More than 1 million ITINs expire Dec. 31, and renewing your ITIN promptly by filing a Form W-7 will help you avoid delays and get your tax refund more quickly and efficiently. If you're confused ...

Before reading this guide, it may be helpful to read the guides on indices from Module 6 and Module 7. To convert a number into standard form, split the number into two parts - a number multiplied ...