Stock Options and RSUs Tax in Korea for Foreign Employees

Who this guide is for

• Foreign employees of multinational companies in Korea
• Employees transferred into or out of Korea during a vesting period
• Workers receiving stock options, RSUs, or other share awards
• Payroll and mobility teams supporting foreign employees

Key points

• Grant, vesting, exercise, settlement, and sale are different events.
• The employer's country and the stock market do not alone determine Korean tax.
• Work location during the award's service period can affect source allocation.
• Payroll withholding and personal filing should be reconciled.
• The share value used for employment income can become important cost-basis evidence for a later sale.

Step-by-step explanation

Build one grant-to-sale timeline

For every award, list the grant date, vesting conditions, vesting date, exercise date if relevant, share delivery date, value used by payroll, sale date, and cash received. Attach the plan documents and brokerage confirmation to the same line item. This prevents option, RSU, and sale events from being mixed together.

Identify the employment service period

An employee who moved countries during vesting should prepare a work-location calendar rather than allocating the award only by residence on the settlement date. Record Korea workdays, overseas workdays, assignment terms, and any leave or business travel that may affect the calculation.

Reconcile payroll and personal reporting

Ask the Korean employer whether the equity amount was included in payroll, the year-end settlement, or a withholding receipt. Also ask the foreign parent what value and date it used. Differences do not automatically mean one record is wrong, but they must be explained before a return is filed.

Preserve value and exchange-rate evidence

Keep the quoted share price, currency, exchange rate, and time zone used for the taxable event. When shares are later sold, the same records help establish basis and prevent the employment-income amount from being taxed again as part of the gain.

Review treaty and credit relief

If another country taxed the same award, do not simply deduct the foreign tax from Korean tax. Confirm source allocation, treaty position, credit limits, currency conversion, and proof of final foreign tax paid.

Documents you may need

• Plan rules and award agreement
• Grant, vesting, exercise, settlement, and sale confirmations
• Fair-market-value statements
• Exercise price and brokerage records
• Korean and foreign payroll statements
• Travel and workday calendar
• Foreign tax returns and tax-payment evidence

Common mistakes

• Reporting only when cash reaches a bank account
• Treating every equity award as taxable on the same date
• Ignoring work performed in Korea during a foreign plan's vesting period
• Paying tax through payroll but omitting the award from later reconciliation
• Using sale proceeds as the entire capital gain without checking basis

When should you ask a tax professional?

Ask a qualified tax professional if you have income from several countries, business income, unclear tax residency, treaty questions, missing documents, late filing concerns, or a visa situation that depends on tax records. This site explains general patterns only and cannot review your personal facts.

FAQ