Your employer is responsible for collecting the correct amount of Social Security and Medicare taxes.
Your employer is also responsible for withholding the amount that should be withheld based on the W-4 form that you filled out and gave him. You control the amount to be withheld based on what you put down on the W-4 form. This is rarely, if ever, the actual amount of tax you owe. If the withholding is not enough to cover the taxes you owe or if the employer fails to withhold taxes, you are still responsible for paying them directly to the government.
Taxing wages would have to be wages that you have worked for and earned by providing services for an employer.
Your employer is not taxing your retention bonus. Your employer is following the IRS rules that say your bonus is earned income, and as such, it is taxed just like other earned income.
He was responsible for taxing the colonists, and for the Stamp Act.
I'm unsure of your question. If you mean who was responsible for taxing the American colonists and refused to listen to their cries. It was both King George III and the British Parliament.
If the employee built the item under the direction of the employer, using the employer's plans or specifications, the employer will be responsible. If the employee did not follow the directions of the employer, particularly if it strayed from the standards of a normal build, then the employee could be held responsible.
The employees and service users
Generally the employer is responsible.
the employer
no
Assuming you are talking about your employer's health plan post termination, the employer has that responsibility.
You aren't responsible for them overpaying you, but you are responsible for paying back whatever you were overpaid.
Your employer is responsible for any over payment of wages. You will need to contact your payroll department to get the problem resolved.