The employee can make an 83b election upon grant, pay for the stock up front, and not get hit with a tax bill upon vest.
If the company is public (either via acquisition or IPO), the company will sell part of your vested stock to cover taxes.
If the company is public (either via acquisition or IPO), the company will sell part of your vested stock to cover taxes.
More likely, the company might give away shares to an employee in lieu of salary, but then the employee has to pay taxes on the value.
In other words, there's no way to obtain stock in a private company without facing some kind of expense. You're either paying money directly for shares, or paying taxes on the gift of shares.
The only way to avoid any of this is:
1) Be there at the very beginning, when shares have negligible value and can be bought easily. OR 2) Be granted stock options instead of real stock.