Depends on the nature of your business and how it is structured.If you own an LLC taxed as a passthrough entity, then you probably will check option b and submit the W7 along with your US non-resident tax return. If your LLCu2019s income is not subject to US tax, then you will check option a.If the business is a C Corp, then you probably donu2019t need an ITIN, unless you are receiving taxable compensation from the corporation and then we are back to option b.