National Tax Agency (Japan)
national taxation agency (e.g. IRS)
国税庁のサイトで調べた。
I looked it up on the National Tax Agency's website.
脱税に対する国税庁の調査だ。
This is an investigation by the National Tax Agency into tax evasion.
国税庁から税務調査の通知があった。
I received a notice from the National Tax Agency about a tax audit.