The IRS recommends to apply for a renewal if your ITIN has expired or will expire before you file taxes in 2019 in order to prevent potential delays. If you file your taxes with an expired ITIN, then you may experience significant delays for your tax return.We Offer Free ITIN Consultations. If you’re still unsure about the ITIN process and regulations, stop by our Tax Now 1 office and we’ll be glad to walk you through the process. Don’t deal with the extensive tax laws alone. Our experienced accountants can help make tax laws work for you, not against you.