How enforceable are post-employment non-compete clauses in Japan? How courts assess validity, what employers can do on breach, and points to note for foreign parent company templates

Question

阿部国際法律事務所 · Accepted Answer

A post-employment non-compete in Japan is valid only within reasonable limits, judged by the employer's interest, the employee's position, duration, territory, scope and compensation. Overly broad clauses can be void, so secure trade secrets and confidentiality first.

In Japan, a post-employment non-compete (a promise not to join a competitor or start a competing business after leaving) is not enforceable without limits, even if it is in the work rules or a signed pledge. Everyone has the freedom to choose their occupation (Constitution, Art. 22(1)), and a restriction that goes too far is void as contrary to public policy (Civil Code, Art. 90). Courts weigh the employer's legitimate interest, the employee's position, the length, territory and scope of the restriction and whether any compensation was given. For employers, the practical starting point is to secure trade secrets and confidentiality undertakings first, and to limit non-competes to the people and activities that genuinely need them.

When this becomes an issue

- A sales director resigns and, the following month, starts work at a competitor covering your key accounts.
- Every new hire signs a pledge not to work in the industry for three years after leaving, and you are not sure it means anything.
- Your Japanese subsidiary has employees sign the overseas parent's standard English-language non-compete agreement.
- You discover that a departing director had been setting up a business in the same line while still in office.

1. During employment and after it are treated differently

While employed, an employee is generally regarded as owing a duty, incidental to the employment contract, to act in good faith and not to harm the employer's interests unfairly. Workers and employers must perform their obligations in good faith (Labor Contracts Act, Art. 3(4)). Helping a competing business or preparing to take clients while still employed can therefore be a problem even without a specific agreement.

For directors, the Companies Act is explicit. A director who intends to carry out, for themselves or a third party, a transaction in the company's line of business must disclose the material facts to the shareholders' meeting (or the board, in a company with a board of directors) and obtain its approval (Companies Act, Arts. 356(1)(i) and 365(1)). If a director competes without approval, the profit the director or a third party made from the transaction is presumed to be the company's loss (Art. 423(2)).

After employment ends, there is no longer an employment relationship. To restrict competition after departure, the employer normally needs a basis such as the work rules or an individual agreement.

2. Post-employment restrictions are set by work rules or individual agreement

If, when the employment contract is concluded, the employer has made known to employees work rules that set reasonable working conditions, those conditions become part of the employment contract (Labor Contracts Act, Art. 7). But putting a non-compete in the work rules does not make any restriction valid.

With individual pledges, it is easier to justify the scope when the agreement is made on promotion or departure, when the employee's role and the information they hold are clear, than at the time of hiring. An employee who refuses to sign on departure cannot be forced to.

3. Six factors decide whether a non-compete is valid

Courts look at whether a post-employment non-compete unreasonably restricts the freedom to choose an occupation, weighing broadly the following:

- The employer's interest: is there a legitimate interest to protect, such as trade secrets, customer relationships or proprietary know-how? Simply not wanting to lose staff to competitors is generally not enough.
- The employee's position and duties: did they actually have access to that interest? A blanket restriction on all staff is hard to justify on this point.
- Duration: the longer the restriction, the greater the burden on the employee.
- Territory: a nationwide or worldwide restriction unrelated to the actual business is more likely to be found too broad.
- Activities restricted: a specific restriction such as "no sales to customers you handled" is more likely to be upheld than "no work for any competitor".
- Compensation: is there an allowance, enhanced severance or other payment commensurate with the restriction?

No single factor decides the outcome; the court looks at the overall balance. An overly broad clause may be held void in its entirety.

4. What the employer can do if the promise is broken

If the restriction is valid, the employer may seek an injunction against the competing activity, or claim damages (Civil Code, Art. 415(1)). The employer must, however, prove the loss and that it was caused by the competition, which is not easy.

Another approach is to reduce or withhold retirement allowances. An employer regularly employing 10 or more workers that provides retirement allowances must state in its work rules who is covered and how the allowance is determined and calculated (Labor Standards Act, Art. 89(iii-2)). Clauses reducing or withholding the allowance also tend to be read narrowly, by asking whether the conduct is serious enough to cancel out the employee's past service.

Note also that an employer must not make a contract that sets a penalty for non-performance of the employment contract or fixes the amount of damages in advance (Labor Standards Act, Art. 16). A pledge stating that the employee will pay a fixed sum on breach may therefore be problematic under this provision.

