If you are planning to immigrate to an English speaking country, you need to secure decent bands in an IELTS test. IELTS score for Australia PR status varies according to the visa you apply for. There is no IELTS needed for family visas. Family visas do not ask you for English Language requirements and hence you do not need to present an IELTS score.
IELTS Score for Australia Work Visa
Skilled workers who want to migrate to Australia on Skilled Independent Visa or Visa Subclass 189 or Skilled Nominated visa or Visa Subclass 190 need at least an IELTS score of 6 in each of the four test modules.