New changes to Australia's General Skilled Migration (GSM) programme came into force Saturday that would impact international students most, Australian Minister for Immigration and Citizenship Kevin Andrews announced.

The reforms were announced in April jointly by Andrews and Australian Minister for Education, Science and Training Julie Bishop.

Under the changes, requirements for applicants with skills in professional, technical or managerial occupations will be raised from an International English Language Testing System (IELTS) score of 5 (vocational) to 6 (competent).

Applicants with recognised trade skills applying for GSM will be required to meet the current threshold of IELTS 5.

Andrews said the changes would have the greatest impact on international students, many of whom seek residency and work in Australia after studying at universities here.

"Students wishing to apply for a GSM visa will now be required to have a stronger understanding of the English language and undertake relevant work experience," Andrews said in a statement.

He said visa applicants with advanced Australian university qualifications, skilled work experience and strong English language skills would gain extra points towards being granted residency.

"The changes would lead to better labour market outcomes for all General Skilled Migration applicants and help deliver the skills Australian employers need," Andrews said.