After 漫步人生路 in 1983, Teresa began a plan to own her new recordings, no longer owned by the record companies. There seems to be a transition process and I think this process was completed from 1985 onwards.
So, all the music released by Polygram, Taurus, Himalayas, B&W etc after 1985 were all licensed from TNT (Teresa's own production company). This is not a secret. TNT was credited at the back of the Taurus CDs after 1985 (or 1986, can't remember).
However, I am sure Taurus still paid Teresa royalties. This is confirmed by the boss of Taurus. But how many percent I really don't know. Also, I know nothing about Teresa's royalty payment before 1983 by Polygram/Polydor KK.