People are always looking to have their cars washed and detailed. You could be a mobile car washer and detailer with a permanent location. Reach out to people you know or make some flyers and put it in your neighbors' mailboxes. If you want to get serious about it, prop up a one-page website or give out business cards. You can make money quickly doing this.

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Start a bed and breakfast. If you live in a popular resort area or own a historic property, a B&B might be the perfect side hustle. Not only can you work at home with this career, but you’ll also score some tax write-offs in the process — although most innkeepers caution that the profession requires a lot of hard work and is more of an attractive lifestyle than a money-making pursuit.
Another suggestion for passive income is refinancing your mortgage. Imagine, for example, that you're making monthly mortgage payments of $1,500 now and can reduce that to $1,200 per month by refinancing your home loan at a lower interest rate. That will let you keep $300 in your pocket each month. Of course, refinancing isn't free -- there are closing costs -- and you'll start the clock ticking on a new loan (typically of 15 or 30 years) when you refinance.
21. Facebook – Facebook swap shops are great for selling things locally. It’s like CraigsList, but a little easier. You simply search for swap shops in your area and ask to join the group. Once you’re in, take a picture of the item, write a quick description with the price and post it. It doesn’t get much easier than that. You can generally expect to get about what you would get at a yard sale, maybe a little more.
If you spend a lot at Amazon.com, for example, you can get a card that rewards you with 5% cash back on Amazon purchases -- which can really add up. Stores such as Target, Costco, Gap, Lowe's, TJX, and Wal-Mart also offer cards. Plenty of retailer cards offer 3% to 5% in cash back or discounted prices and many offer other perks, too, such as free shipping. If you travel a lot, travel-related credit cards can help you rack up lots of points and rewards that can be used instead of cash, keeping more cash in your pocket.
Work remotely for a call center. Because many call center jobs are location independent, finding work in this field is an easy way to earn some money from home. Dozens of sites list job openings for call-center representatives, including Freelancer.com and SimplyHired.com. Meanwhile, you should check local job listings for openings and opportunities as well.
You can earn money online on websites like Virtual Assistant Jobs, Indeed, or Upwork. Many virtual assistants have also found ways to make money online by reaching out to brands and entrepreneurs asking if they’re interested in hiring a virtual assistant. Using a combination of job posting applications and outreach, you’ll be more likely to make money fast. Build an active social media presence on Twitter and LinkedIn to help you find new clients.
Those who love teaching but would prefer to make passive income could consider teaching online courses. With online courses, you can teach topics that go beyond what a tutoring gig for students would teach. If you’re great at building stable relationships, you might create a relationships course. If you’re an ecommerce expert, you might teach a course about dropshipping. There’s no limit to what you can teach. You can also niche down within an industry to teach courses about specific subtopics. For example, instead of teaching public relations you might teach a course about growing your blog traffic.

Sign up with focus groups in your area. Studies that you are eligible to participate in pop up sporadically but pay quite well – often more than $50 for an hour of your time. You can also look for focus groups online but will have to sort through a lot of bogus “opportunities” and sites that ask you to pay up-front for the privilege of participating before you find anything worthwhile.
Make money on YouTube. People who love the spotlight and have other online hustles should consider creating their own YouTube channel. If you’re interested — and interesting — you can use the platform to market affiliate products, sell products you create yourself, or receive ad revenue for your informal tutorials or entertaining videos. Once you get the ball rolling, YouTube offers a partner program that can help you monetize your business further.
Jack up your prices. If you're providing a skill, service or product that is in high demand and low supply, and you're making the most of your time, you should be making good money. Unfortunately, there are many people who are too humble or fearful to demand that they get paid accordingly. It's the pushovers in life who get taken advantage of and exploited, so if you think you might be one of them, learn how to stop being a people pleaser. If you work for someone else, ask for a pay raise or get a promotion, and if none of that pans out, revisit your career options as described previously. If you're self-employed, the first thing to do is to make sure your customers and clients pay up on time--this alone can substantially improve your income. Check your prices and rates against those of your competitors--are you undercutting them? Why? If you're providing a superior product or service, you should be getting at least the average, unless your profitability depends on mass production, in which case you're probably making a lot of money and wouldn't be reading this article anyway!
Participate in medical studies. If just the thought of this frightens you, know that the intensity of such studies varies greatly. Some studies ask participants (particularly those with medical conditions) to test treatments or medications that can have adverse side effects, but others ask participants to perform physical tasks with no lasting effects. If you are able-bodied and paranoid about keeping it that way, you can even participate as a control in a study at a nearby medical research facility or medical school.
Rose and others looking for employment this summer: Retry the babysitting idea. Summer is a good time to babysit. Maybe volunteer a few times first and then use those families as references. Tell everyone you know that you are available to babysit. Use email, Facebook, fliers, word of mouth. Also try offering a set time every week, like Tuesday evenings form 5-9 pm in your home. Parents know they can drop off their children without calling ahead. They really appreciate that. It takes time and persistence to get the word out, butit can be done!
I recently stumbled on the Trim app and I have to say, this one is a game changer. It’s a simple app that acts as your own personal financial manager. Once you link your bank to the app, Trim analyzes your spending, finds subscriptions you need to cancel, negotiates your Comcast bill, finds you better car insurance, and more. And of course, the app is free! My bet is that it will only take a few days for Trim to put an extra $100 in your pocket. So easy!
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