Tariff points should be phased out by the Universities and Colleges Admissions Service, a Ucas review unveiled on 9 February recommends.
It calls for their “gradual withdrawal” when setting entry requirements and making offers.
Instead, it proposes, all higher education offers should be grade-based.
Many universities have already stopped using the Ucas tariff-point system, which compares A levels with about 1,400 level-3 qualifications, including the IB.
A consultation is under way until 16 April, with a decision on the plans expected in June.