“Booster” is a term used to describe people who, despite having a regular employment (employment or self-employment) in Germany, do not earn enough money to cover their living expenses. Therefore, they receive additional financial support from the state in the form of a citizen’s allowance (formerly Hartz-IV). This supplementary assistance is also referred to as a “booster income”, as the income of the person concerned is person’s income is boosted by these additional benefits.