noun
tax identification number; TIN
Official term for a taxpayer identification number, used in tax administration and legal contexts.
確定申告には納税者証明番号が必要です。
A tax identification number is required for filing a tax return.
マイナンバー is the Japanese social security and tax number system for individuals, while 納税者証明番号 is a more generic term for a taxpayer ID, often used in international or business contexts.
Compound of 納税者 (taxpayer) + 証明 (certification) + 番号 (number). A straightforward modern technical term.