You can set up a website, gradually build up the content (articles, videos, podcasts, etc.), then eventually monetize the site through advertising, affiliate marketing, or even the direct sale of specific products or services. Even better, you can generally find whatever services and technical assistance you need online and free of charge. Later on, when your site develops a reliable cash flow, you can begin working with paid providers who can take your blog to the next level.
The real estate market is on the rebound (for today) and people are buying and selling properties in many locations across the U.S. That means a lot of opportunities for professionals who know how to navigate the legal, financial, and commercial aspect of real estate to build up a stable of clients as a side business idea, especially if you begin to scale your sales hiring and build a team of reps working to help you close more deals. If you consider yourself an expert in the subject, it won't be a walk in the park (hehe), but you can earn significant additional side income as a home-based real estate consultant—especially if you employ one of the best CRMs for small business and know how to work magic over the phone.
Some businesses may be interested in adding other types of paid content to your website. This could include videos, podcasts, or any other material that would work with your site and help a business market itself. Always make sure that paid content isn’t too promotional. It needs to add value to your audience first and foremost, and not just present as an advert.
Offer to watch children or pets. If you know anyone who has children or pets, you could easily begin a side gig as a babysitter or pet sitter. To let people know you’re interested, send out a group email describing your services, post an ad on Facebook, or tell friends and acquaintances about your availability in person or over the phone. You can also create a profile on a babysitting referral site like Care.com.
Mechanical Turk operates much like TaskRabbit and GigWalk: it’s a corner online where Amazon gathers tasks to be done, people willing to do them, and people willing to pay for them. On Mechanical Turk, you get to do the oddest jobs you can imagine as an online business idea, made possible by a parallel online universe that runs on hits, visits, surveys, reviews, pins, likes, CPCs, reads, and other metrics. But don’t get too ambitious. The small sums being paid out to human Mechanical Turk users rarely add up to anything seriously substantial, even if you invest most of your spare time into it. It's a better opportunity for internationally-based people with internet access and lower costs of living than in the US. Here’s one person’s account of his former life as a Mechanical Turk talking through how he got started with  this business idea and what the experience was really like.
It shouldn’t come as a surprise, but people who regularly monitor their finances end up wealthier than those who don’t. When you were a kid, keeping track of all of your money in a porcelain piggy bank was pretty easy. As we get older, though, our money becomes spread out across things like car payments, mortgages, retirement funds, taxes, and other investments and debts. All of these things make keeping track of our money a lot more complicated.
Other steps in the process of forming a home-based business include selecting a legal structure, filing a fictitious name or "doing business as" statement, and obtaining any needed permits or licenses. The entrepreneur should also evaluate the risks associated with the business venture and make any necessary arrangements for health, life, liability, property, or business interruption insurance. Since it is sometimes difficult for a home-based business to be taken seriously by customers or creditors, it may be helpful to communicate a professional image through stationery and business cards, a separate phone line answered with a formal greeting, and distinct working hours.

Many people fancy themselves as designers. If you have a unique idea for a new product then it may be time to get it designed. This can be a long process involving prototypes, discussions with factories, package design, and much more. However, the profits once the product is on the market could be substantial. And remember, with Amazon FBA, your products can all be stored and shipped by Amazon, giving you time to think up your next invention. Learn more about Amazon FBA with my How To Start An Amazon FBA Business Guide.
Publishing is dead; long live the e-reader! Now that anyone can have their work e-published, it is possible for anyone to make a fortune off their writing. The biggest recent example is the 50 Shades of Grey trilogy, but there are many authors taking advantage of the ease of e-publishing. If you love to write and are willing to do your own promotion (and having a blog can really help in that case), writing an e-book is an excellent way to make money at home.
West.com: Be an “at-home-agent,” with an assortment of duties including working remotely as an IT specialist or obtaining, entering and verifying customer information, answering questions, resolving issues, explaining sales features or offering additional products or services. (Some users have reported being asked for their Social Security number when filling out the Work Opportunity Tax Credit [WOTC] info. However, filling out the WOTC is strictly voluntary — not required.)
As I’ve already covered with TeeSpring, the T-shirt retailing business is worth millions of dollars. But what if you want to do the manufacturing side of things? T-shirt printing turns out to be quite a rewarding business idea for many each year, but can quickly consume much of your side business idea time—so know what you're getting into before diving in. This multi-billion dollar industry counts big corporate factories as well as home-based part-time entrepreneurs.
Everyone (even kids and retirees) need to have some level of technical know-how to stay competitive and appreciate the marvels of the digital age. Just observe how learning sites like Codecademy, Treehouse, and Udacity continue to grow and you’ll understand the urgency of getting computer training for our generation (thus making it a great business idea to train others if you already have the skills). If you’re a techie, you can cash in on this need by offering lessons and tutorials within your neighborhood or across cyberspace through portals like YouTube or Udemy as a side business idea. You can even set up your own tutorial site with an interface for online payments.
Proz.com is a site where you can get paid to translate all kinds of documents, including files and even conversations. The site provides you with an opportunity to list your services as a translator. They offer opportunities in Spanish, German, Italian, Chinese, Arabic, Japanese and other languages, and specialize in legal, medical, technical and other fields.
Finally, when looking around for the right personal finance software that meets your needs, make sure that you’re comfortable with the program’s interface. It shouldn’t be expected that you recognize every single feature instantly, but if the features don’t seem readable and manageable to you, then you’re not as likely to use it and get the full benefits.
You can work as a virtual assistant through dedicated websites, such as Upwork or Zirtual. All kinds of skills are needed, and compensation can vary anywhere between $10 per hour to $100 or more. Obviously, the higher pay will be to people who have more technical skills, such as web building skills and marketing. But you can find work doing administrative tasks at the lower end of the pay scale.

