How selective are you allowed to be with tenants?

[Bellman Tumasang]

I know when screening tenants you can’t choose based on race, gender, disability etc. Can you choose based on income and job? Are these legal discrimination because you can argue some are more secure and nearer etc? For example, I’m not sure if your allowed to do this but could you be choosing key workers over non key workers as key workers may still be working and able to afford rent?