Does usted never really need to be said or can it always be implied?

Question

Ya no es bienvenido. Usted ya no es bienvenido. Do you ever actually need to say usted or is it like tú where you only rarely need it for emphasis but rarely if at all? Gracias.

Answer 1

To add a bit to usarenzo's excellent explanation, the verb you use, in your particular sentence, es, could refer to a he, she, you or it. This is why you would use Usted. Whereas any verb you would use with tú reveals the subject can only be tú because of the verb's special spelling (hables, dices, etc.)

Answer 2

The conjugation of usted is the same as for él, ella and esto, whereas for tú it is unique. So, sometimes usted is necessary to clarify the subject.

But as rarely as tú, right? - jeezzle, Jan 26, 2011

I would say yes. - gone, Jan 26, 2011