The integrity provision of the PATH Act that will have the greatest impact on taxpayers that claim EITC is the one that requires the IRS to not release refunds for returns that claim EITC or the Additional Child Tax Credit until February 15 beginning with the 2017 filing season. Therefore, any return claiming the EITC or CTC credits that is prepared in the early part of the filing season will not be released for up to 4 weeks (depending on when the return is filed) instead of the standard 21 days or less timeframe.