Yes it does add up. You have to remember the stupid people did exactly the same thing years ago with the Social Security tax. The tax withholding was out of hand and visible to the voting public so they "hid" 1/2 of it by reducing the actual witholding from the paycheck and forced the employeer to pay the other half. The stupid "sheeple" had been sedated even though they didn't realize that the money the employer was forced to pay was in fact, money directly out of their pockets.
The only fair tax is a tax on retail sales with no exceptions to the tax. Other than that, it can be manipulated by politicos and will quickly become the exact copy of our IRS fiasco we now have.
I appreciate your support, but it does not add up. Never did.