From the Daily Mail
Now Swedish supergroup Abba have revealed they had good reason to wear such garish stage costumes – because it saved a little money, money, money on their tax bill.
The band, whose spangly flares, catsuits and platform heels were considered naff even in the 1970s, exploited a Swedish law which meant clothes were tax deductible if their owners could prove they were not used for daily wear.
Two odd things about this story
1) I'm pretty sure that a performer wearing a lounge suit could claim it as a business expense anywhere, as long as they only used it as stage wear.
2) At the time, Abba chose to stay in Sweden paying 70-85% tax on their very high earnings rather than clearing off to live in Las Vegas or Monaco to save lots of Money, Money, Money.