Mae’r OS hwn yn darparu nad yw’r adrannau perthnasol o Ddeddf 2016 sy’n ymwneud ag amrywio rhent, sy’n gymwys i gontractau diogel neu gontractau safonol cyfnodol, yn ddarpariaethau sylfaenol o gontractau meddiannaeth sy’n denantiaethau cymdeithasau tai (o fewn yr ystyr a roddir i “housing association tenancy” yn Rhan 6 o Ddeddf Rhent 1977 (“Deddf 1977”)).
This SI provides that the relevant sections of the 2016 Act dealing with the variation of rent applicable to secure and periodic standard contracts are not fundamental provisions of occupation contracts that are  housing association tenancies (within the meaning in Part 6 of the Rent Act 1977 (“the 1977 Act”)).