If you are a U.S. tax resident, gains and losses from Japanese stock sales generally must be included in your U.S. income tax return.
Selling through a Japanese account without transferring the proceeds to the United States does not remove the requirement. Japanese withholding does not replace U.S. reporting.
Reference: IRS — Taxation of U.S. Residents
1. Calculate Gains and Losses Under U.S. Rules
For ordinary investment stocks, compare sale proceeds with the adjusted U.S. tax basis. Review fees and adjustments such as stock splits.
Gains and losses are generally long-term when the holding period exceeds one year and short-term otherwise. Different tax treatment may apply.
Gifted or inherited shares require special consideration of basis and holding periods.
Reference: IRS — Capital Gains and Losses
2. Calculate in U.S. Dollars
Generally, acquisition cost and sale proceeds are translated separately using the applicable transaction-date exchange rates.
Currency movements can produce a dollar loss despite a yen profit, or vice versa. Review acquisition records rather than relying solely on the yen gain shown on a Japanese annual statement.
Reference: IRS — Foreign Currency and Exchange Rates
3. Report on Form 8949 and Schedule D
Ordinary stock sales are generally reported on Form 8949 and Schedule D, using acquisition and sale dates, proceeds, basis, and required adjustments.
The absence of a U.S. Form 1099-B from your Japanese broker does not eliminate reporting.
Reference: IRS — Instructions for Form 8949
4. Review Japanese Taxes
Foreign tax credits or other provisions may address double taxation, but Japanese taxes may not be creditable in full.
Income sourcing, residence, treaty provisions, and credit limitations matter. Japanese stocks do not automatically produce foreign-source gains.
Reference: IRS — Publication 514
5. Review Account Reporting Separately
Your Japanese brokerage account may require FBAR or Form 8938 reporting. A low year-end balance after selling does not necessarily remove obligations based on values during the year.
Reference: IRS — Comparison of Form 8938 and FBAR Requirements
Records to Gather
- Stock names, quantities, acquisition dates, and costs
- Sale dates, proceeds, and fees
- Annual statements and transaction records
- Stock splits, gifts, and inheritances
- Japanese taxes withheld or paid
- U.S. arrival and departure dates and prior filings
We review residency and transactions to identify the necessary calculations and reporting. Please provide only an overview initially; we will explain how to share confidential records separately.
This answer concerns ordinary investment stocks held by individuals. Nonresident and part-year situations, investment funds, and stock options may require different treatment. State taxes need separate review.
Information reviewed: October 14, 2026
