The Subjunctivisor!
Does tal vez require the subjunctive?
Tal vez may require the subjunctive, depending on the certainty and reality of the subordinate clause:
Por ejemplo …
Como hubo un accidente en la autopista, tal vez llega tarde.
As there was an accident on the freeway, it is possible he will be late. (strong possibility)Tal vez sea posible de encontrar una solución, pero lo dudo.
Perhaps there is another solution, but I doubt it. (very little possibility)