Every word and statistic on it should relate directly to the job or assignment you're seeking.
Therefore, the question whether you should include on the resume a side hustle is easy to answer: Yes, if it reinforces the pitch you're making. And, no, if it doesn't.
If it does, then you have to explicitly state in the resume the linkage.
Here's an example from my own career path.
For years, my core competence had been marketing communications, in all its forms. Those ranged from ghostwriting to email blasts.
During that timeframe a side hustle was coaching lawyers in career transition. I could include that side hustle on all my pitch materials because it involved teaching lawyers how to present themselves in all mediums to employers.
When revenues from the side hustle significantly exceeded those for marketing communications per se I made that the primary business.
Of course that entailed redoing all my own pitch materials. The core service provided currently is coaching. Communications became the side hustle. I link the two in the resume by positioning and packaging my background in communications as the edge I have in assisting job hunters to present themselves.
The mindset those I coach develop is to approach the search like a sales call. They must control the process without those hiring realizing it. The goal is to close - that is, receive a job offer or the assignment.
Along the way of that transition to coaching, there's been an amazing development.
The coaching expertise has brought in many communications assignments. Those hiring seem to assume that a coach must posses those soft skills like empathy and ability to deliver feedback diplomatically. An example is that I am editing written materials for professors, students, and small businesspeople in China and Canada for whom English is a second language.
In general, given the volatility in the labor market, creating side hustles is a survival mechanism. I recommend those I coach to develop multiple forms of income.
The document review assignment they have today in legal services could be done through artificial intelligence tomorrow. If they had a side hustle in tutoring students for the LSAT or GRE exam, they wouldn't fall financially off the cliff if the primary source of earnings tanks.
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