Introduction
In Japan, the taxation of retirement income employs a special calculation method that differs from that of salary income and business income. Particularly for foreign individuals and foreign-invested companies, there are many misunderstandings such as "retirement benefits are taxed at a flat rate of 20.42%", "non-residents are not taxed in Japan", and "retirement income deductions are calculated for each employer."
However, in actual tax practice, there are numerous issues such as the determination of resident and non-resident status, domestic work periods, the aggregation of retirement income deductions, and methods of withholding tax. Furthermore, if there is a work history that spans not only the Japanese headquarters but also overseas group companies, tax treaties and allocation of work locations also become issues.
This article organizes the basic structure of Japan's retirement income taxation and the practical issues that are particularly prone to misunderstanding for foreign individuals and foreign-invested companies.
1. What is retirement income in Japan?
Under Japan's income tax law, retirement income refers to salary or benefits of a similar nature received in a lump sum upon retirement.
Examples include the following.
・Retirement benefits
・Lump-sum retirement payment
・Executive retirement compensation
・Lump-sum payment from defined benefit corporate pensions
・Certain stock option exercise gains
・Benefits from small and medium-sized enterprise retirement mutual aid
On the other hand, even if it is named "retirement benefits", if it is judged to be essentially a bonus or deferred salary, it may be taxed as salary income rather than retirement income.
Whether it is recognized as retirement income or not is comprehensively judged based on the following perspectives.
・Is it paid based on the fact of retirement?
・Is it paid as a lump sum?
・Does it have the nature of deferred compensation for services rendered?
Is it not a continuous payment?
Especially in foreign companies, there are cases where the home country's system is directly introduced into Japan, which can easily lead to inconsistencies with Japanese tax classifications.
2. Basic Calculation of Retirement Income Tax
Retirement income in Japan is significantly more favorable compared to other types of income.
The calculation structure is as follows.
Retirement Income = (Retirement Payment Income - Retirement Income Deduction) ÷ 2
This "half taxation" is the most significant feature of retirement income taxation in Japan.
However, caution is needed as this half taxation may not apply in cases where the tenure of executives is 5 years or less, or in cases of short-term retirement allowances.
The amount of retirement income deduction is determined based on the length of service.
For 20 years or less: 400,000 yen × length of service (minimum 800,000 yen)
For over 20 years: 8,000,000 yen + 700,000 yen × (length of service - 20 years)
For example, if the length of service is 25 years and the retirement payment is 20 million yen, the retirement income deduction would be as follows.
8,000,000 yen + 700,000 yen × 5 years = 11,500,000 yen
Therefore,
(20,000,000 yen - 11,500,000 yen) ÷ 2 = 4,250,000 yen
This 4,250,000 yen is subject to taxation.
Compared to salary income, it is clear that this represents a significant tax advantage.
3. Determining "Resident or Non-Resident" Issues for Foreign Individuals
In the taxation of retirement income for foreign individuals, whether one is a resident or non-resident is crucial.
Under Japanese income tax law, the scope of taxation differs as follows.
- Resident: Taxed on worldwide income
- Non-resident: Taxed only on domestic source income
As a result, it is often misunderstood that "if one moves overseas at retirement, they will not be taxed in Japan."
However, for retirement payments, the portion corresponding to work performed in Japan becomes domestic source income based on the location of employment that generated the retirement payment.
Consider the following case.
- 10 years of work in Japan
- 5 years of work in Singapore
- Non-resident at the time of retirement
In this case, the portion corresponding to the 10 years of work in Japan is likely to be subject to taxation in Japan.
In other words, both "the place of residence at retirement" and "the place of employment" are extremely important.
Especially in foreign companies with global mobility, the following issues frequently arise.
- Calculation of length of service including overseas assignment periods
- Allocation of amounts corresponding to work in Japan
- Treatment of portions borne by the overseas parent company
- Relationship with Tax Equalization
- Adjustment of taxing rights under tax treaties
In practice, it is often the case that personnel data and tax data do not match, requiring careful consideration.
