Many people take on second jobs as a means to try and increase their monthly incomes. While income is probably the most common reason individuals may want to work two jobs, there are other good reasons to consider adding a secondary job. Many people explore secondary positions as a way to boost their careers and open the door for future opportunities.

There are many ways adding additional employment can help augment a current career or jump-start a new career. In this respect, the benefits are vast. A second job can help an individual gain work experience, receive on-the-job training, and have the ability to network in another field.

In addition, a second job is a terrific opportunity to build a resume with new and/or additional skills, which can be significant advantages to help further a professional career track.

1. Additional Job Experience

A person looking to switch careers may find it difficult to get a full time job in the new industry they want to pursue. Easing in a field through a part time position to gain experience can often lead to full time employment, especially in those fields where it is hard to break into and get hired.

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Part time employment can help you get the proverbial foot in the door. Not always an easy accomplishment, especially if going for a full time position. Some fields are highly competitive and it is hard to find a job, but many companies are often willing to hire part timers.

However, if and when a full time position opens, you have a good shot of being considered for the opening because the employer will already be familiar with your work, your paperwork is already on file and, additionally, you have an understanding of the organization's operations and mission. This means less training, or in other words, equates to less money to invest in you as the company has already invested in you.

Or, in other instances, a second job can complement the primary job. Sometimes certain skills are needed to climb the proverbial corporate ladder, but are difficult to attain without experience; a secondary job may allow the opportunity to build on existing skills and demonstrate ability. As an example, as Fox News Latino notes, a second job may require you to pitch services or products to new clients, and this could grow presentations skills that would augment and improve performance on a primary job1.

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2. On-the-Job Training

If you have no practical experience in a particular field, but are looking to gain some, a second job is a chance to obtain that much-needed training without having to pay for practical experience through seminars or pursue further education. While additional education may be necessary, the on-the-job training opportunities that can be attained through a secondary job are a great way to learn the skills you desire to gain.

3. Networking

In business and careers, networking is a valuable activity. People who work in more than one occupation know double the number of people and also have the opportunity to meet additional contacts. The more networking that takes place, it is very possible new career or business opportunities may arise through these newly formed relationships. Depending on your personal goals, networking through two jobs can lead you in different directions, moving you closer to your ultimate career goals whether it be climbing the corporate ladder, switching fields completely, or even becoming an entrepreneur.

4. Resume Building

A person who works two jobs can get a competitive advantage through being able to list diversified skills, talents and experience to their resume. In addition, different jobs typically come with unique skill sets that can add a lot of attractive attributes to a resume when looking for that dream job.

Pen and PaperCredit: Francois on Flickr/Creative Commons licnese

In addition to these four career boosters, a secondary job can help you develop good time management skills. Individuals who can successfully manage two jobs without being weighed down by the disadvantages of working two jobs are likely to find their time management skills significantly improved. Another boost to a resume.

5. Volunteer Work

The job doesn't have to even be a paying one. Volunteering can also help you boost your marketability and skills. According to LinkedIn research conducted earlier in 2014 (courtesy U.S. News & World Report2, 1 of ever 5 hiring managers in the United States have hired a candidate based on volunteer activity.

This is because two jobs force a person to need to balance two jobs, and their personal life. While this balance is not easy, if it can be accomplished it can greatly enhance the ability to juggle and meet deadlines. This is a valuable career skill, especially in today's world where organizations are scaling back on staff in order to cut costs. 

Working two jobs is not always easy, but if successfully accomplished, it can offer a nice boost to either a current career or open the door to a desired one.