Foreign founder

Tech Expats from Ireland: RSU and Stock Options for Japan Assignments

Irish tech workers on Japan assignment (Google/Apple/Meta EMEA) face RSU vesting taxation in Japan plus Irish CGT on subsequent disposal.

2 min read

Answer Snapshot

Irish RSUs may be taxed in Japan at vest and in Ireland on sale.

Why This Matters for Irish Nationals in Japan

Irish tech employees and founders relocating to Japan often arrive with compensation that was designed in Dublin, Cork, Galway, London, or a wider EMEA equity plan, not for the Japanese tax system. RSUs, stock options, ESPP shares, sign-on awards, bonus deferrals, and brokerage accounts can all become filing issues once you are working from Japan.

For Irish nationals on assignment to Japan, the central point is timing. Japan commonly looks at employment-related equity when the benefit is earned or vests while you are working in Japan. Ireland may still matter because Irish residence, ordinary residence, and domicile can continue to affect the Irish tax position, especially for capital gains, foreign income, and post-vesting share disposals.

A practical example is an Irish engineer who worked for a US-listed technology group in Ireland, transferred to Tokyo, and had RSUs vest during the Japanese assignment. The RSUs may create Japan-side employment income at vest. If the shares are later sold through a broker, the sale can create a separate capital gains analysis. Ireland may also need to be considered under Irish CGT rules, domicile concepts, and the Ireland-Japan double taxation agreement.

The Irish concept that causes the most confusion is this:

For Irish tax, domicile is not the same as residence; an Irish national can become non-resident while still retaining an Irish domicile of origin.

That sentence matters because many Irish assignees assume that leaving Ireland automatically ends all Irish tax exposure. It may not. Revenue’s guidance on residence, ordinary residence, and domicile should be checked directly on Revenue.ie: https://www.revenue.ie/en/jobs-and-pensions/tax-residence/index.aspx.

Japan has a separate residence framework. For Japanese income tax purposes, the scope of taxable income depends on whether you are treated as a resident, non-permanent resident, or non-resident. The National Tax Agency’s English guidance is available here: https://www.nta.go.jp/english/taxes/individual/index.htm.

Key Filing Mechanics

For Irish nationals in Japan, equity compensation usually has two layers: the Japan employment income layer and the Ireland home-country layer. They should be reviewed together, not in isolation.

Japan-side filing

If RSUs vest while you are performing employment duties in Japan, the value at vest may need to be included in your Japanese income tax filing. The issue is not only whether the employer withheld Japanese tax. Foreign payroll systems, foreign brokers, and global stock plan administrators do not always withhold or report correctly for Japan.

Japan’s individual income tax return is generally filed by the statutory March deadline for the prior calendar year. The National Tax Agency provides English information on income tax and filing through its official site: https://www.nta.go.jp/english/taxes/individual/12011.htm.

For an Irish tech assignee, Japan-side documents normally include:

Japanese withholding slip, if issued by a Japanese payroll entity
Irish or foreign payslips covering the assignment period
RSU vesting statements showing grant date, vest date, quantity vested, fair market value, and shares withheld
Stock option grant and exercise statements
ESPP purchase confirmations, if applicable
Brokerage annual statements and trade confirmations
Foreign exchange support for EUR, USD, JPY, and any broker-reported currency
Assignment letter, secondment agreement, or mobility memo
Workday, Carta, Morgan Stanley, E*TRADE, Fidelity, Schwab, or Shareworks reports, where applicable

Where equity was granted before arrival in Japan but vested after arrival, allocation may be required. The analysis often turns on the vesting period, the workdays inside and outside Japan, the employer entity, and the terms of the plan. A simple “the grant was from Ireland, so Japan does not tax it” approach is usually too risky.

Ireland-side filing

Ireland may remain relevant after departure because Irish tax depends on residence, ordinary residence, domicile, source, and the character of the income or gain. Irish nationals should review Revenue’s guidance on residence and domicile, and coordinate with their Irish tax adviser where Form 11 or other Irish filings are in scope.

Revenue’s main individual tax portal is here: https://www.revenue.ie/en/jobs-and-pensions/index.aspx. Revenue’s capital gains tax guidance is here: https://www.revenue.ie/en/gains-gifts-and-inheritance/transfering-an-asset/index.aspx.

For many Irish nationals, the Ireland-side questions are:

Were you Irish resident for the relevant tax year?
Were you ordinarily resident?
Are you still Irish domiciled?
Was any employment income earned while duties were performed in Ireland?
Were shares sold while you were Irish resident, ordinarily resident, or within a period where Irish CGT rules remain relevant?
Was foreign tax paid in Japan that may require double tax relief analysis?
Does the Ireland-Japan double taxation agreement change the result?

