Employment Contracts and Probation Periods in Japan

Most international companies hiring their first employee in Japan assume the employment contract works the same way it does at home: draft a letter, state the salary, set a probation period, and move on. Japanese employment contracts look similar on the surface, but the legal framework underneath is meaningfully different, and a contract written like a US or UK offer letter can create problems you won't discover until you try to exit someone.

This guide covers what a Japanese employment contract typically needs to include, how probation periods function in practice, and where employers most commonly get into trouble. As with most Japan employment topics, the specifics depend on your entity structure and the individual's circumstances, so confirm anything consequential with a qualified Japan labor attorney (a bengoshi) or labor and social security specialist (a sharoushi) before you finalize a contract.

The legal baseline: written terms are mandatory

Under Japan's Labor Standards Act, employers are required to clearly state certain working conditions in writing at the time of hiring. This isn't optional boilerplate — it's a statutory obligation, and the required items typically include:

• Contract period (fixed-term or indefinite)
• Place of work and the duties to be performed
• Working hours, including start and end times, breaks, and any shift arrangements
• Wages: how they're calculated, when they're paid, and the payment method
• Rules on resignation, including notice requirements
• Conditions for dismissal, if applicable

In practice, most companies provide this information through a combination of an offer letter or employment contract and a notification of working conditions document, plus a reference to the company's work rules (shugyo kisoku) where relevant. If your company doesn't yet have formalized work rules in Japan, the individual contract needs to carry more of this detail on its own.

A contract that simply says "standard company terms apply" without specifying these items is not just bad practice — it can fail to meet the statutory disclosure requirement.

Indefinite vs. fixed-term contracts

Japan recognizes two basic contract structures, and the choice matters more than it might for a company used to at-will employment:

Indefinite-term (seishain-style) contracts have no end date and are the default expectation for full-time, permanent hires in Japan. Once someone is on an indefinite contract past their probation period, Japanese courts set a genuinely high bar for ending the relationship — far higher than most international employers expect. This is the single biggest mismatch between Japanese law and the "employment at will" assumption many foreign hiring managers bring with them.

Fixed-term contracts run for a defined period and can be renewed, but repeated renewal creates its own legal exposure: an employee whose fixed-term contract has been renewed enough times, or who has worked under successive fixed-term contracts for more than five years, generally gains the right to request conversion to an indefinite contract. Fixed-term contracts are common for specific use cases (a defined project, a maternity-leave cover, a trial engagement before converting to a full hire) but they're not a general-purpose tool for keeping flexibility on a core role, and using them that way tends to create more legal and retention risk than it solves.

For a first Country Manager, Sales Lead, or other core hire, most companies use an indefinite-term contract from the start, with a probation period built in rather than a fixed term.

How probation periods actually work

A probation period (shiyou kikan) in Japan is not a trial period during which the employee can be dismissed freely. This is the point that surprises international employers most.

Typical structure:

• Probation periods usually run three to six months, occasionally extending to a year for senior roles, and should be stated explicitly in the contract.
• During probation, the employment relationship is still generally treated as an indefinite-term contract from day one — the probation period doesn't delay the start of indefinite employment, it just gives the employer a somewhat wider (but still limited) basis for ending the relationship if things aren't working out.
• Dismissing someone during probation is easier than dismissing a confirmed employee, but it still requires an "objectively reasonable" basis — documented performance issues, a clear mismatch with the stated job requirements, or conduct problems. It is not equivalent to an at-will termination.
• If an employer wants to end the relationship within the first 14 days of probation, notice requirements are minimal. After 14 days, standard dismissal notice rules generally apply (typically 30 days' notice or payment in lieu).

The practical implication: don't treat probation as a safety net that lets you delay a real hiring decision. Use it for what it's actually good for — catching a genuine mismatch early, with documentation — and go into the hire assuming that past the probation window, the relationship becomes substantially harder to unwind.

What belongs in the contract itself

Beyond the statutory minimums, a well-constructed contract for an international company's Japan hire typically addresses:

• Job scope and location flexibility. Japanese contracts often define duties and work location more narrowly than Western contracts. If you want the flexibility to change someone's role or relocate them later, that flexibility needs to be written in, not assumed.
• Compensation structure. Japanese pay is usually discussed and budgeted as an annual figure built from base salary plus bonus payments rather than a flat monthly or annual base — see our guide on bonuses and the annual compensation structure in Japan for how to structure this correctly.
• Working hours and overtime treatment. Whether the role is subject to standard overtime rules or falls under an exempt category needs to be specified, along with any required labor-management agreement (the "36 agreement") covering overtime.
• Probation terms, stated explicitly with a defined length rather than left open-ended.
• Confidentiality, IP assignment, and non-compete terms, each of which has narrower enforceability under Japanese law than many international employers expect — particularly post-employment non-competes, which Japanese courts will often strike down or narrow if they aren't reasonably limited in scope, duration, and geography, and aren't paired with adequate compensation.
• Governing law and language. Even if you draft in English for internal purposes, provide an authoritative Japanese-language version; in a dispute, ambiguity between versions tends to resolve in the employee's favor, and Japanese courts and labor bureaus will expect a Japanese-language contract regardless of what the company's internal language is.

Common mistakes

A few patterns show up repeatedly with first-time Japan employers:

1. Copying a US-style offer letter that implies at-will employment, omits the statutory disclosure items, and doesn't address probation terms explicitly.
2. Treating probation as low-risk termination insurance. It reduces risk compared to post-probation dismissal, but it doesn't eliminate the need for a documented, reasonable basis.
3. Writing an overly broad non-compete and assuming it's enforceable as written. Unreasonable non-competes are a common source of later disputes and are frequently unenforceable in their original form.
4. Skipping the Japanese-language version of the contract, which creates both a compliance gap and a practical problem if a dispute ever reaches a Japanese labor bureau or court.
5. Not deciding entity strategy before drafting. Whether you're hiring through an Employer of Record or your own Japan entity changes who the contracting party is and what obligations sit where — see our guide on EOR vs. local entity in Japan if you haven't settled this yet.

The bottom line

A Japanese employment contract needs to do more legal work than its Western equivalent, because Japanese labor law assumes a stronger baseline of job security than most international employers are used to. The fix isn't complicated — get a Japan-qualified employment lawyer or sharoushi to review or draft the contract, use probation deliberately rather than as a substitute for a real hiring decision, and don't assume terms that are standard in your home market (at-will employment, broad non-competes, informal role flexibility) will hold up the same way in Japan. Getting this right at the offer stage is far cheaper than discovering the gaps later.