Generally, you can't tint an entire windshield, but a tint bar that runs across the top of the windshield is allowed in some states. In California, for example, a tinted bar up to five inches is allowed at the top of a windshield.

Do all car windows have tint?

Most, if not all, new models, especially SUV's and Mini-Vans, come equipped with a dark, 15% visible light transmission “factory tint” on vehicle windows, other than the front driver and passenger windows and of course, the windshield.

Is 35 or 20 tint darker?

A 35% tint will give you more darkness, but it's still easy to see through. ... You can see through windows with a 20% tint if you're up close, but it's still difficult. Typically, it's enough to deter snoopers, though. When vehicles come with a factory tint, it's usually between 15% and 20%.