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.

If you speak like James Earl Jones or Scarlett Johansson, quite a number of digital publishers (including game developers, animated film-makers, and training video producers) pay good money for voice talent and the time investment isn't too intensive—making this a great side business idea. You can find these publishers looking for voice-over artists on sites like PeoplePerHour, Freelancer and Upwork, as well as their calls for talent directly on their websites or through voiceover agents. If you do pursue this as a side business idea, be prepared to invest for the long-haul as it can be a very competitive industry.

Online business is how I’ve made a living since 2003 and what has helped me retire early.  I make over $40,000 a month through my blog. You can create your own blog here with my easy 15-minute step-by-step tutorial.  You can start a blog for as little as $2.95 a month (less than a cup of coffee!).  Create a blog and leverage it into affiliate sales or product endorsement deals. Consider topics like:
I’ll personally build you a fully-customizable money-making website, setup an autoresponder and pre-written email follow-up campaign for you and then walk you step-by-step through the process of effectively promoting your website online with free and low cost marketing so you can earn multiple streams of income from home. Start making money with your own website today!
Mow lawns or plow driveways. If you’re willing to mow yards or shovel or plow snow in the winter, you could easily start your own snow removal and lawn mowing business on the side. While you can usually find work by reaching out to your local community via word-of-mouth, flyers, or online message boards, the website Plowz & Mowz allows you to set up an online profile and reach more customers in your area.
No matter how you earn your income, you may need to report it to the IRS at tax time, so keep good records and track expenses. And remember that you shouldn't let your part-time or gig work detract from any full-time or salaried position you already hold. Says Sullivan: "Make sure to be diligent with your time, so you are still able to do your full-time job while making deadlines for side hustles and freelance work."
Also, make sure you’re up-to-date on CPR, first aid and other emergency procedures. Then make sure your own kids are OK with sharing their home every day. Once all of that is wrapped up, go to your friends and neighbors, your kids’ teachers, your place of worship and anywhere else busy parents are looking for day-care services, and get your word out.
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