It depends on how much you drive, and what you drive. If you have a Prius and drive 2000 miles a year the emissions payoff for getting an EV would probably be longer than you’d even want to keep the car. If you’re in a diesel F350 and do 20,000 miles a year, mostly city, then yeah an EV will be net zero in like 5 years or less.

As I’m sure someone will mention inevitably, not using a car in the first place is the best option. Public transit, walking, biking, are all much better solutions.