As Side Jobs Rise Among Korean SME Employees, There Is Room for a Personal Work Hub

More employees at small and medium-sized enterprises are taking side jobs

The original U.S. Bureau of Labor Statistics data needs to be checked for the number and share of people with multiple jobs in the United States in July 2026.

In Korea, more wage employees at small and medium-sized enterprises (SMEs) are taking side jobs. An analysis published in 2026 by the Korea SMEs and Startups Institute (중소벤처기업연구원), a research institute focused on small businesses and startups, found that 379,304 SME wage employees had a side job in 2025. That was 102,000 more than in 2020.

Among them, temporary workers accounted for 42.4%, and people aged 50 or older accounted for 53.7%. These figures focus on wage employees and exclude self-employed people and freelancers, so they do not represent everyone in Korea with multiple jobs.

More work can also mean more than one type of income to report. People paid wages by two employers may need to use combined year-end tax settlement or consider filing in May of the following year. When wages and side-job income that had 3.3% withheld in advance are received together, they are generally reported together. Income earned in 2026 has its regular filing period from May 1 to May 31, 2027.

A gap has opened for bringing scattered records together

The materials reviewed did not confirm a Korean law newly introduced in 2026 to support people with multiple jobs. Instead, a gap has emerged between the existing filing system and the growing number of SME wage employees with side jobs. There is a window to collect records from August 21, 2026 through the end of December, then test filing-preparation features from January through April 2027.

One platform may not be able to see work, waiting, or travel time on another platform, making it hard to understand a person’s total working time. Workers may have to combine deposit records, withholding documents, receipts, travel time, and work schedules themselves.

Time is also an issue for people using several intermediary apps. In a Korea Development Institute (KDI) survey, a government-funded economic research institute, 132 of 284 people with delivery experience—about half—used two or more delivery or delivery-agency apps. Looking at only one app can make a workday appear short even when the person’s actual day is long.

There is no need to connect every app automatically from the start. A service can begin by letting people upload deposit messages, photos of work schedules, and receipts, then showing daily income and time on one screen and flagging missing records or schedule conflicts.

It is safer to show filing readiness—such as “income from another employer,” “income with 3.3% withheld,” or “unverified deposit”—than to provide a final tax calculation. The final filing decision can be handed off to guidance from the National Tax Service (국세청), Korea’s tax authority, or to a tax professional.

Abroad, services start by putting records in one place

In the United States, solo workers can combine income, travel distance, and expenses from several gig-work apps to see an estimated tax amount. The model charges people who work across several apps around $8 to $15 a month.

In the United Kingdom, FreeAgent helps organize employment wages, self-employment income, rental income, and other income within one tax filing. Individuals and small businesses pay £33 per month for bookkeeping and tax-filing functions.

In Belgium, the Smart cooperative issues invoices on behalf of freelancers working for multiple clients, then converts that work into wage and social-security records. Members pay an annual €30 cooperative share and a fee linked to revenue.

Small things that could start here

1. A side-job tax preparation folder

• A service that gathers wages and side-job deposits with 3.3% withholding into a filing-preparation checklist.
• It is for employees who have just started evening teaching, design work, or delivery work after their main job.
• Because 2026 income needs to be organized before May 2027, people can build a record-keeping habit now.

2. Work-overlap and rest alerts

• It combines several work schedules and flags conflicts and days without rest.
• It is for someone who works in a shop on weekdays and delivers food at night and on weekends.
• This is useful now because no single company or app can see a worker’s total hours.

3. A family care shift calendar

• When a side-job schedule changes, it updates school drop-offs and pickups, hospital accompaniment, and meal responsibilities for the family.
• It is for households caring for children or parents while combining shift work with short-term jobs.
• As the number of jobs rises, an individual’s schedule becomes a family scheduling issue.

4. A one-page income evidence bundle

• It organizes deposits and payment records from several employers and apps into one monthly page.
• It is for people who mix short-term work and freelance work without a fixed monthly salary.
• The burden of finding records again grows whenever scattered income needs to be explained.

What to check today

Ask one person with experience earning income from multiple sources to show you their deposits and work schedules from the past month. Try to organize them into one page within 30 minutes. The one item that takes the longest should become a feature on the first screen.

Why this matters where you are

Korea’s May filing timetable, its 3.3% withholding practice, and its tax administration are Korean conditions, so they will not transfer directly to another market. What may transfer is the underlying problem: workers using multiple employers or platforms can have income, time, and records split across systems. Check whether people in your market must also manually combine those records, and begin with the record that takes them longest to reconcile.