Credit Card Sign-Up Bonuses – This one might not seem like a source of income but ever since I discovered how lucrative churning credit cards can be I consider it part of my income. Just last year alone, I made over $10,000 tax free in travel, cash and gift cards from various sign-ups. It’s not as simple as just signing up for a card though, it requires a lot of research and some maintenance every couple weeks.
I would throw in some caution here: if your spouse works at the same company, or in the same industry as you, you are not diversified, and should something happen, you could be in a world of hurt.  Companies do go out of business, companies do lay employees off.  There is nothing wrong with working together, but realize that you are not diversified and you should be trying to maximize other income streams as a result.
For those willing to take on the task of managing a property, real estate can be a powerful semi-passive income stream due to the combination of rental and principal value appreciation. But to generate passive income from real estate, you either have to rent out a room in your house, rent out your entire house and rent elsewhere (seems counterproductive), or buy a rental property. It’s important to realize that owning your primary residence means you are neutral the real estate market. Renting means you are short the real estate market, and only after buying two or more properties are you actually long real estate.
Investing in rental properties: Another form of real estate investment, rental investments (i.e. becoming a landlord) could steer you down the passive income path of steady monthly rent checks that you can use to pay off a mortgage loan on the rental property. After the mortgage is paid off, those monthly checks go right into your bank account -- potentially for years to come. 
It’s obvious, but every successful product solves a problem or fills a need- if the problem must be solved quickly, even better. What’s an urgent need? How about a car repair when you’re stuck on the side of the road (‘had the transmission on my car give out on a highway exit ramp. I don’t recommend it). Another good example is heat or air conditioning repair at home.

  (3) The ratio between the deductions and the gross income is obtained through a U.S. personal income tax calculator [t] and reflect the 2005 income tax rates in the U.S. The federal income tax, social security tax, medicare tax, and state income tax are included. The deductions are taken as the average of the state of New York and the state of Arizona [t], and are representative of married without child status. The deductions on the average wage are confirmed through the average gross and net income of a household in the U.S.
India's mineral resources are vast.[274] However, its mining industry has declined – contributing 2.3% of its GDP in 2010 compared to 3% in 2000, and employed 2.9 million people – a decreasing percentage of its total labour. India is a net importer of many minerals including coal. India's mining sector decline is because of complex permit, regulatory and administrative procedures, inadequate infrastructure, shortage of capital resources, and slow adoption of environmentally sustainable technologies.[270][275]
Sonme months back, I heard the founder of Tastykhana.in in a TIE talk, where he shared that when they desperately needed some money in the starting years of their business, that time – one of the employee of an IT company put in Rs 1 lac in their business and within a year or two, he got back 20 lacs return through an exit option when they got funding later (it was something like this, if not exact)

Real Estate Income – Since we moved up to Newport Beach, I started renting out my condo in San Diego. My monthly cash on cash return is $300(I charge $1,900 for rent and my total payments including mortgage, HOA, property tax and insurance are $1,600) but I also get back around $350 every month in principal and about a $150 tax savings per month. But even this income is inconsistent, since sometimes expenses will pop up like last month when I had to buy a new A/C for $3,000!
India became the tenth-largest insurance market in the world in 2013, rising from 15th in 2011.[217][218] At a total market size of US$66.4 billion in 2013, it remains small compared to world's major economies, and the Indian insurance market accounts for 2% of the world's insurance business. India's life and non-life insurance industry has been growing at 20%, and double-digit growth is expected to continue through 2021.[219] The market retains about 360 million active life-insurance policies, the most in the world.[219] Of the 52 insurance companies in India, 24 are active in life-insurance business. The life-insurance industry is projected to increase at double-digit CAGR through 2019, reaching US$1 trillion annual notional values by 2021.[219]

All wages and any other compensation for services performed in the United States are generally considered to be from sources in the United States. The place, where the personal services are performed, generally determines the source of the personal service income, regardless of where the contract was made, or the place of payment, or the residence of the payer.
Jawaharlal Nehru, the first prime minister of India, along with the statistician Prasanta Chandra Mahalanobis, formulated and oversaw economic policy during the initial years of the country's independence. They expected favourable outcomes from their strategy, involving the rapid development of heavy industry by both public and private sectors, and based on direct and indirect state intervention, rather than the more extreme Soviet-style central command system.[124][125] The policy of concentrating simultaneously on capital- and technology-intensive heavy industry and subsidising manual, low-skill cottage industries was criticised by economist Milton Friedman, who thought it would waste capital and labour, and retard the development of small manufacturers.[126] The rate of growth of the Indian economy in the first three decades after independence was derisively referred to as the Hindu rate of growth by economists, because of the unfavourable comparison with growth rates in other Asian countries.[127][128]

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.
I’m looking at accepting a professor job. It’ll be more than a 50% pay cut. But I’ll have the same life you describe – endless summers and an entire month every winter to ski. I’m thinking in the end, eventually, I might even end up wealthier in more ways than one. Happy people tend to be the most successful. I have no desire to diversify. Dividend stocks allude me. CDs seem like a good choice for older people, but I have time on my hands and real estate knowledge, so I’m sticking with what I know, despite the fact that most people will tell me it is foolish and I should diversify.
The development of Indian security markets began with the launch of the Bombay Stock Exchange (BSE) in July 1875 and Ahmedabad Stock exchange in 1894. Since then, 22 other exchanges have traded in Indian cities. In 2014, India's stock exchange market became the 10th largest in the world by market capitalisation, just above those of South Korea and Australia.[402] India's two major stock exchanges, BSE and National Stock Exchange of India, had a market capitalisation of US$1.71 trillion and US$1.68 trillion as of February 2015, according to World Federation of Exchanges.[403][404]
In addition to opening a brokerage account, you can also invest in peer-to-peer lending firms like Lending Club. I’ve been using Lending Club for a few years, and my net annualized return was 6.02% percent last year. Picking the right investments is easy since the platform offers automatic investing, but you can also pick your own notes if you're brave and want to learn the best ways to leverage the Lending Club platform.
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