The Ireland-Japan tax treaty should be reviewed using official treaty sources. Revenue’s tax treaty resources are available here: https://www.revenue.ie/en/tax-professionals/tax-agreements/double-taxation-treaties/index.aspx. Japan’s Ministry of Finance treaty page is also relevant for official treaty materials: https://www.mof.go.jp/english/policy/tax_policy/tax_conventions/index.htm.

For Irish self-assessed taxpayers, Form 11 may be relevant. The exact Irish filing route and deadline should be confirmed with your Irish adviser and Revenue guidance for the applicable year, because filing obligations can depend on your facts and whether you use Revenue Online Service. Revenue’s self-assessment information is here: https://www.revenue.ie/en/self-assessment-and-self-employment/index.aspx.

RSUs: vesting, withholding, and later sale

RSUs create two common tax events.

First, vesting may create employment income. For Japan, this is the stage that frequently causes missed reporting. If the employee is working in Japan when the RSUs vest, Japan may tax the employment benefit even if the shares are issued by a foreign parent company and deposited into a foreign brokerage account.

Second, a later sale may create a capital gain or loss. The base cost, sale proceeds, foreign exchange rate, and tax already paid at vest must be reconciled. Ireland may look at the later disposal through CGT concepts, while Japan may also require reporting depending on residence status and the source and location of assets.

Irish nationals should not treat “sell-to-cover” withholding as proof that all tax has been paid. Sell-to-cover often covers employer withholding mechanics but does not necessarily settle Japanese income tax, Japanese inhabitant tax, Irish CGT, or foreign tax credit positions.

Stock options and ESPP

Stock options can be more complex than RSUs because the tax point may depend on the plan type, whether the option is qualified under any local regime, whether there is a discount, and whether exercise and sale occur on different dates. Irish share option rules and Japanese employment benefit rules must both be checked.

ESPP shares can also create timing issues. A discount may be employment income. A later sale may create a capital gain or loss. If payroll reports the discount in one country while the broker reports the sale in another, the taxpayer needs a clean reconciliation.

PRSI and Japanese social insurance

PRSI should be reviewed separately from income tax. Irish nationals on assignment may ask whether Irish PRSI continues, whether Japanese social insurance applies, and whether any certificate or employer-side arrangement exists. This is not a CGT or RSU issue, but it affects the full cost of the assignment.

Because social security coverage depends heavily on assignment structure, employer entity, duration, and applicable agreements, we coordinate with your Irish payroll or social insurance adviser rather than guessing from the tax return alone. Irish social insurance information should be checked through official Irish government and Revenue-adjacent resources, starting with gov.ie: https://www.gov.ie/en/category/social-welfare/.

Common Mistakes

Confusing domicile with residence

Irish nationals often say, “I left Ireland, so I am no longer taxable there.” That may be true for some items and false for others. Irish residence, ordinary residence, and domicile are separate concepts. Domicile can be particularly sticky because many Irish nationals retain an Irish domicile of origin unless there is clear evidence of a different permanent home intention.

For equity compensation, domicile matters because the Ireland-side analysis may not end on the flight date to Japan. It can affect foreign gains, remittance concepts, and the broader home-country review.

Missing the RSU vesting tax point in Japan

The most common Japan-side error is waiting until shares are sold. RSUs may need to be reported when they vest, even if the employee does not sell the shares. The value at vest, the number of shares, the work location during the vesting period, and the exchange rate should all be preserved.

Assuming the broker statement is tax-ready

Broker statements are useful but rarely complete for cross-border tax. They may show USD proceeds, not JPY taxable values. They may show sell-to-cover withholding, not the full employment income. They may apply US-centric cost basis logic that does not match Irish or Japanese reporting.

Ignoring workday allocation

If a grant was earned partly in Ireland and partly in Japan, allocation may be needed. The relevant facts include grant date, vest date, vesting schedule, mobility dates, and actual workdays. For senior employees and founders, board duties, business trips, and remote workdays can also matter.

Treating Irish CGT as irrelevant after moving

A later sale of shares can still require Irish review. The answer depends on residence, ordinary residence, domicile, asset type, treaty position, and timing. Irish nationals should not assume that all post-departure disposals are outside Ireland without checking Revenue guidance and obtaining Irish advice.

Overlooking Japanese inhabitant tax

Japanese local inhabitant tax is often assessed separately from national income tax and can feel delayed. If you leave Japan, the timing and collection method should be managed before departure. A clean Japan exit plan should include national income tax, inhabitant tax, and any required tax representative arrangements.

Not coordinating Irish and Japanese advisers

Cross-border RSU cases fail when each adviser sees only one side. The Japanese return preparer needs the Irish facts. The Irish adviser needs the Japan-side tax paid and income characterization. Without coordination, taxpayers risk double taxation, missed foreign tax credit claims, or inconsistent positions.

What We Do for You

Tsuji Global Tax Desk handles the Japan-side filing and tax analysis for Irish nationals, Irish founders, and Irish tech employees relocating to Japan. We focus on the Japanese income tax return, Japan-side RSU and stock option reporting, residence classification, foreign exchange treatment, and the documents needed to support the filing.

