Your ITIN may expire before you file a tax return in 2019. All ITINs not used on a federal tax return at least once in the last three years will expire on December 31, 2018. Additionally, all ITINs issued before 2013 with middle digits of 73, 74, 75, 76, 77, 81, or 82 (Example: (9XX-73-XXXX) will also expire at the end of the year.
If you need to file a tax return in 2019, IRS recommends you submit a Form W-7, Application for IRS Individual Taxpayer Identification Number, or Form W-7(SP)