今年有報稅所以保險起見再確認了一下ITIN有沒有過期，IRS的Q&A裡面寫得蠻清楚的
Q1: Which ITINs are subject to expire at the end of 2020?
A1: ITINs that have not been used on a tax return for tax years 2017, 2018 or 2019 will expire December 31, 2020. Additionally, ITINs with middle digits 88 (For example: 9NN-88-NNNN) will expire December 31, 2020. Those with middle digits 90, 91, 92, 94, 95, 96, 97, 98 or 99, that were assigned before 2013 and have not already been renewed, will also expire at the end of this year.
Q2: Which ITINs will NOT expire?
A2: Any ITIN that does not have a middle digit of 88, 90, 91, 92, 94, 95, 96, 97, 98 or 99 and was used on a tax return for tax years 2017, 2018 or 2019 will not expire in 2020.
