This could be a little out of date now... :-/

General Skills Category
 
G6.5 Minimum standard of English
 
a.  Principal applicants and spouses, partners and dependent children included in an application under the General Skills category meet the minimum standard of English if:
 

    i    they provide a certificate (no more than 2 years old at the time the application is lodged from the International English Language Testing System (IELTS), which shows a minimum band score of 5 on EACH of the 4 components of the IELTS General or Academic Module, OR
 
   ii    they provide evidence that they have an English-speaking background (see G6.5.1) which is accepted by a visa or immigration officer as meeting the minimum standard of English; OR
 
    iii   they provide other evidence which satisfies a visa or immigration officer that, taking account of that evidence and all the circumstances of the application, the person meets the minimum standard of English.  These circumstances may include but are not limited to:
the country in which the applicant currently resides;
the country(ies) in which the applicant has previously resided;
the duration of residence in each country;
whether the applicant speaks any language other than English;
whether members of the applicant's family speak English;
whether members of the applicant's family speak any language other any English;
the nature of the applicant's current or previous employment (if any) and whether that is or was likely to require skill in English Language;
the nature of the applicant's qualification (if any) and whether the obtaining of those qualifications was likely to require skill in English language.
 

b.    In any case under (a) (ii) or (iii), a visa or immigration officer may require an application to provide an IELTS certificate in terms of paragraph (a)(i).  In such cases, the IELTS certificate will be used to determine whether the applicant meets the minimum standard of English.

 

 
Business Immigration Categories
 
i.  they provide a certificate (no more than 2 years old at the time the application is lodged*) from the International English Language Testing System (IELTS), which shows a minimum band score of 4 on each of the 4 components of the IELTS General or Academic Module.
 

These provisions retain the effective date of 1.4.01.