Corrisa, thank you for adding your thoughts on Annie’s list. I wholeheartedly agree with your points to consider and would encourage anyone looking to join a network marketing-based business to do their due diligence before signing up. As I have found in my past ventures into home based businesses, the KEY to success is to treat your business as exactly that and not a hobby or trending fad.
Normally you’ll be asked to test a few websites by visiting them and to document and record your reactions and thoughts as you go through it. It’s really easy to get set up making extra money online by testing websites. All you need to do is sign up to the following services: UserTesting.com, Userlytics, TryMyUI, Userfeel, TestingTime (UK only), or Side Income Jobs.

A niche affiliate site often presents like an eCommerce store. To get started with an affiliate site, choose your niche then display products with pictures, descriptions, and prices, just as you would on an online store. However, when visitors click the ‘buy’ button, they will be taken directly to Amazon, to make the purchase. You then make an affiliate fee for sending the traffic to Amazon but have none of the packaging hassle, or initial financial output creating or buying the products.
Expertise is another matter, but remember that writing can take many forms—from resumes to news articles to marketing materials and even thank-you notes. (You can even write for businesstown.com, although that gig doesn’t pay … yet.) There’s probably some form of writing you’re qualified to do. Plus, if you’re good enough with grammar and punctuation, companies will pay you to be a freelance editor. One friend made good money editing posts on a popular travel site.
You can earn above average rates of return because peer-to-peer lending eliminates the bank function. That means that you participate in nearly the entire interest rate being paid by the borrower, rather than the less than 1% that you will typically earn on certificates of deposit. And you can reduce your risk by investing in slices of hundreds of different loans.
Video is growing like crazy. And more and more people are looking for professional help cutting their raw footage into viral-worthy content. If you have the right software and a bit of skill, you can easily make money online as a video editor. Check out these article of Fstoppers on how to become an online video editor and then look for relevant jobs on Mandy.com, Creative Cow Job Search, or ProductionHub.
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Please note that some of the links below are affiliate links and at no additional cost to you, I will earn a commission. Know that I only recommend products, tools and learning resources I've personally used and believe are genuinely helpful, not because of the small commissions I make if you decide to purchase them. Most of all, I would never advocate for buying something that you can't afford or that you're not yet ready to implement.
College counsellors come in all shapes and sizes. Their primary duty is to help guide students through an important period in their lives. Some counselors focus on admissions, career advice, financial aid, athletics, extracurricular activities, and other concerns. There are institutions looking out for part-time college counselors, making this a fantastic side business idea, or you can even start your own practice and charge anywhere from $25-$100+ per hour for your consultative services if you're well-versed on the subject.

Some subjects are much better paid than others, so although you may love the idea of writing about travel (badly paid) a better bet would be a niche like finance (much higher rates of pay). Check out the Pro Blogger job board for high paid freelance writing jobs – other places to look might be Textbroker or you can look at the “gigs” section on Craigslist.
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online. 
While the barriers to entry for a retail shop can be very high, one way to keep costs down and limit your time investment while you keep your full-time job, is to set up a weekend popup shop as a side business idea. More of whatever it is you’re selling—donuts, clothing, antique baseball cards, or anything else—will stay in your pockets instead of going to pay for operating expenses such as rent or utilities by choosing to pursue retail as a side business idea with a short-term rental. This guide from Shopify will give you a step-by-step process for getting your popup shop off the ground.
What’s the catch? None, really. Cash back apps act as affiliates for many online merchants, which means that whenever you make a purchase through one of the apps, they get a small commission — but then, they give you a portion of that commission as “cash back”. For example, if I buy a pair of Nike shoes through the Ebates app (or website) and spend $75, Ebates may get a $10 commission but then they’ll pass $7 back to me. It’s basically a way to get sale prices on stuff that isn’t on sale!
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