Welcome to the forum, Prima.
Neither sentence works, because we can't talk of there being enough budget. I am not sure exactly what you do want to say, because a car company is unlikely to announce that its introduction of a new model depends on having enough money.
If we are talking about a future real possibility, the verb in the if- clause is in a present tense:
I will buy a new car next month if I have enough money.
Student or Learner