poverty threshold(The poverty threshold, poverty limit or poverty line is the minimum level of income deemed adequate in a particular country Bullfinch)
poverty level(В данном случае "уровень бедности" – ложный друг переводчика (правильно: poverty rate): The unemployment rate for blacks in St. Louis County in 2012 was more than 10 percentage points higher than that of whites; more than one in five black residents lived below the poverty level. // The government's definition of poverty is based on total income received. For example, the poverty level for 2014 was set at $23,850 (total yearly income) for a family of four.4uzhoj)
subsistence level(subsistence level The minimum level of consumption on which people can survive. This is an ambigous concept: does it refer to the level of consumption needed for an individual to survive for some limited period, such as a year, or the level needed for the expectation of life normal in a given society? In any case subsistence level is well below what is regarded as a poverty line in modern societies. OxfordEconomics Alexander Demidov)