The Internal Revenue Service today announced important changes to help taxpayers comply with revisions to the Individual Taxpayer Identification Number (ITIN) program made under a new law. The changes require some taxpayers to renew their ITINs beginning in October.

The new law will mean ITINs that have not been used on a federal tax return at least once in the last three years will no longer be valid for use on a tax return unless renewed by the taxpayer. In addition, ITINs issued prior to 2013 that have been used on a federal tax return in the last three years will need to be renewed starting this fall, and the IRS is putting in place a rolling renewal schedule, described below, to assist taxpayers.

If taxpayers have an expired ITIN and don’t renew before filing a tax return next year, they could face a refund delay and may be ineligible for certain tax credits, such as the Child Tax Credit and the American Opportunity Tax Credit, until the ITIN is renewed.

“The ITIN program is critical to allow millions of people to meet their tax obligations,” said IRS Commissioner John Koskinen. “The IRS will be taking steps to help taxpayers with these changes, and we’re designing this effort to minimize the burden as much as possible. We will be working with partner groups on an outreach effort to share information about these changes to ensure people understand what they need to do in advance of next year’s tax season.”

The ITIN changes are required by the Protecting Americans from Tax Hikes (PATH) Act enacted by Congress in December 2015.

IRS Works to Help Taxpayers Affected by ITIN Changes; Renewals Begin in Octobe