Form W-2 is one of the most crucial documents at the tax time, which states the wages you earned and the taxes you paid. It is mandatory for every employer to fill out this form. They can also refer W-2 Form as an output document received from employer’s end, summarizing employee’s total Gross Earnings, Social Security Earnings and Medicare Earnings. Filling out a W-2 form is more like a ritual in the USA that every employer needs to follow. The basic purpose of this form is to provide all the information to employees that need to be included in their income tax form.Almost every employer needs to fill out this form for their employees and send it to the SSA and then, to the IRS. Employees can file the return and get their refund only after the verification from IRS. Every employer should mail the verified form from SSA to IRS latest by 31st January. Read this blog to learn more.