What is the difference between W2 and W4(US Tax terms)?
A W-4 is the form you fill out and give to your employer instructing them on how much money to withhold from your pay for your income tax liability at the end of the year. A W-2 is the form your employer gives you and the IRS telling you how much you made and how much has been withheld for federal, state and local taxes as well as how much you paid in FICA and Medicare taxes.
