It is always a requirement that needs to be dealt with by each and every individual when it comes to him making sure that he has handle his tax issues is taken care and everything that the government needs from him is handle.
When there is a change or an employee has some clarification that he wants to see done when it comes to him and the amount of tax that he is paying to the government they are able to look at the W-4 form that they signed earlier on the initial time of employment and if need be they are able to get a new form that they get to sign when they employee has an increase in his amount that he is being paid as salary, this is done to make sure that there is consistency and transparency when it comes to tax payment.
As a freelance earner you can and never over look this process that is why you get to have 1099-MISC fee that you are supposed to fill and pay through so that you can avoid the federal police coming after you, this also include those of us who are self employed as we are not exempted from paying taxes to the government as this is their directive to us so that we can get to enjoy services from them and have our lives better