That's why I'm a huge advocate of always starting a side business while working full-time, so that you can test your way into your new product or service, get feedback, validate the business idea, and start generating income before you quit your job. If you can master the art of scaling a side business idea while keeping your day job, you'll have no trouble succeeding once you're fully self-employed.
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 consultant.
It’s very important to set boundaries with your clients in order to maintain your schedule. For instance, if you only want to work one day a weekend so that you can spend the other with your family, be prepared to lose some business when you don’t cater to the more demanding clients. With a set goal in mind, it will be easier to stick to your guns and not compromise your other priorities. Remember, if you know where you’re going before you start, you’ll have a much easier time getting there.
Pet photography, like many other types of photography, can be done on one’s own schedule. You will have to be flexible in order to work with clients and find times that work for both parties, but you can pretty much set your own availability in a pet photography business. Best of all, there aren’t many ongoing expenses, so you could run a pet photography business from your home without very much upfront investment.
I recently met a woman who earned quite a bit of money as a very part-time chef. Once a week, she would go to someone’s house and prepare a homemade meal for their family, then do all the dishes and cleanup work. This gives the family plenty of together time, while putting some cash in the woman’s pocket. If you love to cook, this can be a great opportunity, but you may have to put a lot of effort into searching for clients.
How can you avoid that? Start a side hustle you can fund through savings -- or better yet, that you don't need to fund. Provide a service that only requires the tools you already have. Sell products you either make or can procure by consignment. Prove to yourself that there is a market -- and that you can serve that market -- before you take on any debt.
However, it is when I tried to get some hard info out of it that I ran into trouble. For example, the one website that was recommended for doing little IT jobs on the side turned out to be a depressing place where people desperately bid for jobs for extremely little money ("$12 if you configure my email software"). Also, the tax chapter didn't seem to really belong: I had to read it multiple times and still couldn't figure out whether I'd have to pay self- employment tax as a day trader or be subject to schedule C, etc...
If you don’t mind parading yourself around in public places as a side business idea, and enjoy a little attention, then working as a human billboard can pay a surprising amount of dividends. Renting out your beard, for example can earn you as much as $5 a day while having a brand logo tattooed on your shaven head for five years could pay as much as $7,000—though this type of earning opportunity is admittedly rare. This business idea is definitely not for the faint of heart, and is a little extreme for me, but nonetheless it's been done as a side hustle for many people. You can start by holding a placard or wearing a sandwich board. If you think this is a good side business idea, you can go all the way and turn it into a full on small business idea with enough hard work—plus you won't have to deal with all the issues other more complex businesses have to constantly think about (like reducing churn).

Nothing beats teaching more novice learners about your passion, hobby, or craft as a business idea (that's a common theme here). Explore dozens of DIY portals (such as DIY.org, DIY Network, Instructables and Mahalo) to get business ideas on how to earn a healthy side income just by showing others how to do the things you love. You can also sift through the countless ad-supported YouTube channels that teach just about anything from guitar strumming to 3D printing.
A proofreader reviews the written word in its various forms for clients and corrects for spelling, punctuation, and typos. To start a proofreading business, you must have a strong command of language usage, spelling, and punctuation. Depending on your clientele, you might be reviewing and correcting the language used in books, magazine articles, web content, ads, packaging, student assignments, or virtually any other vehicle of written communication.

If you’ve always wanted to publish your own book as a side business idea, there never been a better time than now. That’s because access to self-publishing tools and marketplaces has never been easier and more affordable. This eBook writer currently earns up to a couple of thousand bucks each month from six ebooks she published; while you can reportedly demand around $1000 per eBook project serving as a ghostwriter. My good friend, Caroline Beaton used freelance writing as her side business idea to eventually go from secretary to self-employed, while focusing on her own personal development and looking inward to discover what she's truly passionate about.

Successful ghostwriters must like to work in the background and have no interest in gaining popularity through writing. They need to be adaptable and flexible, both in their writing style and their work schedule. At the same time, ghostwriters require the self-discipline to remain on task and see a project through by delivering exactly what they promise.
It’s not on this list but Brand Ambassador/Promo work is another very flexible, fun, and lucrative side hustle! Basically you promote your favorite brands at awesome events (e.g. handing out Red Bull or demoing new products at high foot traffic areas). I created an entire resource website on how to succeed in this industry called “Brand Ambassador World”. It has everything from resume designs, to super helpful tips and tricks, to where to find promo gigs, to a comprehensive list of agencies, etc.
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