4. The Importance of the 'Declaration of Retirement Income Receipt'
When receiving retirement benefits, whether or not to submit the 'Declaration of Retirement Income Receipt' significantly affects the tax calculation.
If the declaration is submitted, the company applies the retirement income deduction and half taxation to withhold tax.
On the other hand, if the declaration is not submitted, tax will be withheld at the following rate.
Withholding tax amount = payment amount × 20.42%.
A common misunderstanding here is the belief that the tax rate on retirement benefits is 20.42%.
In reality, this is merely the withholding method applied when the declaration is not submitted.
For residents, there are many cases where adjustments can be made through final tax returns.
However, for non-residents, it is important to take preemptive measures, as failing to file a final tax return in Japan may result in not receiving a refund.
In foreign-affiliated companies, there are cases where the Japanese entity lacks understanding of the system, leading to the entire amount being processed as 20.42% withholding.
5. Misunderstandings about Length of Service and Group Company Consolidation
For foreign individuals, frequent transfers within the group can complicate the determination of length of service.
For example, there are cases like the following.
- Joining the overseas parent company
- Being seconded to a Japanese subsidiary
- Receiving retirement benefits from the Japanese entity
In this case, if it is determined that the employment relationship is effectively continuing, the overseas work period may be included in the length of service calculation for the retirement income deduction.
Conversely, even if formally a separate entity, if the retirement benefit system is fragmented, consolidation may be denied.
Additionally, if retirement income deductions have been used previously, adjustments with retirement income from 'the year before last and earlier' may be necessary.
This issue tends to be more problematic for foreign expatriates than for Japanese individuals.
The reason is that careers spanning multiple countries and entities are common.
6. Relationship with Tax Treaties
For foreign individuals, consideration of tax treaties is also essential.
The treatment of retirement income under treaties varies by country.
For example,
- Retirement pension clauses
- Other income clauses
- Salary income clauses
are all issues that need to be organized.
Additionally, the treaty treatment of lump-sum retirement benefits and pension forms may differ.
Furthermore, even if it qualifies as domestic source income under Japanese domestic law, the tax treaty may limit Japan's taxing rights.
However, applying the treaty usually requires procedures such as submitting a tax treaty notification form, and it is not automatically applied.
In practice, it is important to confirm the following points.
- Country of residence
- Place of employment provision
- Country where retirement benefit funds are formed
- Paying corporation
- Tax treaty provisions
- Treaty application procedures
In particular, cross-border cases with the US, UK, Singapore, Hong Kong, etc., often require individual analysis.
7. Common Practical Misunderstandings in Foreign Companies
In foreign companies, the following misunderstandings are frequently observed.
・Overseas retirement benefits are tax-exempt in Japan.
・Non-residents do not need to file in Japan.
・Retirement income deductions are reset for each employer.
・Retirement income is always taxed at half.
・Executive retirement benefits are the same as those for regular employees.
・Payments from overseas parent companies are not taxed in Japan.
However, in Japanese tax matters, many situations are judged based on "substance."
Especially during tax audits, the following are key points of verification.
・Actual work situation
・Salary burden relationships
・Secondment contracts
・Cost burden
・Retirement benefit regulations
・Executive eligibility
・Short-term employment eligibility
In the case of foreign individuals, there are instances where they are taxed in both Japan and overseas, making it important to address the risk of double taxation.
8. Summary
While there are significant tax advantages in Japan's retirement income taxation, the system structure is very complex.
This is especially true for foreign individuals and foreign companies.
・Determination of resident/non-resident status
・Allocation of domestic work periods
・Consolidation among group companies
・Tax treaties
・Retirement income deductions
・Short-term retirement allowances, etc.
These issues are intertwined.
Additionally, there are many misunderstandings such as "taxed at 20.42%" and "overseas work is completely tax-exempt," which can lead to withholding errors and double taxation.
As cross-border HR becomes more common, retirement income taxation is not just a payroll tax issue but also relates to international taxation, HR, social insurance, and transfer pricing.
Therefore, it is important for both foreign individuals and foreign companies to conduct consistent tax management not only at the time of retirement but also at the time of joining, assignment, and repatriation.
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