Family Income Supplement was a means-tested benefit for working people with children introduced in Britain in 1970 by the Conservative government of Edward Heath, effective from August 1971. It was not intended to be a permanent feature of the social security system and was abolished by the Social Security Act 1986, which replaced it with Family Credit. Once entitlement was established, it continued for 52 weeks regardless of changes in circumstances. The take-up of the benefit was initially poor, with less than half of those eligible claiming.