I read this novel at least 40 years ago. It is clearly SF, some of the action is not on Earth. I don’t remember interstellar travel, only within solar system, Moon and/or Mars and/or Venus and/or asteroids. So space colonisation is there, but in fact is a minor ingredient : if those parts of the action had been on some remote corner on Earth, it would not have changed the plot much, really.
What I remember best is some "sociological" aspects. There seem to be no countries, no polities. Big companies rule the world (the worlds, rather, since there are several inhabited planets/satellites). Even law and order are maintained by private security agencies. I think I remember Brink’s being mentioned.
The main protagonist works for one such big company. He has no decision power, but has the ear of the CEO of that company, who trusts him. Of course, some people are not happy with that.
So one morning the main protagonist wakes up, probably not on Earth, as an indentured worker (translate : a slave) and is shown a contract he is supposed to have signed to pay back some huge debt he has no memory of owing. And since his expenses are higher than his salary, he’ll never pay it back. I don’t remember how he does it, but he manages to escape, without killing anyone. However he is now wanted by the authorities-that-be for contract breach and “femicide”.
At some point he gets in touch with, either the CEO he worked for, or some person really loyal to the latter. In any case, this person does not blink an eye at the charge of femicide, but asks him whether the contract that was breached really was invalid. (It is not clear where, in this hierarchy of severity, homicide would find its position.)
At his assurance that the contract was totally phoney, he obtains help, but there are still more happenings that I forgot.
In the end, the CEO dies and the main protagonist is told by a inheritance lawyer that the CEO has willed him a majority of shares of some obscure sub-company. But by some complicated mechanisms, this puts him in control of the entire big company of which he becomes the CEO.