Wow! What an awesome list! My favorite is the stock photography because I love photography. I have had some success there, particularly with one photo I make some decent income from. I think the key with stock photography is finding a shot that is high demand. Then, find a new unique way to frame that shot. This is the reason my St. Louis Arch photo is a top 10 on both ShutterStock and iStockPhoto. Thanks for the awesome ideas above!
People are turning to audio and visuals when it comes to technical subjects. However, you should consider doing an ebook first and turning it into an audiobook through a resource like Audible's ACX platform. You can hire a producer either through a royalty share program, so you don't have to shell out upfront cash, or you can do a pay-per-hour hire as well.

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.

Driving for Uber and Lyft are popular ways to make extra money in a month when you need it. You'll use your personal automobile to chauffeur riders around your city in return for a percentage of the fare. Remember that driving for a ride-hailing app can have tax consequences, so you should track expenses and earnings and report them appropriately at tax time.
Even if it’s a mundane task like walking dogs, you could start the next (or only) full-service dog walking and grooming service in your town, where dog owners rave over your business and always refer you to others. You can hire other dog walkers as you grow, and turn your side hustle into a sustainable enterprise. You just have to do the work, and do it well.
My 10-year-old son brought home a book from our park’s free library box. It was a biology textbook – teachers edition. He said it looked interesting and hey, it was free (having no idea you could sell it). I scanned it in my Amazon seller app and realized it was worth around $150. He was so excited. We listed it for sale for $130 and it sold! Going to tell him, he just made $130!
No extra rooms, beds, or couches for a weary traveler to rest his head? No problem! You can still rent out another space: your parking space. Homeowners who live within walking distance of major tourist attractions or sports venues will often sell parking spaces in their driveways or on their lawns. But even if you don’t live just down the road from the Indianapolis Motor Speedway or a major music festival, you may still be able to profit off of a parking space. Why not park on the street while you rent your parking space to a neighbor? Sites like JustPark, Parklee, and SpotHero can all help you find a renter for your primo parking spot.

The most liquid of the private investments are investing in equity or credit hedge funds, real estate funds, and private company funds. There will usually be 6 month – 3 year lockup periods. The least liquid of the private investments are when you invest directly into private companies yourself. You might not be able to get your money out for 5-10 years, depending on the success of the company and upcoming liquidity events.

If you have a spare bedroom, you can find a roommate or list the space on AirBnB for travelers. Having a roommate is the more passive of the two, as being an Airbnb host will require more work in the form of turning over the room between stays. This is a super painless way to earn $500 to $1,000 a month without much effort – you may even be able to cover your mortgage payment with this extra income!
Personal finance software can go a long way in helping you to take control of your money and meeting your financial goals. It’s important to note, however, that some focus more on budgeting and expense tracking while others prioritize investing portfolios and income taxes. Explore several different programs and read reviews to find the one that’s right for you.
5. Fiverr – Fiverr is a great place to make a few bucks or spend a few bucks if you need some of the services people offer. Basically, everything is $5. You either pay $5 or charge $5. They call them “gigs.” You can offer your services however you choose. If you sell art and you’re fine selling pieces for $5 each, that’s a gig. If you’re a graphic designer and you want to offer your services for $10/hour, simply offer a 30 minute gig. If they need two hours of graphic design, they pay you $20, or $10/hour by buying four gigs.
Nice writing style Ben. I’m finding out very quickly that to make any money writing, you have to read, read, and then read some more, no matter how smart you feel you are on a subject, before writing your first sentence. I have always been a fan of multiple income streams and am thrilled by the ideas of proofreading, editing, blogging, freelancing and transcribing. Having spent one of my careers doing just that for a large corporation, it’s a perfect fit, but now I can get credit for my work, thanks again for a great article.
If you have a propensity for writing and you can slay with your prose, consider writing an ebook. While the market has certainly become saturated as of late, books that help teach people about a technical topic still sell extremely well. This is a great source of passive income but does require a large amount of effort at the outset before any money is generated.

Understand how a niche website works. A niche website focuses on very targeted, specific information. The content must be specific, useful and interesting to your target audience. Successful niche websites get anywhere from 1,000 to 10,000 visitors per month.[5] You build content on a particular keyword, and you make passive income with Google Adsense or through affiliate links.[6]
This is an ideal strategy if you live in an area where real estate prices are too high to realistically invest in, or you don’t want the hassle and expense of traveling all over the country visiting potential properties. Plus, if you are new to single-family real estate investing, letting a place like Roofstock guide you through the process is a great way to get your feet wet.
To read my posts about how to make extra income and how to make money online, such as through blogging, click here. Below are my monthly extra income reports. I recommend checking out my online course for bloggers, Making Sense of Affiliate Marketing. I earn around $50,000 a month through affiliate marketing and I share my exact strategy and tips in this very informative online course. If you’re a blogger, then you NEED this course.
23. Affiliates – There are many affiliate networks, such as FlexOffers and CJ Affiliate that allow you to promote other people’s products and services. You simply put a link or a banner on your page and then you get a percentage if someone clicks through and buys the product/service. You’ll want to select products that are specifically within your blog’s category.This is an effective way to earn money once you have the traffic coming to your blog.
Most people do not claim all of the allowances they are allowed to take, which is why they end up getting a large refund check each spring. If you regularly get a large refund, then it may be time for you to file a new W-4 with your human resources department. Your new W-4 should reflect the proper number of withholding allowances you are eligible to take.
A freelancing service is something that can, with the right strategy and action, turn into something more productized and passive. Brian Casel, featured guest on SPI Podcast Session #158, talks about how he was able to turn his stress-inducing one-on-one design service business into something that was actually more productized, passive, and profitable. I highly recommend you listen to that episode if you have a service-based business and you feel stuck.

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Getting businesses to advertise on your podcast, either at the beginning or end or both is a great way to create a revenue through podcasts. Most businesses won’t be keen to advertise on your podcast until you can prove a large number of listeners. Therefore, it is unlikely you will be able to start out from the get-go with sponsors. But once you accumulate regular listeners or a high number of downloads from iTunes, you can start to sell advertising space on your podcasts.
Find a profitable niche: We’ve talked about this a lot. But, where are you most comfortable. What niche do your skills, values, and interests intersect? Do you have 10 years of experience as a technical writer? Do you have long-standing PR relationships that’ll be invaluable in helping startups launch a successful crowdfunding campaign? Determine what makes your value unique, and lean heavily on showcasing that strength to your potential clients.
There’s plenty of work and clients to be found. If you know where to look. To start, you need to know if there is enough demand for your skill to make it worth the effort to go out looking for work. Start by searching for freelance postings on sites like Flexjobs, SolidGigs, Contena or one of the dozens of other skill-specific freelance job boards.
Next, you’ll need the right tools. You can be as complicated or simple as you want depending on your comfort with audio equipment, but at the minimum you’ll want a microphone and software for recording your voice. Companies like Behringer, Blue, Focusrite, and others sell studio-quality plug-and-play podcast setups that can get you recording today.
Etsy: While Etsy's popularity has declined recently, it's still a great resource for selling handmade items online. No need for complex ecommerce sites or merchant accounts or any sort of automation. The company takes a commission of every sale and charges a small listing fee per item. But many still use Etsy as their primary source of income. The best part is that you can also sell digital products on here such as poster designs. 
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