cliff edge - definition and synonyms

noun
  1.   From our crowdsourced Open Dictionary
    in taxation, a situation where a small increase in income leads to a large loss of benefits or increase in taxes due

    To remove the “cliff-edge” in the original policy, Mr Osborne said child benefit would be withdrawn gradually from those earning between £50,000 and £60,000.

    Submitted from United Kingdom on 20/04/2012