If you are looking to switch into the same sex partner visa, you may do so either under the old or new rules. The old rules will allow if you applied to switch before the 9th of July 2012. In that case, you will not need to meet the financial requirement of earning a minimum gross income of £18,600 per year.
The new rules on switching are enshrined in Part 8 of the Immigration Rules under Appendix FM. Based on the new rules, persons looking to switch into this route, will need to meet the financial requirement of earning gross income of £18,600 per annum.Long Residence and PBS Dependants
Where the PBS dependant migrant has become a settled person in the UK on the basis of long residence, the dependant migrant will be unable to extend their current leave or obtain ILR under their current route. The will have to switch to the same sex partner of a settled person.
Importantly, if you have been granted leave to remain prior to the 9th of July 2012, you can apply for further leave under the transitional provisions at A280 (C) under the Part 8 Immigration Rules. If you were granted leave after the 9th of July 2012 and your partner have obtained indefinite leave to remain your will be able to extend your leave under Appendix FM.