WHEN SHOULD I APPLY FOR AN ITIN

You should apply for an ITIN as soon as you’re ready to file your federal income tax return, since you need to attach the tax return to your application. You can apply for an ITIN any time during the year. If the tax return you attach to Form W-7 is filed after the tax return’s due date, you may owe interest and/or penalties. You should file your current year tax return by the prescribed due date to avoid this.