(1) Abortion could be allowed for a lady's health sake, and that too when properly suggested by some responsible specialist/physician. not allowed. (2) Under normal health conditions, and particularly when the foetus is developed enough (that specialists consider it a live body), abortion amounts to deliberate killing and therefore,
(3) Abortion or even prevention of conception for fear of economic hardships, is the negation of the basic article of Islamic faith that God is sole Provider and Sustainer of every living soul. That being the reason, the act will be un-Islamic.
"You shall not kill your children due to fear of poverty. We provide for them, as well as for you. Killing them is a gross offense"(17:31)
(4) Seeking abortion for no "good" reason at all, and saying that the "mother" or "father" just does not want that baby - is inhuman and cruel thinking. No sane person would allow that.
(5) If even the conception is the result of extra-marital union or forced rape, abortion is not allowed, because the (innocent) baby to be, has the right to life, that can not be denied. The biological parents - both or either one - or else the society/state is responsible to take care of such "un-wanted" or illegal births. not allowed.
"Losers are those who killed their children foolishly, due to their lack of knowledge, and prohibited what God has provided for them, and followed innovations attributed to God. They have gone astray, they are not guided." (6:140)
"You shall not kill any (Nafs) person - for GOD has made life sacred - except in the course of justice……."(17:33)