What a waiver actually removes
An English test waiver removes the need to sit IELTS, TOEFL or a similar test for admission. It does not remove the underlying requirement, which is that the university has to be satisfied you can study in English, and in several countries the visa authority has to be separately satisfied of the same thing. A waiver is a different route to the same proof, not an exception to the standard. That distinction matters because a reader who qualifies for an admission waiver can still be asked for a language test at the visa stage, and the two decisions are made by different offices using different rules.
Prior degree taught in English
The most common waiver route is a completed qualification taught and examined in English. Universities differ on the detail: some ask for the whole degree to have been in English, some accept one year of it, and some set a recency limit. The University of Chicago's graduate school waives the test if an applicant "were enrolled for at least one full academic year in the last ten years" as a full-time, degree-seeking student at an English-medium institution in a listed set of countries, or if English has been the applicant's language of schooling since childhood, which is self-certified (grad.uchicago.edu). The University of Melbourne waives its test for an undergraduate degree, or a graduate degree of two years or more, taught and assessed entirely in English, and for a one year graduate degree only if the entry standard for that degree was itself at least IELTS Academic 6.5, with the exemption weakening the longer ago the degree was completed (study.unimelb.edu.au). The same Melbourne page states the blanket exemption does not apply to degrees from China, India, Nepal, Pakistan or Saudi Arabia specifically, whatever language they were taught in, and asks applicants from those countries for the institution's own letter confirming the whole degree was taught and assessed in English. A reader applying from a country on that kind of list needs the confirmation letter even when the degree genuinely was in English throughout.
Nationality and majority English speaking country lists
Separately from any degree, most countries also waive the requirement for nationals of a set list of majority English speaking countries. The UK Student visa lists a fixed set of countries and territories whose nationals do not need to prove knowledge of English at all, currently including Australia, Canada, Ireland, New Zealand, the USA and a number of Commonwealth and Caribbean states and territories, published on the visa page itself (gov.uk). Universities publish their own version of this list for admission purposes, and it is not always identical to the visa list. The University of Liverpool's list mirrors the UKVI list closely but adds its own extra provision for Canadian nationals with a Canadian degree, dropping the recency limit that applies to the rest of the list (liverpool.ac.uk). Always check the specific page for the country you hold a passport from or studied in, rather than assuming a university-wide list applies without exceptions.
Medium of instruction letters
Where a university accepts prior education as proof but the applicant's country is not on its blanket list, or the degree was in a country not automatically covered, the usual substitute is a medium of instruction (MOI) letter. This is a letter from the school, college or university that awarded the qualification, on its letterhead, confirming that English was the language of teaching and assessment for the whole programme, not only some courses within it. It is not the same as a transcript and not the same as the degree certificate; it is a separate, specific statement that the receiving university's admissions office or the visa authority can act on. Because it has to come from the issuing institution, it is worth requesting early. Some institutions, particularly older ones, take weeks to issue this kind of letter on request.
How to find the rule on a university's own page
The rule is rarely on the general admissions page. It is usually under a heading such as "English language requirements" inside the international students section, and the waiver conditions are often on a separate page from the minimum test scores, as with Johns Hopkins' engineering school, which publishes its own waiver eligibility page distinct from the university wide one. Search the specific school or faculty site for "English language requirement" or "IELTS waiver" rather than relying on a central admissions page, because a faculty or graduate school inside a university can set stricter or looser rules than the institution as a whole, and the country list, recency limit and minimum entry standard for a prior degree are the three details that vary most between them.
Waiver versus conditional offer
A waiver and a conditional offer solve different problems and are often confused. A waiver means the university will never ask for a test score because the prior education or nationality already satisfies the requirement. A conditional offer means the opposite: the university is not yet satisfied, and the offer becomes unconditional only once a test score at a stated level is submitted by a stated date. Applicants sometimes read a conditional offer that lists an English condition as a sign the university does not believe their prior education was in English, when it more often simply means the file did not yet contain proof in the format the admissions office needed. Submitting an MOI letter or a transcript that clearly states the language of instruction can sometimes convert the condition to a waiver after the offer has already been made.
The visa side
Passing the university's own requirement does not settle the matter for the visa. In the UK, a Student visa applicant either qualifies through nationality, through a prior degree assessed as equivalent by Ecctis, through a Secure English Language Test (SELT) from a Home Office approved provider, or the sponsoring university can assess the applicant's English itself for a degree level course, without a separate SELT (gov.uk). Below degree level, CEFR B1 is required; at degree level or above, CEFR B2. In Australia, the Department of Home Affairs sets its own minimum score for the student visa itself, currently an overall IELTS score of 6.0 with no band below 5.5 for direct entry to a course, with lower scores accepted for applicants packaged into an English course, foundation programme or pathway first (immi.homeaffairs.gov.au). This is checked by the visa office against the visa's own rules, regardless of what the university accepted for admission, so a waived or conditional offer at the university stage is never a guarantee that the visa English requirement is also satisfied.
- https://www.gov.uk/student-visa/knowledge-of-english
- https://www.liverpool.ac.uk/international/applying/entry-requirements/english-language-requirements/majority-english-speaking-countries/
- https://grad.uchicago.edu/admissions/apply/english-language-requirements/
- https://study.unimelb.edu.au/how-to-apply/english-language-requirements/graduate-english-language-requirements
- https://immi.homeaffairs.gov.au/help-support/meeting-our-requirements/english-language