Make and sell crafts. If you are even a little bit crafty, consider selling your goods on a site like Etsy. Though you can make more money on intricate projects (ex. an exquisitely woodburned gourd), even labor-light projects can bring in good money if you’re willing to produce them in high quantities. Who knows – if you do well, you might even be inspired to start a crafts business.

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. 

I’m a huge fan of blogging because I love writing and connecting with people all over the world. To give you an idea of what is possible with blogging, DollarSprout.com is part of a group of blogs that routinely brings in over $100,000 a month in revenue. While it takes time to build your blog up to that income level, you can get the initial set up done in under 30 minutes (no experience needed).
If you live near a university, there are likely all sorts of research studies looking for participants. While I was an undergrad at Virginia Tech, I got paid $500 to participate in a 6-week dietary study. The study provided all my meals and paid me, but I had to eat a 5,000 calorie diet of 50% fat for 6 weeks, plus I had multiple muscle biopsies, urine/blood testing, etc.
Donating plasma can actually work out better than selling your blood.  It takes longer to donate plasma because they will put your red blood cells back in your system. The upside is that you can donate plasma as much as twice a week and you can make anywhere from $40-$60 per donation. You can make that $100 in less than a week if you can stomach the needle.
Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, website of your own or anything else for that matter. All you need to do is be able to provide a high-quality service at a reasonable price. But be informed, you will have to compete with many others that are constantly bidding on open jobs. 
For non-tech people (myself included), web design can cause a lot of stress. And stress means opportunity. If you have a knack for web design or web development, you should definitely be capitalizing on it. And since it’s such a foreign concept for many, it can be a really lucrative side hustle. You can find all sorts of gigs on Upwork. Also, you need to read this article: How to Make $5,000+ a Month Building Websites Part-Time

Use the law of supply and demand to your advantage. Most of us are familiar with the law of supply and demand--the more there is of something, the cheaper it is; conversely, the rarer the product or service, the more expensive it is. However, other than when we get to a toy store before sunrise to get on line for the latest fad toy that kids can't get enough of, we don't really apply the law of supply and demand to our own lives--particularly our careers. For example, if you're aspiring to do something that many, many other people want to do (so much so that they do it for free, as a hobby) then it will be far more challenging for you to make money doing it. On the other hand, if you do something that most people don't want to do, or if you get very good at doing something most people don't do all that well, then you can make a whole lot more money. In other words, choose a career in pharmacy over photography.

26. Services – You can offer a paid service, such as life coaching, blog coaching, goal setting or financial planning. Just be sure to investigate all the legal implications and make sure you’re not claiming to be a professional if you’re not one. With a service like this, you’re basically using your blog to sell yourself. You’ll need to convince people that you’re worth buying and then be able to back up your claims once they purchase your service.
No matter what method you select for generating your online income, there's one very important thing to understand. Today, across this globe, with its 7+ billion inhabitants, there are two recurring things that people are looking for more of. Either people want more time or they want more money. The truth? Time is far more valuable than money. You can't recreate time. Once it's spent, it's gone forever. Not money.

Rent out a parking spot. If you live in a busy or congested area and have parking to spare, you might be able to rent out your parking space for some quick cash when you’re not using it. Simply advertise your open parking space online including details on the location, whether it’s covered or uncovered, and your desired hourly, weekly, or monthly fee. If you want, you can even use a site like Just Park or download the Spot App to reach more potential customers.
I think what you’re asking is how you can make extra money to pay your real estate taxes. If that’s the case, it depends on your current financial situation, the amount of your estate taxes, your skills, and more. If you visit the “Make Money” section of our website, we have a few articles with different ideas that may be helpful for your situation: https://www.dollarsprout.com/category/make-money/
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