You are wrong in your assertions.
First, Box 14 on the W-2 is, in the main, only a "memo" box. It's a box where the employer provides some additional information to the employee about what the employee is seeing on the W-2. Generally entering Box 14 information, or not, does not affect your income tax return.
Second, Box 14 in this case should be reporting the compensation created by the vesting of the RSU, not the taxes withheld.
Third, your employer almost certainly did not pay the "employee" portion of any taxes withheld. Almost certainly "you" paid those taxes and "you" paid those taxes by selling some of the stock you received. The cash raised by the sale of stock "for taxes" gets passed back to your employer, who pays the government(s), and those payments are included on the various "taxes" boxes of the W-2, though these amounts are typically not separately reported to you in Box 14.
IF you somehow think that these taxes need to be reported again somewhere in your income tax return, (which you can't do), because your tax liability increases dramatically when you enter the sale of the stocks "for taxes" in your income tax return THEN your problem is that you are using the wrong basis in reporting the sale. The correct basis is not the $0 the broker is almost certainly reporting on the 1099-B, the correct per share basis is the same as the per share "fair market value" used by your employer in calculating the compensation created by the vesting.
Tom Young
