Taigan (対岸) — the far shore
Plain-English guides and small, private tools for Americans and other English-speaking residents of Japan. Guides cite primary sources and show when they were last verified; tools run entirely in your browser and your data stays on your machine.
The first cornerstone guide is published: who has to file FinCEN Form 114, which Japanese accounts count, how to read a 通帳 for the year's peak balance, the Treasury year-end rate, spouse and family rules, and what to do if you're years behind. Verified against eleven primary sources, June 2026.
Read the revised guide: FBAR for US Persons in Japan →First version of the site: the guide framework (every guide will cite primary sources and carry a last-verified date), the tools index, and this updates feed. The first batch of money guides — FBAR, US taxes from Japan, nenkin and Social Security, and more — is drafting now.
The flagship planning tool's hosted demo (v1.0.2) now lives at /tools/taigan-bridge/. It opens pre-loaded with a sample household so you can explore all sixteen modules without entering anything. For your real data, use the download link in the demo banner and open the single HTML file locally — your records stay on your own machine.
Financial, tax, estate, and health planning for Americans on the opposite shore.
Track FinCEN 114 filings year by year, with Treasury rates built in.
Hometown tax, with the US-person angle accounted for.
Project your Japanese pension from your record.
Understand every line of a Japanese payslip.
Who has to file FinCEN Form 114, which Japanese accounts count, and how to work out your maximum account values — with the official sources.
How the Japanese pension system and US Social Security fit together — the totalization agreement, vesting in both systems, and drawing both in retirement.
Line by line through a Japanese payslip: what each earning and deduction is, where the money goes, and what's worth double-checking.