耐用年数(たいようねんすう)

たいようねんすう
noun
service life; useful life; durability period
formalbusinesstime-period
1. service life; useful life; expected lifespan (of equipment or assets)
The expected number of years that equipment, buildings, or other assets can be used before needing replacement. Used both in everyday contexts and in accounting for depreciation purposes.
この機械(きかい)の耐用年数(たいようねんすう)は十(じゅう)年(ねん)だ。
This machine has a service life of ten years.
エアコンの耐用年数(たいようねんすう)を過(す)ぎたので、買(か)い替(か)えた。
The air conditioner exceeded its service life, so I replaced it.
税法(ぜいほう)で定(さだ)められた耐用年数(たいようねんすう)に基(もと)づいて減価償却(げんかしょうきゃく)を行(おこな)う。
Depreciation is calculated based on the service life defined in the tax code.

A practical term for the expected useful lifespan of equipment and assets. Composed of 耐用(たいよう) (durable use) + 年数(ねんすう) (number of years). Used in everyday conversations about appliances and in business/accounting for calculating depreciation.

Common collocations

  • 耐用年数(たいようねんすう)が過(す)ぎる: to exceed service life
  • 法定(ほうてい)耐用年数(たいようねんすう): legally mandated service life
  • 耐用年数(たいようねんすう)を超(こ)える: to surpass service life
  • 耐用年数(たいようねんすう)が長(なが)い/短(みじか)い: long/short service life

Similar words

Related Words

Compare: 寿命(じゅみょう) (lifespan)
Compare: 使用期限(しようきげん) (expiration date, use-by date)
Compare: 耐久性(たいきゅうせい) (durability)
Compare: 減価償却 (depreciation)
general
Added 2026.4.2 2:29 · Revised 2026.9.2 13:02
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