Question: I am an employee at a bank, so is it permissible for me to perform Hajj from my earnings?
Response: Working in a bank which deals with ribaa is not permissible.
This is because it is assisting in sin and evil. And also, the Prophet (sal-Allaahu `alayhe wa sallam) cursed the one who ate/benefitted (aakil) from ribaa, as well as the one responsible (for the transactions), the witnesses (to the transactions) and the one who writes (the transactions).
Therefore, the employee in reality is assisting the bank, even if he is just a (bank) clerk. So he is cursed according to the text of the hadeeth. Based upon this, the wage he earns is haraam, and it is not permissible for him to eat/benefit from it and nor to perform Hajj with it. This is because the (performance of) Hajj requires pure/good earnings from halaal (sources), however, if he has (already) performed Hajj, then his Hajj is correct/sound but with sin (attached to it, i.e. lesser in reward).
Shaykh Ibn Fowzaan
al-Muntaqaa min Fataawa Fadheelatush-Shaykh Saalih Ibn Fowzaan – Volume 4, Page121, Fatwa No.123 fatwaonline.com