Is it permissible to lie to my employer regarding my responsibility for breaking the truck's windshield in order to evade accountability?

The worker is entrusted with his employer's property and is accountable for it before Allah Almighty. He is liable for whatever he damages through transgression or negligence. The questioner did not intend to break it, but he transgressed, so he is liable, and it is not permissible for him to lie to his employer.