My company awarded me restricted stock units (RSU) few years ago which will vest December 1, 2015 and get converted to shares. Since vesting is a taxable event, the total share value in U.S dollars will be reported to IRS and taxes withheld. I have already certified and submitted tax form W-9. I have opted to reinvest dividends to buy new shares. So in 2015, I will neither be receiving dividends nor selling the shares. Do I still have to report anything to IRS when filing tax returns next year? Will I get any form from IRS for filing returns?

You will be receiving dividends, you are just reinvesting them. I do this on all my stocks but get 1099 DIV's each year. Goes on the 1040.

RSUs are different than dividends. They are normally considered part of the recipient's compensation package, and should be taxed on vesting under the W-2.

If the resulting stock is not sold, no other reporting to the IRS is required. The basis is the price at vesting.

Thanks for the clarification.

Glad to help!