My wife and I are members of a medical aid. I am the main member and she is a dependent. The cost of the monthly contributions are partly paid by my employer and partly by myself.
My wife however pays me monthly for our portion of the medical aid monthly expense after it has been deducted from my salary because she earns more than me, but doesn't receive a medical aid option from her work.
My wife also had out of pocket medical expenses amounting to R4 100. In assisting her with her tax return, if we insert her out of pocket medical expenses (source code 4020), the return calculator says a return of zero. If I input the amount she pays me monthly for medical aid contributions into source code 4040, she gets a return from SARS.
You cannot include the portions she pays you as the medical aid is in your name, it does not make a difference who earns more as you will still be entitled to the same credit for medical aid contributions.