We also coordinate with your home-country adviser. For Irish clients, that may be your Irish CPA, Chartered Accountant, tax adviser, or payroll specialist handling Revenue.ie, Form 11, Irish CGT, domicile analysis, and PRSI questions. Where your wider structure involves another country, we can also work with your CPA, CA, EA, Steuerberater, or other qualified home-country professional.

Our role is not to replace your Irish adviser’s judgment on Irish domicile or Irish CGT. Our role is to make sure the Japan-side return is technically coherent and that the Irish adviser receives the Japan-side numbers, tax paid, income categories, and supporting schedule needed to assess Irish relief and reporting.

For RSU and stock option cases, we typically prepare:

Japan residence status summary
RSU vesting schedule in JPY
Stock option exercise schedule in JPY
Japan-source and non-Japan-source allocation support, where relevant
Employment income inclusion analysis
Capital gain or disposal schedule, where Japan reporting is required
Foreign tax paid summary for adviser coordination
Open issue list for Irish Form 11, CGT, domicile, and PRSI review

This E-E-A-T approach matters because cross-border equity compensation is not just data entry. It requires experience with Japanese filing mechanics, an understanding of Irish tax vocabulary, and disciplined coordination between advisers.

FAQ

For Irish nationals in Japan, are RSUs taxed when granted or when vested?

In many practical Japan assignment cases, the key tax point is vesting, not grant. If RSUs vest while you are working in Japan, the employment benefit may need to be reported in Japan. The grant date still matters because it helps determine the vesting period and any workday allocation between Ireland and Japan.

For Irish nationals who left Ireland, does Irish domicile still matter?

Yes. Irish domicile can continue to matter even after you become non-resident. Ireland distinguishes residence, ordinary residence, and domicile. Many Irish nationals retain an Irish domicile of origin unless the facts support a different domicile. This should be reviewed with an Irish adviser using Revenue guidance.

For Irish nationals selling shares after moving to Japan, can Ireland still tax the gain?

It depends on your Irish residence, ordinary residence, domicile, the asset, the timing of disposal, and treaty analysis. A post-move sale is not automatically outside Irish CGT. Keep the vesting value, sale proceeds, broker statement, and Japan tax records so your Irish adviser can assess the position.

For Irish tech employees in Japan, does sell-to-cover mean the RSU tax is finished?

Not necessarily. Sell-to-cover may satisfy a withholding process under the employer or broker plan, but it does not prove that Japanese national income tax, Japanese inhabitant tax, or Irish tax reporting is complete. You still need to reconcile the gross vesting income and any tax withheld.

For Irish nationals on assignment, should PRSI be reviewed with the RSU filing?

Yes, but as a separate workstream. PRSI and Japanese social insurance depend on the assignment structure, employer, duration, and applicable social security rules. We coordinate the tax numbers with your Irish payroll or social insurance adviser rather than treating PRSI as part of the RSU calculation.

For Irish founders in Japan, do company shares create different issues from employee RSUs?

Often yes. Founder shares, restricted shares, EMI-like arrangements, unapproved options, convertible instruments, and share-for-service arrangements can raise valuation, employment income, capital gains, and exit tax questions. The documentation is usually more important than in a standard public-company RSU case.

For Irish nationals, can the Ireland-Japan tax treaty prevent double taxation?

The treaty may help determine taxing rights and relief, but it does not remove the need to file correctly. Treaty relief usually requires consistent facts, correct income characterization, and evidence of tax paid. The treaty should be reviewed alongside Revenue guidance and Japanese filing rules.

Conversion Checklist Before You Contact Us

Before booking a paid scoping call, please prepare the documents and facts below. The more complete your file is, the faster we can identify the Japan-side filing scope and the questions your Irish adviser must answer.

1. Japan residence and assignment timeline

Prepare:

Date you arrived in Japan
Date you started working in Japan
Visa status and expected assignment length
Whether you were in Japan for less than one year, one to five years, or more than five years
Any prior Japan residence history
Dates of business trips outside Japan during the year
Date you left or expect to leave Japan, if applicable

2. Ireland tax status materials

Prepare:

Most recent Irish tax return or Revenue correspondence, if available
Your view of Irish residence and ordinary residence for the relevant year
Any Irish domicile analysis previously prepared
Whether you expect to file Form 11
Any Irish CGT filings or CGT payment records
Name and contact details of your Irish CPA, Chartered Accountant, or tax adviser

3. Employment and payroll documents

Prepare:

Japanese withholding slip, if issued
Irish payslips for the year of transfer
Japanese payslips for the year of transfer
Assignment letter, secondment agreement, or remote-work approval
Employer entity names in Ireland, Japan, and any other jurisdiction
Bonus, commission, relocation allowance, housing allowance, and tax equalisation details
Employer tax equalisation or tax protection policy, if applicable