From October 1, Japanese Employers Must Tell Part-Time and Fixed-Term Workers They Can Ask Why Their Treatment Differs

First, what does not change: pay does not automatically become equal on October 1

Japan is revising rules for part-time and fixed-term workers under its equal-pay framework from October 1, 2026.

The reform does not mean every part-time or fixed-term worker must automatically receive the same pay as a regular employee.

One major change is that employers must add a new item to employment-condition disclosures: workers must be told they can request an explanation of the content and reasons for treatment differences.

Employers must disclose that asking is allowed

Japan's Ministry of Health, Labour and Welfare says employers must make this right explicit when hiring part-time or fixed-term workers from October 1.

The ministry's guidance says contract renewals are included.

Workers already had the legal right to request explanations. The reform moves one step further by requiring employers to tell them about that right as part of employment conditions.

'Because you are non-regular' is not enough by itself

When explaining a treatment gap, employers must describe how treatment or its determination criteria differ from the comparison regular employee.

The reasons can be based on job duties, the scope of changes in duties or assignments, and other relevant circumstances such as performance, ability and experience, depending on the nature and purpose of the benefit.

The useful comparison is therefore the actual work and responsibility structure, not simply the employment label.

The reform reaches beyond base salary

The 2026 guideline revision clarifies treatment of bonuses, retirement allowances, family and housing allowances, welfare and other benefits.

The ministry provides examples such as family allowances for workers expected to remain employed continuously and housing allowances where the scope of relocation is comparable.

For workers, the relevant review can therefore include bonuses, allowances, leave and benefits as well as base pay.

Pay Gap → Explainable Gap

Banseog describes the shift as Pay Gap → Explainable Gap.

The existence of a difference does not by itself settle whether it is unreasonable.

The more useful question is whether the gap can be explained by the work, responsibility, reassignment scope, performance, ability, experience and purpose of the treatment.

Why workers should re-read payslips and employment-condition notices

People starting or renewing part-time or fixed-term contracts after October 1 can check not only the amount of pay but also the disclosure of their right to request an explanation.

If treatment differs from regular employees, workers can compare base pay, bonuses, retirement allowances, housing and family allowances, leave and benefits.

Finding a difference is not the same as proving illegality. The first step is identifying what differs and why.

Employers cannot disadvantage a worker for asking

The ministry's FAQ states that employers are prohibited from subjecting workers to disadvantageous treatment because they requested an explanation of treatment differences.

Explanations should normally use materials such as work rules or wage tables in an understandable oral explanation, although clear written materials covering all necessary items can also be used.

The policy goal is to make treatment logic understandable, not merely to add another form.

Asking about the gap can reveal what the company actually pays for

A specific explanation can turn a vague feeling that one's salary is low into information about what the employer values.

If the difference comes from experience, responsibility or reassignment scope, the worker can decide whether to build that capability or accept that working arrangement.

Treatment-gap explanations can therefore become a career map: they show what would need to change for pay or role to change.

BANSEOG VIEW | 'Why am I on this treatment?' becomes a career question

October 1 does not make all treatment identical.

It makes the right to ask about treatment differences something the employer must explicitly disclose.

That gives workers a clearer route to ask why the gap exists and what conditions would change it.

The strategic value is not only labor-law transparency. It is seeing the logic behind pay, responsibility, skill and mobility inside the company.