What's crazy is that my book income is more than my SF condo-rental income. Yet I didn't have to come up with $1.2 million of capital (the minimum cost to buy my condo today) to create my book. All I needed to create my book was energy, effort, and creativity. I truly believe that developing your own online product is one of the best ways to make money.
Investing in a local business can be a risky proposition but one with good returns if you're able to do it successfully. Becoming a silent partner is great because you don't need to do any work – it can be less great if the business doesn't do well. Sometimes you can become a silent partner in a business because they need cash and are unable to get financing from the bank – this was common during the last recession. A perfectly good business with cash flow issues is the ideal target for this type of investment.
Leonardo da Vinci is another example of someone who was a "wide achiever," in the words of Roman Krznaric, author of "How to Find Fulfilling Work." Da Vinci was alternately a portraitist, an inventor, and a scientist. Krznaric says that in light of decreasing job security today, spreading yourself among several different jobs, as da Vinci did, is probably a smart thing to do.
* 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.
It covers Rental Income (Real Estate) or Interest Income (Bank Deposits). Though it is best suited for retirement planning but it can also act as second income during working years. Big question is how to fix the target for Second Income. Very simple, if your Monthly Expense is 50k & residential property can yield rent of 25k then you need 3 residential units i.e. one for self and two for second income source.
The book is not bad but it's not that great either. Think of it as an idea book in which you see him mention something and then research it futher. The rambling just becomes too much as you move along to the point where it becomes annoying to read. The tone the author uses is very nonchalant and he doesn't really explain anything. Ideas are just thrown out.
Here's an option that's still unfamiliar to many people but that has been growing in popularity: Lending money on a peer-to-peer basis. A major website for this is lendingclub.com, where investors have earned returns in the neighborhood of 4% or more annually. You'll be lending money to fellow individuals who have had trouble borrowing money through other avenues, and you can spread your dollars across many such folks to reduce the risk.
What I’m doing: My realistic goal is to have a blended annual return of 2x the risk free rate. With a current 5% hurdle, I am not paying down mortgages that cost less than 4%. Debt at 5% is a wash. My realistic blue sky scenario is a 3-4X rate of return over the risk free rate which can be achieved with property, stocks so far for the past five years, and certain private equity investments. Where I am dragging is my blended average CD interest rate of roughly 3% from an old CD coming due. I’ve rolled some money into a 12-month CD with CIT Bank at 2.5%. It’s the best rate I can find. 
Given the growth in the sharing economy, your junk can start to pay for itself. For example, if you have some awesome vintage furniture inherited from your grandmother sitting in a storage unit, you can rent this out to photographers for their “styled shoots” which are becoming all the rage. If your furniture is more modern but you still can’t bear to get rid of it – perhaps a home stager will be interested.
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.

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