A woman in her thirties who works as a nurse for Britain's National Health Service straps on a food-delivery bag every Thursday evening in London. Her hospital salary has barely moved in three years, while average rents in London have climbed nearly 30 percent over the same period. "I'm living in survival mode," she told the BBC. It wasn't a story about chasing a better tomorrow — it was a confession that she took a second job to cover this month's bills.
If this were happening only in London, it wouldn't be news. But the BBC's report placed it alongside a broader rise in multiple job-holding across the US, Canada, and Australia, pointing to the same two culprits everywhere: the rising cost of living and job insecurity. South Korea is no exception. According to Statistics Korea, the number of people holding side jobs topped 600,000 in 2024 — the highest figure since the agency began tracking the data. Many of them didn't choose this path; it chose them.
A Second Job Filled the Gap Prices Left Behind
The immediate driver behind the rise in side jobs is the widening gap between prices and paychecks. Between 2022 and 2024, South Korea's consumer prices rose nearly 13 percent cumulatively, while wage growth failed to keep pace. Fixed costs didn't budge. It's not unusual for a household's rent, food, phone bill, and insurance to eat up close to 60 percent of disposable income. A second income became a way to balance the books, not a bonus.
Lower barriers to entry, courtesy of digital platforms, played a role too. Delivery riding, freelance-skill marketplaces, e-commerce storefronts, monetized short-form video — setting up a side gig used to take months and upfront capital. Now a smartphone and a bank account are enough to start earning by the next day. Wherever there's pressure, and a path opens up, people take it.
Multiple job-holders interviewed by the BBC said they weighed other options first. They cut spending, looked for better-paying jobs, dipped into savings. Only when none of that worked did they turn to a second job. That sequence tells you something: this looks less like people seizing an opportunity and more like people running out of exits.
That lines up with survey data from Korea's own labor research agency. When it asked people why they'd taken on a side job, "to make ends meet" outranked both "self-development" and "extra savings." More often than not, a second job is functioning as a survival tool, not a tool for self-actualization.
What Happens When You Lose an Hour of Sleep
There's an optimistic case for the multiple-job trend. Side-gig experience can build skills that carry over to a person's main career — filing taxes, handling customers, running digital channels — and for some people, that experience becomes a launchpad into an independent business or a career pivot. Some labor researchers describe multi-job work as a fast track to building portable skills that travel with you anywhere. Among freelancers in their twenties and thirties especially, plenty deliberately juggle several projects at once to build out a portfolio.
But the data on the other side tells a different story. Multiple studies have found that people holding more than one job sleep, on average, over an hour less than people with a single job. Less sleep means worse focus and worse judgment. It's not hard to see how splitting your attention between two jobs could drag down performance at both — and the pattern in the data points exactly that way. Stories of ending up simply doubly burned out are just as common as stories of coming out ahead financially. And the chronic anxiety of feeling like you're not doing either job well wears people down longer than the financial pressure that started it all.
South Korea's legal framework adds another wrinkle. Civil servants and some full-time employees are barred from outside work under their employment terms, and platform workers routinely fall through the cracks of the country's four major social insurance programs. Once side income crosses roughly 500,000 won (about $360) a month, it triggers a comprehensive income tax filing obligation the following May. People who jump in without knowing this often get hit with the tax bill and a penalty at the same time. Skip the step of checking what filing obligations come attached to that second paycheck, and the attempt to climb out of survival mode can pull you deeper into a tax problem instead.
Direction Matters More Than the Number of Income Streams
For solo entrepreneurs and freelancers, this conversation looks a little different. For them, multiple income streams are often the default setup from day one. Not leaning on a single client, but spreading income across several channels — that's simply how many people in that world already operate.
The trouble comes from somewhere else. Having many income channels isn't the same as having a direction. Keep enough plates spinning without ever growing any single one, and eventually you hit a stretch where "busy" and "growing" become indistinguishable. Let that busyness run past two years, and the busyness itself starts to obscure what's actually happening.
In a book about the "second act" after retirement, the author keeps returning to one question: "What are you moving away from, and what are you moving toward?" That question applies just as well to the conversation around multiple job-holders. A second job you started to escape where you currently stand, and a second job you started because you had somewhere you wanted to go — a year later, those two paths diverge. One has no destination. The other does.
Before taking on a new income stream, it helps to work through a few questions in advance. Does this point in the same direction as my main business? How many hours a week can I actually give it, and are those hours coming out of time I need for my core work? When does the income actually start flowing, and can my cash flow hold out until then? Have I already checked what tax filing obligations kick in at this income level? Skip that groundwork, and you can end up in the paradox of adding a new income channel that ends up slowing your whole business down.
The London nurse's choice was about surviving right now. No one can fault her for that decision. But if she's standing in the exact same spot five years from now, that's survival mode hardening into a way of life.
I don't think holding multiple jobs is a problem in itself. But the distance between someone who knows why they started that second job and where it's pointed, and someone who doesn't — over time, that distance shows up as something far bigger than a gap in income.
