When Does 'Dès Que' Require the Subjunctive?

The French term dès que is a conjunction that means "as soon as." Dès que does not take the subjunctive.

Je l'achèterai dès qu'il arrivera.
I'll buy it as soon as he arrives.

Je te donnerais le livre dès que je le finirai.
I'll give you the book as soon as I finish it.

As you can see in the examples above, this conjunction is normally followed by the ​future tense, rather than the present tense.​