Contrastive focus (lo faccio io)

In Italian, subject pronouns (like io or tu) are usually dropped. However, to emphasize who is performing an action—especially to contrast it with what someone else is doing—you must include the pronoun and place it after the verb.

I'll organize the stall, but you write the sign.
Il banchetto lo organizzo io, ma il cartello lo scrivi tu.
Anna is kneading, but I'll put everything in the oven.
Anna impasta, ma inforno tutto io.

This post-verbal placement applies to names as well. If you need to clarify exactly who completed a task or correct a misunderstanding, the name goes after the verb.

Did you write something nice on the sign? No, Luca wrote it.
Hai scritto tu qualcosa di bello sul cartello? No, l'ha scritto Luca.

Answering "Chi?" (Who?)

When answering a question that asks chi (who), the person's identity is the most important piece of new information. Emphasized information naturally lands at the end of an Italian sentence.

Who is making the tart? I am making it.
Chi fa la crostata? La faccio io.
Who is putting the tart in the oven? Marco is putting it in.
Chi inforna la crostata? La inforna Marco.

You can use this structure to claim any task, like managing the proceeds (il ricavato) or acting as the cashier (il cassiere).

I'll be the cashier, so I'll take care of the proceeds.
Il cassiere lo faccio io, quindi mi occupo io del ricavato.
Did you count the proceeds? No, Marco counted them.
L'hai contato tu il ricavato? No, l'ha contato Marco.