Can You Work Part-Time While on Leave? Work Rules, Benefits, and What to Ask HR

Many on leave consider part-time work to supplement income. However, working during leave can affect work rules and sickness benefits, so starting without checking is risky.

This article covers whether part-time work is allowed, what to verify, and reporting obligations.

Part-time work during leave may be possible in some cases

No law universally bans all work during leave. However, work rules or leave conditions often restrict employment, and working without permission can cause problems.

Work that conflicts with the purpose of leave (treatment and recovery) may affect continuation of leave or return-to-work decisions.

What to check in work rules

• Whether side work or other employment is allowed during leave
• Clauses banning work for other companies
• Relationship between leave type (sick leave, childcare leave, etc.) and work restrictions
• Reporting and approval requirements
• Penalties for violations (termination of leave, resignation pressure, etc.)

Even if not written in work rules, restrictions may be stated in leave applications or HR guidance. Always confirm with HR.

Impact on sickness and injury allowance

Sickness and injury allowance is paid by health insurance when unable to work due to non-work illness or injury. If you earn income from part-time work during leave, benefit payment may stop or be reduced.

Under health insurance law, months with work income while receiving the allowance may be excluded from payment. Side income above thresholds can suspend benefits.

Do you need to report to the company?

If work rules require reporting, you must report. Even without explicit rules, hidden work during leave can damage trust.

Before starting part-time work, ask HR whether light work during leave is acceptable. Permission reduces later risk.

Checklist before part-time work during leave

1. Confirm work rules do not ban work during leave
2. Ask HR whether work is permitted
3. If receiving sickness allowance, confirm impact of income
4. Ensure work does not conflict with recovery goals
5. Assess whether work is physically manageable

Other ways to supplement income during leave

• Sickness allowance or other benefits (limited while working)
• Spousal support or family assistance
• Using savings
• Consulting on benefit continuation (labor and social security advisor, etc.)

FAQ

Q. Can remote side work stay hidden?

Working without reporting or permission may violate work rules. Relying on not being found out is high risk.

Q. Can I work part-time during childcare leave?

Childcare leave has separate rules. Work is generally restricted and affects childcare leave benefits. Confirm with the company and Hello Work.

Q. Will leave end if I start part-time work?

Depends on company judgment and work rules. If deemed fit to work, return may be requested. Confirm with HR in advance.

Summary | Do not start without confirmation

Part-time work during leave affects work rules, sickness benefits, and trust with your employer. It is not universally illegal, but starting without permission is risky. If you need income, consult HR first and confirm benefit impact.

※This article provides a general overview of relevant systems and does not reflect individual employment terms or company work rules. Please confirm specific handling with your employer's HR department; for tax matters, consult the tax office or a tax advisor.