Translation guide
A windfall is unexpected money or gain. In Japanese, the most common equivalent is 臨時収入 (temporary/extra income). For a sudden stroke of luck, 棚からぼた餅 (a sweet treat falling from a shelf) is a classic idiom. Other expressions cover unearned luck, found money, or a lucky break.
臨時収入があった。
I got a windfall.
Money you receive unexpectedly, like a bonus, tax refund, or small inheritance.
Literally 'temporary income'. The most direct and common translation for a windfall. Used for any unexpected extra money.
今月は臨時収入があったから、ちょっと贅沢しよう。
I had some extra income this month, so let's splurge a little.
Means 'unexpected income'. A more descriptive phrase, natural in conversation.
思いがけない収入が入ったので、貯金することにした。
I received some unexpected income, so I decided to save it.
Miscellaneous income. Often used in accounting or tax contexts, not very common in daily speech.
確定申告では、雑収入として申告する必要があります。
On your tax return, you need to report it as miscellaneous income.
An unexpected lucky event that brings gain, like finding money or winning a small prize.
Idiom: 'a botamochi (sweet rice cake) falling from a shelf'. Means unexpected luck or a windfall without effort. Very common and vivid.
宝くじが当たるなんて、まさに棚からぼた餅だ。
Winning the lottery is like a windfall from heaven.
Idiom: 'grabbing millet with wet hands' (grains stick easily). Means easy profit or gain without effort. Slightly old-fashioned but still understood.
Abbreviation of 棚からぼた餅. Casual, slangy. Used among friends.
Money you find or receive from an unknown source, like a forgotten bank account.
Literally 'something picked up'. Can mean a found item or a lucky find, including money.
道で一万円を拾った。こんな拾い物は初めてだ。
I found 10,000 yen on the street. I've never had a find like this.
Forgotten assets. Used in financial contexts for dormant accounts or unclaimed property.
忘れられた資産が見つかって、臨時収入になった。
I found some forgotten assets, which turned into a windfall.
Receiving money or property from a relative or friend unexpectedly.
Unexpected inheritance. Natural phrase for a windfall from a will.
遠い親戚から思わぬ遺産が転がり込んだ。
An unexpected inheritance came in from a distant relative.
Unexpected gift. Can refer to a large monetary gift.
祖父から思いがけない贈り物をもらった。
I received an unexpected gift from my grandfather.
A fortunate turn of events that brings advantage, like a job offer or a chance encounter.
Good luck, fortune. Broad term for a lucky break. Can be used for non-monetary windfalls.
あの会社から突然オファーが来るなんて、本当に幸運だった。
Getting a sudden offer from that company was a real windfall.
To be lucky (literally 'luck is attached'). Casual way to say you're having a lucky streak.
今週は本当についてる。毎日いいことがある。
I'm really lucky this week. Good things happen every day.
臨時収入 is a neutral, factual term for extra income. 棚からぼた餅 is an idiomatic expression that emphasizes the luck and unexpectedness, often with a nuance of 'without effort'. Use 臨時収入 in formal contexts; 棚からぼた餅 is more colorful and casual.
English 'windfall' originally meant fruit blown down by wind. Japanese has no direct equivalent. Avoid literal translations like 風で落ちた果物. Use the expressions above depending on context.
税金の還付は嬉しい臨時収入だった。
The tax refund was a nice windfall.
彼は叔父が亡くなって、思わぬ遺産が転がり込んだ。
He came into a windfall when his uncle died.
あの投資話は濡れ手で粟のようだ。
That investment deal sounds like easy money.
臨時ボーナスが出たよ。たなぼただね。
I got an unexpected bonus. What a windfall!