Will your ITIN number expire if you haven’t used it? Here’s the quick answer: Some time ago, the IRS announced that ITINs that have not been used on a federal tax return in at least one of the prior three years will expire. Similarly, ITINs assigned before 2013 would also expire on an annual schedule. The first round of expirations became effective on the last day of 2016. The good news is that, if your ITIN number expires, you can apply for a renewal in good time to file your tax return. Contact us for help.