If you are providing an employer or your retirement fund a W-4 it will be for the year 2018. The W-4 for 2018 has not been released for 2018 by the IRS. See this IRS website - <a rel="nofollow" target="_blank" href="
https://www.irs.gov/newsroom/irs-statement-withholding-for-2018">https://www.irs.gov/newsroom/irs-st...>
