Question

Suppose you have been employed for about a year and a half and have been offered a better job at a different employer. Assuming you have been taking advantage of the matching 401k plan, what will happen to your 401k if you leave your current job before you are fully vested?

Answer 1

It all depends on the plan document. The plan document will state the waiting period, which can be a year, a vesting schedule, and your rights.

So more information is needed to answer your question. I can say with reasonable assurance you will be entitled to 100% of the money you put directly into the plan. The waiting period and vesting schedule will decide how much you are entitled to of the employers money.