Even if you have a full-time job making decent money, I'm sure you'll agree that it's always nice to have additional income.  If you want to retire early, you need enough income to build up a sizable nest egg.

The good news is that there are a number of ways to bring in additional revenue.  Here are some of the best sources to bring in extra income...

Freelance Work

Upwork:  Upwork is a result of a merger between oDesk and eLance, resulting in the top freelancing site in the world. They offer jobs for designers, writers, translators, marketers, and much more.

Fiverr:  While Fiverr is a smaller network than Upwork, it provides additional freelancing opportunities in design, writing, marketing and more.

99designs: Whether you're a designer yourself or you want to hire a designer, 99designs is the best platform for design work.

Gig Economy Jobs

DrivingUber is currently the world's largest on-demand rideshare service, but Lyft is right behind them (Get $10 Bonus).  Many people work for both companies.

Deliveries:  You can be part of Amazon's ginormous ecommerce system with the Amazon Flex program.  Or deliver food and other local goods with Postmates.

Pets:  If you enjoy walking dogs, then Wag! is for you.  Alternatively, Rover is great if you prefer pet sitting & overnight boarding.

OtherTaskRabbit lets you do all kinds of random tasks for people.  UrbanSitter is for babysitting.  If you're a chef, check out Feastly.  And HelloTech is for folks that can help with tech issues.

Sharing Economy

Homes:  If you own a house or apartment, you can rent the entire home or even just a room on Airbnb.  If you own or rent in a multi-unit building, you can use Pillow to Airbnb your unit.  And if you just want to rent your space by the hour for meetings or events, check out Peerspace.  You can even rent out storage space in your home at StoreAtMyHouse.

Cars:  You can rent your car or vehicle on Getaround (get a $20 credit) or on Turo.  And if you have a parking space available, you can rent it on CurbFlip.

Bikes:  With Spinlister, you can share your bike, snowboard, or surfboard.  If you have a motorcycle, you can rent it on Twisted Road.

Boats:  If you're lucky enough to own your own boat, you can even rent that out on Sailo or Boatsetter.

Selling Stuff

Letgo:  This app is great for selling electronics, games, clothes, and even big items like cars and furniture.

Decluttr:  Perfect for selling smaller items like cell phones, games, DVDs, CDs, and books.

BookScouter:  If you're a student, you can use this site to buy and sell your textbooks for the best price.

Notes / Disclaimers:

  1. The terms listed above are subject to change.  Always double-check the information on the company's website.
  2. Some of the links above are affiliate links.  If you sign up through one of the affiliate links we may get a small referral fee.  Please know, however, that we never base our recommendations on whether there is an affiliate offer.