Should Students Transfer Their Health Insurance to the Company During a 2-Month Summer Job? Staying Under Parents' Coverage Might Actually Cost More — See the Calculations

Summer is a common time for students to work part-time and earn money for living expenses. If a student is already covered under their parents' National Health Insurance (NHI), do they need to transfer their coverage to their employer upon taking a two-month job? In fact, regulations for short-term employment differ from those for regular long-term employees.

According to Taiwan's Central Bureau of National Health Insurance (CBNHI), students working fewer than three months may choose to remain insured under their original status (e.g., as a dependent) or switch to being covered by their employer. However, the premiums under each option may vary. Starting in 2026, the monthly minimum wage will rise to NT$29,500. If a student remains on their parents’ plan and receives a single lump-sum payment from an employer that meets or exceeds this threshold, they may be subject to a 2.11% supplementary insurance fee.

Must students transfer NHI when working a 2-month summer job?

The CBNHI states that students engaged in short-term work lasting less than three months may either continue being covered as dependents under their parents or switch to employer-based insurance. Therefore, if a college student has been covered under their father or mother and takes a two-month summer job, they are not required to immediately transfer their NHI to the company, as long as the work duration qualifies as short-term.

However, this choice is limited to jobs under three months. The CBNHI notes that part-time workers who report to work every day—regardless of daily hours—or who work more than 12 hours per week (even if not daily)—must generally be enrolled by their employer. Short-term workers employed for fewer than three months have the flexibility to stay with their original insurer or switch. But if a student starts working during summer and continues after school resumes, exceeding three months and meeting the attendance or hour requirements, the employer must enroll them in NHI.

Why might you still pay 2.11% even when covered under your parents?

Many students wonder: if I'm already covered under my parents’ NHI, why does my paycheck show a deduction for supplementary insurance? The reason lies in the "supplementary insurance fee for part-time income."

According to CBNHI rules, individuals receiving part-time wages from an employer where they are not insured must pay a 2.11% supplementary insurance fee if a single payment reaches or exceeds the government-announced minimum wage. Starting January 1, 2026, the monthly minimum wage is NT$29,500. Thus, any single part-time payment of NT$29,500 or more triggers this fee.

For example, college student Xiao Ming works two months at a company, remaining under his father’s NHI coverage. The company pays him NT$29,500 once per month:

NT$29,500 × 2.11% = NT$622.45

This means approximately NT$622 is deducted from each paycheck as a supplementary fee. Over two months, this totals about NT$1,244. The CBNHI has previously cited similar cases. One student worked two months at a cram school, stayed under their mother’s coverage, earned NT$28,590 (which met that year’s threshold), and had NT$603 deducted as a supplementary fee. The bureau advised short-term workers to compare premium costs under different enrollment options to choose the most favorable one.

How much would the monthly NHI premium be if switching to employer-based insurance?

If a student chooses to enroll through their part-time employer, the minimum monthly insured salary level for 2026 for private enterprises, institutions, and employees with formal employers is NT$29,500. Without dependents, the employee’s monthly premium share is NT$458.

Using Xiao Ming’s case again: if he stays under his parents’ plan and receives a single NT$29,500 payment monthly, the supplementary fee is ~NT$622. If instead, the employer enrolls him at the NT$29,500 level, his regular monthly premium is only NT$458.

The difference is about NT$164 per month. Over two full months, total costs would be ~NT$1,244 vs. ~NT$916—a difference of ~NT$328. Actual costs depend on the student’s original dependent premium and the number of chargeable dependents in the household. The CBNHI recommends comparing the employee’s self-paid premium versus the sum of the dependent’s regular premium plus the part-time supplementary fee to determine the better option.

Staying under parents or switching to the company? Household dependent count affects outcome

When a student is covered as a dependent, the primary insured person pays the premium. Therefore, whether the student switches insurers may affect the family’s total monthly NHI cost.

Under NHI rules, when a primary insured person covers more than three dependents, only three are counted for premium calculation. So, if a parent already has four or more dependents and one student switches to employer-based insurance but at least three remain, the family’s premium remains unchanged.

However, if there were originally only one to three chargeable dependents, removing one reduces the count, potentially lowering the family’s overall premium. Thus, even though NT$622 exceeds NT$458 in the earlier example, not every household will see the same savings by switching to employer-based insurance.

What if summer job pay is below NT$29,500?

Another key factor is the amount of each part-time payment. The supplementary fee applies only when a single payment reaches the announced minimum wage. In 2026, that’s NT$29,500. So, if a student remains under parental coverage and receives a single part-time payment below NT$29,500, no 2.11% fee is charged.

For instance, if a student works only a few days a month and receives NT$20,000 per monthly payment, it differs from receiving NT$29,500 at once. As long as the job qualifies as short-term (<3 months), the cost difference between the two insurance options depends heavily on the family’s existing dependent premium burden. Actual differences hinge on work duration, payment amounts, household’s insured salary level, and number of chargeable dependents.

Which NHI option saves more during a 2-month summer job?

If staying under parents, calculate the family’s existing dependent premium plus potential 2.11% supplementary fee if a single payment hits NT$29,500. If switching to employer-based insurance, consider the insured salary level and the employee’s monthly premium. At the 2026 minimum of NT$29,500, employer-based monthly cost is NT$458. Remaining under parents with a single NT$29,500 payment incurs ~NT$622 in supplementary fees. Staying under parents isn’t always cheaper—the final cost varies by household.

Students who choose employer-based insurance should confirm their NHI status transitions smoothly after the job ends. The CBNHI advises using the "NHI Express - Health Record" app to check enrollment history, current insurer, and enrollment/withdrawal dates to avoid coverage gaps.

Sources: Ministry of Health and Welfare, Central Bureau of National Health Insurance – “Short-Term Workers: Choosing the Most Advantageous NHI Option,” “Student Part-Timers: Know Your NHI Rights”; 2026 NHI Premium Tables for Private Enterprises and Employed Individuals; Supplementary Fee Calculation Formula; General Premium Principles; Ministry of Labor Minimum Wage Data.

This article summarizes current CBNHI and regulatory guidelines. Actual eligibility, premium amounts, and supplementary fees may vary based on individual status, payment methods, and family circumstances. For questions, refer to the latest CBNHI announcements or contact them directly.