Birth control is allowed in Islam as long as they [the methods] are not permanent. That is, the method employed is reversible, and the woman may be able to get pregnant again if she stops the birth control method. Hence, contraceptives are allowed in Islam since they are not permanent. [But] a couple must not feel that the presence of a child may jeopardise one's financial stability. [Not having children because of fear of financial instability is forbidden because it shows lack of trust in God.]
This response was provided by Talha Rizvi Barq.