5. Protect trade secrets before relying on a non-compete

What usually hurts an employer most when someone leaves for a competitor is the loss of customer or technical information. The Unfair Competition Prevention Act can protect this.

A trade secret is technical or business information useful for business activities, such as a production or sales method, that is kept secret and is not publicly known (Unfair Competition Prevention Act, Art. 2(6)). Using or disclosing a trade secret disclosed by the holder, for the purpose of unfair gain or to harm the holder, is unfair competition (Art. 2(1)(vii)), and can be stopped by injunction (Art. 3) and give rise to damages (Art. 4). Serious cases are also criminal, punishable by imprisonment for up to 10 years, a fine of up to JPY 20 million, or both (Art. 21(2)).

This protection depends on the information actually being "kept secret". Without access controls, "confidential" markings and confidentiality undertakings, the information may not qualify as a trade secret. Even if a non-compete is held void, the protection of trade secrets and confidentiality obligations remains, so in practice this is where to start.

6. Foreign employees and the parent company's template

Japanese subsidiaries of foreign companies sometimes use the parent's English-language non-compete, with a clause choosing foreign law. Parties may choose the governing law of a contract (Act on General Rules for Application of Laws, Art. 7). For employment contracts, however, even if the chosen law is not the law of the place most closely connected with the contract, the employee can tell the employer that specific mandatory rules of that place should apply, and those rules then apply as well (Art. 12(1)). The law of the place where the work is to be performed is presumed to be the most closely connected law (Art. 12(2)).

For people working in Japan, it is realistic to design the scope and compensation on the assumption that validity may be tested under Japanese law. With foreign employees, it also helps to explain the terms in a language they understand and to keep a record that they signed after understanding them.

What you can do now

- Review the non-compete wording in your work rules and pledges and check whether the duration, territory and activities are stated specifically.
- Consider limiting the restriction to roles with access to trade secrets or key customers, rather than all staff.
- Decide whether you can offer compensation commensurate with the restriction, such as an allowance or enhanced retirement payment.
- Mark customer lists and technical documents "confidential", restrict access and obtain confidentiality undertakings.
- Prepare a departure checklist confirming the return of company property and data, and a written reminder of continuing confidentiality obligations.
- If you use the parent company's template, review the governing law and content for employees in Japan.

When to talk to a lawyer

- A former employee has joined a competitor and is approaching your clients or your staff.
- There are signs that customer data or design documents have been taken.
- A departing employee refuses to sign a non-compete pledge.
- A director has set up a company in the same business without approval.
- The parent company's English contract and your Japanese work rules say different things.

Frequently asked questions

Q. Does a pledge signed on joining let us stop a former employee from changing jobs?
Even with a pledge, an overly broad restriction can be held void (Civil Code, Art. 90). Courts weigh duration, territory, activities, compensation and the employee's position. Restraining the solicitation of clients or the use of trade secrets is usually more achievable than stopping the move itself.

Q. Is a non-compete always void without compensation?
Compensation is one factor and does not decide the outcome on its own. But a heavy restriction with no compensation at all is less likely to be upheld. It is safer to consider some form of payment for anyone you restrict.

Q. Can a non-compete be imposed on directors after they leave?
Competition while in office is restricted by the Companies Act (Arts. 356(1)(i) and 365(1)). There is no statutory rule for the period after a director leaves, so an agreement is needed, as with employees. Validity will depend on how important the information the director had access to was and what compensation was given.

Q. Is a promise to pay a penalty on breach valid?
An employer must not set a penalty or a pre-agreed amount of damages for non-performance of the employment contract (Labor Standards Act, Art. 16). A penalty clause may therefore be problematic under this provision. The usual approach is to claim actual loss, or to deal with the matter through the treatment of retirement allowances under the work rules.

Q. If we choose foreign law, do Japanese limits no longer apply?
You can choose the governing law, but for employment contracts an employee working in Japan who asks for specific mandatory rules of Japanese law to apply will have them applied as well (Act on General Rules for Application of Laws, Art. 12). For employees in Japan, the restriction needs to be one that would hold up under Japanese law.

Q.How enforceable are post-employment non-compete clauses in Japan? How courts assess validity, what employers can do on breach, and points to note for foreign parent company templates

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