or gum ball machines as more passive avenues to income. These require little maintenance, coins, bills, or revenue collected via credit cards, as well as periodic refilling of machines.  These machines are, perhaps, one of the more lucrative paths to a passive income with little input from you.
I have a total of three CDs left. There is no way in hell I’m selling them after holding them for 4+ years so far to take the penalty. The CDs are for 7 years. That would be completely counterproductive. As a result, I feel very stuck with ever getting my CD money back if I wanted to. If the CDs were for just 1 or 2 years, I agree, it doesn’t matter as much. But combine a 7 year term with 4%+ interest is too painful to give up.
Residual income is when you continue to get paid after the work is done. This includes royalties from books, movies, or songs and also income that comes from real estate or business investments where you don’t actually have to be present to earn it. For example, Bill Gates is still making a residual income from Microsoft even though he isn’t working there anymore.